public class SqlFilter
{
 public static void Filter()
 {
 string fileter_sql = "execute,exec,select,insert,update,delete,create,drop,alter,exists,table,sysobjects,truncate,union,and,order,xor,or,mid,cast,where,asc,desc,xp_cmdshell,join,declare,nvarchar,varchar,char,sp_oacreate,wscript.shell,xp_regwrite,',%,;,--";
 try
 {
 // -----------------------防 Post 注入-----------------------
 if (HttpContext.Current.Request.Form != null)
 {
 PropertyInfo isreadonly = typeof(System.Collections.Specialized.NameValueCollection).GetProperty("IsReadOnly", BindingFlags.Instance | BindingFlags.NonPublic);
 //把 Form 屬性改為可讀寫
 isreadonly.SetValue(HttpContext.Current.Request.Form, false, null);

 for (int k = 0; k < System.Web.HttpContext.Current.Request.Form.Count; k++)
 {
 string getsqlkey = HttpContext.Current.Request.Form.Keys[k];
 string sqlstr = HttpContext.Current.Request.Form[getsqlkey];
 string[] replace_sqls = fileter_sql.Split(',');
 foreach (string replace_sql in replace_sqls)
 {
 sqlstr = Regex.Replace(sqlstr, replace_sql, "", RegexOptions.IgnoreCase);
 }
 HttpContext.Current.Request.Form[getsqlkey] = sqlstr;
 }
 }


 // -----------------------防 GET 注入-----------------------
 if (HttpContext.Current.Request.QueryString != null)
 {
 PropertyInfo isreadonly = typeof(System.Collections.Specialized.NameValueCollection).GetProperty("IsReadOnly", BindingFlags.Instance | BindingFlags.NonPublic);
 //把 QueryString 屬性改為可讀寫
 isreadonly.SetValue(HttpContext.Current.Request.QueryString, false, null);

 for (int k = 0; k < System.Web.HttpContext.Current.Request.QueryString.Count; k++)
 {
 string getsqlkey = HttpContext.Current.Request.QueryString.Keys[k];
 string sqlstr = HttpContext.Current.Request.QueryString[getsqlkey];
 string[] replace_sqls = fileter_sql.Split(',');
 foreach (string replace_sql in replace_sqls)
 {
 sqlstr = Regex.Replace(sqlstr, replace_sql, "", RegexOptions.IgnoreCase);
 }
 HttpContext.Current.Request.QueryString[getsqlkey] = sqlstr;
 }
 }


 // -----------------------防 Cookies 注入-----------------------
 if (HttpContext.Current.Request.Cookies != null)
 {
 PropertyInfo isreadonly = typeof(System.Collections.Specialized.NameValueCollection).GetProperty("IsReadOnly", BindingFlags.Instance | BindingFlags.NonPublic);
 //把 Cookies 屬性改為可讀寫
 isreadonly.SetValue(HttpContext.Current.Request.Cookies, false, null);

 for (int k = 0; k < System.Web.HttpContext.Current.Request.Cookies.Count; k++)
 {
 string getsqlkey = HttpContext.Current.Request.Cookies.Keys[k];
 string sqlstr = HttpContext.Current.Request.Cookies[getsqlkey].Value;
 string[] replace_sqls = fileter_sql.Split(',');
 foreach (string replace_sql in replace_sqls)
 {
 sqlstr = Regex.Replace(sqlstr, replace_sql, "", RegexOptions.IgnoreCase);
 }
 HttpContext.Current.Request.Cookies[getsqlkey].Value = sqlstr;
 }
 }
 }
 catch (Exception ex)
 {
 Console.WriteLine(ex.Message);
 }

 }

}