C# - 使用ConfigurationManager保存数据到App.config

1. ConfigurationManager的命名空间：using System.Configuration;

2. To be able to save you have to use a configuration object
returned by the OpenExeConfiguration Method

//Create the object

Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

//make changes

config.AppSettings.Settings["Username"].Value = txtUsername.Text;

config.AppSettings.Settings["Password"].Value = txtPassword.Text;
//save to apply changes

config.Save(ConfigurationSaveMode.Modified);

ConfigurationManager.RefreshSection("appSettings");

3. When you run your application with F5,

• your code is compiled,


• the executable is copied to
  the bin or bin\Debug subdirectory
  of your source code directory,


• your app.config is copied
  as yourexecutable.exe.config into that directory,
  and


• your executable is started in that directory.

Thus, your application uses
the yourexecutable.exe.config in
the bin or bin\Debug directory,
and it
is there that ConfigurationManager saves
the changes, not in your source code directory. This won‘t be an issue after
deploying your application, because then, changes will go
to yourexecutable.exe.config in the deployment directory,
which is what you want.