Use local variables wisely when calling anonymous functions asynchronously

Problem: Bugs caused by using local variables outside of anonymous functions in multiple threads

Executing code

static　void　Main(string[]　args)
{
　　　　for　(int　i　=　0;　i　<　10;　i++)
　　　　{
　　　　　　　　Thread　t　=　new　Thread(delegate()
　　　　　　　　{
　　　　　　　　　　　　Thread.Sleep(new　Random().Next(1,　10000));
　　　　　　　　　　　　Console.Write(i　+　",　");
　　　　　　　　});
　　　　　　　　t.Start();
　　　　}
}

Will get output: 10, 10, 10, 10, 10, 10, 10, 10, 10, 10,

Rather than what we expect: 3, 5, 6, 1, 0, 7, 9, 8, 4, 2, such output. What is this for? (See the code for this bug in the actual project please refer to [1])

Analysis: Using reflector to view compiled code

The following is a code comparison before and after compilation. (Refer to [2] for specific methods of using reflector, here only show results)