快速字符串到字节[]的转换 [英] Fast string to byte[] conversion

问题描述

当前，我正在使用以下代码将字符串转换为字节数组：

Currently I am using this code for converting string to byte array:

var tempByte = System.Text.Encoding.UTF8.GetBytes(tempText);

我在我的应用程序中经常调用这一行，我真的想使用更快的一行。如何比默认的GetBytes方法更快地将字符串转换为字节数组？也许使用了不安全的代码？

I call this line very often in my application, and I really want to use a faster one. How can I convert a string to a byte array faster than the default GetBytes method? Maybe with an unsafe code?

推荐答案

如果您不太在意使用特定的编码，并且您的代码对性能至关重要（例如，它是某种数据库序列化程序，需要每秒运行数百万次），请尝试

If you don't care too much about using specific encoding and your code is performance-critical (for instance it's some kind of DB serializer and needs to be run millions of times per second), try

fixed (void* ptr = tempText)
{
    System.Runtime.InteropServices.Marshal.Copy(new IntPtr(ptr), tempByte, 0, len);
}

编辑：元帅.Copy 比 UTF8.GetBytes 快十倍，并且可以使用UTF-16编码。要将其转换回字符串，可以使用：

Edit: Marshal.Copy was around ten times faster than UTF8.GetBytes and gets you UTF-16 encoding. For converting it back to string you can use:

fixed (byte* bptr = tempByte)
{
    char* cptr = (char*)(bptr + offset);
    tempText = new string(cptr, 0, len / 2);
}

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