Windows phone null图像错误

Question

我正在开发一款适用于Windows手机的应用程序,它主要包括手机通讯录.我正在使用Contacts类获取所有电话联系人,并且我将联系人数据存储在隔离存储中.由于我无法序列化图像,我在序列化之前将它们转换为byte [].我的代码是:

foreach (var result in e.Results)
{
    if (result.PhoneNumbers.FirstOrDefault() != null)
    {

        BitmapImage bmp2 = new BitmapImage();
        bmp2.SetSource(result.GetPicture());


        listobj.Add(new AddressBook()
           {
               FirstName = result.DisplayName ?? "",
               imageBytes = AddressBook.imageConvert(bmp2),
               EmailAddress = "",
               LastName = "",
               Phone = result.PhoneNumbers.FirstOrDefault().PhoneNumber ?? "",
           });
    }
}

当Contact没有图片时,它会在行上显示Argument null异常错误:

bmp2.SetSource(result.GetPicture());

因此,当联系人图像为null时,我想使用一些自定义图像("/Images/ci2.png"或任何空白图像也可以使用).我的xaml代码是:

<StackPanel Margin="0,0,0,2" Orientation="Horizontal">
    <StackPanel Width="80" Orientation="Horizontal" Height="80">
        <Ellipse Margin="0" Height="70" Width="70" HorizontalAlignment="Left" Stroke="{x:Null}">
            <Ellipse.Fill>
                <ImageBrush Stretch="Fill" ImageSource="{Binding imageByte, Converter={StaticResource BytesToImageConverter}}"/>
            </Ellipse.Fill>
        </Ellipse>
    </StackPanel>
    <StackPanel Height="80" Margin="0" Width="380" HorizontalAlignment="Left">
        <TextBlock FontWeight="Bold"  Text="{Binding FirstName}" FontFamily="Segoe WP Semibold" FontSize="30" VerticalAlignment="Top" Margin="5,0,0,0" HorizontalAlignment="Left" />
        <TextBlock Text="{Binding Phone}" FontFamily="Segoe WP" FontSize="24" Margin="5,0,0,-12" Width="320" HorizontalAlignment="Left" VerticalAlignment="Top">
            <TextBlock.Foreground>
                <SolidColorBrush Color="#FFCFC9C9"/>
            </TextBlock.Foreground></TextBlock>
    </StackPanel>
</StackPanel>

我的问题是,我怎样才能使用自定义图像

 bmp2.SetSource(result.GetPicture());

一片空白？谢谢

Answer 1

快速看一下,你不能这样做:

if (result.GetPicture() != null)
{
     bmp2.SetSource(result.GetPicture());
}
else
{
     bmp2.SetSource(Application.GetResourceStream(new Uri(@"Images/ci2.png", UriKind.Relative)).Stream);
}

如果没有,我已经为此实现了不同的解决方案,并且可能会发布更多细节.