C# 为什么只能更改BitmapImage源一次？

求求你，需要帮助。在这段代码中一定是愚蠢的错误，但它是什么？如果我运行这个非常简单的代码，我只能加载和更改位图图像一次。第一次运行正常，但如果我想再次更改图像（按下按钮），第一个图像将保留。为什么?

XAML

此代码没有任何额外的检查。这意味着在运行应用程序之前，图像“ProfilePicture.jpg”必须位于文件夹中。代码在第一次运行时运行良好，但在第二次运行时（再次按下按钮并选择“新建图片”）无法更改屏幕上的输出，即使文件夹中的源代码发生了更改。

尝试添加Load（）方法，看看这是否有帮助：

 private async void AddProfilePicture_Click(object sender, RoutedEventArgs e)
{
    FileOpenPicker profilePictureFilePicker = new FileOpenPicker();
    profilePictureFilePicker.ViewMode = PickerViewMode.Thumbnail;
    profilePictureFilePicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
    profilePictureFilePicker.FileTypeFilter.Add(".jpg");
    StorageFile userSelectedProfilePicture = await profilePictureFilePicker.PickSingleFileAsync();
    //MAKE SURE U HAVE THIS FILE (ProfilePicture.jpg) IN FOLDER ALREADY....
    StorageFile destinationFileImage = await StorageFile.GetFileFromPathAsync(ApplicationData.Current.LocalFolder.Path + @"\" + "ProfilePicture.jpg");
    await userSelectedProfilePicture.CopyAndReplaceAsync(destinationFileImage);
    Uri profilePictureBitmapURI = new Uri(ApplicationData.Current.LocalFolder.Path + @"\" + "ProfilePicture.jpg");
    BitmapImage profilePictureBitmap = new BitmapImage(profilePictureBitmapURI);
    ImageBrush_ProfilePicture.ImageSource = profilePictureBitmap;
    ImageBrush_ProfilePicture.Load()
}

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创建位图图像时将创建选项设置为忽略图像缓存

var profilePictureBitmap = new BitmapImage(profilePictureBitmapURI) {CreateOptions = BitmapCreateOptions.IgnoreImageCache};

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替代方法：更改椭圆。在替换文件之前填充为null，然后用新文件创建新笔刷。这确实解决了问题！我猜是这样的，但根本不知道怎么做。（甚至尝试等待任务。延迟（5000）…哈）谢谢！PS.尝试更改椭圆ect。设置为null，但这些设置没有任何帮助：-）“在替换文件之前。”我想这是因为

.copyandresplaceasync（）

它以某种方式确定映像不再存在，所以它在缓存中使用了一个映像。

 private async void AddProfilePicture_Click(object sender, RoutedEventArgs e)
{
    FileOpenPicker profilePictureFilePicker = new FileOpenPicker();
    profilePictureFilePicker.ViewMode = PickerViewMode.Thumbnail;
    profilePictureFilePicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
    profilePictureFilePicker.FileTypeFilter.Add(".jpg");
    StorageFile userSelectedProfilePicture = await profilePictureFilePicker.PickSingleFileAsync();
    //MAKE SURE U HAVE THIS FILE (ProfilePicture.jpg) IN FOLDER ALREADY....
    StorageFile destinationFileImage = await StorageFile.GetFileFromPathAsync(ApplicationData.Current.LocalFolder.Path + @"\" + "ProfilePicture.jpg");
    await userSelectedProfilePicture.CopyAndReplaceAsync(destinationFileImage);
    Uri profilePictureBitmapURI = new Uri(ApplicationData.Current.LocalFolder.Path + @"\" + "ProfilePicture.jpg");
    BitmapImage profilePictureBitmap = new BitmapImage(profilePictureBitmapURI);
    ImageBrush_ProfilePicture.ImageSource = profilePictureBitmap;
    ImageBrush_ProfilePicture.Load()
}

var profilePictureBitmap = new BitmapImage(profilePictureBitmapURI) {CreateOptions = BitmapCreateOptions.IgnoreImageCache};