Why C# change my color structure to ValueType?

问题

I have defined following code in C++ CLI.
However when I want to call SetColor the first parameter which is supposed to appear as System.Drawing.Color; appears as ValueType.
This also let me to pass any variable into it. No matter if it's Color or not.

[System::Runtime::CompilerServices::ExtensionAttribute]
public ref class MyExtensions abstract sealed {
public:        
    [System::Runtime::CompilerServices::ExtensionAttribute]
    static System::String^ SetColor(System::String^ in, System::Drawing::Color^ ext) {
        return gcnew System::String("{") +
            ext->R.ToString("X") + ext->G.ToString("X") + ext->B.ToString("X")
            + gcnew System::String("}")  + in;
    }        
};

回答1:

Color is a struct. Remove the ^ from the parameter System::Drawing::Color^ ext.

Also, gcnew System::String("{") is redundant. Just use "{" directly, it's already a String object.

来源：https://stackoverflow.com/questions/15419974/why-c-sharp-change-my-color-structure-to-valuetype