用C#遍历XML

答案：using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Xml;

namespace WindowsApplication3
{
    /// <summary>
    /// Form1 的摘要说明。
    /// </summary>
    public class Form1 : System.Windows.Forms.Form
    {
        private System.Windows.Forms.Button button1;
        private XmlDocument doc = new XmlDocument();
        private   XmlNode attrColl;
        private System.Windows.Forms.Button button2;
        private System.Windows.Forms.HelpProvider helpProvider1;
        /// <summary>
        /// 必需的设计器变量。
        /// </summary>
        private System.ComponentModel.Container components = null;

        public Form1()
        {
            //
            // Windows 窗体设计器支持所必需的
            //
            InitializeComponent();

            //
            // TODO: 在 InitializeComponent 调用后添加任何构造函数代码
            //
        }

        /// <summary>
        /// 清理所有正在使用的资源。
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if (components != null) 
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }

        #region Windows Form Designer generated code
        /// <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.button1 = new System.Windows.Forms.Button();
            this.button2 = new System.Windows.Forms.Button();
            this.helpProvider1 = new System.Windows.Forms.HelpProvider();
            this.SuspendLayout();
            // 
            // button1
            // 
            this.button1.Location = new System.Drawing.Point(184, 32);
            this.button1.Name = "button1";
            this.button1.TabIndex = 0;
            this.button1.Text = "button1";
            this.button1.Click += new System.EventHandler(this.button1_Click);
            // 
            // button2
            // 
            this.helpProvider1.SetHelpNavigator(this.button2, System.Windows.Forms.HelpNavigator.Topic);
            this.helpProvider1.SetHelpString(this.button2, "pppppp");
            this.button2.Location = new System.Drawing.Point(176, 88);
            this.button2.Name = "button2";
            this.helpProvider1.SetShowHelp(this.button2, true);
            this.button2.TabIndex = 1;
            this.button2.Text = "button2";
            this.button2.MouseHover += new System.EventHandler(this.button2_MouseHover);
            this.button2.HelpRequested += new System.Windows.Forms.HelpEventHandler(this.button2_HelpRequested);
            // 
            // Form1
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
            this.ClientSize = new System.Drawing.Size(448, 285);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                          this.button2,
                           &n

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