Generic conversion function doesn't seem to work with Guids

Question

I have the following code:

public static T ParameterFetchValue<T>(string parameterKey) {     Parameter result = null;      result = ParameterRepository.FetchParameter(parameterKey);      return (T)Convert.ChangeType(result.CurrentValue, typeof(T), CultureInfo.InvariantCulture);   } 

The type of result.CurrentValue is string. I would like to be able to convert it to Guid but I keep getting the error:

Invalid cast from System.String to System.Guid

This works perfectly with primitive data types.
Is there any way to make this work for non-primitive data types?

Answer 1

How about:

T t = (T)TypeDescriptor.GetConverter(typeof(T)).ConvertFromInvariantString(text); 

Works fine for Guid and most other types.