CODEWITHSUNDEEP
c#
behi behzadi
behi behzadi

Reputation: 3

How can i solve Cannot implicitly convert type System.Collections.Generic.List?

I have this model in C#:

public class interfaceModel
{
    public string interfacename { get; set; }
    public long  id { get; set; }
}

and write this code:

public static List<interfaceModel> CompanyInterfaceFetch()
{
    var database = new DataBaseDataContext();
    var companyinterface = new CompanyInterface();

    var interfacelist =
                database.CompanyInterfaces.Select(x => new interfaceModel { interfacename = x.InterfaceName, id=x.id});
    return interfacelist.ToList();
}

// database model
public class interfaceModel
{
    public string interfacename { get; set; }
    public long id { get; set; }
}

Now I write code to call that method:

public static List<interfaceModel> interfacefetch()
{
    return Database.CompanyInterfaceFetch();
}

but on this line:

return Database.CompanyInterfaceFetch();

I get this error:

Error CS0029: Cannot implicitly convert type 'System.Collections.Generic.List' to 'System.Collections.Generic.List

How can I solve that problem? Thanks.

Upvotes: 0

Views: 3163

Answers (3)

Numan
Numan

Reputation: 3948

Since you have two types spread out in different namespaces, you cannot convert from one type to another.

To me it looks alright, from design perspective!

One of the ways to solve this problem would be to employ Automapper!

Upvotes: -1

Kempeth
Kempeth

Reputation: 1948

Your Error is clear:

Error CS0029 Cannot implicitly convert

type 'System.Collections.Generic.List<Web.Controllers.Database.interfaceModel>'

to 'System.Collections.Generic.List<Web.Models.interfaceModel>'

You have two types of the same name in these two locations.

If they have the same fields then you should remove one of them. If they are different then you need to fix the imports in your code so that CompanyInterfaceFetch() and interfacefetch() refer to the same type. If necessary drop the imports and specify the fully qualified class name (like in the exception message).

Upvotes: 0

Patrick Hofman
Patrick Hofman

Reputation: 156918

You have two separate classes with the same name. Judging the naming, this is the location of both:

  • Controllers > Database > interfaceModel
  • Models > interfaceModel

The two types, although they have the same name and even might have the exact same fields, are not exchangeable. Remove either of them and compile again to check the errors to see what adjustments you have to make.

Upvotes: 3

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