利用DNS类．域名转化ip地址,利用ip地址转换域名

最新推荐文章于 2025-06-04 09:32:12 发布

zhijie_hao

最新推荐文章于 2025-06-04 09:32:12 发布

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分类专栏： asp.net 文章标签： asp textbox server webform button object

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本文介绍了一个简单的DNS查询示例，展示了如何使用C#获取主机名、域名及IP地址，并提供了完整的代码实现。

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DNS类．internet域名系统是网络应用程序获取网络上主机信息的常规系统．

主机的信息包括主机名，域名，ip地址．

DNS方法总是以IPJostEntry对象的形式返回信息．

cs代码：　

using System;

using System.Collections;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Web;

using System.Web.SessionState;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.HtmlControls;

using System.Net;

namespace ASPNETWORK

{

/// <summary>

/// WebForm1 的摘要说明。

/// </summary>

public partial class WebForm1 : System.Web.UI.Page

{

protected void Page_Load(object sender, System.EventArgs e)

{

lbHost.Text = Dns.GetHostName();

IPHostEntry Host = Dns.GetHostByName(lbHost.Text);

lbHost.Text = "本机域名为:"+lbHost.Text+"IP地址为："+Host.AddressList[0].ToString();

}

Web Form Designer generated code

protected void btnGetIP_Click(object sender, System.EventArgs e)

{

try

{

IPHostEntry Host = Dns.GetHostByName(tbDomain.Text);

lbIP.Text = Host.AddressList[0].ToString();

}

catch(Exception ex)

{

lbIP.Text = ex.Message.ToString();

}

protected void getDomain_Click(object sender, System.EventArgs e)

{

try

{

IPHostEntry Host = Dns.GetHostByAddress(tbIP.Text);

lbDomain.Text = Host.HostName;

}

catch(Exception ex)

{

lbDomain.Text = ex.Message.ToString();

}

html代码：　　

<%@ Page language="c#" Inherits="ASPNETWORK.WebForm1" CodeFile="01DNS.aspx.cs" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >

<HTML>

<HEAD>

<title>WebForm1</title>

</HEAD>

<body>

<asp:Label id="Label1" style="Z-INDEX: 100; LEFT: 242px; POSITION: absolute; TOP: 53px" runat="server" Width="224px" Font-Size="XX-Large">DNS示例</asp:Label>

<asp:Label id="lbDomain" style="Z-INDEX: 113; LEFT: 571px; POSITION: absolute; TOP: 238px" runat="server" Width="136px"></asp:Label>

<asp:Button id="getDomain" style="Z-INDEX: 112; LEFT: 484px; POSITION: absolute; TOP: 236px" runat="server" Text="得到域名" onclick="getDomain_Click"></asp:Button>

<asp:TextBox id="tbIP" style="Z-INDEX: 111; LEFT: 297px; POSITION: absolute; TOP: 237px" runat="server"></asp:TextBox>

<asp:Label id="Label4" style="Z-INDEX: 110; LEFT: 165px; POSITION: absolute; TOP: 243px" runat="server">请输入IP：</asp:Label>

<asp:TextBox id="TextBox1" style="Z-INDEX: 103; LEFT: 296px; POSITION: absolute; TOP: 191px" runat="server"></asp:TextBox>

<asp:Button id="Button1" style="Z-INDEX: 105; LEFT: 484px; POSITION: absolute; TOP: 191px" runat="server" Text="得到IP"></asp:Button>

<asp:Label id="lbHost" style="Z-INDEX: 101; LEFT: 157px; POSITION: absolute; TOP: 136px" runat="server" Width="459px"></asp:Label>

<asp:Label id="Label2" style="Z-INDEX: 102; LEFT: 162px; POSITION: absolute; TOP: 195px" runat="server">请输入域名：</asp:Label>

<asp:TextBox id="tbDomain" style="Z-INDEX: 104; LEFT: 296px; POSITION: absolute; TOP: 191px" runat="server"></asp:TextBox>

<asp:Button id="btnGetIP" style="Z-INDEX: 106; LEFT: 484px; POSITION: absolute; TOP: 191px" runat="server" Text="得到IP" onclick="btnGetIP_Click"></asp:Button>

<asp:Label id="lbIP" style="Z-INDEX: 109; LEFT: 574px; POSITION: absolute; TOP: 195px" runat="server" Width="136px"></asp:Label>

</form>

</body>

</HTML>