.Net分享两个隐藏字符串的方法

JS的方法

/*隐藏部分字符
*@str 原字符串
*@startIndex 开始索引
*@length 隐藏长度
*@replaceChar 替换字符
*/
function hiddenChar(str, startIndex, length, replaceChar) {
    var str_start = "";
    var str_end = "";
    var str_middle = "";
    var str_length = str.length;
    var replace_length = length;
    if (startIndex > 0)
        str_start = str.substr(0, startIndex);
    if (startIndex + replace_length < str_length)
        str_end = str.substring(startIndex + replace_length);
    if (startIndex + replace_length > str_length)
        replace_length = str_length - startIndex;
    for (var i = 0; i < replace_length; i++) {
        str_middle += replaceChar;
    }

    str = str_start + str_middle + str_end;
    return str;
}

/// <summary>
        /// 隐藏部分字符串
        /// </summary>
        /// <param name="source">原字符串</param>
        /// <param name="startIndex">开始隐藏位置</param>
        /// <param name="length">隐藏长度</param>
        /// <param name="replaceChar">替换符</param>
        /// <returns></returns>
        public static string HiddenPortion(string source, int startIndex, int length, string replaceChar)
        {
            string result = null;
            string str_start = null;
            string str_end = null;
            string str_middle = null;
            int str_length = source.Length;
            int replace_length = length;

            if (startIndex >= str_length)
                startIndex = str_length;
            if (startIndex > 0)
                str_start = source.Substring(0, startIndex);
            if (startIndex + replace_length < str_length)
                str_end = source.Substring(startIndex + replace_length, str_length - startIndex - replace_length);
            if (startIndex + replace_length > str_length)
                replace_length = str_length - startIndex;

            for (var i = 0; i < replace_length; i++)
            {
                str_middle += replaceChar;
            }
            result = str_start + str_middle + str_end;
            return result;
        }

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