asp.net防SQL注入參數過濾

// <summary>
//當有資料時交時，觸發事件
// </summary>
// <param name="sender"> </param>
// <param name="e"> </param>
protected void Application_BeginRequest(Object sender, EventArgs e)
{
//遍曆Post參數，隱藏欄位除外
foreach (string i in this.Request.Form)
{
if (i == "__VIEWSTATE") continue;
this.goErr(this.Request.Form[i].ToString());
}
//遍曆Get參數。
foreach (string i in this.Request.QueryString)
{
this.goErr(this.Request.QueryString[i].ToString());

}
}

/// <summary>
///SQL注入過濾
/// </summary>
/// <param name="InText">要過濾的字串 </param>
/// <returns>如果參數存在Unsafe 字元，則返回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>
/// 校正參數是否存在SQL字元
/// </summary>
/// <param name="tm"> </param>
private void goErr(string tm)
{
if (SqlFilter(tm))
{
Response.Write(" <script>window.alert('您輸入的資料存在有誤參數!');" + " </" + "script>");
}
}