.NET Config文件的简单存取

读配置：

 txtPath.Text = ConfigurationManager.AppSettings["ImportFilePath"];

存配置：

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

if (config.AppSettings.Settings["ImportFilePath"] == null)
　　config.AppSettings.Settings.Add("ImportFilePath", txtPath.Text);
else
　　config.AppSettings.Settings["ImportFilePath"].Value = txtPath.Text;

config.Save(ConfigurationSaveMode.Full);
ConfigurationManager.RefreshSection("appSettings");