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Here’s a quick example of the DllImport attribute in action:
using System.Runtime.InteropServices; \
class C
{
[DllImport(\"user32.dll\")]
public static extern int MessageBoxA(int h, string m, string c, int type);
public static int Main()
{
return MessageBoxA(0, \"Hello World!\", \"Caption\", 0);
}
}
This example shows the minimum requirements for declaring a C# method that is implemented in a native DLL. The
method C.MessageBoxA() is declared with the static and external modifiers, and has the DllImport attribute, which
tells the compiler that the implementation comes from the user32.dll, using the default name of MessageBoxA. For
more information, look at the Platform Invoke tutorial in the documentation.
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