在UWP的LocalFolder中创建一个文件夹，然后将文件复制到它

Question

我想动态创建文件夹，并需要将文件复制到UWP应用程序的本地文件夹。文件夹名称应为文件名。例如，如果我将文件test01.png上传。然后，文件夹应使用名称" Test01"创建，并且需要将test01.png复制到Test01文件夹。如果文件已经存在，则应显示"文件已经存在，需要替换"的警报。

        FileOpenPicker openPicker = new FileOpenPicker();
        openPicker.ViewMode = PickerViewMode.Thumbnail;
        openPicker.SuggestedStartLocation = PickerLocationId.Desktop;
        foreach (string extension in FileExtensions.Video)
        {
            openPicker.FileTypeFilter.Add(extension);
        }
        file = await openPicker.PickSingleFileAsync();
        if (file != null)
        {
            StorageFolder localFolder = Windows.Storage.ApplicationData.Current.LocalFolder;
            await ApplicationData.Current.LocalFolder.CreateFolderAsync("Data");//need to change the folder name with filename
            string desiredName = file.Name;
            //should copy it to subfolder and raise alert if already exist
            StorageFile newFile = await localFolder.CreateFileAsync(desiredName, CreationCollisionOption.FailIfExists);
        }

Answer 1

这就是您可以做的。我已经用记事本写了这篇文章，没有机会对此进行测试。

FileOpenPicker openPicker = new FileOpenPicker();
openPicker.ViewMode = PickerViewMode.Thumbnail;
openPicker.SuggestedStartLocation = PickerLocationId.Desktop;
foreach (string extension in FileExtensions.Video)
{
    openPicker.FileTypeFilter.Add(extension);
}
file = await openPicker.PickSingleFileAsync();
if (file != null)
{
    StorageFolder localFolder = Windows.Storage.ApplicationData.Current.LocalFolder;
    string folderName = System.IO.Path.GetFileNameWithoutExtension(file.Name);  //folder name with filename
    ////await ApplicationData.Current.LocalFolder.CreateFolderAsync("Data");//need to change the folder name with filename
    StorageFolder testFolder = await Windows.Storage.ApplicationData.Current.LocalFolder.CreateFolderAsync("test", CreationCollisionOption.OpenIfExists);
    ////StorageFolder newFolder = await Windows.Storage.ApplicationData.Current.LocalFolder.CreateFolderAsync(folderName, CreationCollisionOption.OpenIfExists);
    StorageFolder newFolder = await testFolder.CreateFolderAsync(folderName, CreationCollisionOption.OpenIfExists);
    string desiredName = file.Name;
    //should copy it to subfolder and raise alert if already exist
    ////StorageFile newFile = await localFolder.CreateFileAsync(desiredName, CreationCollisionOption.FailIfExists);
    try
    {
        await file.CopyAsync(newFolder, desiredName, NameCollisionOption.FailIfExists);
    }
    catch(Exception exp)
    {
        //show here messagebox that is exists
        Windows.UI.Xaml.Controls.ContentDialog replacePromptDialog = new Windows.UI.Xaml.Controls.ContentDialog()
        {
            Title = "File exists in the new location",
            Content = "Do you want to replace the old file with the new file?",
            CloseButtonText = "Keep the old one",
            PrimaryButtonText = "Replace with new one"
        };
        Windows.UI.Xaml.Controls.ContentDialogResult result = await replacePromptDialog.ShowAsync();
        if (result == Windows.UI.Xaml.Controls.ContentDialogResult.Primary)
        {
            await file.CopyAsync(newFolder, desiredName, NameCollisionOption.ReplaceExisting);
        }
    }
}