正在从SQLite c#Windows应用程序加载图像

本文关键字：应用程序 加载 图像 c#Windows SQLite | 更新日期: 2023-09-27 18:27:34

我得到错误："App2.exe中发生了类型为"System.ArgumentException"的异常，但未在用户代码中处理，其他信息：值不在预期范围内"。

这是在尝试将图像加载到我的应用程序时发生的。我有下面的代码从我的数据库加载图像。filename变量返回："Y:''''Pictures''''Cake.jpg"，这是我试图加载的图像路径。感谢您的帮助。

            string FilePath = @"Y:'Pictures'";
            FileName = FilePath + ms.RecipeImage;
            StorageFile file = await StorageFile.GetFileFromApplicationUriAsync(new Uri(FileName, UriKind.Absolute));
            IRandomAccessStream filestream = await file.OpenAsync(Windows.Storage.FileAccessMode.Read);
            BitmapImage bmpImage = new BitmapImage();
            bmpImage.SetSource(filestream);
            image.Source = bmpImage;

保存到数据库：

public async void imageButton_Click(object sender, RoutedEventArgs e)
    {
        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();
        // Ensure a file was selected
        if (file != null)
        {
            // Ensure the stream is disposed once the image is loaded
            using (IRandomAccessStream fileStream = await file.OpenAsync(Windows.Storage.FileAccessMode.Read))
            {
                // Set the image source to the selected bitmap
                BitmapImage bitmapImage = new BitmapImage();
                bitmapImage.DecodePixelHeight = 200;
                bitmapImage.DecodePixelWidth = 200;
                await bitmapImage.SetSourceAsync(fileStream);
                image.Source = bitmapImage;
            }
        }          
    }

正在从SQLite c#Windows应用程序加载图像

根据本页：https://msdn.microsoft.com/de-de/library/windows/apps/windows.storage.storagefile.getfilefromapplicationuriasync您只能将GetFileFromApplicationUriAsync与这些URI格式"ms-appx://"或"ms-app/"一起使用。例如，您应该能够使用此方法从assets文件夹加载资源。

编辑：无法访问所有文件和文件夹(https://msdn.microsoft.com/en-us/library/windows/apps/mt188700.aspx)。但在您的情况下，这应该可以工作（如果您要加载的文件位于我的图片文件夹中）。

var filestream = await Windows.Storage.KnownFolders.PicturesLibrary.OpenStreamForReadAsync("Screenshots''Screenshot (1).png");
InMemoryRandomAccessStream ras = new InMemoryRandomAccessStream();
await filestream.CopyToAsync(ras.AsStreamForWrite());
BitmapImage bmpImage = new BitmapImage();
bmpImage.SetSource(ras);
image.Source = bmpImage;

不要忘记选中软件包中的图片库复选框。appxmanifest.

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