String扩展 让你在PadLeft和PadRight时不再受单双字节问题困扰

因为在NET中，string的Length并不区分当前字符串包含的字符为单字节还是双字节字符，这样导致我们在通过字符串的PadLeft和PadRight方法处理一些需要排版显示的字符串时，会使得相关显示参差不齐，所以这里就有了这么一个扩展，让双字节显示占用的两个单字节宽度“吐”出来，下面是具体代码

    using System.Text.RegularExpressions;    public static class StringExtensions    {        /// <summary>        /// 按单字节字符串向左填充长度        /// </summary>        /// <param name="input"></param>        /// <param name="length"></param>        /// <param name="paddingChar"></param>        /// <returns></returns>        public static string PadLeftWhileDouble(this string input, int length, char paddingChar = '\0')        {            var singleLength = GetSingleLength(input);            return input.PadLeft(length - singleLength + input.Length, paddingChar);         }        private static int GetSingleLength(string input)        {            if (string.IsNullOrEmpty(input))            {                throw new ArgumentNullException();            }            return Regex.Replace(input, @"[^\x00-\xff]", "aa").Length;//计算得到该字符串对应单字节字符串的长度        }        /// <summary>        /// 按单字节字符串向右填充长度        /// </summary>        /// <param name="input"></param>        /// <param name="length"></param>        /// <param name="paddingChar"></param>        /// <returns></returns>        public static string PadRightWhileDouble(this string input, int length, char paddingChar = '\0')        {            var singleLength = GetSingleLength(input);            return input.PadRight(length - singleLength + input.Length, paddingChar);        }    }

测试代码如下

            Console.WriteLine("123测试测试".PadRightWhileDouble(25) + "1");            Console.WriteLine("123测试测试".PadRightWhileDouble(25, 'A') + "1");            Console.WriteLine("1231212".PadRightWhileDouble(25) + "1");            Console.WriteLine("1231212".PadRightWhileDouble(25, 'A') + "1");            Console.WriteLine("123测试测试".PadLeftWhileDouble(25) + "1");            Console.WriteLine("123测试测试".PadLeftWhileDouble(25, 'A') + "1");            Console.WriteLine("1231212".PadLeftWhileDouble(25) + "1");            Console.WriteLine("1231212".PadLeftWhileDouble(25, 'A') + "1");

测试效果图