C#编组结构指针有什么区别？

好的,这是有效的：

[StructLayout(LayoutKind.Explicit,Size = 28)]
public unsafe struct HandleProxy
{
    [FieldOffset(0),MarshalAs(UnmanagedType.I4)]
    public JSValueType _ValueType; // JSValueType is an enum

    [FieldOffset(4),MarshalAs(UnmanagedType.I4)]
    public Int32 _ManagedobjectID; 

    [FieldOffset(8)]
    public void* _NativeEngineProxy;

    [FieldOffset(16),MarshalAs(UnmanagedType.I4)]
    public Int32 _EngineID;

    [FieldOffset(20)]
    public void* _Handle;
}

[DllImport("Proxy")]
public static extern void disposeHandleProxy(HandleProxy* handle);

……这不……

[StructLayout(LayoutKind.Explicit,Size = 20)]
public unsafe struct ValueProxy
{
    [FieldOffset(0),MarshalAs(UnmanagedType.I4)]
    public JSValueType _ValueType; // 32-bit type value.

    [FieldOffset(4),MarshalAs(UnmanagedType.Bool)]
    public bool _Boolean;

    [FieldOffset(4),MarshalAs(UnmanagedType.I4)]
    public Int32 _Integer;

    [FieldOffset(4)]
    public double _Number;

    [FieldOffset(12)]
    public void* _String;
}

[DllImport("Proxy")]
public static extern void disposeValueProxy(ValueProxy* valueProxy);

那么,有什么区别？我错过了什么.调用“disposeValueProxy()”会出现以下错误：

“无法封送’参数#1’：指针不能引用封送结构.请改用ByRef.”

(是的,我可以简单地使用IntPtr / void *代替“ValueProxy *”但这不是我的观点).

对“disposeHandleProxy()”的调用工作正常.

让我们看看是否有人可以解决这个问题.