2

拜托，需要帮助。在这段代码中必须是愚蠢的错误，但它是什么？如果我运行这个非常简单的代码，我只能加载和更改一次位图图像。第一次运行正常，但如果我想再次更改图像（按下按钮），第一张图像仍然存在。为什么？

XAML

<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
    <StackPanel>
        <Button x:Name="AddProfilePicture"  HorizontalAlignment="Center" Click="AddProfilePicture_Click">
            <Grid Width="200" Height="200">
                <Ellipse Width="200" Height="200">
                    <Ellipse.Fill>
                        <ImageBrush x:Name="ImageBrush_ProfilePicture" Stretch="UniformToFill"/>
                    </Ellipse.Fill>
                </Ellipse>
            </Grid>
        </Button>
    </StackPanel>
</Grid>

代码

    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;
    }

此代码没有任何额外检查。这意味着图像“ProfilePicture.jpg”必须在运行应用程序之前位于文件夹中。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图片）即使文件夹中的源更改也无法更改屏幕上的输出。

4

2 回答 2

1

在创建BitmapImage时，将CreateOptions设置为IgnoreImageCache。

var profilePictureBitmap = new BitmapImage(profilePictureBitmapURI) {CreateOptions = BitmapCreateOptions.IgnoreImageCache};
于 2016-09-18T12:08:05.113 回答
0

尝试添加 Load() 方法，看看是否有帮助：

 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()
}
于 2016-09-18T11:36:34.170 回答