调整bug

Code/IVRFlowUI/FrmMain.cs

@@ -336,7 +336,17 @@ namespace IVRFlowUI
                             {
                                 if (canvas.NodeList.Find(a => a.ID == line.StartNodeID).GetType().GetProperty(line.AttributeName) != null)
                                     canvas.NodeList.Find(a => a.ID == line.StartNodeID).GetType().GetProperty(line.AttributeName).SetValue(canvas.NodeList.Find(a => a.ID == line.StartNodeID), canvas.NodeList.Find(a => a.ID == line.EndNodeID), null);
-                                canvas.AddALine(GetNewFlowLine(), canvas.NodeList.Find(a => a.ID == line.StartNodeID), canvas.NodeList.Find(a => a.ID == line.EndNodeID));
+                                if (line.StartNodeID != null && line.StartNodeID != "" && line.EndNodeID != null && line.EndNodeID != "")
+                                {
+                                    if (canvas.NodeList.Find(a => a.ID == line.StartNodeID) != null && canvas.NodeList.Find(a => a.ID == line.EndNodeID) != null)
+                                    {
+                                        canvas.AddALine(GetNewFlowLine(), canvas.NodeList.Find(a => a.ID == line.StartNodeID), canvas.NodeList.Find(a => a.ID == line.EndNodeID));
+                                    }
+                                    else
+                                    {
+                                        MessageBox.Show("流程文件中有不存在的结点");
+                                    }
+                                }
                             }
                             //2017-5-9
                             foreach (LineInfo line in ivrflow.FailLineNodes)