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///<summary>
///config文件中appSettings配置节增加一对键、值对
///</summary>
///<param name="newKey"></param>
///<param name="newValue"></param>
public bool UpdateAppConfig(string key, string value)
{
Configuration conf = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
if (!conf.AppSettings.Settings.AllKeys.Contains(key))
conf.AppSettings.Settings.Add(key, value);
else
conf.AppSettings.Settings[key].Value = value;
conf.Save(ConfigurationSaveMode.Modified);
ConfigurationManager.RefreshSection(conf.AppSettings.SectionInformation.Name);
return true;
}