相关疑难解决方法(0)

在这样的字典中:

Dictionary<string, string> openWith = new Dictionary<string, string>();

openWith.Add("txt", "notepad.exe");
openWith.Add("bmp", "paint.exe");
openWith.Add("dib", "paint.exe");
openWith.Add("rtf", "wordpad.exe");

Console.WriteLine("For key = \"rtf\", value = {0}.", openWith["rtf"]);

输出是:

对于Key ="rtf"value = wordpad.exe

什么{0}意思？