我已经定义了以下结构来模拟 C++ 联合(最终将用于 C++ 互操作):
[StructLayout(LayoutKind.Sequential)]
internal struct STRUCT1
{
public Guid guid;
public String str1;
public String str2;
}
[StructLayout(LayoutKind.Sequential)]
internal struct STRUCT2
{
public Guid guid;
public String str1;
public String str2;
public Int32 i1;
}
[StructLayout(LayoutKind.Explicit)]
internal struct MASTER_STRUCT_UNION
{
[FieldOffset(0)]
public STRUCT1 Struct1;
[FieldOffset(0)]
public STRUCT2 Struct2;
}
[StructLayout(LayoutKind.Sequential)]
internal struct MASTER_STRUCT
{
public MASTER_STRUCT_UNION Union;
}
我编写了以下测试代码,它为 赋值Struct1.guid
并测试是否相等Struct2.guid
:
class Class1
{
public static void Test()
{
MASTER_STRUCT ms = new MASTER_STRUCT();
bool match;
ms.Union.Struct1.guid = new Guid(0xffeeddcc, 0xbbaa, 0x9988, 0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11, 0);
Console.WriteLine("Struct1.guid:\t\t{0}\n", ms.Union.Struct1.guid.ToString());
Console.WriteLine("Struct2.integer:\t{0:x}", ms.Union.Struct2.i1);
Console.WriteLine("Struct2.guid:\t\t{0}", ms.Union.Struct2.guid.ToString());
match = ms.Union.Struct1.guid == ms.Union.Struct2.guid ? true : false;
}
}
为什么不Struct2.guid
等于Struct1.guid
,而是Struct2.guid
's 的一部分似乎转移到了Struct2.integer
? 所有结构成员,IMO,似乎都是一致的。