Question

我正在构建一个Windows Phone 8.1应用程序并使用WinRT我需要从我的照片中捕获一张照片，并且需要将捕获的照片显示为列表。我写了下面的代码但是我无法运行它并且我收到错误。任何1可以纠正这个吗？

代码：

private async void BtnCapturePhoto_Click(object sender, RoutedEventArgs e)     
{         
    BtnCapturePhoto.IsEnabled = false;

    var photoStorageFile = await cameraCapture.CapturePhoto();         
    var bitmap = new BitmapImage();

    await bitmap.SetSourceAsync(await photoStorageFile.OpenReadAsync());

    PhotoListView.Items.Add(bitmap);
    BtnCapturePhoto.IsEnabled = true;       
}

错误：

以下是运行应用程序时的错误：

ERROR1

The best overloaded method match for 'Windows.UI.Xaml.Media.Imaging.BitmapSource.SetSourceAsync(Windows.Storage.Streams.IRandomAccessStream)' has some invalid arguments

错误2

Argument 1: cannot convert from 'void' to 'Windows.Storage.Streams.IRandomAccessStream'

错误3

'object' does not contain a definition for 'OpenReadAsync' and no extension method 'OpenReadAsync' accepting a first argument of type 'object' could be found (are you missing a using directive or an assembly reference?)

Answer 1

问题是photoStorageFile在你的代码中是一个System.Object类型，但它实际上是一个StorageFile，所以我们首先需要向下转换它。

// Get the photoStorageFile as StorageFile not System.Object
StorageFile photoStorageFile = await cameraCapture.CapturePhoto() as StorageFile;

// Now we can properly set the source of the bitmapImage
using (IRandomAccessStream fileStream = await photoStorageFile.OpenAsync(Windows.Storage.FileAccessMode.Read))
{
     // Set the image source to the selected bitmap
     BitmapImage bitmapImage = new BitmapImage();

     await bitmapImage.SetSourceAsync(fileStream);
     bitmap.Source = bitmapImage;
}

此代码应该可以使用

如何将照片列表添加到xaml页面的ListElement？

1 个答案: