asp.net防SQL注入参数过滤 狼

// <summary>
//当有数据时交时，触发事件
// </summary>
// <param name="sender"> </param>
// <param name="e"> </param>
protected void Application_BeginRequest(Object sender, EventArgs e)
{
//遍历Post参数，隐藏域除外
foreach (string i in this.Request.Form)
{
if (i == "__VIEWSTATE") continue;
this.goErr(this.Request.Form[i].ToString());
}
//遍历Get参数。
foreach (string i in this.Request.QueryString)
{
this.goErr(this.Request.QueryString[i].ToString());

}
}

/// <summary>
///SQL注入过滤
/// </summary>
/// <param name="InText">要过滤的字符串 </param>
/// <returns>如果参数存在不安全字符，则返回true </returns>
public bool SqlFilter(string InText)
{
string word = "and|exec|insert|select|delete|update|chr|mid|master|or|truncate|char|declare|join|cmd";
if (InText == null)
return false;
foreach (string i in word.Split('|'))
{
if ((InText.ToLower().IndexOf(i + " ") > -1) || (InText.ToLower().IndexOf(" " + i) > -1))
{
return true;
}
}
return false;
}

/// <summary>
/// 校验参数是否存在SQL字符
/// </summary>
/// <param name="tm"> </param>
private void goErr(string tm)
{
if (SqlFilter(tm))
{
Response.Write(" <script>window.alert('您输入的数据存在有误参数!');" + " </" + "script>");
}
}