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

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

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This article is provided by MVP Ming Man. Microsoft is so thankful that MVPs who proactively share their professional experience with other users. The article would be posted on MVP's website or blog 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.



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;
}


References

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

 
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Properties

Article ID: 2791121 - Last Review: April 1, 2013 - Revision: 2.0
Applies to
  • Microsoft Visual Studio Agents 2012
  • Microsoft Visual Studio Express 2012 for Web
  • Microsoft Visual Studio Express 2012 for Windows 8
  • Microsoft Visual Studio Express 2012 for Windows Desktop
  • Microsoft Visual Studio Express 2012 for Windows Phone
  • Microsoft Visual Studio Premium 2012
  • Microsoft Visual Studio Professional 2012
Keywords: 
kbmvp kbcommunity KB2791121

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