C# generics when T could be an array

Posted by bufferz on Stack Overflow See other posts from Stack Overflow or by bufferz
Published on 2010-04-21T14:47:51Z Indexed on 2010/04/21 15:03 UTC
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I am writing a C# wrapper for a 3rd party library that reads both single values and arrays from a hardware device, but always returns an object[] array even for one value. This requires repeated calls to object[0] when I'd like the end user to be able to use generics to receive either an array or single value.

I want to use generics so the callee can use the wrapper in the following ways:

MyWrapper<float> mw = new MyWrapper<float>( ... );
float value = mw.Value; //should return float;

MyWrapper<float[]> mw = new MyWrapper<float[]>( ... );
float[] values = mw.Value; //should return float[];

In MyWrapper I have the Value property currently as the following:

public T Value
{
   get
   {
      if(_wrappedObject.Values.Length > 1)
         return (T)_wrappedObject.Value; //T could be float[]. this doesn't compile.
      else
         return (T)_wrappedObject.Values[0]; //T could be float. this compiles.
   }
}

I get a compile error in the first case:

Cannot convert type 'object[]' to 'T'

If I change MyWrapper.Value to T[] I receive:

Cannot convert type 'object[]' to 'T[]'

Any ideas of how to achieve my goal? Thanks!

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