IOException : 디자인 타임에만 리소스를 찾을 수 없음

Question

MVVM 프로젝트에서 내 디자이너에 문제가 있습니다.

내가 정의 DataTemplate와 TreeView 있습니다

       <DataTemplate> 
           <StackPanel Orientation="Horizontal"> 
            <Image Name="img" Width="20" Height="20" Stretch="Fill" 
             Source="{Binding 
             RelativeSource={RelativeSource 
             Mode=FindAncestor, 
             AncestorType={x:Type TreeViewItem}}, 
             Path=Header, 
             Converter={StaticResource HeaderToImageConverter}}"  
             /> 
            <TextBlock Text="{Binding}" Margin="5,0" /> 
           </StackPanel> 
          </DataTemplate> 

자원 선언 :

<Window x:Class="BlobWorld.MainWindow" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
     xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
     xmlns:Core="clr-namespace:BlobWorld;assembly=" 
     xmlns:helper="clr-namespace:BlobWorld.Helper" 
     mc:Ignorable="d" 
     Title="MainWindow" Height="350.459" Width="746.561" 
     DataContext="{DynamicResource MainWindowViewModel}"> 
    <Window.Resources> 
     <helper:HeaderToImageConverter x:Key="HeaderToImageConverter"/> 
    </Window.Resources> 

내 변환기는 다음과 같습니다

public class HeaderToImageConverter : IValueConverter 
    { 
     public object Convert(object value, Type targetType, object parameter, CultureInfo culture) 
     { 
      if ((value as string).Contains(@".")) 
      { 
       Uri uri = new Uri("pack://application:,,,/images/File.png"); 
       BitmapImage source = new BitmapImage(uri); 
       return source; 
      } 
      else 
      { 
       if (!(value as string).Contains(@":")) 
       { 
        Uri uri = new Uri("pack://application:,,,/images/folder.png"); 
        BitmapImage source = new BitmapImage(uri); 
        return source; 
       } 
       else 
       { 
        Uri uri = new Uri("pack://application:,,,/images/diskdrive.png"); 
        BitmapImage source = new BitmapImage(uri); 
        return source; 
       } 
      } 
     } 

     public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) 
     { 
      throw new NotSupportedException("Cannot convert back"); 
     } 
    } 

그것은 런타임에서 완벽하게 작동하지만, Visual Studio에서 xaml "디자인"창을 사용할 때 내 Windows의 모습을보고, 전 단지 가지고 IOException : Cannot locate resource 'images/folder.png'

어디에서 오는 내 문제는 무엇입니까? 어떻게 해결할 수 있습니까?

Answer 1

다음과 같이 DesignMode에서 실행 중인지 확인할 수 있습니다.

public class HeaderToImageConverter : IValueConverter 
    { 
     public object Convert(object value, Type targetType, object parameter, CultureInfo culture) 
     { 
      bool designMode = (LicenseManager.UsageMode == LicenseUsageMode.Designtime); 
      if (!designMode) 
      { 
       if ((value as string).Contains(@".")) 
       { 
        Uri uri = new Uri("pack://application:,,,/images/File.png"); 
        BitmapImage source = new BitmapImage(uri); 
        return source; 
       } 
       else 
       { 
        if (!(value as string).Contains(@":")) 
        { 
         Uri uri = new Uri("pack://application:,,,/images/folder.png"); 
         BitmapImage source = new BitmapImage(uri); 
         return source; 
        } 
        else 
        { 
         Uri uri = new Uri("pack://application:,,,/images/diskdrive.png"); 
         BitmapImage source = new BitmapImage(uri); 
         return source; 
        } 
       } 
      } 
     } 

     public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture) 
     { 
      throw new NotSupportedException("Cannot convert back"); 
     } 
    }