Compiler Error C3624

  • Article

'type': use of this type requires a reference to assembly 'assembly'

An assembly (reference) needed to compile your code was not specified; pass the assembly to the #using directive.

The following sample generates C3624:

// C3624.cpp
// compile with: /clr /c
#using <System.Windows.Forms.dll>

// Uncomment the following 2 lines to resolve.
// #using <System.dll>
// #using <System.Drawing.dll>

using namespace System;

public ref class MyForm : public Windows::Forms::Form {};   // C3624

The following sample generates C3624:

// C3624_b.cpp
// compile with: /clr:oldSyntax /c
#using <System.Windows.Forms.dll>

// Uncomment the following 2 lines to resolve.
// #using <System.dll>
// #using <System.Drawing.dll>

using namespace System;

public __gc class MyForm : public Windows::Forms::Form {};   // C3624