字节[]到位图图像 [英] Byte [] to Bitmap Image

问题描述

大家好

我是WP新手。我对图像有疑问。我有一个从数据库填充的列表框。此外，还有一个图像列来自SQL中的主表。然后，应用程序在列表框中显示这些列。除了图像之外，所有列都来自数据库
。图像从数据库填充为byte []。这就是为什么，它无法在应用程序中显示。我必须将所有byte [] s转换为bitmapimages。我的代码如下。请看一看。提前致谢。

I am new in WP. I have a question regarding to Images. I have a listbox which populates from database. Also, there is a image column which comes from main table in SQL. Then, the app displays these columns in a listbox. All the columns are coming from database good except images. Image is  populated from database as byte[]. That's why, it cannot be displayed in the app. I have to convert all byte[] s to bitmapimages. My code is below. Please have a look. Thanks in advance.

<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
            <ListBox Name="lstbox1" Margin="0,0,0,0" Tag="{Binding ID}" SelectedValuePath="{Binding Path=ID}" SelectionChanged="lstbox1_SelectionChanged" >
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <ListBoxItem x:Name="btn1" Width="460"  BorderThickness="2" Height="Auto"  BorderBrush="Black">
                            <ListBoxItem.Content>
                                <StackPanel Orientation="Horizontal" Height="80" Width="400">
                                    <Image Source="{Binding Image}" Width="80" Height="Auto"/>                                    
                                        <StackPanel Orientation="Horizontal" Height="Auto">                                           
                                            <TextBlock Width="Auto" FontSize="22" Text="{Binding Header}" Height="Auto"/>
                                        </StackPanel>                                        
                                </StackPanel>
                            </ListBoxItem.Content>
                        </ListBoxItem>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>
        </Grid>

 public void PhoneApplicationPage_Loaded(object sender, RoutedEventArgs e)
        {
            StudentServiceClient serviceClient = new StudentServiceClient();
            serviceClient.GetAllStudentsCompleted += new EventHandler<GetAllStudentsCompletedEventArgs>(serviceClient_GetAllStudentsCompleted);
            serviceClient.GetAllStudentsAsync();
        }
        void serviceClient_GetAllStudentsCompleted(object sender, GetAllStudentsCompletedEventArgs e)
        {            
            if (e.Result != null)
            {
                lstbox1.ItemsSource = e.Result;                
            }            
        }

推荐答案

你的照片是什么格式？它们是JPEG编码的吗？

What format are your pictures in? Are they JPEG encoded?

通常，您可以从byte [] - Array构造一个MemoryStream，并从该Stream加载Image。为了使用DataBinding，您必须将代码放在进行转换的ValueConverter中。

In general you can construct a MemoryStream from a byte[]-Array and load the Image from that Stream. In order to make that work with DataBinding you will have to put the code inside a ValueConverter that does the conversion.

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