错误动态变化的背景 [英] Error in changing the background dynamically

问题描述

首先，我已经创建了用于动态更改背景图片（他们可以选择自己的图片作为背景）按钮（命名为BackgroundChooser）。但我已经使用了默认的背景图像（image1.jpg）为我的Windows Phone 7应用程序。当我在选择背景按钮点击，它引导我们保存的图片。从那以后，我选择了上午的图像作为我自己的背景图像。但是默认背景图像仍然不改变。
然后当我改变了默认背景为黑色，然后我可以将我自己的背景图像（它的工作完美）。需要帮助！！！预先感谢你们的辛勤工作！

First i've created a button(named as BackgroundChooser) that is used to change the background image dynamically(they can select their own image as background). But i have already used a default background image(image1.jpg) for my windows phone 7 application. When i click on the choose background button, it directs to our saved pictures. After that i have selected am image as my own background image. But the default background image is still doesn't changed. Then when i have changed the default background to black, then i can set my own background image(it's working perfectly). Need help!!! Thanks in advance for your hard work!!!

下面是我所使用的代码 -

Below is the code i have used-:

    private void BackgroundChooser_Click(object sender, MouseEventArgs e)
    {
        var PhotoChooser = new PhotoChooserTask();
        PhotoChooser.Completed += new EventHandler<PhotoResult(PhotoChooser_Completed);
        PhotoChooser.Show();
    }

    void PhotoChooser_Completed(object sender, PhotoResult e)
    {
        {
            if (e.TaskResult == TaskResult.OK)
            {
                System.Windows.Media.Imaging.BitmapImage bmp = new System.Windows.Media.Imaging.BitmapImage();
                bmp.SetSource(e.ChosenPhoto);
                var app = Application.Current as App;
                if (app == null)
                return;
                var imageBrush = new ImageBrush { ImageSource = bmp, Opacity = 0.5d };
                app.RootFrame.Background = imageBrush;
                //app.RootFrame.Background = new SolidColorBrush(Colors.Black);  //we can apply just color too like this
            }
        }
    }

推荐答案

而不是 app.RootFrame.Background ，可以尝试设置一些显示对象的背景属性您的网页上，如 myPanoramaControl.Background =的ImageBrush; 或 LayoutRoot.Background =的ImageBrush; （其中LayoutRoot是默认网格控件的名称一个新的WP页）

instead of app.RootFrame.Background, try setting the Background property on some display object on your page such as myPanoramaControl.Background = imageBrush; or LayoutRoot.Background = imageBrush; (where LayoutRoot is the name of the default grid control for a new WP Page)

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