关于winform中*.exe.config中的appSettings的节点的读取与修改

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//读取到这个节点
string file = System.Windows.Forms.Application.ExecutablePath;
Configuration config = ConfigurationManager.OpenExeConfiguration(file); string comNumber = config.AppSettings.Settings["comNumber"].Value.ToString();
comboBox1.SelectedItem = comNumber; //设置这个节点方法1，亲测可行
string file = System.Windows.Forms.Application.ExecutablePath;
Configuration config = ConfigurationManager.OpenExeConfiguration(file); bool exist = false;//记录这个com端口值是否存在
if (config.AppSettings.Settings["comNumber"] != null)
{
exist = true;
}
if (exist)
{
config.AppSettings.Settings.Remove("comNumber");
}
config.AppSettings.Settings.Add("comNumber", comNO);
config.Save(ConfigurationSaveMode.Modified);
ConfigurationManager.RefreshSection("appSettings");

//方法2，因为上方法可行，这个并没有测试
//Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
//config.AppSettings.Settings.
//config.AppSettings.Settings.Add("comNumber", comNO);
//config.Save(ConfigurationSaveMode.Full);
//ConfigurationManager.RefreshSection("appSettings");