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Compiler Error CS0842

Visual Studio 2008

Automatically implemented properties cannot be used inside a type marked with StructLayout(LayoutKind.Explicit).

Auto-implemented properties have their backing fields provided by the compiler and the field is not accessible to source code. Therefore, they are not compatible with LayoutKind.Explicit.

To correct this error

  • Make the property a regular property in which you provide the accessor bodies.

The following example generates CS0842:

// cs0842.cs
using System;
using System.Runtime.InteropServices;

namespace TestNamespace
    struct Str
        public int Num // CS0842

        static int Main()
            return 1;

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