C# command to get struct offset?

Question

Suppose I have a C# struct like this:

[StructLayout(LayoutKind.Explicit)]
struct IMAGE_DOS_HEADER {
    [FieldOffset(60)] public int e_lfanew;
}

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Answer 1

Use Marshal.OffsetOf:

Marshal.OffsetOf(typeof(IMAGE_DOS_HEADER), "e_lfanew")