添加block快，不需要连接线，直接吸附。

AIStudio.Wpf.DiagramDesigner/ViewModels/IDiagramViewModel.cs

@@ -36,14 +36,6 @@ namespace AIStudio.Wpf.DiagramDesigner
         {
             get;
         }
-        ICommand AddItemCommand
-        {
-            get;
-        }
-        ICommand RemoveItemCommand
-        {
-            get;
-        }
         ICommand ClearSelectedItemsCommand
         {
             get;
@@ -113,6 +105,14 @@ namespace AIStudio.Wpf.DiagramDesigner
         {
             get;
         }
+        ICommand AddCommand
+        {
+            get;
+        }
+        ICommand DeleteCommand
+        {
+            get;
+        }
         ICommand CopyCommand
         {
             get;
@@ -125,10 +125,6 @@ namespace AIStudio.Wpf.DiagramDesigner
         {
             get;
         }
-        ICommand DeleteCommand
-        {
-            get;
-        }
         ICommand LeftMoveCommand
         {
             get;
@@ -340,7 +336,7 @@ namespace AIStudio.Wpf.DiagramDesigner
 
         void Add(object parameter, bool? isSelected = false);
 
-        void Remove(object parameter);
+        void Delete(object parameter);
 
         void ClearSelectedItems();
 
@@ -366,6 +362,7 @@ namespace AIStudio.Wpf.DiagramDesigner
         #region 公共方法
         FullyCreatedConnectorInfo FindNearPortToAttachTo(ConnectionViewModel partialConnection, ConnectorVertexType connectorVertexType);
         FullyCreatedConnectorInfo FindNearPortToAttachTo(ConnectionViewModel partialConnection);
+        Tuple<FullyCreatedConnectorInfo, FullyCreatedConnectorInfo> FindNearPortToAttachTo(BlockDesignerItemViewModel blockDesignerItemViewModel, bool isExist);
         void ClearNearPort();
         #endregion
         event PropertyChangedEventHandler PropertyChanged;