[转]winform利用读取xml获取webconfig

本文转自：https://www.cnblogs.com/0banana0/archive/2012/02/02/2335727.html

一、利用读取xml获取web.config中的数据库连接

参考：传送门

 #region 利用读取xml获取webconfig
        private static String GetXML()
        {
            //待修改
            String f = System.Windows.Forms.Application.StartupPath;
            f = f.Replace("调试", "CommonMethod\\Web.config");//对路径进行处理
            XmlDocument doc = new XmlDocument();
            doc.Load(f);
            XmlNodeList add = doc.SelectNodes("//appSettings/add");
            String DBString = "";
            foreach (XmlNode node in add)
            {
                if (node.Attributes["key"].Value.Equals("strConn"))
                {
                    DBString = node.Attributes["value"].Value;
                    break;
                }

            }
            return DBString;
        }

二、获取webconfig的路径

System.IO.Directory.GetCurrentDirectory() 
这个方法,会随着你的当前系统路径的改变而改变.比如你打开一个openFileDialog那么，再次获得路径就不对了。 
string   m_PathStr   =   Application.ExecutablePath; 
是能获得全部，包括exe文件名的一串东西比如c:\abc\abc.exe 
Application.StartupPath 
能够获得当前的运行路径，不包括执行文件名 
比如c:\abc\(又没有那个“\|”不记得了） 
自己分析你要那个吧

参考：传送门
三、利用xml读写web.config

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Xml;
using System.IO;
using System.Drawing.Imaging;
using System.Data.SqlClient;
using System.Windows.Forms.Integration;

namespace WindowsFormsApplication1
{
  public partial class Form1 : Form
  {
    public Form1()
    {
      InitializeComponent();
    }

    String filePath = "";
    private void openFile_Click(object sender, EventArgs e)
    {
      DataTable dataTable1 = new DataTable();
      System.Data.DataRow dr;
      dataTable1.Columns.Add(new System.Data.DataColumn("key", typeof(System.String)));
      dataTable1.Columns.Add(new System.Data.DataColumn("value", typeof(System.String)));
      if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
      {
        filePath = openFileDialog1.FileName;
        if (!filePath.ToLower().EndsWith("web.config"))
        {
          MessageBox.Show("不是web.config");
          return;
        }
        XmlDocument doc = new XmlDocument();
        doc.Load(filePath);
        XmlNodeList add = doc.SelectNodes("//appSettings/add");
        foreach (XmlNode node in add)
        {
          dr = dataTable1.NewRow();
          dr[0] = node.Attributes["key"].Value;
          dr[1] = node.Attributes["value"].Value;
          dataTable1.Rows.Add(dr);
        }
        this.dataGridView1.DataSource = dataTable1;
      }
    }

    private void saveButton_Click(object sender, EventArgs e)
    {
      XmlDocument doc = new XmlDocument();
      doc.Load(filePath);
      XmlNode appSettings = doc.SelectSingleNode("//appSettings");
      appSettings.RemoveAll();
      XmlNodeList add = doc.SelectNodes("//appSettings/add");
      for (int i = 0; i < dataGridView1.Rows.Count; i++)
      {
        if (dataGridView1.Rows[i].Cells[1].Value != null && dataGridView1.Rows[i].Cells[0].Value != null)
        {
          String key = dataGridView1.Rows[i].Cells[0].Value.ToString();
          String value = dataGridView1.Rows[i].Cells[1].Value.ToString();
          if (key.Equals("") || value.Equals("")) return;

          XmlNode newNode = doc.CreateElement("add");
          XmlAttribute attKey = doc.CreateAttribute("key");
          attKey.Value = key;
          newNode.Attributes.Append(attKey);
          XmlAttribute attVaue = doc.CreateAttribute("value");
          attVaue.Value = value;
          newNode.Attributes.Append(attVaue);
          appSettings.AppendChild(newNode);

        }
        doc.Save(filePath);
      }
    }

  }
}