如何在 WPF 中从图像源中释放图像
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How to release Image from Image Source in WPF
提问by Usher
Am loading image like below
正在加载如下图像
XAML
XAML
<Image Stretch="None" Grid.Row="16" Height="70" HorizontalAlignment="Left" Name="imgThumbnail" VerticalAlignment="Top" Width="70" Grid.RowSpan="3" Margin="133,1,0,0" Grid.Column="2" Grid.ColumnSpan="2" />
CodeBehind
代码隐藏
if (Path.GetFileNameWithoutExtension(filePath).ToLower().Contains(slugName.ToLower() + "_70x70"))
{
imgThumbnail.BeginInit();
imgThumbnail.Stretch = Stretch.UniformToFill;
imgThumbnail.Source = new BitmapImage(new Uri(filePath));
imgThumbnail.EndInit();
count = count + 1;
}
Above code work fine , now I have a delete button next to my thumbnail, if delete button called I suppose to delete all the images from the source location.
上面的代码工作正常，现在我的缩略图旁边有一个删除按钮，如果调用了删除按钮，我想从源位置删除所有图像。
Here is the code to delete the image files
这是删除图像文件的代码
internal int Remove(string slugName, DirectoryInfo outputFolder)
{
Helper.MetadataView.imgThumbnail.Source = null;
foreach (string filePath_ToBeDeleted in filePathList_ToBeDeleted)
{
if (File.Exists(filePath_ToBeDeleted))
{
Helper.MetadataView.imgThumbnail.IsEnabled = false;
File.Delete(filePath_ToBeDeleted);
count += 1;
}
}
return count;
}
return 0; // slugName == null
}
I tried to source to be null and delete, but it throws exception like below
我试图将 source 设为 null 并删除，但它抛出如下异常
The process cannot access the file '\serv1\Dev\Images\730_Test4_0406_70x70.jpg' because it is being used by another process.
该进程无法访问文件“\serv1\Dev\Images\730_Test4_0406_70x70.jpg”，因为它正被另一个进程使用。
Am not sure how to dispose, please someone guide me.
不知道怎么处理，求大神指点。
回答by Nikhil Agrawal
You should not use that Imagedirectly in your application if you want to delete or move it.
Image如果要删除或移动它，则不应直接在应用程序中使用它。
imgThumbnail.Source = new BitmapImage(new Uri(filePath));
Instead, do this:
相反，请执行以下操作：
BitmapImage image = new BitmapImage();
image.BeginInit();
image.CacheOption = BitmapCacheOption.OnLoad;
image.UriSource = new Uri(filePath);
image.EndInit();
imgThumbnail.Source = image;
For more read this
欲了解更多，请阅读本文
回答by Apfelkuacha
To have a good code-reuse a binding converter could be used:
为了实现良好的代码重用，可以使用绑定转换器：
namespace Controls
{
[ValueConversion(typeof(String), typeof(ImageSource))]
public class StringToImageSourceConverter : IValueConverter
{
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
if (!(value is string valueString))
{
return null;
}
try
{
ImageSource image = BitmapFrame.Create(new Uri(valueString), BitmapCreateOptions.IgnoreImageCache, BitmapCacheOption.OnLoad);
return image;
}
catch { return null; }
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
}
And there is a string for binding, for example
并且有一个用于绑定的字符串，例如
public string MyImageString { get; set; } = @"C:\test.jpg"
And in the UI the converter is used, in my case from the Library named "Controls"
在 UI 中使用了转换器，在我的例子中来自名为“Controls”的库
<Window x:Class="MainFrame"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:controls="clr-namespace:Controls;assembly=Controls">
<Window.Resources>
<controls:StringToImageSourceConverter x:Key="StringToImageSourceConverter" />
</Window.Resources>
<Grid>
<Image Source="{Binding MyImageString, Converter={StaticResource StringToImageSourceConverter}}" />
</Grid>
</Window>
