SQL防注入

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Text.RegularExpressions;

/// <summary>
///SQLInjectionHelper 的摘要说明
/// </summary>
public class SQLInjectionHelper
{
    public SQLInjectionHelper()
    {
        //
        //TODO: 在此处添加构造函数逻辑
        //
    }

    /// <summary>
    /// 验证请求数据
    /// </summary>
    public static bool ValidUrlData(String request)
    {
        bool result = false;
        //获取Post的数据
        if (request == "POST")
        {
            for (int i = 0; i < HttpContext.Current.Request.Form.Count; i++)
            {
                result = ValidData(HttpContext.Current.Request.Form[i].ToString().ToLower());
                if (result)
                {
                    break;
                }
            }
        }
        else //获取QueryString中的数据
        {
            for (int i = 0; i < HttpContext.Current.Request.QueryString.Count; i++)
            {
                result = ValidData(HttpContext.Current.Request.QueryString[i].ToString().ToLower());
                if (result)
                {
                    break;
                }
            }
        }

        return result;
    }

    /// <summary>
    /// 验证是否存在注入代码
    /// </summary>
    /// <param name="inputData">输入字符</param>
    /// <returns></returns>
    private static bool ValidData(String inputData)
    {
        //验证inputData是否包含恶意集合
        if (Regex.IsMatch(inputData, GetRegexString()))
        {
            return true;
        }
        else
        {
            return false;
        }
    }

    /// <summary>
    /// 获取正则表达式
    /// </summary>
    private static String GetRegexString()
    {
        //构造SQL的注入关键字符
        String[] strBadChar = {"and","exec","insert","select","delete","update","count","from",
                              "drop","asc","char","or","%",";",":","\'","\"","-","chr","mid","master",
                              "truncate","char","declare","SiteName","net user","xp_cmdshell","/add",
                              "exec master.dbo.xp_cmdshell","net localgroup administrators"};
        //构造正则表达式
        String str_Regex = ".*(";
        for (int i = 0; i < strBadChar.Length - 1; i++)
        {
            str_Regex += strBadChar[i] + "|";
        }
        str_Regex += strBadChar[strBadChar.Length - 1] + ").*";

        return str_Regex;
    }
}

 void Application_BeginRequest(Object sender, EventArgs e)
    {
        bool result = false;
        result = SQLInjectionHelper.ValidUrlData(Request.RequestType.ToUpper());
        if (result)
        {
            Response.Write("您提交的数据有恶意字符!");
            Response.End();
        }
    }