WPF位图透明背景变为黑色 [英] WPF Bitmap transparent background turns black

问题描述

我有一个列表框，其中的项目都具有随机的背景颜色. 我想在列表框的每个项目中显示一个位图图片. 现在由于某种原因，每个位图的背景(我已将其设置为Color.Transparent)显示为黑色.

I have a listbox with Items that all have a random background color. In each Item of the listbox i want to display a Bitmap picture. Now for some reason the background of each bitmap (which I've set to Color.Transparent) Shows up black.

这里是它的外观图片

我在列表框中的代码:

 <WrapPanel  Grid.Row="1" Grid.Column="1" Margin="6" >
        <ListBox x:Name="CharListBox" BorderThickness="0" ScrollViewer.VerticalScrollBarVisibility="Hidden" 
                                        ItemsSource="{Binding ListToDisplay, UpdateSourceTrigger=PropertyChanged}"
                                        ItemTemplate="{DynamicResource ItemTemplate1}"
             SelectionChanged="SelectionChangedNewCharSelected">

        </ListBox>
    </WrapPanel>

项目模板(我将图像部分旁边的所有内容都删除了，以进行更好的展示)

The item template (I removed everything beside the image part for bettter overview):

  <DataTemplate x:Key="ItemTemplate1" >
        <Image Source="{Binding OutfitImageSource, UpdateSourceTrigger=PropertyChanged}" Height="40" Width="40" />
    </DataTemplate>

该绑定绑定到BitmapSource.

The Binding binds to a BitmapSource.

位图是否可能没有实际的透明度，只是显示为黑色? 我还尝试将AllowsTransparency="True"添加到窗口属性中，这只会导致窗口立即崩溃.

Is it possible that bitmaps dont have actual transparency, its just shown as black? I also tried to add AllowsTransparency="True" to the window properties, this just lead to the window crashing instantly..

谢谢您的帮助！

更新:如果我设置了WindowStyle="None"，则AllowsTransparency可以工作，但仍不能解决不透明位图的问题.

update: AllowsTransparency works if i set WindowStyle="None" but it still does not fix the problem with the untransparent bitmaps.

推荐答案

此 answer

位图(即扩展名为.BMP的文件)本身不支持透明性:您需要另存为PNG等格式.

Bitmaps (i.e. files with .BMP extension) do not natively support transparency: you need to save as a different format like PNG.

您也可以此处找到相同的信息.

You can find the same info also here.

因此它不取决于您的XAML或您的代码.只需将位图另存为PNG文件，然后将这些文件用于您的应用程序即可.

So it does not depend on your XAML or your code. Just save your bitmaps as PNG files and then use those files for your application.

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