在 Metro 应用程序中以编程方式设置图像源，图像不出现

我的应用程序中有一个主页和一个相机页面。主页有一个没有源集的图像和一个按钮。如果单击该按钮，它将带您进入相机页面。在相机页面上，我捕获图像并将其保存在平板电脑上的图片库中，然后导航回主页，我想将图像源设置为我刚刚捕获并保存在图片库中的图像。这是我的相关代码。

主页.xaml

<Image  x:Name="imgResume" HorizontalAlignment="Left" Height="303" Margin="975,60,0,0" Grid.Row="1" VerticalAlignment="Top" Width="360" Stretch="UniformToFill" Loaded="img_OnLoaded"/>
<Button x:Name="btnCamera" Content="Camera" HorizontalAlignment="Left" Margin="1128,372,0,0" Grid.Row="1" VerticalAlignment="Top" RenderTransformOrigin="2.05800008773804,0.184000000357628" Height="59" Width="108" Click="Camera_Click" IsEnabled="False"/>

MainPage.xaml.cs

private void img_OnLoaded(object sender, RoutedEventArgs e)
    {
        if (txtFirstName.Text != "" && txtLastName.Text != "")
        {
            try
            {
                imgResume.Source = ImageFromRelativePath(this, Windows.Storage.KnownFolders.PicturesLibrary.Path + ((App)Application.Current).candidate.FirstName + ((App)Application.Current).candidate.FirstName + "Resume.jpg");
                imgResume.UpdateLayout();
            }
            catch
            {
                imgResume.Source = ImageFromRelativePath(this, @"Assets/logo.png");
                imgResume.UpdateLayout();
            }
            btnCamera.IsEnabled = true;
        }
    }

    public static BitmapImage ImageFromRelativePath(FrameworkElement parent, string path)
    {
        var uri = new Uri(parent.BaseUri, path);
        BitmapImage result = new BitmapImage();
        result.UriSource = uri;
        return result;
    }

相机.xaml.cs

private async void Capture_Click(object sender, RoutedEventArgs e)
    {
        if (mediaCaptureMgr != null)
        {
            string firstName = ((App)Application.Current).candidate.FirstName;
            string lastName = ((App)Application.Current).candidate.LastName;
            string fileName = firstName + lastName + "Resume.jpg";

            Windows.Storage.IStorageFile photo = await Windows.Storage.KnownFolders.PicturesLibrary.CreateFileAsync(fileName, Windows.Storage.CreationCollisionOption.ReplaceExisting);

            await mediaCaptureMgr.CapturePhotoToStorageFileAsync(Windows.Media.MediaProperties.ImageEncodingProperties.CreateJpeg(), photo);

            this.Frame.Navigate(typeof(BasicPersonalInfo));
        }
    }

MainPage.xaml 文件中的 img_OnLoaded 方法尝试将图像源设置为我通过 Camera.xaml.cs 中的 Capture_click 方法保存到图片库的图像。

我的问题是图片从未出现在第一页的图像上！请帮忙！

这对于尝试解决从本地资源文件更新图像的相关问题的人们也可能有帮助。

myImage.Source = ImageFromRelativePath(this, "relative_path_to_file_make_sure_build_set_to_content");

public static BitmapImage ImageFromRelativePath(FrameworkElement parent, string path)
{
    var uri = new Uri(parent.BaseUri, path);
    BitmapImage result = new BitmapImage();
    result.UriSource = uri;
    return result;
}

代码来自here http://www.codingbeta.com/programatically-setting-image-source-in-metro-style-apps-with-wpf/.