Initial porting attempt of my WinForms MVVM library to Avalonia; added IWindowScope as a new reature because this library should support Microsoft's dependency injector

Source/ViewModels/IDialogViewModel.cs

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+#region Apache License 2.0
+/*
+Nuclex Foundation libraries for .NET
+Copyright (C) 2002-2025 Markus Ewald / Nuclex Development Labs
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+#endregion // Apache License 2.0
+
+using System;
+using System.Threading.Tasks;
+
+using Nuclex.Support;
+
+namespace Nuclex.Windows.Forms.ViewModels {
+
+  /// <summary>Interface for dialog view models (typically modal ones)</summary>
+  public interface IDialogViewModel {
+
+    /// <summary>Indicates that the view should close</summary>
+    event EventHandler Submitted;
+
+    /// <summary>Indicates that the dialog should be closed</summary>
+    /// <returns>A task that finishes when the submit notification has been sent</returns>
+    Task SubmitAsync();
+
+  }
+
+} // namespace Nuclex.Windows.Forms.ViewModels