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c#.netindexer
Michael
Michael

Reputation: 3150

Class with indexer and property named "Item"

Is it possible to create a class in .NET 4 with:

  1. an indexer,
  2. a property named "Item"?

For example, this C# class will not compile for me:

public class MyClass
{
    public object Item { get; set; }
    public object this[string index] { get { return null; } set { } }
}

The compiler gives an error CS0102:

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

although I am only explicitly defining Item once.

Upvotes: 32

Views: 16277

Answers (3)

Danny Tuppeny
Danny Tuppeny

Reputation: 42333

C# internally creates a property called Item for languages that don't support the indexer. You can control this name using the IndexerNameAttribute, like this:

[IndexerName("MyIndexer")]
public object this[string index]
{
    get { return blah; }
}

Upvotes: 28

Jack Bolding
Jack Bolding

Reputation: 3829

Based on this site, it is possible to use an attribute to rename the Indexer

public class MyClass
{
    public object Item { get; set; }
    [System.Runtime.CompilerServices.IndexerName("MyItem")]
    public object this[string index] { get { return null; } set { } }
}

Upvotes: 44

Hans Kesting
Hans Kesting

Reputation: 39274

If I remember correctly, such an indexer can be accessed from VB.Net through an "Item()" method. That would be where that "defined twice" comes from.

Upvotes: 4

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