dialog host task was canceled issue #3824
Comments
AmeerMansour
added
bug
evaluation required
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even this throw exception var rrr= DialogHost.GetDialogSession (_mainWindow.GetDialogIdentifier()); |
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this is stack trace Exception thrown: 'System.Threading.Tasks.TaskCanceledException' in mscorlib.dll |
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@AmeerMansour I'm afraid I don't quite understand your problem.
Which would look something like this: public partial class MyVM : ObservableObject
{
public const string DIALOG_IDENTIFIER = "RootDialog";
[RelayCommand]
private async Task ShowDialogs()
{
// Intentionally not await this call so the 2nd dialog is shown automatically after 2 seconds
DialogHost.Show(CreateTextBlock("content 1"), DIALOG_IDENTIFIER);
await Task.Delay(2000);
DialogHost.Close(DIALOG_IDENTIFIER);
await DialogHost.Show(CreateTextBlock("content 2"), DIALOG_IDENTIFIER);
}
private static TextBlock CreateTextBlock(string text) =>
new()
{
Text = text,
Margin = new Thickness(16)
};
}However this works fine for me. Please provide more clear reproduction steps, or even better, a sample repo showcasing this bug. |
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It is quite complex to replicate the system. I will try to be clearer on my scenario.
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@AmeerMansour I have tried to replicate the scenario you describe, but I am not seeing the error, so I am probably doing something wrong compared to you. Perhaps you can elaborate a bit more. Let me explain what I have done: In the Main demo app of MDIX I have added a button on the start page. I have configured the private IHost? _host;
private void OpenDialogHostWindowButton_Click(object sender, RoutedEventArgs e)
{
if (_host is { } oldHost)
{
oldHost.Dispose();
}
_host = CreateHostBuilder([]).Build();
var launcher = _host.Services.GetRequiredService<DialogHostWindowLauncher>();
launcher.LaunchDialogHostWindow(_host);
}
public static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
.ConfigureServices((hostContext, services) =>
{
services.AddTransient<DialogHostWindowLauncher>(); // Also tried AddSingleton(); still works...
});This basically just creates a generic host where it adds a single service to the service collection, namely a internal class DialogHostWindowLauncher : IDisposable
{
private DialogHostWindow? _window;
public void LaunchDialogHostWindow(IHost host)
{
Thread newWindowThread = new(() =>
{
_window = new DialogHostWindow();
_window.Closing += (_, __) => host.Dispose();
_window.Show();
System.Windows.Threading.Dispatcher.Run();
});
newWindowThread.SetApartmentState(ApartmentState.STA);
newWindowThread.IsBackground = true;
newWindowThread.Start();
}
public void Dispose()
{
if (_window is { } window)
{
window.Dispatcher.BeginInvoke(() => window.Close());
}
}
}The dialog that it creates is just a simple Window which has <Window x:Class="MaterialDesignDemo.DialogHostWindow"
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:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
xmlns:local="clr-namespace:MaterialDesignDemo"
mc:Ignorable="d"
Style="{StaticResource MaterialDesignWindow}"
WindowStartupLocation="CenterScreen"
Title="DialogHostWindow" Height="450" Width="800">
<materialDesign:DialogHost ApplyBlurBackground="True" CloseOnClickAway="True">
<materialDesign:DialogHost.DialogContent>
<StackPanel Margin="50">
<TextBlock Text="This is some text in a DialogHost" />
<Button VerticalAlignment="Bottom" HorizontalAlignment="Center" Content="Close Dialog" Margin="10" Command="{x:Static materialDesign:DialogHost.CloseDialogCommand}" />
</StackPanel>
</materialDesign:DialogHost.DialogContent>
<Grid>
<Button VerticalAlignment="Bottom" HorizontalAlignment="Center" Content="Show Dialog" Margin="10" Command="{x:Static materialDesign:DialogHost.OpenDialogCommand}" />
</Grid>
</materialDesign:DialogHost>
</Window>With this setup, I can continuously open the window in its own UI thread, click the button and thus show the dialog in the newly opened window. Works both with a transient launcher as well as a singleton launcher. My guess is that your code for creating the host and/or creating the UI thread is somewhat different than this; could you help me better understand how your code looks? Thanks. |
nicolaihenriksen
added
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Waiting on feedback
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This issue is marked stale because it has been open 30 days with no activity. Remove stale label or update the issue, otherwise it will be closed in 14 days. |
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Bug explanation
I am using material design in developing addins for 3d softaware so I am using host the first time i uses dialog it shows correctly but when i end the host and start new one, it throw this exception !
how to fix this error ?
Version
5.2.1
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