fixed a bug of Dialog

src/Shared/HandyControlDemo_Shared/UserControl/Controls/DialogDemoCtl.xaml

@@ -9,7 +9,7 @@
              Background="{DynamicResource RegionBrush}"
              MinWidth="500"
              DataContext="{Binding DialogDemo,Source={StaticResource Locator}}">
-    <AdornerDecorator>
+    <hc:DialogContainer>
         <hc:TransitioningContentControl>
             <hc:SimplePanel>
                 <StackPanel Margin="32" VerticalAlignment="Center">
@@ -22,5 +22,5 @@
                 </StackPanel>
             </hc:SimplePanel>
         </hc:TransitioningContentControl>
-    </AdornerDecorator>
+    </hc:DialogContainer>
 </UserControl>

src/Shared/HandyControl_Shared/Controls/Dialog/Dialog.cs

@@ -14,7 +14,7 @@ namespace HandyControl.Controls
     {
         private string _token;
 
-        private Adorner _container;
+        private AdornerContainer _container;
 
         private static readonly Dictionary<string, FrameworkElement> ContainerDic = new Dictionary<string, FrameworkElement>();
 
@@ -107,35 +107,36 @@ namespace HandyControl.Controls
 
             FrameworkElement element;
 
+            AdornerDecorator decorator;
             if (string.IsNullOrEmpty(token))
             {
                 element = WindowHelper.GetActiveWindow();
+                decorator = VisualHelper.GetChild<AdornerDecorator>(element);
             }
             else
             {
                 ContainerDic.TryGetValue(token, out element);
+                decorator = element is System.Windows.Window ? 
+                    VisualHelper.GetChild<AdornerDecorator>(element) : 
+                    VisualHelper.GetChild<DialogContainer>(element);
             }
 
-            if (element != null)
+            if (decorator != null)
             {
-                var decorator = VisualHelper.GetChild<AdornerDecorator>(element);
-                if (decorator != null)
+                if (decorator.Child != null)
                 {
-                    if (decorator.Child != null)
+                    decorator.Child.IsEnabled = false;
+                }
+                var layer = decorator.AdornerLayer;
+                if (layer != null)
+                {
+                    var container = new AdornerContainer(layer)
                     {
-                        decorator.Child.IsEnabled = false;
-                    }
-                    var layer = decorator.AdornerLayer;
-                    if (layer != null)
-                    {
-                        var container = new AdornerContainer(layer)
-                        {
-                            Child = dialog
-                        };
-                        dialog._container = container;
-                        dialog.IsClosed = false;
-                        layer.Add(container);
-                    }
+                        Child = dialog
+                    };
+                    dialog._container = container;
+                    dialog.IsClosed = false;
+                    layer.Add(container);
                 }
             }
 
@@ -156,7 +157,7 @@ namespace HandyControl.Controls
 
         private void Close(DependencyObject element)
         {
-            if (element != null)
+            if (element != null && _container != null)
             {
                 var decorator = VisualHelper.GetChild<AdornerDecorator>(element);
                 if (decorator != null)

src/Shared/HandyControl_Shared/Controls/Dialog/DialogContainer.cs

@@ -0,0 +1,9 @@
+using System.Windows.Documents;
+
+namespace HandyControl.Controls
+{
+    public class DialogContainer : AdornerDecorator
+    {
+        
+    }
+}

src/Shared/HandyControl_Shared/HandyControl_Shared.projitems

@@ -27,6 +27,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Block\FloatingBlock.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Button\SplitButton.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Carousel\CarouselItem.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Controls\Dialog\DialogContainer.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Growl\GrowlWindow.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Image\ImageBlock.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Input\PinBox.cs" />
@@ -147,7 +148,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Carousel\Carousel.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Other\ChatBubble.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\ColorPicker\ColorPicker.cs" />
-    <Compile Include="$(MSBuildThisFileDirectory)Controls\Other\Dialog.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Controls\Dialog\Dialog.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Other\GotoTop.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Other\Gravatar.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Controls\Growl\Growl.cs" />

src/Shared/HandyControl_Shared/Tools/Helper/VisualHelper.cs

@@ -27,6 +27,7 @@ namespace HandyControl.Tools
 
         public static T GetChild<T>(DependencyObject d) where T : DependencyObject
         {
+            if (d == null) return default;
             if (d is T t) return t;
 
             for (var i = 0; i < VisualTreeHelper.GetChildrenCount(d); i++)