string.format中的"和{的输出

@后面的"要用两个即"",{也要用两个{{

//string s=@"{""u"": ""{0}"",""n"": ""{1}"",""t"": ""{3}"",""i"":{2}}";//错误的

            string t = @"{{""{1}"":""{2}""}}";//正确的
            Console.WriteLine(string.Format(t, 1,2,3,4));
            Console.ReadKey();