[用户交互] 让AutoCAD.NET支持后台线程

萧闫子

1. 
   
2. using System;
   
3. using Autodesk.AutoCAD.Runtime;
   
4. using System.Windows.Forms;
   
5. using Autodesk.AutoCAD.EditorInput;
   
6. using acApp = Autodesk.AutoCAD.ApplicationServices.Application;
   
7. using Autodesk.AutoCAD.ApplicationServices;
   
8. using Autodesk.AutoCAD.DatabaseServices;
   
9. using Autodesk.AutoCAD.Geometry;
   
10. 
    
11. namespace BackgroundProcess
    
12. {
    
13.   public class Commands : IExtensionApplication
    
14.   {
    
15.     static Control syncCtrl;
    
16.     public void Initialize()
    
17.     {
    
18.       // The control created to help with marshaling
    
19.       // needs to be created on the main thread
    
20.       syncCtrl = new Control();
    
21.       syncCtrl.CreateControl();
    
22.     }
    
23. 
    
24.     public void Terminate()
    
25.     {
    
26.     }
    
27. 
    
28.     void BackgroundProcess()
    
29.     {
    
30.       // This is to represent the background process
    
31.       System.Threading.Thread.Sleep(5000);
    
32. 
    
33.       // Now we need to marshall the call to the main thread
    
34.       // I don't see how this could ever be false in this context,
    
35.       // but I check it anyway
    
36.       if (syncCtrl.InvokeRequired)
    
37.         syncCtrl.Invoke(
    
38.           new FinishedProcessingDelegate(FinishedProcessing));
    
39.       else
    
40.         FinishedProcessing();
    
41.     }
    
42. 
    
43.     delegate void FinishedProcessingDelegate();
    
44.     void FinishedProcessing()
    
45.     {
    
46.       // If we want to modify the database, then we need to lock
    
47.       // the document since we are in session/application context
    
48.       Document doc = acApp.DocumentManager.MdiActiveDocument;
    
49.       using (doc.LockDocument())
    
50.       {
    
51.         using (Transaction tr =
    
52.           doc.Database.TransactionManager.StartTransaction())
    
53.         {
    
54.           BlockTable bt =
    
55.             (BlockTable)tr.GetObject(
    
56.             doc.Database.BlockTableId, OpenMode.ForRead);
    
57. 
    
58.           BlockTableRecord ms = (BlockTableRecord)tr.GetObject(
    
59.             bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite);
    
60. 
    
61.           Line line =
    
62.             new Line(new Point3d(0, 0, 0), new Point3d(10, 10, 0));
    
63.           ms.AppendEntity(line);
    
64.           tr.AddNewlyCreatedDBObject(line, true);
    
65. 
    
66.           tr.Commit();
    
67.         }
    
68.       }
    
69. 
    
70.       // Also write a message to the command line
    
71.       // Note: using AutoCAD notification bubbles would be
    
72.       // a nicer solution
    
73.       // TrayItem/TrayItemBubbleWindow
    
74.       Editor ed = acApp.DocumentManager.MdiActiveDocument.Editor;
    
75.       ed.WriteMessage("Finished the background process!\n");
    
76.     }
    
77. 
    
78.     [CommandMethod("rocessInBackground")]
    
79.     public void ProcessBackground()
    
80.     {
    
81.       // Let's say we got some data from the drawing and
    
82.       // now we want to process it in a background thread
    
83.       System.Threading.Thread thread =
    
84.         new System.Threading.Thread(
    
85.           new System.Threading.ThreadStart(BackgroundProcess));
    
86.       thread.Start();
    
87. 
    
88.       Editor ed = acApp.DocumentManager.MdiActiveDocument.Editor;
    
89.       ed.WriteMessage(
    
90.         "Started background processing. " +
    
91.         "You can keep working as usual.\n");
    
92.     }
    
93.   }
    
94. }

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