Where should I store my application data?

Question

I have an application that needs to store data. Currently, I am using the built-in Application Settings to do it, but it only gives me two choices: application and user scopes. Ideally, I want a "local" scope that allows the application to run under another user and still find its data rather than recreate it for that user. The application scope can do this, but it's read only. The application data will be changed by the user. It's OK if only the administrator is allowed to make changes to the data.

As you probably can guess, I have an administration tool that allows the user to change the data and windows service runner that reads the data and does something with it. It would be great if the windows service runner access the data created by the administration tool.

Answer 1

If the data is very, very simple, and you need it to be readable by other applications or users (with appropriate permissions), I would probably choose to store it in an XML file or even a plain-text file inside the user's Application Data folder, which would be obtained via Environment.GetFolderPath. An example for saving might look like:

using System.IO;
using System.Xml.Linq;

string settingsDirectory = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);
if (!Directory.Exists(settingsDirectory))
    Directory.CreateDirectory(settingsDirectory);
string fileName = "tasks.xml";
string settingsPath = Path.Combine(settingsDirectory, fileName);
XDocument settingsDoc = new XDocument(
    new XElement("Tasks",
        new XElement("Task",
            new XElement("Name", "Make Breakfast"),
            new XElement("Location", @"C:\Program Files\MyApp\Plugins"),
            new XElement("FileName", "breakfast.dll"))));
// ... etc.
settingsDoc.Save(settingsPath);

That's it - settings saved! You can load them again with XDocument.Load.