C#检测是否有危险字符的SQL字符串过滤方法

public static bool ProcessSqlStr(string Str)
{
  bool ReturnValue = true;
  try
  {
    if (Str.Trim() != "")
    {
      string SqlStr = "exec|insert+|select+|delete|update|count|chr|mid|master+|truncate|char|declare|drop+|drop+table|creat+|create|*|iframe|script|";
      SqlStr += "exec+|insert|delete+|update+|count(|count+|chr+|+mid(|+mid+|+master+|truncate+|char+|+char(|declare+|drop+table|creat+table";
      string[] anySqlStr = SqlStr.Split('|');
      foreach (string ss in anySqlStr)
      {
        if (Str.ToLower().IndexOf(ss) >= 0)
        {
          ReturnValue = false;
          break;
        }
      }
    }
  }
  catch
  {
    ReturnValue = false;
  }
  return ReturnValue;
}

/// <summary>
/// 检测是否有Sql危险字符
/// </summary>
/// <param name="str">要判断字符串</param>
/// <returns>判断结果</returns>
public static bool IsSafeSqlString(string str)
{
  return !Regex.IsMatch(str, @"[-|;|,|\/|\(|\)|\[|\]|\}|\{|%|@|\*|!|\']");
}
/// <summary>
/// 改正sql语句中的转义字符
/// </summary>
public static string mashSQL(string str)
{
  string str2;
  if (str == null)
  {
    str2 = "";
  }
  else
  {
    str = str.Replace("\'", "'");
    str2 = str;
  }
  return str2;
}