Entity Framework 7 http://blogs.ugidotnet.org/PietroLibroBlog/category/Entity Framework 7.aspx Entity Framework 7 it-IT Pietro Libro pietro.libro@libero.it Subtext Version 2.6.0.0 Documentazione EF 7 (Beta 5) http://blogs.ugidotnet.org/PietroLibroBlog/archive/2015/07/22/documentazione-ef-7-beta-5.aspx Documentazione "Work in Progress" della prossima release di Entity Framework : <a href="http://ef.readthedocs.org/en/latest/" target="_blank">http://ef.readthedocs.org/en/latest/</a><img src="http://blogs.ugidotnet.org/PietroLibroBlog/aggbug/102030.aspx" width="1" height="1" /> Pietro Libro http://blogs.ugidotnet.org/PietroLibroBlog/archive/2015/07/22/documentazione-ef-7-beta-5.aspx Wed, 22 Jul 2015 09:07:28 GMT http://blogs.ugidotnet.org/PietroLibroBlog/archive/2015/07/22/documentazione-ef-7-beta-5.aspx#feedback http://blogs.ugidotnet.org/PietroLibroBlog/comments/commentRss/102030.aspx http://blogs.ugidotnet.org/PietroLibroBlog/services/trackbacks/102030.aspx ASP.NET 5 e AzureTableStorage http://blogs.ugidotnet.org/PietroLibroBlog/archive/2014/11/30/asp.net-5-e-azuretablestorage.aspx <p>Riprendiamo l’esempio del post <a href="http://blogs.ugidotnet.org/PietroLibroBlog/archive/2014/11/30/asp.net-5-e-entity-framework-7-beta.aspx" target="_blank">precedente</a> per testare l’integrazione tra EF7 e lo storage di Azure. Apriamo NuGet ed installiamo il package “EntityFramework.AzureTableStorage” (sempre in beta):</p> <p><a href="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/ASP.NET-5-e-AzureTableStorage_12A85/image_2.png"><img title="image" style="border-top: 0px; border-right: 0px; background-image: none; border-bottom: 0px; padding-top: 0px; padding-left: 0px; margin: 0px; border-left: 0px; display: inline; padding-right: 0px" border="0" alt="image" src="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/ASP.NET-5-e-AzureTableStorage_12A85/image_thumb.png" width="244" height="65" /></a></p> <p>Modifichiamo il codice della classe <em>ItemDB</em> in questo modo:</p> <p> </p><div id="scid:9D7513F9-C04C-4721-824A-2B34F0212519:68787369-7880-4ef3-a7a0-14d1d7b508da" class="wlWriterEditableSmartContent" style="float: none; padding-bottom: 0px; padding-top: 0px; padding-left: 0px; margin: 0px; display: inline; padding-right: 0px"><pre style=" width: 754px; height: 279px;background-color:White;white-space:-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; white-space: pre-wrap; word-wrap: break-word;overflow: auto;"><div><!-- Code highlighting produced by Actipro CodeHighlighter (freeware) http://www.CodeHighlighter.com/ --><span style="color: #008080;"> 1</span> <span style="color: #000000;"> </span><span style="color: #0000FF;">public</span><span style="color: #000000;"> </span><span style="color: #0000FF;">class</span><span style="color: #000000;"> ItemDB : DbContext </span><span style="color: #008080;"> 2</span> <span style="color: #000000;"> { </span><span style="color: #008080;"> 3</span> <span style="color: #000000;"> </span><span style="color: #0000FF;">public</span><span style="color: #000000;"> DbSet</span><span style="color: #000000;">&lt;</span><span style="color: #000000;">Item</span><span style="color: #000000;">&gt;</span><span style="color: #000000;"> Items { </span><span style="color: #0000FF;">get</span><span style="color: #000000;">; </span><span style="color: #0000FF;">set</span><span style="color: #000000;">; } </span><span style="color: #008080;"> 4</span> <span style="color: #000000;"> </span><span style="color: #008080;"> 5</span> <span style="color: #000000;"> </span><span style="color: #0000FF;">protected</span><span style="color: #000000;"> </span><span style="color: #0000FF;">override</span><span style="color: #000000;"> </span><span style="color: #0000FF;">void</span><span style="color: #000000;"> OnConfiguring(DbContextOptions options) </span><span style="color: #008080;"> 6</span> <span style="color: #000000;"> { </span><span style="color: #008080;"> 7</span> <span style="color: #000000;"> options.UseAzureTableStorage(</span><span style="color: #800000;">"</span><span style="color: #800000;">[Storage_Name]</span><span style="color: #800000;">"</span><span style="color: #000000;">, </span><span style="color: #800000;">"</span><span style="color: #800000;">[Secret_Key</span><span style="color: #800000;">"</span><span style="color: #000000;">); </span><span style="color: #008080;"> 8</span> <span style="color: #000000;"> } </span><span style="color: #008080;"> 9</span> <span style="color: #000000;"> </span><span style="color: #008080;">10</span> <span style="color: #000000;"> </span><span style="color: #0000FF;">protected</span><span style="color: #000000;"> </span><span style="color: #0000FF;">override</span><span style="color: #000000;"> </span><span style="color: #0000FF;">void</span><span style="color: #000000;"> OnModelCreating(ModelBuilder modelBuilder) </span><span style="color: #008080;">11</span> <span style="color: #000000;"> { </span><span style="color: #008080;">12</span> <span style="color: #000000;"> modelBuilder.Entity</span><span style="color: #000000;">&lt;</span><span style="color: #000000;">Item</span><span style="color: #000000;">&gt;</span><span style="color: #000000;">().ForAzureTableStorage() </span><span style="color: #008080;">13</span> <span style="color: #000000;"> .PartitionAndRowKey(a </span><span style="color: #000000;">=&gt;</span><span style="color: #000000;"> a.CategoryId, a </span><span style="color: #000000;">=&gt;</span><span style="color: #000000;"> a.Id) </span><span style="color: #008080;">14</span> <span style="color: #000000;"> .Table(</span><span style="color: #800000;">"</span><span style="color: #800000;">Items</span><span style="color: #800000;">"</span><span style="color: #000000;">); </span><span style="color: #008080;">15</span> <span style="color: #000000;"> } </span><span style="color: #008080;">16</span> <span style="color: #000000;"> }</span></div></pre><!-- Code inserted with Steve Dunn's Windows Live Writer Code Formatter Plugin. http://dunnhq.com --></div> <p>Rispetto all’esempio precedente è stato rimosso il metodo di estensione <em>UseSqlServer</em> ed aggiunto un degli overload di <em>UseAzureTableStorage </em>che accetta in ingresso due parametri: <em>accountName</em> ed <em>accountKey</em>. Tramite l’override di <em>OnModelCreating</em> andiamo ad istruire il runtime sulle propietà della classe <em>Item</em> che rappresentato rispettivamente la <em>PartitionKey</em> e la <em>RowKey</em> del <em>Table Storage</em> su Azure. Modifichiamo il file <em>Project.json</em> commentando la voce <em>aspnetcore50</em> nella sezione frameworks:</p> <p><a href="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/ASP.NET-5-e-AzureTableStorage_12A85/image_6.png"><img title="image" style="border-top: 0px; border-right: 0px; background-image: none; border-bottom: 0px; padding-top: 0px; padding-left: 0px; margin: 0px; border-left: 0px; display: inline; padding-right: 0px" border="0" alt="image" src="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/ASP.NET-5-e-AzureTableStorage_12A85/image_thumb_2.png" width="244" height="136" /></a></p> <p>La classe <em>Item</em> modificata è la seguente:</p> <div id="scid:9D7513F9-C04C-4721-824A-2B34F0212519:670be0b5-84a3-4f04-9dc1-58a7b1edaad9" class="wlWriterEditableSmartContent" style="float: none; padding-bottom: 0px; padding-top: 0px; padding-left: 0px; margin: 0px; display: inline; padding-right: 0px"><pre style=" width: 503px; height: 133px;background-color:White;white-space:-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; white-space: pre-wrap; word-wrap: break-word;overflow: auto;"><div><!-- Code highlighting produced by Actipro CodeHighlighter (freeware) http://www.CodeHighlighter.com/ --><span style="color: #008080;">1</span> <span style="color: #000000;"> </span><span style="color: #0000FF;">public</span><span style="color: #000000;"> </span><span style="color: #0000FF;">class</span><span style="color: #000000;"> Item </span><span style="color: #008080;">2</span> <span style="color: #000000;"> { </span><span style="color: #008080;">3</span> <span style="color: #000000;"> </span><span style="color: #0000FF;">public</span><span style="color: #000000;"> </span><span style="color: #0000FF;">int</span><span style="color: #000000;"> Id { </span><span style="color: #0000FF;">get</span><span style="color: #000000;">; </span><span style="color: #0000FF;">set</span><span style="color: #000000;">; } </span><span style="color: #008080;">4</span> <span style="color: #000000;"> </span><span style="color: #0000FF;">public</span><span style="color: #000000;"> </span><span style="color: #0000FF;">int</span><span style="color: #000000;"> CategoryId { </span><span style="color: #0000FF;">get</span><span style="color: #000000;">; </span><span style="color: #0000FF;">set</span><span style="color: #000000;">; } </span><span style="color: #008080;">5</span> <span style="color: #000000;"> </span><span style="color: #0000FF;">public</span><span style="color: #000000;"> </span><span style="color: #0000FF;">string</span><span style="color: #000000;"> Code { </span><span style="color: #0000FF;">get</span><span style="color: #000000;">; </span><span style="color: #0000FF;">set</span><span style="color: #000000;">; } </span><span style="color: #008080;">6</span> <span style="color: #000000;"> </span><span style="color: #0000FF;">public</span><span style="color: #000000;"> </span><span style="color: #0000FF;">string</span><span style="color: #000000;"> Description { </span><span style="color: #0000FF;">get</span><span style="color: #000000;">; </span><span style="color: #0000FF;">set</span><span style="color: #000000;">; } </span><span style="color: #008080;">7</span> <span style="color: #000000;"> }</span></div></pre><!-- Code inserted with Steve Dunn's Windows Live Writer Code Formatter Plugin. http://dunnhq.com --></div> <p>Infine modifichiamo la classe <em>Program.cs</em>:</p> <p> </p><div id="scid:9D7513F9-C04C-4721-824A-2B34F0212519:39117039-548a-45de-ae40-9252b10f3597" class="wlWriterEditableSmartContent" style="float: none; padding-bottom: 0px; padding-top: 0px; padding-left: 0px; margin: 0px; display: inline; padding-right: 0px"><pre style=" width: 810px; height: 470px;background-color:White;white-space:-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; white-space: pre-wrap; word-wrap: break-word;overflow: auto;"><div><!-- Code highlighting produced by Actipro CodeHighlighter (freeware) http://www.CodeHighlighter.com/ --><span style="color: #008080;"> 1</span> <span style="color: #000000;"> </span><span style="color: #0000FF;">public</span><span style="color: #000000;"> </span><span style="color: #0000FF;">void</span><span style="color: #000000;"> Main(</span><span style="color: #0000FF;">string</span><span style="color: #000000;">[] args) </span><span style="color: #008080;"> 2</span> <span style="color: #000000;"> { </span><span style="color: #008080;"> 3</span> <span style="color: #000000;"> </span><span style="color: #0000FF;">using</span><span style="color: #000000;"> (ItemDB db </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">new</span><span style="color: #000000;"> ItemDB()) </span><span style="color: #008080;"> 4</span> <span style="color: #000000;"> { </span><span style="color: #008080;"> 5</span> <span style="color: #000000;"> </span><span style="color: #0000FF;">int</span><span style="color: #000000;"> nextId </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">new</span><span style="color: #000000;"> Random().Next(</span><span style="color: #800080;">100000</span><span style="color: #000000;">); </span><span style="color: #008080;"> 6</span> <span style="color: #000000;"> </span><span style="color: #008080;"> 7</span> <span style="color: #000000;"> db.Items.Add(</span><span style="color: #0000FF;">new</span><span style="color: #000000;"> Item() </span><span style="color: #008080;"> 8</span> <span style="color: #000000;"> { </span><span style="color: #008080;"> 9</span> <span style="color: #000000;"> Id </span><span style="color: #000000;">=</span><span style="color: #000000;"> nextId, </span><span style="color: #008080;">10</span> <span style="color: #000000;"> Code </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #800000;">"</span><span style="color: #800000;">Item #</span><span style="color: #800000;">"</span><span style="color: #000000;"> </span><span style="color: #000000;">+</span><span style="color: #000000;"> nextId, </span><span style="color: #008080;">11</span> <span style="color: #000000;"> Description </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #800000;">"</span><span style="color: #800000;">Description #</span><span style="color: #800000;">"</span><span style="color: #000000;"> </span><span style="color: #000000;">+</span><span style="color: #000000;"> nextId </span><span style="color: #008080;">12</span> <span style="color: #000000;"> }); </span><span style="color: #008080;">13</span> <span style="color: #000000;"> </span><span style="color: #008080;">14</span> <span style="color: #000000;"> db.SaveChanges(); </span><span style="color: #008080;">15</span> <span style="color: #000000;"> } </span><span style="color: #008080;">16</span> <span style="color: #000000;"> </span><span style="color: #008080;">17</span> <span style="color: #000000;"> </span><span style="color: #0000FF;">using</span><span style="color: #000000;"> (ItemDB db </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">new</span><span style="color: #000000;"> ItemDB()) </span><span style="color: #008080;">18</span> <span style="color: #000000;"> { </span><span style="color: #008080;">19</span> <span style="color: #000000;"> </span><span style="color: #0000FF;">foreach</span><span style="color: #000000;"> (Item item </span><span style="color: #0000FF;">in</span><span style="color: #000000;"> db.Items) </span><span style="color: #008080;">20</span> <span style="color: #000000;"> { </span><span style="color: #008080;">21</span> <span style="color: #000000;"> Console.WriteLine(</span><span style="color: #800000;">"</span><span style="color: #800000;">Item Id: {0}, Code: {1}, Description : {2}</span><span style="color: #800000;">"</span><span style="color: #000000;">, </span><span style="color: #008080;">22</span> <span style="color: #000000;"> item.Id, item.Code, item.Description); </span><span style="color: #008080;">23</span> <span style="color: #000000;"> } </span><span style="color: #008080;">24</span> <span style="color: #000000;"> } </span><span style="color: #008080;">25</span> <span style="color: #000000;"> </span><span style="color: #008080;">26</span> <span style="color: #000000;"> Console.ReadLine(); </span><span style="color: #008080;">27</span> <span style="color: #000000;"> }</span></div></pre><!-- Code inserted with Steve Dunn's Windows Live Writer Code Formatter Plugin. http://dunnhq.com --></div> <p>Proviamo quindi ad eseguire l’applicazione:</p> <p><a href="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/ASP.NET-5-e-AzureTableStorage_12A85/image_8.png"><img title="image" style="border-top: 0px; border-right: 0px; background-image: none; border-bottom: 0px; padding-top: 0px; padding-left: 0px; margin: 0px; border-left: 0px; display: inline; padding-right: 0px" border="0" alt="image" src="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/ASP.NET-5-e-AzureTableStorage_12A85/image_thumb_3.png" width="244" height="126" /></a></p> <p>Ulteriore prova che tutto funzioni correttamente si puo’ avere utizzando <a href="https://azurestorageexplorer.codeplex.com/" target="_blank">l’”Azure Storage Explorer”</a>:</p> <p><a href="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/ASP.NET-5-e-AzureTableStorage_12A85/image_10.png"><img title="image" style="border-top: 0px; border-right: 0px; background-image: none; border-bottom: 0px; padding-top: 0px; padding-left: 0px; margin: 0px; border-left: 0px; display: inline; padding-right: 0px" border="0" alt="image" src="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/ASP.NET-5-e-AzureTableStorage_12A85/image_thumb_4.png" width="244" height="95" /></a></p><img src="http://blogs.ugidotnet.org/PietroLibroBlog/aggbug/101909.aspx" width="1" height="1" /> Pietro Libro http://blogs.ugidotnet.org/PietroLibroBlog/archive/2014/11/30/asp.net-5-e-azuretablestorage.aspx Sun, 30 Nov 2014 23:48:00 GMT http://blogs.ugidotnet.org/PietroLibroBlog/archive/2014/11/30/asp.net-5-e-azuretablestorage.aspx#feedback http://blogs.ugidotnet.org/PietroLibroBlog/comments/commentRss/101909.aspx http://blogs.ugidotnet.org/PietroLibroBlog/services/trackbacks/101909.aspx ASP.NET 5 e Entity Framework 7 (beta) http://blogs.ugidotnet.org/PietroLibroBlog/archive/2014/11/30/asp.net-5-e-entity-framework-7-beta.aspx <p>Vediamo in questo post come iniziare a giocare con Entity Framework 7 “beta” (in “beta” solo per uniformità con in rilascio della preview di VS 2015, cosi come descritto in questo <a href="http://blogs.msdn.com/b/adonet/archive/2014/11/12/visual-studio-2015-preview-and-entity-framework.aspx" target="_blank">post</a>). Partiamo con aprire VS 2015 e creare un progetto di tipo “ASP.NET 5 Console Application”:</p> <p><a href="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/MVC6-e-Entity-Framework-7_10E1E/image_6.png"><img title="image" style="border-top: 0px; border-right: 0px; background-image: none; border-bottom: 0px; padding-top: 0px; padding-left: 0px; border-left: 0px; display: inline; padding-right: 0px" border="0" alt="image" src="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/MVC6-e-Entity-Framework-7_10E1E/image_thumb_2.png" width="244" height="170" /></a></p> <p>Per utilizzare Entity Framework 7, apriamo il file <em>Project.json</em> e aggiungiamo nella sezione <em>dependencies</em> le tre dipendenze seguenti:</p> <ol> <li>"EntityFramework": "7.0.0-beta1"</li> <li>"EntityFramework.Commands" : "7.0.0-beta1"</li> <li>"EntityFramework.SqlServer": "7.0.0-beta1"</li> </ol> <p>Le dipendenze 1 e 3 ci servono per integrare EF nel nostro progetto ed “informare” che andremo a lavorare utilizzando EF per SQL Server (dato che nella nuova versione, il provider di EF puo’ essere utilzzato nativamente per interagire con <em>SqlServer</em>, <em>SqlLite</em>, <em>AzureTableStorage</em> e <em>InMemory</em>, quindi non solo database relazionali), la dipendenza 3 ci serve per utilizzare i comandi di <em>DB Migration</em> all’interno del nostro progetto.</p> <p>Sempre in <em>Project.json</em> aggiungiamo la sezione <em>Commands</em> con la relativa voce “EF”:</p> <p>"commands": { <br />    "ef": "EntityFramework.Commands" <br />}, <br /></p> <p> </p> <p>Cosi’ che alla fine delle modifiche il file <em>Project.json</em> sia simile a quanto illustrato nella figura seguente:</p> <p><a href="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/MVC6-e-Entity-Framework-7_10E1E/image_28.png"><img title="image" style="border-top: 0px; border-right: 0px; background-image: none; border-bottom: 0px; padding-top: 0px; padding-left: 0px; margin: 0px; border-left: 0px; display: inline; padding-right: 0px" border="0" alt="image" src="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/MVC6-e-Entity-Framework-7_10E1E/image_thumb_13.png" width="244" height="165" /></a></p> <p> <br />Aggiungiamo al progetto un file di tipo “ASP.NET Configuration file” (<em>Config.json</em>):</p> <p><a href="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/MVC6-e-Entity-Framework-7_10E1E/image_10.png"><img title="image" style="border-top: 0px; border-right: 0px; background-image: none; border-bottom: 0px; padding-top: 0px; padding-left: 0px; margin: 0px; border-left: 0px; display: inline; padding-right: 0px" border="0" alt="image" src="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/MVC6-e-Entity-Framework-7_10E1E/image_thumb_4.png" width="244" height="170" /></a></p> <p>Il quale di Default si presenta in questo modo:</p> <p><a href="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/MVC6-e-Entity-Framework-7_10E1E/image_12.png"><img title="image" style="border-top: 0px; border-right: 0px; background-image: none; border-bottom: 0px; padding-top: 0px; padding-left: 0px; margin: 0px; border-left: 0px; display: inline; padding-right: 0px" border="0" alt="image" src="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/MVC6-e-Entity-Framework-7_10E1E/image_thumb_5.png" width="244" height="44" /></a></p> <p>Nella sezione “Data\DefaultConnection” modifichiamo la voce <em>ConnectionString</em> editando la propietà <em>Database</em> oppure cambiando l’intera stringa di connessione, secondo di dove vogliamo ospitare il nostro database (Istanza di SQL Server Express piuttosto che LocalDB ad esempio). Tramite “NuGet Package Manager” (molto piu’ carino graficamente di quello precedente), aggiungiamo un riferimento al Package “Microsoft.Framework.ConfigurationModel.Json” :</p> <p><a href="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/MVC6-e-Entity-Framework-7_10E1E/image_14.png"><img title="image" style="border-top: 0px; border-right: 0px; background-image: none; border-bottom: 0px; padding-top: 0px; padding-left: 0px; margin: 0px; border-left: 0px; display: inline; padding-right: 0px" border="0" alt="image" src="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/MVC6-e-Entity-Framework-7_10E1E/image_thumb_6.png" width="244" height="120" /></a></p> <p>Aggiungiamo al progetto il file <em>Startup.cs</em>:</p> <p><a href="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/MVC6-e-Entity-Framework-7_10E1E/image_22.png"><img title="image" style="border-top: 0px; border-right: 0px; background-image: none; border-bottom: 0px; padding-top: 0px; padding-left: 0px; margin: 0px; border-left: 0px; display: inline; padding-right: 0px" border="0" alt="image" src="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/MVC6-e-Entity-Framework-7_10E1E/image_thumb_10.png" width="244" height="170" /></a></p> <p>E modifichiamolo come segue:</p> <div id="scid:9D7513F9-C04C-4721-824A-2B34F0212519:8620001f-96b5-4991-9017-2083cf6e37d2" class="wlWriterEditableSmartContent" style="float: none; padding-bottom: 0px; padding-top: 0px; padding-left: 0px; margin: 0px; display: inline; padding-right: 0px"><pre style=" width: 938px; height: 191px;background-color:White;white-space:-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; white-space: pre-wrap; word-wrap: break-word;overflow: auto;"><div><!-- Code highlighting produced by Actipro CodeHighlighter (freeware) http://www.CodeHighlighter.com/ --><span style="color: #008080;"> 1</span> <span style="color: #000000;"> </span><span style="color: #0000FF;">public</span><span style="color: #000000;"> </span><span style="color: #0000FF;">class</span><span style="color: #000000;"> Startup </span><span style="color: #008080;"> 2</span> <span style="color: #000000;"> { </span><span style="color: #008080;"> 3</span> <span style="color: #000000;"> </span><span style="color: #0000FF;">public</span><span style="color: #000000;"> </span><span style="color: #0000FF;">static</span><span style="color: #000000;"> Microsoft.Framework.ConfigurationModel.IConfiguration Configuration { </span><span style="color: #0000FF;">get</span><span style="color: #000000;">; </span><span style="color: #0000FF;">set</span><span style="color: #000000;">; } </span><span style="color: #008080;"> 4</span> <span style="color: #000000;"> </span><span style="color: #008080;"> 5</span> <span style="color: #000000;"> </span><span style="color: #0000FF;">static</span><span style="color: #000000;"> Startup() </span><span style="color: #008080;"> 6</span> <span style="color: #000000;"> { </span><span style="color: #008080;"> 7</span> <span style="color: #000000;"> Configuration </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">new</span><span style="color: #000000;"> Microsoft.Framework.ConfigurationModel.Configuration() </span><span style="color: #008080;"> 8</span> <span style="color: #000000;"> .AddJsonFile(</span><span style="color: #800000;">"</span><span style="color: #800000;">config.json</span><span style="color: #800000;">"</span><span style="color: #000000;">).AddEnvironmentVariables(); </span><span style="color: #008080;"> 9</span> <span style="color: #000000;"> } </span><span style="color: #008080;">10</span> <span style="color: #000000;"> }</span></div></pre><!-- Code inserted with Steve Dunn's Windows Live Writer Code Formatter Plugin. http://dunnhq.com --></div> <p>Aggiungiamo al progetto due nuovi classi C#, “Item” e “ItemDB”, dove “ItemDB” è la classe derivata da <em>System.Data.Entity.DbContext</em> ed “Item” il <em>Data Model</em>:</p> <div id="scid:9D7513F9-C04C-4721-824A-2B34F0212519:354721b5-c166-4535-a2b5-b9c53668d10b" class="wlWriterEditableSmartContent" style="float: none; padding-bottom: 0px; padding-top: 0px; padding-left: 0px; margin: 0px; display: inline; padding-right: 0px"><pre style=" width: 938px; height: 282px;background-color:White;white-space:-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; white-space: pre-wrap; word-wrap: break-word;overflow: auto;"><div><!-- Code highlighting produced by Actipro CodeHighlighter (freeware) http://www.CodeHighlighter.com/ --><span style="color: #008080;"> 1</span> <span style="color: #000000;"> </span><span style="color: #0000FF;">public</span><span style="color: #000000;"> </span><span style="color: #0000FF;">class</span><span style="color: #000000;"> Item </span><span style="color: #008080;"> 2</span> <span style="color: #000000;"> { </span><span style="color: #008080;"> 3</span> <span style="color: #000000;"> </span><span style="color: #0000FF;">public</span><span style="color: #000000;"> </span><span style="color: #0000FF;">int</span><span style="color: #000000;"> Id { </span><span style="color: #0000FF;">get</span><span style="color: #000000;">; </span><span style="color: #0000FF;">set</span><span style="color: #000000;">; } </span><span style="color: #008080;"> 4</span> <span style="color: #000000;"> </span><span style="color: #0000FF;">public</span><span style="color: #000000;"> </span><span style="color: #0000FF;">string</span><span style="color: #000000;"> Code { </span><span style="color: #0000FF;">get</span><span style="color: #000000;">; </span><span style="color: #0000FF;">set</span><span style="color: #000000;">; } </span><span style="color: #008080;"> 5</span> <span style="color: #000000;"> </span><span style="color: #0000FF;">public</span><span style="color: #000000;"> </span><span style="color: #0000FF;">string</span><span style="color: #000000;"> Description { </span><span style="color: #0000FF;">get</span><span style="color: #000000;">; </span><span style="color: #0000FF;">set</span><span style="color: #000000;">; } </span><span style="color: #008080;"> 6</span> <span style="color: #000000;"> } </span><span style="color: #008080;"> 7</span> <span style="color: #000000;"> </span><span style="color: #008080;"> 8</span> <span style="color: #000000;"> </span><span style="color: #0000FF;">public</span><span style="color: #000000;"> </span><span style="color: #0000FF;">class</span><span style="color: #000000;"> ItemDB : DbContext </span><span style="color: #008080;"> 9</span> <span style="color: #000000;"> { </span><span style="color: #008080;">10</span> <span style="color: #000000;"> </span><span style="color: #0000FF;">public</span><span style="color: #000000;"> DbSet</span><span style="color: #000000;">&lt;</span><span style="color: #000000;">Item</span><span style="color: #000000;">&gt;</span><span style="color: #000000;"> Items { </span><span style="color: #0000FF;">get</span><span style="color: #000000;">; </span><span style="color: #0000FF;">set</span><span style="color: #000000;">; } </span><span style="color: #008080;">11</span> <span style="color: #000000;"> </span><span style="color: #008080;">12</span> <span style="color: #000000;"> </span><span style="color: #0000FF;">protected</span><span style="color: #000000;"> </span><span style="color: #0000FF;">override</span><span style="color: #000000;"> </span><span style="color: #0000FF;">void</span><span style="color: #000000;"> OnConfiguring(DbContextOptions options) </span><span style="color: #008080;">13</span> <span style="color: #000000;"> { </span><span style="color: #008080;">14</span> <span style="color: #000000;"> options.UseSqlServer(Startup.Configuration.Get(</span><span style="color: #800000;">"</span><span style="color: #800000;">Data:DefaultConnection:ConnectionString</span><span style="color: #800000;">"</span><span style="color: #000000;">)); </span><span style="color: #008080;">15</span> <span style="color: #000000;"> } </span><span style="color: #008080;">16</span> <span style="color: #000000;"> }</span></div></pre><!-- Code inserted with Steve Dunn's Windows Live Writer Code Formatter Plugin. http://dunnhq.com --></div> <p>Il nuovo metodo <em>OnConfigure</em> di cui abbiamo eseguito <em>l’override</em> ci permette di specificare quale <em>Data Provider</em> (nel nostro caso SqlServer) lavorerà con il nostro <em>DbContext</em>. <em>UseSqlServer</em> accetta come parametro  una stringa di connessione che recuperiamo dal file <em>Config.json</em> tramite la proprietà <em>Configuration</em> (<em>Microsoft.Framework.ConfigurationModel.IConfiguration</em>) presente nella classe <em>Startup.cs</em>.</p> <p>Per utilizzare EF Migrations, non è ancora finita, in quanto è necessario installare e configurare KVM (<a href="https://github.com/aspnet/Home/wiki/version-manager" target="_blank">K Version Manager</a>), sul sito è presente una piccola guida all’installazione. </p> <p>Apriamo un’istanza di Windows PowerShell (o Command Prompt secondo le preferenze) e ci spostiamo nella directory del nostro progetto, dopo digitiamo il comando “K ef migration add initial”:</p> <p><a href="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/MVC6-e-Entity-Framework-7_10E1E/image_16.png"><img title="image" style="border-top: 0px; border-right: 0px; background-image: none; border-bottom: 0px; padding-top: 0px; padding-left: 0px; margin: 0px; border-left: 0px; display: inline; padding-right: 0px" border="0" alt="image" src="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/MVC6-e-Entity-Framework-7_10E1E/image_thumb_7.png" width="244" height="18" /></a></p> <p>Se tutto è stato eseguito correttamente, nel nostro progetto viene aggiunta la classica cartella “Migrations” con tutti i file necessari:</p> <p><a href="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/MVC6-e-Entity-Framework-7_10E1E/image_24.png"><img title="image" style="border-top: 0px; border-right: 0px; background-image: none; border-bottom: 0px; padding-top: 0px; padding-left: 0px; margin: 0px; border-left: 0px; display: inline; padding-right: 0px" border="0" alt="image" src="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/MVC6-e-Entity-Framework-7_10E1E/image_thumb_11.png" width="244" height="168" /></a></p> <p>Applichiamo quindi il nostro “piano di migrazione” tramite il comando “migration apply”:</p> <p><a href="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/MVC6-e-Entity-Framework-7_10E1E/image_20.png"><img title="image" style="border-top: 0px; border-right: 0px; background-image: none; border-bottom: 0px; padding-top: 0px; padding-left: 0px; margin: 0px; border-left: 0px; display: inline; padding-right: 0px" border="0" alt="image" src="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/MVC6-e-Entity-Framework-7_10E1E/image_thumb_9.png" width="244" height="21" /></a></p> <p>Ora possiamo testare che tutto <em>l’Ambaradan </em>(<img class="wlEmoticon wlEmoticon-smile" style="border-top-style: none; border-bottom-style: none; border-right-style: none; border-left-style: none" alt="Smile" src="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/MVC6-e-Entity-Framework-7_10E1E/wlEmoticon-smile_2.png" />) funzioni, modificando la classe <em>Programs.cs</em> in questo modo:</p> <div id="scid:9D7513F9-C04C-4721-824A-2B34F0212519:23d1cb5a-b83b-4310-a467-63b1e4d336e2" class="wlWriterEditableSmartContent" style="float: none; padding-bottom: 0px; padding-top: 0px; padding-left: 0px; margin: 0px; display: inline; padding-right: 0px"><pre style=" width: 938px; height: 460px;background-color:White;white-space:-moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; white-space: pre-wrap; word-wrap: break-word;overflow: auto;"><div><!-- Code highlighting produced by Actipro CodeHighlighter (freeware) http://www.CodeHighlighter.com/ --><span style="color: #008080;"> 1</span> <span style="color: #000000;"> </span><span style="color: #0000FF;">public</span><span style="color: #000000;"> </span><span style="color: #0000FF;">void</span><span style="color: #000000;"> Main(</span><span style="color: #0000FF;">string</span><span style="color: #000000;">[] args) </span><span style="color: #008080;"> 2</span> <span style="color: #000000;"> { </span><span style="color: #008080;"> 3</span> <span style="color: #000000;"> </span><span style="color: #808080;">///</span><span style="color: #008000;">/Save data.</span><span style="color: #808080;"> </span><span style="color: #008080;"> 4</span> <span style="color: #808080;" /><span style="color: #000000;"> </span><span style="color: #0000FF;">using</span><span style="color: #000000;"> (ItemDB db </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">new</span><span style="color: #000000;"> ItemDB()) </span><span style="color: #008080;"> 5</span> <span style="color: #000000;"> { </span><span style="color: #008080;"> 6</span> <span style="color: #000000;"> db.Items.Add(</span><span style="color: #0000FF;">new</span><span style="color: #000000;"> Item() </span><span style="color: #008080;"> 7</span> <span style="color: #000000;"> { </span><span style="color: #008080;"> 8</span> <span style="color: #000000;"> Code </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #800000;">"</span><span style="color: #800000;">Item #1</span><span style="color: #800000;">"</span><span style="color: #000000;">, </span><span style="color: #008080;"> 9</span> <span style="color: #000000;"> Description </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #800000;">"</span><span style="color: #800000;">Description #1</span><span style="color: #800000;">"</span><span style="color: #000000;"> </span><span style="color: #008080;">10</span> <span style="color: #000000;"> }); </span><span style="color: #008080;">11</span> <span style="color: #000000;"> </span><span style="color: #008080;">12</span> <span style="color: #000000;"> db.SaveChanges(); </span><span style="color: #008080;">13</span> <span style="color: #000000;"> } </span><span style="color: #008080;">14</span> <span style="color: #000000;"> </span><span style="color: #008080;">15</span> <span style="color: #000000;"> </span><span style="color: #808080;">///</span><span style="color: #008000;">/Load data.</span><span style="color: #808080;"> </span><span style="color: #008080;">16</span> <span style="color: #808080;" /><span style="color: #000000;"> </span><span style="color: #0000FF;">using</span><span style="color: #000000;"> (ItemDB db </span><span style="color: #000000;">=</span><span style="color: #000000;"> </span><span style="color: #0000FF;">new</span><span style="color: #000000;"> ItemDB()) </span><span style="color: #008080;">17</span> <span style="color: #000000;"> { </span><span style="color: #008080;">18</span> <span style="color: #000000;"> </span><span style="color: #0000FF;">foreach</span><span style="color: #000000;"> (Item item </span><span style="color: #0000FF;">in</span><span style="color: #000000;"> db.Items) </span><span style="color: #008080;">19</span> <span style="color: #000000;"> { </span><span style="color: #008080;">20</span> <span style="color: #000000;"> Console.WriteLine(</span><span style="color: #800000;">"</span><span style="color: #800000;">Item Id: {0}, Code: {1}, Description : {2}</span><span style="color: #800000;">"</span><span style="color: #000000;">, </span><span style="color: #008080;">21</span> <span style="color: #000000;"> item.Id, item.Code, item.Description); </span><span style="color: #008080;">22</span> <span style="color: #000000;"> } </span><span style="color: #008080;">23</span> <span style="color: #000000;"> } </span><span style="color: #008080;">24</span> <span style="color: #000000;"> </span><span style="color: #008080;">25</span> <span style="color: #000000;"> Console.ReadLine(); </span><span style="color: #008080;">26</span> <span style="color: #000000;"> }</span></div></pre><!-- Code inserted with Steve Dunn's Windows Live Writer Code Formatter Plugin. http://dunnhq.com --></div> <p>E poi avviando il tutto con un bel F5:</p> <p><a href="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/MVC6-e-Entity-Framework-7_10E1E/image_26.png"><img title="image" style="border-top: 0px; border-right: 0px; background-image: none; border-bottom: 0px; padding-top: 0px; padding-left: 0px; margin: 0px; border-left: 0px; display: inline; padding-right: 0px" border="0" alt="image" src="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/MVC6-e-Entity-Framework-7_10E1E/image_thumb_12.png" width="244" height="126" /></a></p> <p>Sicuramente la versione 7 di EF è ancora “poco” matura per essere utiizzata in progetti reali, ma questo esempio vuole essere un punto di partenza per scoprire quali novità ci attendono <img class="wlEmoticon wlEmoticon-smile" style="border-top-style: none; border-bottom-style: none; border-right-style: none; border-left-style: none" alt="Smile" src="http://blogs.ugidotnet.org/images/blogs_ugidotnet_org/PietroLibroBlog/Windows-Live-Writer/MVC6-e-Entity-Framework-7_10E1E/wlEmoticon-smile_2.png" /></p><img src="http://blogs.ugidotnet.org/PietroLibroBlog/aggbug/101908.aspx" width="1" height="1" /> Pietro Libro http://blogs.ugidotnet.org/PietroLibroBlog/archive/2014/11/30/asp.net-5-e-entity-framework-7-beta.aspx Sun, 30 Nov 2014 13:21:00 GMT http://blogs.ugidotnet.org/PietroLibroBlog/archive/2014/11/30/asp.net-5-e-entity-framework-7-beta.aspx#feedback http://blogs.ugidotnet.org/PietroLibroBlog/comments/commentRss/101908.aspx http://blogs.ugidotnet.org/PietroLibroBlog/services/trackbacks/101908.aspx