step 1:先搞个转换器

 1 class ImageConvert : IValueConverter
 2     {
 3         public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
 4         {
 5             BitmapImage bi = new BitmapImage();
 6             // BitmapImage.UriSource must be in a BeginInit/EndInit block.
 7             bi.BeginInit();
 8             bi.UriSource = new Uri(value.ToString(), UriKind.Absolute);
 9             bi.EndInit();
10             return bi;
11         }
12 
13         public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
14         {
15             return null;
16         }
17     }

step 2:在前台页面添加转换器到资源

    <Window.Resources>
        <local:ImageConvert x:Key="ImageConvert"/>
    </Window.Resources>

step 3:在Image中绑定源，及转换器

 <Image x:Name="img" Source="{Binding ViewConfig.HomeBgPath, Converter={StaticResource ImageConvert}}"/>

其它的点，比如Binding之类的，自行百度好啦。