'C# IOException Cannot locate resource

I have a C# project where I have some PNG files in a Images directory.

The structure of the project can be simplified to:

|
ViewModel.cs
View.xaml
|
[Images]
    \
    MapImageLayer16.png

In my view I bind to an object containing a string property ImagePath, pointing to ../Images/MapImageLayer16.png, and another string property Name:

<ListBox x:Name="DataLayerList" ItemsSource="{Binding LayersFiltered, Mode=OneWay}">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <StackPanel Orientation="Horizontal">
                <Image Source="{Binding Path=ImagePath}" Height="16"/>
                <TextBlock Text="{Binding Path=Name}"/>
            </StackPanel>
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

Now, the name comes trough fine. However, the image fails with the following description:

Failed to convert value '/Images/MapImageLayer16.png' (type 'String') to the target type using converter 'TargetDefaultValueConverter'. The fallback value will be used if it's available. IOException:'System.IO.IOException: Cannot locate resource 'images/mapimagelayer16.png'.

I tried all sorts of things by now:

  • changed the string value to ../Images/MapImageLayer16.png
  • changed the string value to pack://application:,,,/Images/MapImageLayer16.png
  • switched from string to Uri

Nothing works! How can I get the PNGs to show?

c++sharpxaml


Solution 1:[1]

  1. This is a common error when we forget to set the properties of the image as a Resource (on VisualStudio, Rightclic on the image > Properties > Build Action : Resource & Copy to OutputDirectory : Do not copy)

  2. You also need to bind a BitmapImage, and not a string, to the Xaml Image control. In your CS code, the ImagePath must become :

    public BitmapImage Source => new BitmapImage(new Uri(ImagePath, UriKind.Relative));

with ImagePath = "/Images/MapImageLayer16.png"

Solution 2:[2]

This looks like a typical WPF resource error to me. Open the {projectname}.csproj file and add this (adjust if necessary if the structure is not correct)

  <ItemGroup>
    <Resource Include="Images\MapImageLayer16.png" />
  </ItemGroup>

Not in "PropertyGroup" but in "Project" as it can be seen here

enter image description here

Sources

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Source: Stack Overflow

Solution Source
Solution 1 xspirata
Solution 2 Schecher_1

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