C-Sharp (C#) Group: Express the property "string this" in an interface

I would like to place this property in an interface

.....
     public string this[string key]
          { get { return .... } }


----

Is that possible to do in an interface? The compiler gets
hung up on
the keyword this on the variations I have tried....


advTHANKSance


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interface IInterface
{
  string this[string key]
  {
     get;
     set;
   }
}


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