AppDomain.CurrentDomain.BaseDirectory is Empty While Loading Media In WPF

Question

Hello,

I am working on a WPF window which supports multiple frameworks

<TargetFrameworks>net8.0-windows;net48</TargetFrameworks>

i have a media element in a window written

<MediaElement x:Name="Video"
                          LoadedBehavior="Manual" MaxHeight="450" MaxWidth="450"
                          Grid.Row="1"  Grid.Column="0" Grid.ColumnSpan="3"  VerticalAlignment="Center" HorizontalAlignment="Center" >
    <b:Interaction.Behaviors>
        <local:MediaElementBehavior MediaSource="{Binding Video}" />
    </b:Interaction.Behaviors>
</MediaElement>

while creating URI for the MediaSource i am getting URI is empty exception, upon stepping into the library and debugging i found out that

PresentationCore.dll!System.Windows.Media.MediaPlayerState.OpenMedia(System.Uri source) Line 589

if (source != null)

{
Uri baseDirectory = SecurityHelper.GetBaseDirectory(AppDomain.CurrentDomain);

Uri absoluteUri = ResolveUri(source, baseDirectory);

text = DemandPermissions(absoluteUri);
}

in the above code which resides in System.Windows.Media.MediaPlayerState , AppDomain.CurrentDomain.BaseDirectory is an empty string.

Note : System.Reflection.Assembly.GetExecutingAssembly().Location gives the working location but MediaPlayerState.cs library uses AppDomain.CurrentDomain.BaseDirectory is empty.

Answer 1

Hi @Bhat Sanjay Subrahmanya (SX/ETM12-EM) , Welcome to Microsoft Q&A,

You can try to use AppContext.BaseDirectory instead of AppDomain.CurrentDomain.BaseDirectory in .Net 8.0.

Uri baseDirectory = new Uri(AppContext.BaseDirectory);
Uri absoluteUri = ResolveUri(source, baseDirectory);

You can use AppContext.BaseDirectory for URI resolution by modifying the MediaElementBehavior or related binding code.

Best Regards,

Jiale

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