WPF中的脱机映像缓存 [英] Offline Image Cache in WPF

问题描述

我有一个WPF应用程序，其中  从URL加载图片 当有互联网连接& 
应从缓存中加载这些图像  ;每当没有活跃的互联网连接时。

我的  问题 是 - 图像未被缓存以显示在后续应用程序启动中
没有任何活动的互联网连接。

我搜索了几个小时，并尝试了几乎所有可能的组合  CreateOptions  &  CacheOption ，
，但结果有问题。

XAML代码是这样的：

 
<图片
宽度=" {Binding FOOD_TILE_W}" MaxWidth =" 380" 
 Height =" {Binding FOOD_TILE_H} " MaxHeight =" 240" 
 Stretch =" UniformToFill"> 
 
< Image.CacheMode> 
< BitmapCache EnableClearType =" False" 
 RenderAtScale =" 1" 
 SnapsToDevicePixels =" False" /> 
< /Image.CacheMode> 
 
< Image.Source> 
< ; BitmapImage UriSource =" {Binding ImageUrl}" 
 CreateOptions =" IgnoreImageCache" 
 CacheOption =" OnLoad" /> 
< /Image.Source> 
 
 < / Image> 
 
 

除了"绑定"代码之外，没有其他C＃代码。

是否有可能要实现我的目标？如果是，请怎么样？

解决方案

嗨Touhid，

BitmapImage  自动
默认缓存远程图像。最好与  CreateOptions =" BackgroundCreation"   for
the best performance。

< Image Height =" 100" Width =" ; 100" Margin =" 12,0,9,0"> 
< Image.Source> 
< BitmapImage UriSource =" {Binding ImgURL}" CreateOptions =" BackgroundCreation" /> 
< /Image.Source> 
< / Image> 

更详细的信息，请看一下：

https://stackoverflow.com/questions/17261114/image-source -and-caching / 17278222

最好的问候，

樱桃

I have a WPF app, which loads images from URL when there's internet connection & should load those images from cache whenever there's no active internet connection.

My problem is - images are not being cached to show in subsequent app-launches without any active internet connection.

I have searched for hours & tried almost all possible combinations of CreateOptions & CacheOption, but with the same problematic result.

The XAML code is like this:

                
             <Image
                   Width="{Binding FOOD_TILE_W}" MaxWidth="380" 
                   Height="{Binding FOOD_TILE_H}" MaxHeight="240" 
                   Stretch="UniformToFill">

                    <Image.CacheMode>
                        <BitmapCache  EnableClearType="False"
                              RenderAtScale="1"
                              SnapsToDevicePixels="False" />
                    </Image.CacheMode>

                    <Image.Source>
                        <BitmapImage UriSource="{Binding ImageUrl}" 
                             CreateOptions="IgnoreImageCache"
                             CacheOption="OnLoad"/>
                    </Image.Source>

                </Image>

There's no more C# code, except the `Binding` codes of course.

Is it possible to achieve what I am trying? If yes, please how?

解决方案

Hi Touhid,

BitmapImage automatically caches remote images by default. It's best used in conjunction with CreateOptions="BackgroundCreation" for the best performance.

<Image Height="100" Width="100" Margin="12,0,9,0">
  <Image.Source>
    <BitmapImage UriSource="{Binding ImgURL}" CreateOptions="BackgroundCreation"/>
  </Image.Source>
</Image>

More detailed info, please take a look:

https://stackoverflow.com/questions/17261114/image-source-and-caching/17278222

Best Regards,

Cherry

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