将图片保存到数据库，并且加载图片

public class BinaryToImageConverter:IValueConverter

    {

        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)

        {

            if (value is Binary)

            {

                byte[] bytes = new byte[(value as Binary).Bytes.Length]; 

                bytes = (value as Binary).Bytes; 

                MemoryStream stream = new MemoryStream(bytes, 0, bytes.Length); 

                BitmapImage image = new BitmapImage();

                try

                {

                    image.SetSource(stream);

                    return image;

                }

                catch (Exception ex)

                {

                    MessageBox.Show(ex.ToString());

                }

            }

            if (value is String)

            {

                string s = value.ToString(); 

                return s + 1111;

            }

            return null;

        } 



        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)

        {

            throw new NotImplementedException();

        }

    }

<Grid x:Name="LayoutRoot" Background="White">

        <Grid.Resources>

            <silverlightApplication2:BinaryToImageConverter x:Key="BinaryConventer"></silverlightApplication2:BinaryToImageConverter>

        </Grid.Resources>

        <StackPanel>

            <Button x:Name="btselectfile" Height="30" Content="選擇文件" Click="btselectfile_Click"></Button>

            <Button x:Name="btshow" Height="30" Content="顯示圖片" Click="btupload_Click"></Button>

            <ListBox x:Name="ListBox" Height="260" SelectionChanged="ListBox_SelectionChanged">

                <ListBox.ItemTemplate>

                    <DataTemplate>

                        <StackPanel Orientation="Vertical">

                            <TextBlock Height="30" Text="{Binding ProductENname,Converter={StaticResource BinaryConventer}}" Width="100"></TextBlock>

                            <Image x:Name="Image" Height="100" Width="100" Source="{Binding ImageBinary, Converter={StaticResource BinaryConventer}}"></Image>

                            <!--<Image x:Name="Image" Height="100" Width="100" Source="{Binding ProductENname}"></Image>-->

                        </StackPanel>

                    </DataTemplate>

                </ListBox.ItemTemplate>

            </ListBox>

        </StackPanel>

    </Grid>