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CRUD using Entity Framework in .NET Framework 5.0 - (Read)

Article ID: 2791121 - View products that this article applies to.

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This article is provided by MVP Ming Man

(http://mvp.microsoft.com/en-US/findanmvp/Pages/profile.aspx?MVPID=f4165dfe-8265-43d0-854c-2dbe82ac1fd2)

. Microsoft is so thankful that MVPs who proactively share their professional experience with other users. The article would be posted on MVP's website

(http://mvp.microsoft.com/en-US/findanmvp/Pages/profile.aspx?MVPID=f4165dfe-8265-43d0-854c-2dbe82ac1fd2)

or blog

(http://chanmingman.wordpress.com/)

later.

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Summary

This article covers ways to read from Entity Framework; read all the records, filtering records, group records and sort records.

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More information

Read all the records

The code below retrieves all the record from the product database table.

public static IEnumerable<Product> GetAllProduct()

{

//declare the data context from Entity Framework

northwindEntities ctx = new northwindEntities();

//retrieve all record from the database table

var result = from r in ctx.Products select r;

return result;

}

Filtering records

The code below retrieves the record, by supplying the product id, from the product database table.

public IEnumerable<Product> GetProductById(int Id)

{

//declare the data context from Entity Framework

northwindEntities ctx = new northwindEntities();

//retrieve record from the database table by id

var result = from r in ctx.Products where r.ProductID == Id select r;

return result;

}

Group records

The code below retrieves all the record from the product database table and group by CategoryID.

public IQueryable<IGrouping<int?, Product>> GetProductGroupBy(int Id)

{

northwindEntities ctx = new northwindEntities();

var result = ctx.Products.GroupBy(prod => prod.CategoryID);

return result;

}

Sort records

The code below retrieves all the record from the product database table and sorted by CategoryID.

public IQueryable<Product> GetProductOrderBy(int Id)

{

northwindEntities ctx = new northwindEntities();

var result = ctx.Products.OrderBy(prod => prod.CategoryID);

return result;

}

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References

For more information, see CRUD using Entity Framework in .NET Framework 5.0 - (Create)

(http://support.microsoft.com/kb/2780458/en-us?wa=wsignin1.0)

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