Registry of templated types in C#

I have an inte开发者_如何学运维rface IDataStream and different implementations of it (i.E. DataStream<T>).

I need to make a class DataStreamManager which has a registry functionality (Find(Key)) for all DataStreams cuttently available (meaning, the registry should contain refs to DataStream<int>, DataStream<SomeObject>...), and the DataStreamManager must be singleton.

Does anyone have an idea how to make such a registry in C#?

You can leverage IDictionary<TKey, TValue> for this purposes:

Te question is what would be a Key to identify a concrete data stream?

public sealed class DataStreamManager
{

  var dataStreamsMap = new Dictionary<Type, IDataStream>
    {
        { typeof(int), new DataStream<int>() }
    }

  public IDataStream Get<T>()
  {
    IDataStream dataStream = null;
    Type key = typeof(T);
    if (dataStreamsMap.Contains(key))
    {
       dataStream = dataStreamsMap[key];
    }

    return dataStream;
  }
}

And then use it:

var manager = new DataStreamManager();
var dataStream = manager.Get<int>();