c#读写配置文件

读配置很简单，能够用ConfigurationManager.AppSettings[key] 来读出，

但是写配置文件时，若是写成这样

ConfigurationManager.AppSettings[key] = "111";

老是提示只读，那么该怎么办呢？

using System;
using System.Collections.Generic;
using System.Text;
using System.Configuration;

namespace BQKJ.Common
{
    /// <summary>
    /// 对exe.Config文件中的appSettings段进行读写配置操做
    /// 注意：调试时，写操做将写在vhost.exe.config文件中
    /// </summary>
    public class ConfigAppSettings
    {
        /// <summary>
        /// 写入值
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public static void SetValue(string key, string value)
        {
            //增长的内容写在appSettings段下 <add key="RegCode" value="0"/>
            System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            if (config.AppSettings.Settings[key] == null)
            {
                config.AppSettings.Settings.Add(key, value);
            }
            else
            {
                config.AppSettings.Settings[key].Value = value;
            }
            config.Save(ConfigurationSaveMode.Modified);
            ConfigurationManager.RefreshSection("appSettings");//从新加载新的配置文件
        }

        /// <summary>
        /// 读取指定key的值
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public static string GetValue(string key)
        {
            System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            if (config.AppSettings.Settings[key] == null)
                return "";
            else
                return config.AppSettings.Settings[key].Value;
        }

    }
}

其实也很简单，用这两个封装过的方法就能够了。

 

须要注意的是，在IDE调试时，写入的配置文件实际上是写在了.vshost.exe.config文件中，因此你在.exe.config中是看不到的。只有直接运行exe文件时，才会正确写入到.exe.config中。

 private void button1_Click(object sender, EventArgs e)

 {

            string serverIP = ConfigHelper.GetValue("ServerIP");

            string db = ConfigHelper.GetValue("DataBase");

            string user = ConfigHelper.GetValue("user");

            string password = ConfigHelper.GetValue("password");

 

            string info = "serverIP:" + serverIP + "\r\n"

            + "db:" + db + "\r\n"

            + "user:" + user + "\r\n"

            + "password:" + password + "\r\n";

            MessageBox.Show(info);

 

            ConfigHelper.SetValue("DataBase", "ttdb");

            string newIP = ConfigHelper.GetValue("DataBase");

 

            MessageBox.Show(newIP);

    }

using System;
using System.Collections.Generic;
using System.Text;
using System.Configuration;

namespace BQKJ.Common
{
    /// <summary>
    /// 对exe.Config文件中的appSettings段进行读写配置操做
    /// 注意：调试时，写操做将写在vhost.exe.config文件中
    /// </summary>
    public class ConfigAppSettings
    {
        /// <summary>
        /// 写入值
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public static void SetValue(string key, string value)
        {
            //增长的内容写在appSettings段下 <add key="RegCode" value="0"/>
            System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            if (config.AppSettings.Settings[key] == null)
            {
                config.AppSettings.Settings.Add(key, value);
            }
            else
            {
                config.AppSettings.Settings[key].Value = value;
            }
            config.Save(ConfigurationSaveMode.Modified);
            ConfigurationManager.RefreshSection("appSettings");//从新加载新的配置文件
        }

        /// <summary>
        /// 读取指定key的值
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public static string GetValue(string key)
        {
            System.Configuration.Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            if (config.AppSettings.Settings[key] == null)
                return "";
            else
                return config.AppSettings.Settings[key].Value;
        }

    }
}