FileSaver throws an exception when user click cancel on DialogWindow.

[danielancines]

Using the new FileSaver when user click Cancel, FileSaver throws an exception CommunityToolkit.Maui.Storage.FileSaveException: 'Path doesn't exist.' this is an error or an expected behavior?

On this repository, from Gerald Versluis, this situation was verified: https://github.com/jfversluis/MauiToolkitFileSaverSample.

[VladislavAntonyuk]

The exception is expected. Probably error message should be different. We have just changed the implementation to avoid exception. It will be released later this week.

[danielancines]

Great, thank you!!

[ewerspej]

@VladislavAntonyuk I think this behavior should be changed to support different status codes, e.g.

public enum FileSaverStatus
{
    Success, // file saved successfully
    Error, // an error or exception occured
    UserCancelled, // user manually cancelled the operation
}

Then, the FileSaverResult could have this additional flag:

public record FileSaverResult(string? FilePath, Exception? exception, FileSaverStatus? Status)
{
    // ...
}

That way, we can interrogate the result, for example to display different messages to the user:

var result = await _fileSaver.SaveAsync(filename, fileStream, CancellationToken.None);

if(!result.IsSuccessful)
{
    switch(result.Status)
    {
        case Error:
            await _dialogs.AlertAsync($"Failed to save file: { result.Exception }");
            break;
        case UserCancelled:
            await _dialogs.AlertAsync("User cancelled");
            break;
    }

    return;
}

await _dialogs.AlertAsync($"File saved successfully: { filename }");

or even simpler:

var result = await _fileSaver.SaveAsync(filename, fileStream, CancellationToken.None);

switch(result.Status)
{
    case Success:
        await _dialogs.AlertAsync($"File saved successfully: { filename }");
        break;
    case Error:
        await _dialogs.AlertAsync($"Failed to save file: { result.Exception }");
        break;
    case UserCancelled:
        await _dialogs.AlertAsync("User cancelled");
        break;
}

[ewerspej]

Would it be possible to pick this topic up again?