更快的方式来操作mutli字节数组

我有这个:

var data = new byte[100,100,1];

//data is populated from external source

for (var h = 0; h <100 ; h++)
{
    for (var w = 0; w <100; w++)
    {
        if (Data[h, w, 0] > 10)
        {
            Data[h, w, 0] = 255;
        }
    }
}

而我只是说如果值大于10然后将其更改为255.

但是,它很慢.

有没有更快的方法来做到这一点？

你也可以将它unsafe和指针混合使用.但是,你需要跳过几个箍.它应该在发布模式下使用指针给你一点性能

// p is because you cant used fixed in a lambda
public static unsafe byte* p;

// AggressiveInlining to compile in line if possible
[MethodImpl(MethodImplOptions.AggressiveInlining)]
public static unsafe void DoOp(int i)
{
   if (*(p + i) > 10) *(p + i) = 255;
}

public static unsafe void Main()
{
   int x = 10, y = 10, z = 1;  
   var data = new byte[x, y, z];

   fixed (byte* pbytes = data)
   {
      p = pbytes;
      Parallel.For(0, x * y,
         new ParallelOptions() { MaxDegreeOfParallelism = Environment.ProcessorCount},
         DoOp);
   }
}