在Metro应用程序编程设置图片来源，图像不会出现 [英] Setting Image source programatically in Metro app, Image doesn't appear

问题描述

我有一个主页，一个摄像头页面我的应用程序。主页具有不具有它的源集和一个按钮图象。如果您按一下按钮，它会带你到相机页面。在相机上，我捕捉图像，并将其保存在图片库在平板电脑上，然后再返回到主网页，我想设置图像我刚才拍摄的图像的来源，并保存在我的图片库。这是我的相关代码

I have a main page and a camera page in my application. The main page has an image that does not have its source set and a button. If you click the button, it will take you to the camera page. On the camera page, I capture an image and save it in the pictures library on the tablet and then navigate back to the main page where I would like to set the source of the image to the image I just captured and saved in my pictures library. Here is my relevant code.

MainPage.xaml中

MainPage.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中

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;
    }

Camera.xaml.cs

Camera.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));
        }
    }

在MainPage.xaml文件中的img_OnLoaded方法尝试设置图像源到我保存从Camera.xaml.cs的Capture_click方法的图像库中的图像

The img_OnLoaded method in the MainPage.xaml file is attempting to set the image source to the image that I save to the pictures library from the Capture_click method in the Camera.xaml.cs.

我的问题是，图象从未示出组成图像的第一页！请帮助！

My problem is that the picture never shows up on the image on the first page! Please help!

推荐答案

这也可能是有帮助的人试图解决从本地资源文件更新图像的相关问题

This may also be helpful to people trying to solve the related problem of updating an Image from a local resource file.

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;
}

代码是从的这里。

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