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Compiler Error CS0227

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Unsafe code may only appear if compiling with /unsafe

If source code contains the unsafe keyword, then the /unsafe compiler option must also be used. For more information, see Unsafe Code and Pointers (C# Programming Guide).

To set the unsafe option in Visual Studio 2008, click on Project in the main menu, select the Build pane, and check the box that says "allow unsafe code."

The following sample, when compiled without /unsafe, will generate CS0227:

// CS0227.cs
public class MyClass
{
   unsafe public static void Main()   // CS0227
   {
   }
}

See Also

Other Resources

C# Compiler Errors and Warnings

Change History

Date

History

Reason

August 2008

Added information on how to set the unsafe option in Visual Studio.

Customer feedback.