IntPtr.ToInt32() 在 64 位机器上抛出异常,但 IntPtrToInt64() 会在 32 位机器上抛出异常吗?

IntPtr.ToInt32() throws excption on 64bit, but will IntPtrToInt64() throw on 32bit machine?

我有这个代码:

if (hnd == IntPtr.Zero || hnd.ToInt32() == -1)

hnd 是一个 IntPtr

这个抛出OverflowException,所以我修改为

 if (hnd == IntPtr.Zero || hnd.ToInt64() == -1)

文档说 ToInt32 可以抛出异常,但 ToInt64 不能(?)。

  //
// Summary:
//     Converts the value of this instance to a 32-bit signed integer.
//
// Returns:
//     A 32-bit signed integer equal to the value of this instance.
//
// Exceptions:
//   T:System.OverflowException:
//     On a 64-bit platform, the value of this instance is too large or too small to
//     represent as a 32-bit signed integer.
[ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
[SecuritySafeCritical]
[TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")]
public int ToInt32();
//
// Summary:
//     Converts the value of this instance to a 64-bit signed integer.
//
// Returns:
//     A 64-bit signed integer equal to the value of this instance.
[ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
[SecuritySafeCritical]
[TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")]
public long ToInt64();

所以问题: hnd.ToInt64() 是否会在 32 位机器上抛出异常?

documentation 指出:

An instance of this type is expected to be 32-bits on 32-bit hardware and operating systems, and 64-bits on 64-bit hardware and operating systems

所以:

  • 在 64 位 OS 上,IntPtr 可以从 Int64.MinValue 变为 Int64.MaxValue。显然,转换为 Int32 时可能会引发溢出,因为范围更长。
  • 在 32 位 OS 上,IntPtr 可以从 Int32.MinValue 变为 Int32.MaxValue,因此您可以将其转换为 Int64Int32,因为该值将始终在范围内。