Question

I have a generic class of

public class Mapper<K, L, V> : Dictionary<K, V>

When I instantiate it as

Mapper<string, string, MapSource> Map= new Mapper<string, string, MapSource>();

and try and do

Map["..."].

is comes back with compiler error message of

The call is ambiguous between the following methods or properties: ‘MinorTesting.XML.Sourcer.Mapper.this[L]’ and ‘MinorTesting.XML.Sourcer.Mapper.this[K]’

How would I fix this to remove the compile .

Bob.

Answer 1

What does MultiKeyDictionary look like and where/how is it used?

It looks like MultiKeyDictionary provides two indexers, this[L] and this[K]. When L and K are the same then the compiler is unable to choose between those indexers because they’ve effectively both become this[string].

One option would be to provide explicit methods to use in place of the indexer in this case: for example, GetByKey(K) and GetByValue(L) or similar.