js字符串编码与c#字符解码，简易版

jnsimcode.cs

//2017-5-15 ijunxiong@126.com

String.prototype.padLeft = function (len, char) {
    var s = this;
    for (var i = 0; i < len - this.length; i++) {
        s = char + s;
    }
    return s;
}

var jnsimcode = new (function () {
    this.encode = function (str) {
        if (str === "")
            return "";
        var hexCharCode = [];
        for (var i = 0; i < str.length; i++) {
            hexCharCode.push((str.charCodeAt(i)).toString(16).padLeft(4, '0'));
        }
        return hexCharCode.join("");
    }
    this.decode = function (rawStr) {
        var len = rawStr.length;
        if (len % 4 !== 0) {
            //alert("Illegal Format ASCII Code!");
            return "";
        }
        var curCharCode = 0;
        var resultStr = [];
        for (var i = 0; i < len; i += 4) {
            curCharCode = parseInt(rawStr.substr(i, 4), 16);
            resultStr.push(String.fromCharCode(curCharCode));
        }
        return resultStr.join("");
    }
})();

　　

JnSimCode.cs

    //ijunxiong@126.com
    public class JnSimCode
    {
        public static string Decode(string rawStr)
        {
            int len = rawStr.Length;
            if (len % 4 != 0)
            {
                return "error!";
            }
            int curCharCode = 0;
            List<string> resultStr = new List<string>();
            for (int i = 0; i < len; i += 4)
            {
                curCharCode = Convert.ToInt32(rawStr.Substring(i, 4), 16);
                resultStr.Add(Convert.ToString((char)curCharCode));
            }
            return string.Concat(resultStr).Replace("\n", "\r\r").Replace("\r\r", "\r\n");
        }
    }

　　

 原理：

js，把字符串，每个字符都理解为四字节，之后再16进制编码，即用FFFF表示一个字符，当然这样长度就变得比较长了，但可以解决js交互net服务时的转码乱码问题，