Async Query & Save with Entity Framework 6

The document showing the new feature of EF 6. You can now Query and Save asynchronously. When you read through the document http://msdn.microsoft.com/en-us/data/jj819165.aspx then you will find no source code associates with it.

The key code as follow:

The Model:

using System.Collections.Generic;

using System.Data.Entity;

 

 

namespace AsyncDemo

{

  publicclassBloggingContext : DbContext

  {

    publicDbSet<Blog> Blogs { get; set; }

    publicDbSet<Post> Posts { get; set; }

  }

 

  publicclassBlog

  {

    publicint BlogId { get; set; }

    publicstring Name { get; set; }

    publicvirtualList<Post> Posts { get; set; }

  }

 

  publicclassPost

  {

    publicint PostId { get; set; }

    publicstring Title { get; set; }

    publicstring Content { get; set; }

    publicint BlogId { get; set; }

    publicvirtualBlog Blog { get; set; }

  }

}

The main program:

using System;

using System.Data.Entity;

using System.Linq;

using System.Threading.Tasks;

 

namespace AsyncDemo

{

  classProgram

  {

    staticvoid Main(string[] args)

    {

      var task = PerformDatabaseOperations();

 

      Console.WriteLine(“Quote of the day”);

      Console.WriteLine(” Don’t worry about the world coming to an end today… “);

      Console.WriteLine(” It’s already tomorrow in Australia.”);

     

      task.Wait();

 

      Console.WriteLine();

      Console.WriteLine(“Press any key to exit…”);

      Console.ReadKey();

    }

 

    publicstaticasyncTask PerformDatabaseOperations()

    {

      using (var db = newBloggingContext())

      {

        // Create a new blog and save it

        db.Blogs.Add(newBlog

        {

          Name = “Test Blog #” + (db.Blogs.Count() + 1)

        });

 

        Console.WriteLine(“Calling SaveChanges.”);

        await db.SaveChangesAsync();

        Console.WriteLine(“SaveChanges completed.”);

 

        // Query for all blogs ordered by name

        Console.WriteLine(“Executing query.”);

        var blogs = await (from b in db.Blogs

                           orderby b.Name

                           select b).ToListAsync();

 

        // Write all blogs out to Console

        Console.WriteLine(“Query completed with following results:”);

        foreach (var blog in blogs)

        {

          Console.WriteLine(” – “ + blog.Name);

        }

      }

    }

  }

}

Download the sample project from http://skydrive.live.com.The sample file name is AsyncDemo.rar. My MSN ID is chanmmn@hotmail.com.

About chanmingman

Since March 2011 Microsoft Live Spaces migrated to Wordpress (http://www.pcworld.com/article/206455/Microsoft_Live_Spaces_Moves_to_WordPress_An_FAQ.html) till now, I have is over 1 million viewers. This blog is about more than 50% telling you how to resolve error messages, especial for Microsoft products. The blog also has a lot of guidance teaching you how to get stated certain Microsoft technologies. The blog also uses as a help to keep my memory. The blog is never meant to give people consulting services or silver bullet solutions. It is a contribution to the community. Thanks for your support over the years. Ming Man is Microsoft MVP since year 2006. He is a software development manager for a multinational company. With 25 years of experience in the IT field, he has developed system using Clipper, COBOL, VB5, VB6, VB.NET, Java and C #. He has been using Visual Studio (.NET) since the Beta back in year 2000. He and the team have developed many projects using .NET platform such as SCM, and HR based applications. He is familiar with the N-Tier design of business application and is also an expert with database experience in MS SQL, Oracle and AS 400.
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