webform1.aspx.cs

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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 CheckIPDomain
{
	/// <summary>
	/// WebForm1 的摘要说明。
	/// </summary>
	public class WebForm1 : System.Web.UI.Page
	{
		protected System.Web.UI.WebControls.TextBox txtDomain;
		protected System.Web.UI.WebControls.TextBox txtIP;
		protected System.Web.UI.WebControls.Label Label1;
		protected System.Web.UI.WebControls.Label Label2;
		protected System.Web.UI.WebControls.Button btnCheckDomain;
		protected System.Web.UI.WebControls.Button btnCheckIP;
		protected System.Web.UI.WebControls.Label lbResult;
	
		string resultMsg = "";
		private void Page_Load(object sender, System.EventArgs e)
		{
			// 在此处放置用户代码以初始化页面
		}

		#region Web Form Designer generated code
		override protected void OnInit(EventArgs e)
		{
			//
			// CODEGEN：该调用是 ASP.NET Web 窗体设计器所必需的。
			//
			InitializeComponent();
			base.OnInit(e);
		}
		
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{    
			this.btnCheckDomain.Click += new System.EventHandler(this.btnCheckDomain_Click);
			this.btnCheckIP.Click += new System.EventHandler(this.btnCheckIP_Click);
			this.Load += new System.EventHandler(this.Page_Load);

		}
		#endregion

		private void btnCheckDomain_Click(object sender, System.EventArgs e)
		{
			if (txtDomain.Text != "")
			{
				try 
				{
					//根据域名，获得主机地址，AddressList中包含IP地址
					IPHostEntry hostInfo = Dns.GetHostByName(txtDomain.Text );
					resultMsg = hostInfo.AddressList[0].ToString ();
				}
				catch(Exception ex)
				{
					resultMsg = ex.Message ;
				}
			}
			lbResult.Text = "查询结果 <br>";
			lbResult.Text += resultMsg;
			
		}

		private void btnCheckIP_Click(object sender, System.EventArgs e)
		{
			if (txtIP.Text != "")
			{
				try
				{
					//根据IP地址，获得主机信息，HostName为域名
					IPHostEntry hostInfo = Dns.GetHostByAddress(txtIP.Text );
					resultMsg = hostInfo.HostName ;
				}
				catch(Exception ex)
				{
					resultMsg = ex.Message ;
				}
			}
			lbResult.Text = "查询结果 <br>";
			lbResult.Text += resultMsg;
		}
	}
}