如何在构建时将文件从Visual Studio项目复制到UWP应用程序的LocalFolder

Question

I have a Xamarin solution with a UWP project in it. I cannot understand how to copy a file that is in my VS project to the UWP LocalFolder. I've tried fiddling with the file's Build Action (Compile, Content, Embedded Resource, AdditionalFiles) and I've tried to manually create this location.

Apparently this code:

Windows.Storage.StorageFolder appDataFolder = Windows.Storage.ApplicationData.Current.LocalFolder;

string fileName = (appDataFolder.Path + "\\HighScore.csv");

Creates this path:

'C:\\Users\\<my Name>\\AppData\\Local\\Packages\\ebf29fcf-0080-4b4c-b873-78fd1340811d_9tywq191txc1p\\LocalState\\HighScore.csv'

So I just need to figure out how to get the CSV file that's in my project to this LocalState folder. Any help appreciated.

Answer 1

You could put in some code to copy it there:

// This would point to (in respect to your build platform target):
// C:\Users\User\Source\Repos\MyAwesomeApp\MyAwesomeApp.UWP\bin\x64\Debug\AppX
Uri uri = new Uri("ms-appx:///HighScores.csv");


// throws Exception if file doesn't exist
var file = await StorageFile.GetFileFromApplicationUriAsync(uri);


// copy the file to the package:
await file.CopyAsync(ApplicationData.Current.LocalFolder);

That's the jist of it. Hope it works for you.

Answer 2

Firstly, add the .csv file to your assets folder and set the build action to Content .

After that, you can manually copy the file from Assets to your Local Folder at runtime with the following snippet.

var file = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///Assets/HighScore.csv"));
 if (file != null)
 {
     // Copy .csv file to LocalFolder so we can read / write to it.
     // No CollisionOption will default to Fail if file already exists,
     // to copy every time the code is run, add NameCollisionOption.ReplaceExisting
     await file.CopyAsync(ApplicationData.Current.LocalFolder);

     // Get path of newly created file
     String newFile = ApplicationData.Current.LocalFolder.Path + "/HighScore.csv";
 }