过滤网址和输入框中的特殊字符，防止sql注入代码,CSharp代码库,德仔网

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【CSharp】过滤网址和输入框中的特殊字符，防止sql注入

作者:Dezai.CN / 发布于2012/2/20/ 622

在web.config中添加以下：

<div>using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;</div>
<div>/// <summary>
///cedar 的摘要说明
/// </summary>
public class cedar:IHttpModule
{
public cedar()
{
//
//TODO: 在此处添加构造函数逻辑
//
}
 public void Dispose()
 {</div>
<div> }
<div> public void Init(HttpApplication application)
 {
 application.AcquireRequestState += new EventHandler(application_AcquireRequestState);
 }
 private void application_AcquireRequestState(object sender, EventArgs e)
 {
 HttpContext content = ((HttpApplication)sender).Context;
 try
 {
 string sqlErrorPage = "default.html";//转到默认页面
 string keyValue = string.Empty;
 string requestUrl = content.Request.Path.ToString();
 if (content.Request.QueryString != null)
 {
 foreach (string val in content.Request.QueryString)
 {
 keyValue= content.Server.UrlDecode(content.Request.QueryString[val]);
 if (!processSqlStr(keyValue))
 {
 content.Response.Write("您访问的页面发生错误，此问题我们已经记录并尽快改善，请稍后再试。<a href=""+sqlErrorPage+"" mce_href=""+sqlErrorPage+"">转到首页</a>");
 content.Response.End();
 break;
 }
 }
 }
 if (content.Request.Form != null)
 {
 foreach(string val in content.Request.Form)
 {
 keyValue = content.Server.HtmlDecode(content.Request.Form[val]);
 if (keyValue == "_ViEWSTATE") continue;
 if (!processSqlStr(keyValue))
 {
 content.Response.Write("您访问的页面发生错误，此问题我们已经记录并尽快改善，请稍后再试。");
 content.Response.End();
 break;
 }
 }
 }
 }
 catch (Exception ex)
 {
 }
 }
 private bool processSqlStr(string str)
 {
 bool returnValue = true;
 try
 {
 if (str.Trim() != "")
 {
 //取得webconfig中过滤字符串
 string sqlStr = ConfigurationManager.AppSettings["FilterSql"].Trim();
 //string sqlStr = "declare |exec|varchar |cursor |begin |open |drop |creat |select |truncate";
 string[] sqlStrs = sqlStr.Split('|');
 foreach (string ss in sqlStrs)
 {
 if (str.ToLower().IndexOf(ss) >= 0)
 {
 sqlStr = ss;
 returnValue = false;
 break;
 }
 }
 }
 }
 catch
 {
 returnValue = false;
 }
 return returnValue;
 }
}
</div>

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　防止sql注入　

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