Compiler Error CS0212
You can only take the address of an unfixed expression inside of a fixed statement initializer
For more information, see Unsafe Code and Pointers.
The following sample shows how to take the address of an unfixed expression. The following sample generates CS0212.
// CS0212a.cs
// compile with: /unsafe /target:library
public class A {
public int iField = 5;
unsafe public void M() {
A a = new A();
int* ptr = &a.iField; // CS0212
}
// OK
unsafe public void M2() {
A a = new A();
fixed (int* ptr = &a.iField) {}
}
}
The following sample also generates CS0212 and shows how to resolve the error:
// CS0212b.cs
// compile with: /unsafe /target:library
using System;
public class MyClass
{
unsafe public void M()
{
// Null-terminated ASCII characters in an sbyte array
sbyte[] sbArr1 = new sbyte[] { 0x41, 0x42, 0x43, 0x00 };
sbyte* pAsciiUpper = &sbArr1[0]; // CS0212
// To resolve this error, delete the previous line and
// uncomment the following code:
// fixed (sbyte* pAsciiUpper = sbArr1)
// {
// String szAsciiUpper = new String(pAsciiUpper);
// }
}
}
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