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Compiler Error CS1642

Fixed size buffer fields may only be members of structs.

This error occurs if you use a fixed size buffer field in a class, instead of a struct. To resolve this error, change the class to a struct or declare the field as an ordinary array.

The following sample generates CS1642.

// CS1642.cs
// compile with: /unsafe /target:library
unsafe class C
   fixed int a[10];   // CS1642

unsafe struct D
    fixed int a[10];

unsafe class E
   public int[] a = null;