Form1.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Xml;
using System.Xml.Linq;
using System.Collections;
using System.IO;
using System.Configuration;
// 下载于www.51aspx.com
namespace NoRepeatition
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

        private void btnOpen_Click(object sender, EventArgs e)
        {
            try
            {
                //"C:\\Documents and Settings\\Administrator\\桌面" //注意这里写路径时要用c:\\而不是c:\
                ofdXML.InitialDirectory = Environment.CurrentDirectory;
                ofdXML.Filter = "XML文件|*.XML";
                ofdXML.RestoreDirectory = true;
                ofdXML.FilterIndex = 1;
                this.ofdXML.ShowDialog();

                this.txtOpenPath.Text = this.ofdXML.FileName;
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (this.txtOpenPath.Text.Trim().Equals(""))
            {
                this.lblOpen.Visible = true;
                this.lblOpen.Text = "路径不能为空！";
                return;
            }
            else
                this.lblOpen.Visible = false;
            if (this.txtSavePath.Text.Trim().Equals(""))
            {
                this.lblSave.Visible = true;
                this.lblSave.Text = "路径不能为空！";
                return;
            }
            else