怎样修改App.config文件的数据库配置节?

Question

我想在WINFORM中通过程序来修改在app.config中原来的配置            ConnStrConfig csc = new ConnStrConfig();
            csc.Db = config_db.Text.Trim();
            csc.PassWord = config_passWord.Text.Trim();
            csc.Server = config_tbServerName.Text.Trim();
            csc.Trust = config_trustConn.Checked;
            csc.UserName = config_tbUserName.Text.Trim();
                Properties.Settings.Default.ConStr = csc.ToString();
                Properties.Settings.Default.Save();
                MessageBox.Show("连接测试通过，已保存连接信息到配置文件", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
在Properties.Settings.Default.ConStr = csc.ToString();中出现  错误 1 无法对属性或索引器“ChangeDBLink.Properties.Settings.ConStr”赋值 -- 它是只读的 从而更改不了,请帮忙?

Answer 1

http://hi.baidu.com/%CC%EC%B5%D8%BB%CC%BB%CC/blog/item/b467de314cb532ab5fdf0e7e.html

Answer 2

http://www.cnblogs.com/chinhr/archive/2009/02/26/1398913.html
http://www.cnblogs.com/yunhuasheng/archive/2009/03/19/1113091.html

Answer 3

ConfigurationManager.ConnectionStrings["节点名"].ToString();

Answer 4

正确，当然你也可以以xml文件进行修改，但要重新启动应用程序

Answer 5

下面一个根lz要求一样的例子：using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Configuration;namespace SMSTimer
{
    public partial class Form3 : Form
    {
        public Form3()
        {
            InitializeComponent();
        }        private void button2_Click(object sender, EventArgs e)
        {
            this.Close();
        }        private void button1_Click(object sender, EventArgs e)
        {
            //修改config配置文件
            Configuration config;
            string configPath = System.Windows.Forms.Application.ExecutablePath;
            config = ConfigurationManager.OpenExeConfiguration(configPath);
            ConnectionStringsSection connectionString = (ConnectionStringsSection)config.GetSection("connectionStrings");
            connectionString.ConnectionStrings["DBConn"].ConnectionString = "Data Source="+textBox1.Text.Trim()+";Initial Catalog="+textBox2.Text.Trim()+";Persist Security Info=True;User ID="+textBox3.Text.Trim()+";Password="+textBox4.Text.Trim();
            config.Save();            MessageBox.Show("修改成功！","提示");
            this.DialogResult = DialogResult.OK;
        }        private void Form3_Load(object sender, EventArgs e)
        {
            Configuration config;
            string configPath = System.Windows.Forms.Application.ExecutablePath;
            config = ConfigurationManager.OpenExeConfiguration(configPath);
            ConnectionStringsSection connectionString = (ConnectionStringsSection)config.GetSection("connectionStrings");            string connstr = connectionString.ConnectionStrings["DBConn"].ConnectionString;
            string usr = "", pwd = "", svr = "", dbn = "";
            string[] tempstrs = connstr.Split(';');            foreach (string tempstr in tempstrs)
            {
                string[] strs = tempstr.Split('=');
                switch (strs[0])
                {
                    case "User ID": usr = strs[1]; break;
                    case "Password": pwd = strs[1]; break;
                    case "Data Source": svr = strs[1]; break;
                    case "Initial Catalog": dbn = strs[1]; break;
                }
            }
            textBox1.Text = svr;
            textBox2.Text = dbn;
            textBox3.Text = usr;
            textBox4.Text = pwd;
        }    }
}