ASP.NET 例程完全代码版(4)——DNS静态类

2022-04-11 09:48:00

GetHostAndIP.aspx:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="GetHostAndIP.aspx.cs" Inherits="GetHostAndIP" %>
<html xmlns="[url]http://www.w3.org/1999/xhtml[/url]" >
<body>
    <form id="form1" runat="server">
    <div>
        <table style="width: 925px; height: 180px">
            <tr>
                <td style="width: 44px">
                    <asp:TextBox ID="txtDomain" runat="server"></asp:TextBox></td>
                <td style="width: 3px">
                    <asp:Button ID="btnOK" runat="server" Text="转换为IP地址：" OnClick="btnOK_Click" /></td>
                <td style="width: 116px">
                     <asp:Label ID="lblMsg" runat="server"></asp:Label></td>
            </tr>
            <tr>
                <td style="width: 44px; height: 76px;">
                    <asp:TextBox ID="txtIP" runat="server"></asp:TextBox> 
                </td>
                <td style="width: 3px; height: 76px;">
                    <asp:Button ID="Button1" runat="server"   Text="对应域名为：" OnClick="Button1_Click"/></td>
                <td style="width: 116px; height: 76px;">
                    <asp:Label ID="lblDomain" runat="server" Text=""></asp:Label></td>
            </tr>
            <tr>
                <td style="width: 44px; height: 30px;">
                </td>
                <td style="width: 3px; height: 30px;">
                </td>
                <td style="width: 116px; height: 30px;">
                </td>
            </tr>
        </table>
    </div>
    </form>
</body>
</html>

code behind代码：GetHostAndIP.aspx.cs:
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;
using System.Collections.Specialized;
using System.Net;
public partial class GetHostAndIP : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        //得到当前浏览器头信息
        NameValueCollection headers = new NameValueCollection();
        headers = Request.Headers;

        string strCookies = null;
        for (int i = 0; i < headers.Count; i++)
        {
            strCookies = headers.GetKey(i);
            Response.Write("<br>Name:" + strCookies + "    Value:" + headers.Get(strCookies));
        }

        //得到主机名和IP
        string hostName = Dns.GetHostName();
        IPAddress[] ip = Dns.GetHostAddresses(hostName);
        Response.Write("ServerName :&nbsp" + hostName + "   IP:&nbsp&nbsp" + ip[0].ToString());
    }
    protected void btnOK_Click(object sender, EventArgs e)
    {
        IPAddress[] ip = Dns.GetHostAddresses(txtDomain.Text);
        lblMsg.Text = ip[0].ToString();
        //or
        //IPHostEntry hostInfo = Dns.GetHostByName(txtDomain.Text);//gets the DND info for the specified DNS host name
        //lblMsg.Text = hostInfo.AddressList[0].ToString();
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        IPHostEntry hostInfo = Dns.GetHostEntry(txtIP.Text);
        lblDomain.Text = hostInfo.HostName;
    }
}

说明：
IPHostEntry:为 Internet 主机地址信息提供容器类。
程序中用到的属性：
AddressList 获取或设置与主机关联的 IP 地址列表。
HostName 获取或设置主机的 DNS 名称。
Dns静态类：提供简单的域名解析功能，它从 Internet 域名系统 (DNS) 检索关于特定主机的信息。在 IPHostEntry 类的实例中返回来自 DNS 查询的主机信息。如果指定的主机在 DNS 数据库中有多个入口，则 IPHostEntry 包含多个 IP 地址和别名。

本文转自 august 51CTO博客，原文链接：http://blog.51cto.com/august/6970，如需转载请自行联系原作者

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