如何修改 app.config 的配置信息

如何修改 app.config 的配置信息 收藏

最问这个问题的人有点多，其实 .Net 提供了这样的功能我们可以在 app.config 中 userSettings 节点中保存我们的应用程序设置信息。

https://www.cnblogs.com/liningx/archive/2010/08/25/1808328.html

具体操作步骤：

1 添加您需要保存的变量名称。在你的项目上点击右键选“属性” -> "设置"。在设置界面中输入你需要的变量名称。如添加变量 UserName 和ConnectionString，见下图。

添加完成后保存一下，我们会发现上面的内容实际是保存在 app.config 的 userSetting 节点下的。

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <configSections>
        <sectionGroup name="userSettings" type="System.Configuration.UserSettingsGroup, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" >
            <section name="X.UserSettingDemo.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" allowExeDefinition="MachineToLocalUser" requirePermission="false" />
        </sectionGroup>
    </configSections>
    <!--保存在这里-->
    <userSettings>
        <X.UserSettingDemo.Properties.Settings>
            <setting name="ConnetionString" serializeAs="String">
                <value />
            </setting>
            <setting name="UserName" serializeAs="String">
                <value />
            </setting>
        </X.UserSettingDemo.Properties.Settings>
    </userSettings>
</configuration>

<?xml version="1.0" encoding="utf-8" ?> <configuration> <configSections> <sectionGroup name="userSettings" type="System.Configuration.UserSettingsGroup, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" > <section name="X.UserSettingDemo.Properties.Settings" type="System.Configuration.ClientSettingsSection, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" allowExeDefinition="MachineToLocalUser" requirePermission="false" /> </sectionGroup> </configSections> <!--保存在这里--> <userSettings> <X.UserSettingDemo.Properties.Settings> <setting name="ConnetionString" serializeAs="String"> <value /> </setting> <setting name="UserName" serializeAs="String"> <value /> </setting> </X.UserSettingDemo.Properties.Settings> </userSettings> </configuration> 

2 读取与保存上面在 app.config 中添加的 UserName, ConnectionString 变量。

using System;
using System.Windows.Forms;
namespace X.UserSettingDemo
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            this.InitApperance();
        }
        private void btnSave_Click(object sender, EventArgs e)
        {
            this.SaveUserSetting();
        }
        /// <summary>
        /// 从配置文件中读取信息来初始控件的值。
        /// </summary>
        private void InitApperance()
        {
            this.txtUserName.Text = X.UserSettingDemo.Properties.Settings.Default.UserName;
            this.txtConnectionString.Text = X.UserSettingDemo.Properties.Settings.Default.ConnetionString;
        }
        /// <summary>
        /// 将控件的值保存到 app.config 文件中以使用下次打开程序时能直接显示或使用。
        /// </summary>
        private void SaveUserSetting()
        {
            X.UserSettingDemo.Properties.Settings.Default.UserName = this.txtUserName.Text;
            X.UserSettingDemo.Properties.Settings.Default.ConnetionString = this.txtConnectionString.Text;
            X.UserSettingDemo.Properties.Settings.Default.Save();
        }
    }
}