c# - 需要帮助从c中的并集转换为C#

Possible Duplicate:
C++ union in C#




C中的代码：

typedef struct _EVENT_HEADER {
USHORT              Size;                   // Event Size
USHORT              HeaderType;             // Header Type
USHORT              Flags;                  // Flags
USHORT              EventProperty;          // User given event property
ULONG               ThreadId;               // Thread Id
ULONG               ProcessId;              // Process Id
LARGE_INTEGER       TimeStamp;              // Event Timestamp
GUID                ProviderId;             // Provider Id
EVENT_DESCRIPTOR    EventDescriptor;        // Event Descriptor
union {
    struct {
        ULONG       KernelTime;             // Kernel Mode CPU ticks
        ULONG       UserTime;               // User mode CPU ticks
    } DUMMYSTRUCTNAME;
    ULONG64         ProcessorTime;          // Processor Clock
                                            // for private session events
} DUMMYUNIONNAME;
GUID                ActivityId;             // Activity Id

} EVENT_HEADER, *PEVENT_HEADER;

除了工会我什么都没做。如何将其转换为C＃？

最佳答案

C＃本身不支持联合的C / C ++概念。但是，您可以使用StructLayout（LayoutKind.Explicit）和FieldOffset属性来创建等效功能。

关于union：在下面的代码中，您可以看到Kernel和ProcessorTime具有相同的偏移量。 LargeInteger也是C＃中联合实现的一个很好的例子。

事件头

[StructLayout(LayoutKind.Explicit)]
public struct EventHeader
{
    [FieldOffset(0)]
    public ushort Size;

    [FieldOffset(2)]
    public ushort HeaderType;

    [FieldOffset(4)]
    public ushort Flags;

    [FieldOffset(6)]
    public ushort EventProperty;

    [FieldOffset(8)]
    public uint ThreadId;

    [FieldOffset(12)]
    public uint ProcessId;

    [FieldOffset(16)]
    public LargeInteger TimeStamp;

    [FieldOffset(24)]
    public Guid ProviderId;

    [FieldOffset(40)]
    public Guid EventDescriptor;

    [FieldOffset(52)]
    public uint KernelTime;

    [FieldOffset(56)]
    public uint UserTime;

    [FieldOffset(52)]
    public ulong ProcessorTime;

    [FieldOffset(60)]
    public Guid ActivityId;
}

大整数

[StructLayout(LayoutKind.Explicit, Size = 8)]
public struct LargeInteger
{
    [FieldOffset(0)]
    public long QuadPart;

    [FieldOffset(0)]
    public uint LowPart;

    [FieldOffset(4)]
    public uint HighPart;
}

事件描述符

[StructLayout(LayoutKind.Sequential)]
public struct EventDescriptor
{
    public ushort Id;

    public byte Level;

    public byte Channel;

    public byte LevelSeverity;

    public byte Opcode;

    public ushort Task;

    public uint Keyword;
}

免责声明：我刚刚编写了这段代码。没有测试。该代码可能有错误。

关于c# - 需要帮助从c中的并集转换为C#，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/6323287/