Returning a list using Entity Framework

Question

I am trying to return list. Any suggestion would be highly appreciable. Thanks in Advance.

It throws this error:

Cannot implicitly convert type System.Collections.Generic.List<HTentityFramework.tblFlower> to
System.Collections.Generic.List<HTentityFramework.testDomain>

Code is:

public class GetFlowers
{
   public IList<testDomain> getFlowerList()
   {
      TestContainer ctx = new TestContainer();
      return ctx.tblFlowers.ToList();
   }
}

public class testDomain
{
    public string Name { get; set; }
    public int quantity { get; set; }
}

It Throws error as Error Cannot implicitly convert type 'System.Collections.Generic.List<HTentityFramework.tblFlower>' to 'System.Collections.Generic.List<HTentityFramework.testDomain>' — Kurkula
– Kurkula, Commented Mar 17, 2012 at 2:35

marc_s · Accepted Answer · 2012-03-17 08:43:23Z

4

The error is pretty clear - just read it!

The type you're returning from getFlowerList is IList<testDomain> - yet you're selecting from an EF object set that's called tblFlowers.

The error clearly says that this is an IList<tblFlower> - a list of tblFlower objects.

Your code cannot just convert a list of tblFlowers to a list of testDomain - that's the whole point.

You need to either provide a conversion yourself, or you need to return a IList<tblFlower> from your method:

public IList<tblFlower> getFlowerList()   <==== return an IList<tblFlower> here!!
{
    TestContainer ctx = new TestContainer();
    return ctx.tblFlowers.ToList();
}

answered Mar 17, 2012 at 8:43

marc_s

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2 Comments

Kurkula Over a year ago

Thanks for solving the issue. But dont we use TestDomain classes in Ilist?

marc_s Over a year ago

@Usham: if you select from tblFlowers, then you get back a list of tblFlower objects - so you need to return those ..... if you want to "hide" that fact and return some other type instead - it's up to you to provide some kind of a conversion/mapping from the real, actual type returned by EF (tblFlower) to some other datatype that you might have defined. Again: your job, and it needs to be clear, explicit - no magic in .NET can do this for you

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