c#-4.0 – 如何在安装项目中写入app.config并在程序中使用它

插入到app.config的这些值在安装后创建的[projectName] .exe.config文件中不可用.
我已经手动在app.config中添加了如下所示的部分(B)

数据传递给安装程序类,但数据不会写入app.config字段.它们在安装期间在创建的配置文件中保持相同.

任何帮助是极大的赞赏.我花了将近一天的时间.

代码A：

[RunInstaller(true)]
public partial class Installation : System.Configuration.Install.Installer
{
    public Installation()
    {
        InitializeComponent();
    }

    public override void Install(IDictionary stateSaver)
    {
        //base.Install(stateSaver);

        try
        {
            // In order to get the value from the textBox named 'EDITA1' I needed to add the line:
            // '/PathValue = [EDITA1]' to the CustomActionData property of the CustomAction We added. 

            string userName = Context.Parameters["userName"];
            string password = Context.Parameters["password"];
            string folderPath = Context.Parameters["path"];

            MessageBox.Show(userName);
            MessageBox.Show(password);
            MessageBox.Show(folderPath);

            Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
           //config.AppSettings.Settings.Add("userName",userName);
           //config.AppSettings.Settings.Add("password",password);
           //config.AppSettings.Settings.Add("foderPath",folderPath);





            config.AppSettings.Settings["userName"].Value = userName;
            config.AppSettings.Settings["password"].Value = password;
            config.AppSettings.Settings["foderPath"].Value = folderPath;
            config.Save(ConfigurationSaveMode.Full);
            ConfigurationManager.RefreshSection("appSettings");




        }
        catch (FormatException e)
        {
            string s = e.Message;
            throw e;
        }
    }
}

应用配置中添加的部分是
代码B：

<appSettings>
<add key="userName" value="" />
<add key="password" value="" />
<add key="foderPath" value="" />
</appSettings>