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Compiler Error CS0208

Visual Studio 2008

Updated: October 2008

Cannot take the address of, get the size of, or declare a pointer to a managed type ('type')

Even when used with the unsafe keyword, taking the address of a managed object, getting the size of a managed object, or declaring a pointer to a managed type is not allowed. A managed type is:

  • any reference type

  • any struct that contains a reference type as a field or property

For more information, see Unsafe Code and Pointers (C# Programming Guide) and sizeof.

The following sample generates CS0208:

// CS0208.cs
// compile with: /unsafe

class myClass
    public int a = 98;

struct myProblemStruct
    string s;
    float f;

struct myGoodStruct
    int i;
    float f;

public class MyClass
    unsafe public static void Main()
        // myClass is a class, a managed type.
        myClass s = new myClass();  
        myClass* s2 = &s;    // CS0208

        // The struct contains a string, a managed type.
        int i = sizeof(myProblemStruct); //CS0208
        // The struct contains only value types.
        i = sizeof(myGoodStruct); //OK




October 2008

Added text and new code example.

Customer feedback.