C# Left, Right and Mid函数

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  class LeftRightMid    {        static void Main(string[] args)        {            string myString = "This is a string";            Console.WriteLine(Left(myString, 4));            Console.WriteLine(Right(myString, 6));            Console.WriteLine(Mid(myString, 5, 4));            Console.WriteLine(Mid(myString, 5));            Console.ReadLine();        }        public static string Left(string param, int length)        {            string result = param.Substring(0, length);            return result;        }        public static string Right(string param, int length)        {            string result = param.Substring(param.Length - length, length);            return result;        }        public static string Mid(string param, int startIndex, int length)        {            string result = param.Substring(startIndex, length);            return result;        }        public static string Mid(string param, int startIndex)        {            string result = param.Substring(startIndex);            return result;        }}

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