/// <summary>
/// 将传入的字符串中间部分字符替换成特殊字符
/// </summary>
/// <param name="value">需要替换的字符串</param>
/// <param name="startLen">前保留长度</param>
/// <param name="endLen">尾保留长度</param>
/// <param name="replaceChar">特殊字符</param>
/// <returns>被特殊字符替换的字符串</returns>
private static string ReplaceWithSpecialChar(string value, int startLen = 4, int endLen = 4, char specialChar = '*')
{
    try
    {
        int lenth = value.Length - startLen - endLen;
 
        string replaceStr = value.Substring(startLen, lenth);
 
        string specialStr = string.Empty;
 
        for (int i = 0; i < replaceStr.Length; i++)
        {
            specialStr += specialChar;
        }
 
        value = value.Replace(replaceStr, specialStr);
    }
    catch (Exception)
    {
        throw;
    }
 
    return value;
}