C＃应用程序设置未保存

Question

Using VS2010 Express , Win7-64. In my application I Have several Application settings. Most (mixed types) are User Settings, one is Application Setting (a DataSet).

I use the built-in Settings table where the one setting scope is set as Application, while the others scope is User. The User settings are all saved and retrieved OK, and can also be seen in the XML file.

(string userConfig = ConfigurationManager.OpenExeConfiguration(
                  ConfigurationUserLevel.PerUserRoamingAndLocal).FilePath;)

Problem: While the User settings are saved OK, the one Application Setting is not saved and is not present in the relevant config file.

(string appConfig = ConfigurationManager.OpenExeConfiguration(
                  ConfigurationUserLevel.None).FilePath;).

In the Settings.Design file we can see the Application Setting as read-only item (get only), which is OK, but no data is saved, and no data is found, (except a null DataSet).

There is similar DataSet in the User settings that is saved OK, and can be loaded.

To save the settings, I run:

Properties.Settings.Default.Upgrade();
Properties.Settings.Default.Save();

Thanks

Answer 1

Application-scope settings are read only, and can only be changed at design time. so when you call save method it does not persist the data.

User-scope settings, however, can be written at run time, just as you would change any property value.

for more information you can see Using Settings in C# .