The type 'A' already contains a definition for 'Item'

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C#

class A
{
    public int Item()
    {
        throw new NotImplementedException();
    }

    public int this[int x] // error CS0102: The type 'A' already contains a definition for 'Item'
    {
        get { throw new NotImplementedException(); }
    }
}

Thanks for your help....

regrads
Nikhil

Posted 15-Feb-10 4:38am

Nikhil Nitesh Thakur

Updated 8-Jun-20 4:55am

Toli Cuturicu

v3

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benjamine 1-Jun-10 9:38am

The answer is here:
http://social.msdn.microsoft.com/forums/en-US/csharplanguage/thread/dbd2b263-824c-4f5b-ba18-2f6d117c8ad1/

C# creates an "Item" property automatically for indexers, but you can override it's name using an Attribute:

[System.Runtime.CompilerServices.IndexerName("MyItems"]
public Item this[int row, int col] { ... }

imendan 18-Jul-11 1:05am

Thanks a lot!

2 solutions

Solution 1

"this" is a keyword - you cannot name any method, field or property "this".
Change the name, and all will be well.

Posted 15-Feb-10 4:39am

OriginalGriff

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Toli Cuturicu · Accepted Answer · 2010-02-15T05:09:00

Yes, that's true.
Both your members are called Item.
There is a method called Item and an indexer... (all indexers are automatically called Item)
Just have a look at the documentation for class List for example. There look at the members. You should see Item. Click on it and you will be viewing the documentation about the indexer!