Visual C# Language
public virtual T MyMethod<T>()
{
if (typeof (T) != typeof (Collection<string>))
{
return default(T);
}
Collection<string> collection = new Collection<string>();
return (T)collection;
}
This method has the compile error on the red line above:
Cannot convert type 'System.Collections.ObjectModel.Collection<System.String>' to 'T'
Any reasoning would be appreciated.
It is not clear what the purpose of this function is. Could you explain what this method is supposed to do
thm99 wrote:
public virtual T MyMethod<T>()
{
if (typeof (T) != typeof (Collection<string>))
{
return default(T);
}
Collection<string> collection = new Collection<string>();
return (T)collection;
}
This method has the compile error on the red line above:
Cannot convert type 'System.Collections.ObjectModel.Collection<System.String>' to 'T'
Any reasoning would be appreciated.
What's the point of having a generic method if it only allows one type (Collecton<string>) to be used
Anyway, I think you can get it to compile if you write
return (T)(object)collection;
Spot on Mattias but can you explain why I have to cast to object, it doesn't seem necessary
As for the code I posted the method actually uses another type than string and has some more logic but I just wanted to post a simple and concise example of the root problem.
> but can you explain why I have to cast to object, it doesn't seem necessary
You have to cast to object to make obvious that no conversions except implicit/explicit reference conversions are applicable here (particularly, user-defined conversion are not applicable).