C＃Marshal.Copy Intptr到16位托管无符号整数数组
为什么C＃Marshal.Copy例程没有任何重载从非托管内存指针复制到16位托管无符号整数数组？
例如：
Copy(IntPtr, Byte[], Int32, Int32) Copies data from an unmanaged memory pointer to a managed 8-bit unsigned integer array. Copy(IntPtr, Char[], Int32, Int32) Copies data from an unmanaged memory pointer to a managed character array. Copy(IntPtr, Double[], Int32, Int32) Copies data from an unmanaged memory pointer to a managed double-precision floating-point number array. Copy(IntPtr, Int16[], Int32, Int32) Copies data from an unmanaged memory pointer to a managed 16-bit signed integer array. Copy(IntPtr, Int32[], Int32, Int32) Copies data from an unmanaged memory pointer to a managed 32-bit signed integer array. Copy(IntPtr, Int64[], Int32, Int32) Copies data from an unmanaged memory pointer to a managed 64-bit signed integer array. Copy(IntPtr, IntPtr[], Int32, Int32) Copies data from an unmanaged memory pointer to a managed IntPtr array. Copy(IntPtr, Single[], Int32, Int32). Copies data from an unmanaged memory pointer to a managed single-precision floating-point number array. 如果没有编组替代方法，如何将非托管的ushort数组复制到托管的ushort数组？
使用不安全的代码：
public static unsafe void Copy(IntPtr ptrSource, ushort[] dest, uint elements) { fixed(ushort* ptrDest = &dest[0]) { CopyMemory((IntPtr)ptrDest, ptrSource, elements * 2); // 2 bytes per element } } public static unsafe void Copy(ushort[] source, Intptr ptrDest, uint elements) { fixed(ushort* ptrSource = &source[0]) { CopyMemory(ptrDest, (Intptr)ptrSource, elements * 2); // 2 bytes per element } } [DllImport("kernel32.dll", EntryPoint = "RtlMoveMemory", SetLastError = false)] static extern void CopyMemory(IntPtr Destination, IntPtr Source, uint Length);
可以很容易地适应复制uint []和ulong []（调整每个元素的字节数）
我认为 Marshal没有Copy(IntPtr, UInt16[], Int32, Int32)因CLS合规而过载（CLS合规的原则是无符号整数操作不向消费者公开，我不同意这条规则FWIW）。
通过编组，重要的是元素的大小。 签名只是次要问题。 我会使用Byte或Int16重载并在之后进行自己的转换，或者我会使用不安全的指针。
IntPtr unmanagedArray = ... Int16[] destination0 = new Int16[ count ]; Marshal.Copy( unmanagedArray, destination0, 0, count ); UInt16[] destinion1 = destination0.OfType().ToArray(); // Linq extension method
可能是因为并非所有托管语言都有无符号类型。 我不认为这是一个很好的理由，但这是一个合理的解释。
强制转换应该在无符号数组参数之前工作。
Copy(addr, (Int16[])someUnsignedArray, 0, len);