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(12, 18);
            this.label1.Name = "label1";
            this.label1.Size = new System.Drawing.Size(281, 12);
            this.label1.TabIndex = 0;
            this.label1.Text = "Enter name to resolve and click Resolve button";
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(259, 30);
            this.button1.Name = "button1";
            this.button1.Size = new System.Drawing.Size(75, 21);
            this.button1.TabIndex = 1;
            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(15, 33);
            this.textBox1.Name = "textBox1";
            this.textBox1.Size = new System.Drawing.Size(228, 21);
            this.textBox1.TabIndex = 2;
            // 
            // textBox2
            // 
            this.textBox2.Location = new System.Drawing.Point(15, 76);
            this.textBox2.Name = "textBox2";
            this.textBox2.Size = new System.Drawing.Size(228, 21);
            this.textBox2.TabIndex = 3;
            // 
            // label2
            // 
            this.label2.AutoSize = true;
            this.label2.Location = new System.Drawing.Point(12, 61);
            this.label2.Name = "label2";
            this.label2.Size = new System.Drawing.Size(53, 12);
            this.label2.TabIndex = 4;
            this.label2.Text = "HostName";
            // 
            // label3
            // 
            this.label3.AutoSize = true;
            this.label3.Location = new System.Drawing.Point(12, 108);
            this.label3.Name = "label3";
            this.label3.Size = new System.Drawing.Size(77, 12);
            this.label3.TabIndex = 5;
            this.label3.Text = "IP Addresses";
            // 
            // listBox1
            // 
            this.listBox1.FormattingEnabled = true;
            this.listBox1.ItemHeight = 12;
            this.listBox1.Location = new System.Drawing.Point(15, 123);
            this.listBox1.Name = "listBox1";
            this.listBox1.Size = new System.Drawing.Size(217, 160);
            this.listBox1.TabIndex = 6;
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(346, 333);
            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;
    }