ASP.net做的IP访问限制

　　偶做留言本的时候想起做这么个,具体思路也许不好,做出来只是抛砖引玉,希望有更好的方法!

　　IP添加页是用了一个ListBox, TextBox,两个Button，而在其他的页上则直接用当前IP对比数据库中的IP,代码如下!

　　限制IP添加页HTML代码

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="ip.aspx.cs" Inherits="admin_ip" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>无标题页</title>
    <link href="../images/news.css" rel="stylesheet" type="text/css" />
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:book %>"
            ProviderName="<%$ ConnectionStrings:book.ProviderName %>" SelectCommand="SELECT [ip] FROM [ip]">
        </asp:SqlDataSource>
        <table align="center" style="border-right: #0066cc 1px dotted; border-top: #0066cc 1px dotted; border-left: #0066cc 1px dotted; border-bottom: #0066cc 1px dotted">
            <tr>
                <td rowspan="2" style="width: 100px; border-right: #33ccff 1px groove; border-top: #33ccff 1px groove; border-left: #33ccff 1px groove; border-bottom: #33ccff 1px groove;">
                    <asp:ListBox ID="iplxb" runat="server" DataSourceID="SqlDataSource1" DataTextField="ip"
                        DataValueField="ip" Height="194px" Width="153px"></asp:ListBox></td>
                <td style="width: 100px; border-right: #33ccff 1px groove; border-top: #33ccff 1px groove; border-left: #33ccff 1px groove; border-bottom: #33ccff 1px groove;">
                    填写标准的ＩＰ地址到左下文本框里面，然后点击按纽添加！<br />
                    <asp:RegularExpressionValidator ID="RegularExpressionValidator1" runat="server" ControlToValidate="iptb"
                        Display="Dynamic" ErrorMessage="ＩＰ地址格式不正确" ValidationExpression="([0-9]{2,3})([.])([0-9]{1,3})([.])([0-9]{1,3})([.])([0-9]{1,3})"></asp:RegularExpressionValidator></td>
            </tr>
            <tr>
                <td style="width: 100px; border-right: #33ccff 1px groove; border-top: #33ccff 1px groove; border-left: #33ccff 1px groove; border-bottom: #33ccff 1px groove;">
                    <asp:LinkButton ID="LinkButton1" runat="server" OnClick="LinkButton1_Click">删除选中的行</asp:LinkButton></td>
            </tr>
            <tr>
                <td style="width: 100px; border-right: #33ccff 1px groove; border-top: #33ccff 1px groove; border-left: #33ccff 1px groove; border-bottom: #33ccff 1px groove;">
                    <asp:TextBox ID="iptb" runat="server" Width="150px">61.139.33.22</asp:TextBox></td>
                <td style="width: 100px; border-right: #33ccff 1px groove; border-top: #33ccff 1px groove; border-left: #33ccff 1px groove; border-bottom: #33ccff 1px groove;">
                    <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="增加" Width="80px" /></td>
            </tr>
      </table>   
    </div>
    </form>
</body>
</html>

　　限制IP添加页CS代码

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
public partial class admin_ip : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        Server.Execute("chklog.aspx");
    }
    protected void Button1_Click(object sender, EventArgs e)
    {       
        iplxb.Items.Add(iptb.Text);
        odb.insert("insert into ip (ip) values ('" + iptb.Text + "')");
    }
    protected void LinkButton1_Click(object sender, EventArgs e)
    {
        for (int i = 0; i < iplxb.Items.Count; i++)
        {
            if (iplxb.Items[i].Selected)
            {
                odb.insert("delete from ip where ip='"+iplxb.SelectedItem.Text+"'");
                iplxb.Items.Remove(iplxb.SelectedItem.Text);
            }
        }
    }
}

　　被需要限制IP的页面调用页的代码

protected void Page_Load(object sender, EventArgs e)
    {
        string ip = Request.UserHostAddress.ToString();
            if (Convert.ToInt32(odb.scr("select count(*) from [ip] where ip='" + ip + "'")) > 0)
            Response.Write("对不起，您的IP被限制访问，请咨询管理员");
    }
}