判断是否为ID串

/// <summary>
/// 判断是否为ID串。
/// </summary>
/// <example>
/// 1,2,3,4,5,6,7
/// </example>
/// <param name="intList">要判断的字符串</param>
/// <returns></returns>
        public static bool IsIntParamsString(string paramsString)
        {
if (string.IsNullOrEmpty(paramsString) || paramsString.StartsWith(Separator) || paramsString.EndsWith(Separator))
            {
return false;
            }
bool flag = false;
char separator = Separator[0];
for (int i = 0; i < paramsString.Length; i++)
            {
char c = paramsString[i];
if (c >= '0' && c <= '9')
                {
                    flag = false;
                }
else if (c == separator)
                {
if (flag)
                    {
return false;
                    }
else
                    {
                        flag = true;
                    }
                }
else
                {
return false;
                }
            }
return true;
        }