C# IP地址和DNS 网络(三)

             Uri i = new Uri("http://www.baidu.com");   //可获取属性

             UriBuilder u = new UriBuilder("http://www.baidu.com");  //可获取、设置属性

             IPAddress ipAddress = IPAddress.Parse("192.168.31.34");  //ip地址转换
             byte[] address = ipAddress.GetAddressBytes();
             string ipString = ipAddress.ToString();

             IPHostEntry host = Dns.Resolve("www.baidu.com"); //获取IPHostEntry对象
             IPHostEntry whost = Dns.GetHostByAddress("192.168.31.114");

根据域名、地址，查询主机信息

Form

 public partial class Form1 : Form
     {
         public Form1()
         {
             InitializeComponent();
         }

         private void button1_Click(object sender, EventArgs e)
         {
             try
             {
                 IPHostEntry iphost = Dns.GetHostEntry(textBox1.Text);
                 foreach(var ip in iphost.AddressList)
                 {
                     string ipaddress = ip.AddressFamily.ToString();
                     listBox1.Items.Add(ipaddress);
                     listBox1.Items.Add("  " + ip.ToString());
                 }
                 textBox2.Text = iphost.HostName;

             }
             catch (Exception ex)
             {
                 MessageBox.Show("Unable to process  the request because the following problem occurred:\n" + ex.Message + " Exception occurred");   

             }
         }
     }

Designer

    partial class Form1
     {
         /// <summary>
         /// Required designer variable.
         /// </summary>
         private System.ComponentModel.IContainer components = null;

         /// <summary>
         /// Clean up any resources being used.
         /// </summary>
         /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
         protected override void Dispose(bool disposing)
         {
             if (disposing && (components != null))
             {
                 components.Dispose();
             }
             base.Dispose(disposing);
         }

         #region Windows Form Designer generated code

         /// <summary>
         /// Required method for Designer support - do not modify
         /// the contents of this method with the code editor.
         /// </summary>
         private void InitializeComponent()
         {
             this.label1 = new System.Windows.Forms.Label();
             this.button1 = new System.Windows.Forms.Button();
             this.textBox1 = new System.Windows.Forms.TextBox();
             this.textBox2 = new System.Windows.Forms.TextBox();
             this.label2 = new System.Windows.Forms.Label();
             this.label3 = new System.Windows.Forms.Label();
             this.listBox1 = new System.Windows.Forms.ListBox();
             this.SuspendLayout();
             //
             // label1
             //
             this.label1.AutoSize = true;
             this.label1.Location = new System.Drawing.Point(, );
             this.label1.Name = "label1";
             this.label1.Size = new System.Drawing.Size(, );
             this.label1.TabIndex = ;
             this.label1.Text = "Enter name to resolve and click Resolve button";
             //
             // button1
             //
             this.button1.Location = new System.Drawing.Point(, );
             this.button1.Name = "button1";
             this.button1.Size = new System.Drawing.Size(, );
             this.button1.TabIndex = ;
             this.button1.Text = "Resolve";
             this.button1.UseVisualStyleBackColor = true;
             this.button1.Click += new System.EventHandler(this.button1_Click);
             //
             // textBox1
             //
             this.textBox1.Location = new System.Drawing.Point(, );
             this.textBox1.Name = "textBox1";
             this.textBox1.Size = new System.Drawing.Size(, );
             this.textBox1.TabIndex = ;
             //
             // textBox2
             //
             this.textBox2.Location = new System.Drawing.Point(, );
             this.textBox2.Name = "textBox2";
             this.textBox2.Size = new System.Drawing.Size(, );
             this.textBox2.TabIndex = ;
             //
             // label2
             //
             this.label2.AutoSize = true;
             this.label2.Location = new System.Drawing.Point(, );
             this.label2.Name = "label2";
             this.label2.Size = new System.Drawing.Size(, );
             this.label2.TabIndex = ;
             this.label2.Text = "HostName";
             //
             // label3
             //
             this.label3.AutoSize = true;
             this.label3.Location = new System.Drawing.Point(, );
             this.label3.Name = "label3";
             this.label3.Size = new System.Drawing.Size(, );
             this.label3.TabIndex = ;
             this.label3.Text = "IP Addresses";
             //
             // listBox1
             //
             this.listBox1.FormattingEnabled = true;
             this.listBox1.ItemHeight = ;
             this.listBox1.Location = new System.Drawing.Point(, );
             this.listBox1.Name = "listBox1";
             this.listBox1.Size = new System.Drawing.Size(, );
             this.listBox1.TabIndex = ;
             //
             // Form1
             //
             this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
             this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
             this.ClientSize = new System.Drawing.Size(, );
             this.Controls.Add(this.listBox1);
             this.Controls.Add(this.label3);
             this.Controls.Add(this.label2);
             this.Controls.Add(this.textBox2);
             this.Controls.Add(this.textBox1);
             this.Controls.Add(this.button1);
             this.Controls.Add(this.label1);
             this.Name = "Form1";
             this.Text = "Form1";
             this.ResumeLayout(false);
             this.PerformLayout();

         }

         #endregion

         private System.Windows.Forms.Label label1;
         private System.Windows.Forms.Button button1;
         private System.Windows.Forms.TextBox textBox1;
         private System.Windows.Forms.TextBox textBox2;
         private System.Windows.Forms.Label label2;
         private System.Windows.Forms.Label label3;
         private System.Windows.Forms.ListBox listBox1;
     }