Marshal.ReadInt32 等与不安全上下文和指针有何不同？
特别是：元帅安全吗？指针更快吗？
int pixel = Marshal.ReadInt32(bitmapData.Scan0, x * 4 + y * bitmapData.Stride);
int pixel = ((int*)bitmapData.Scan0)[x + y * bitmapData.Stride / 4];
Particularly: Is Marshal safer? Are pointers faster?
int pixel = Marshal.ReadInt32(bitmapData.Scan0, x * 4 + y * bitmapData.Stride);
int pixel = ((int*)bitmapData.Scan0)[x + y * bitmapData.Stride / 4];
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评论（2）
没有什么区别。如果您查看
Marshal.ReadInt32中的代码，您会发现它使用指针来执行相同的操作。Marshal的唯一“好处”是您不必显式允许不安全代码。 IIRC，您还需要 FullTrust 才能运行不安全的代码，因此这可能是一个考虑因素。There is no difference. If you look at the code from
Marshal.ReadInt32you will see it uses pointers to perform the same thing.The only 'benefit' with
Marshalis that you not have to explicitly allow unsafe code. IIRC, you also require FullTrust to run unsafe code, so that may be a consideration.我个人更喜欢使用
Marshal主要是因为我避开不安全的代码。至于哪个更快，我不确定，但我确信无论你怎么做，逐像素操作都可能会很慢。更好的方法是将整个扫描线读入 C# 数组并对其进行处理。I personally prefer using
Marshalmostly because I shun unsafe code. As to which is faster, I'm not sure but I am certain that operating pixel by pixel is liable to be slow however you do it. Much better is to read an entire scanline into a C# array and work on that.