从应用程序安装文件夹的子文件夹中读取文件

Question

我必须从.txt文件中读取文本内容，该文件位于应用程序安装文件夹中的子文件夹中，根据Microsoft 文档，我这样做：

 private async void readMyFile()
    {
        // Get the app's installation folder.
        StorageFolder appFolder = Windows.ApplicationModel.Package.Current.InstalledLocation;

        // Get a file from a subfolder of the current folder by providing a relative path.
        string txtFileName = @"\myfolder\myfile.txt";

        try
        {
            //here my file exists and I get file path
            StorageFile txtfile = await appFolder.GetFileAsync(txtFileName);
            Debug.WriteLine("ok file found: " + txtfile.Path);

            //here I get the error
            string text = await FileIO.ReadTextAsync(txtfile);
            Debug.WriteLine("Txt is: " + text);
        }
        catch (FileNotFoundException ex)
        {
        }

    }

错误是：

    Exception thrown: 'System.IO.FileNotFoundException' in mscorlib.ni.dll
exception file not found: System.IO.FileNotFoundException: The filename, directory name, or volume label syntax is incorrect. (Exception from HRESULT: 0x8007007B)
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at Smadshop.MainPage.<testExistsFile>d__8.MoveNext()

必须注意，如果我使用没有子文件夹的文件，一切正常。

Answer 1

你可以用其他方式做到这一点，使用URI：

using Windows.Storage;
StorageFile file = await StorageFile.GetFileFromApplicationUriAsync("ms-appx:///file.txt");

所以在你的情况下，它将是：

StorageFile txtfile = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///myfolder/myfile.txt"));