使用FileOpenPicker窗口上传照片8.1

Question

当我编写以下代码时，我试图使用FileOpenPicker将照片上传到我的应用程序：

FileOpenPicker open = new FileOpenPicker();
open.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
open.ViewMode = PickerViewMode.Thumbnail;

// Filter to include a sample subset of file types
open.FileTypeFilter.Clear();
open.FileTypeFilter.Add(".bmp");
open.FileTypeFilter.Add(".png");
open.FileTypeFilter.Add(".jpeg");
open.FileTypeFilter.Add(".jpg");

// Open a stream for the selected file
StorageFile file = await open.PickSingleFileAsync();

// ImageSource im = (new Uri (file.Path));
ChildPic.Source = new BitmapImage(new Uri(file.Path));

它没有给我一个错误，但是图像控件是空白的。

路径中有值: C:\Users\Pictures\New文件夹(15).jpg

Answer 1

new BitmapImage(Uri)将不使用任何路径。它只支持URI的协议http，ms-appx，ms-appdata。你必须使用流。

FileOpenPicker open = new FileOpenPicker();
open.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
open.ViewMode = PickerViewMode.Thumbnail;

// Filter to include a sample subset of file types
open.FileTypeFilter.Clear();
open.FileTypeFilter.Add(".bmp");
open.FileTypeFilter.Add(".png");
open.FileTypeFilter.Add(".jpeg");
open.FileTypeFilter.Add(".jpg");

// Open a stream for the selected file
StorageFile file = await open.PickSingleFileAsync();

// ImageSource im = (new Uri (file.Path));
var bmp = new BitmapImage();
using (var strm = await file.OpenReadAsync())
{
    bmp.SetSource(strm);
    ChildPic.Source = bmp;
}