添加block快，不需要连接线，直接吸附。

AIStudio.Wpf.DiagramDesigner/UserControls/DiagramControl.xaml

@@ -217,7 +217,7 @@
                                 </Border>
                                 <Rectangle Fill="#7F243859" Opacity="0.5" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Visibility="{Binding ShouldInsertAnchor, Converter={StaticResource BooleanToVisibilityConverter}}">
                                     <i:Interaction.Behaviors>
-                                        <dd:ControlMouseLeftButtonDownCommandBehavior Command="{Binding AddItemCommand}" />
+                                        <dd:ControlMouseLeftButtonDownCommandBehavior Command="{Binding AddCommand}" />
                                     </i:Interaction.Behaviors>
                                 </Rectangle>
                             </Grid>
@@ -341,6 +341,36 @@
                 </dd:ConnectorContainer>
             </ControlTemplate>
 
+            <ControlTemplate x:Key="BlockConnectorDecoratorTemplate"
+                     TargetType="{x:Type Control}">
+                <Grid Margin="{Binding ConnectorMargin}">
+                    <dd:Connector 
+                        Content="{Binding LeftConnector}" 
+                        SnapsToDevicePixels="True"
+                        Orientation="Left"
+                        VerticalAlignment="Stretch"
+                        HorizontalAlignment="Left"/>
+                    <dd:Connector 
+                        Content="{Binding TopConnector}"
+                        SnapsToDevicePixels="True"
+                        Orientation="Top"
+                        VerticalAlignment="Top"
+                        HorizontalAlignment="Stretch"/>
+                    <dd:Connector 
+                        Content="{Binding RightConnector}"
+                        SnapsToDevicePixels="True"
+                        Orientation="Right"
+                        VerticalAlignment="Stretch"
+                        HorizontalAlignment="Right"/>
+                    <dd:Connector 
+                        Content="{Binding BottomConnector}"
+                        SnapsToDevicePixels="True"
+                        Orientation="Bottom"
+                        VerticalAlignment="Bottom"
+                        HorizontalAlignment="Stretch"/>                   
+                </Grid>
+            </ControlTemplate>
+
             <!--基础类型-->
             <Style x:Key="designerItemStyle"
                                 TargetType="{x:Type ContentPresenter}">
@@ -773,6 +803,92 @@
                     </Setter.Value>
                 </Setter>
             </Style>
+
+            <!--自带的block基础类型-->
+            <Style x:Key="blockItemStyle"
+                                TargetType="{x:Type ContentPresenter}">
+                <Setter Property="Canvas.Left"
+                                    Value="{Binding Left}" />
+                <Setter Property="Canvas.Top"
+                                    Value="{Binding Top}" />
+                <Setter Property="Canvas.ZIndex"
+                                    Value="{Binding ZIndex}" />
+                <Setter Property="dd:SelectionProps.EnabledForSelection"
+                                    Value="{Binding EnabledForSelection}" />
+                <Setter Property="Visibility"
+                                    Value="{Binding Visible,Converter={StaticResource BooleanToVisibilityConverter}}"/>
+                <Setter Property="Width"
+                                    Value="{Binding ItemWidth}" />
+                <Setter Property="Height"
+                                    Value="{Binding ItemHeight}" />
+                <Setter Property="MinWidth"
+                                    Value="{Binding MinItemWidth}" />
+                <Setter Property="MinHeight"
+                                    Value="{Binding MinItemHeight}" />
+                <Setter Property="SnapsToDevicePixels"
+                                    Value="True" />
+                <Setter Property="ContentTemplate">
+                    <Setter.Value>
+                        <DataTemplate>
+                            <Grid x:Name="selectedGrid" IsHitTestVisible="{Binding IsHitTestVisible}" >
+                                <Grid.ContextMenu>
+                                    <ContextMenu ItemsSource="{Binding MenuOptions}" Visibility="{Binding ShowMenuOptions,Converter={StaticResource BooleanToVisibilityConverter}}">
+                                        <ContextMenu.ItemContainerStyle>
+                                            <Style TargetType="MenuItem">
+                                                <Setter Property="MenuItem.Header" Value="{Binding Text}" />
+                                                <Setter Property="MenuItem.ItemsSource" Value="{Binding Children}" />
+                                                <Setter Property="MenuItem.Command" Value="{Binding Command}" />
+                                                <Setter Property="MenuItem.Icon" Value="{Binding Icon}" />
+                                                <Setter Property="CommandParameter" Value="{Binding CommandParameter}" />
+                                                <Setter Property="MenuItem.IsCheckable" Value="{Binding IsCheckable}" />
+                                                <Setter Property="MenuItem.IsChecked" Value="{Binding IsChecked}" />
+                                            </Style>
+                                        </ContextMenu.ItemContainerStyle>
+                                    </ContextMenu>
+                                </Grid.ContextMenu>
+
+                                <!-- PART_DragThumb -->
+                                <c:DragThumb x:Name="PART_DragThumb" 
+                                                            Cursor="SizeAll" >
+                                    <c:DragThumb.InputBindings>
+                                        <MouseBinding MouseAction="LeftDoubleClick" Command="{Binding EditCommand}" CommandParameter="{Binding }" />
+                                    </c:DragThumb.InputBindings>
+                                </c:DragThumb>
+
+                                <Grid RenderTransformOrigin="0.5,0.5" >
+
+                                    <!-- PART_ContentPresenter -->
+                                    <ContentPresenter x:Name="PART_ContentPresenter"
+                                                                HorizontalAlignment="Stretch"
+                                                                VerticalAlignment="Stretch"
+                                                                Content="{TemplateBinding Content}" />
+
+                                    <TextBlock x:Name="PART_Text" Text="{Binding Text}" IsHitTestVisible="False"/>
+
+                                    <!-- PART_ConnectorDecorator -->
+                                    <Control x:Name="PART_ConnectorDecorator" Template="{StaticResource BlockConnectorDecoratorTemplate}"/>
+
+                                </Grid>
+                            </Grid>
+                            <DataTemplate.Triggers>
+                                <DataTrigger Binding="{Binding Connectors.Count}" Value="0">
+                                    <Setter TargetName="PART_ConnectorDecorator" Property="Visibility" Value="Collapsed" />
+                                </DataTrigger>
+                            </DataTemplate.Triggers>
+                        </DataTemplate>
+                    </Setter.Value>
+                </Setter>
+                <Setter Property="Effect">
+                    <Setter.Value>
+                        <DropShadowEffect BlurRadius="10" Color="{Binding ColorViewModel.ShadowColor}"/>
+                    </Setter.Value>
+                </Setter>
+                <Style.Triggers>
+                    <DataTrigger Binding="{Binding ColorViewModel.ShadowColor}" Value="Transparent">
+                        <Setter Property="Effect" Value="{x:Null}"/>
+                    </DataTrigger>
+                </Style.Triggers>
+            </Style>
         </ResourceDictionary>
     </UserControl.Resources>
     <Grid>