autocad.net将代码保存到图纸中，打开图纸后可以直接运行？

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http://blog.sina.com.cn/s/blog_49a9ee1401016843.html

By Adam Nagy

I would like to serialize my .NET class into an AutoCAD drawing database, so it is saved into the drawing, and I can recreate my class again (deserialize it), when the drawing is reopened. How could I do it?

Solution

You could use the .NET serialization technique to serialize your class into a binary stream and then you can save it in the drawing as a bunch of binary chunks. You could save the ResultBuffer to an object's XData or into an Xrecord.Data of an entity or an item in the Named Objects Dictionary (NOD). DevNote TS2563 tells you what the difference is between using XData and Xrecord. If you are saving it into an XData, then the ResultBuffer needs to start with a registered application name. Here is a sample which shows this:

  1 using System;
  2
  3 using System.Runtime.Serialization;
  4
  5 using System.Runtime.Serialization.Formatters.Binary;
  6
  7 using System.IO;
  8
  9 using System.Security.Permissions;
 10
 11
 12
 13 using Autodesk.AutoCAD.Runtime;
 14
 15 using acApp = Autodesk.AutoCAD.ApplicationServices.Application;
 16
 17 using Autodesk.AutoCAD.DatabaseServices;
 18
 19 using Autodesk.AutoCAD.EditorInput;
 20
 21
 22
 23 [assembly: CommandClass(typeof(MyClassSerializer.Commands))]
 24
 25
 26
 27 namespace MyClassSerializer
 28
 29 {
 30
 31  // We need it to help with deserialization
 32
 33
 34
 35  public sealed class MyBinder : SerializationBinder
 36
 37  {
 38
 39    public override System.Type BindToType(
 40
 41      string assemblyName,
 42
 43      string typeName)
 44
 45    {
 46
 47      return Type.GetType(string.Format("{0}, {1}",
 48
 49        typeName, assemblyName));
 50
 51    }
 52
 53  }
 54
 55
 56
 57  // Helper class to write to and from ResultBuffer
 58
 59
 60
 61  public class MyUtil
 62
 63  {
 64
 65    const int kMaxChunkSize = 127;
 66
 67
 68
 69    public static ResultBuffer StreamToResBuf(
 70
 71      MemoryStream ms, string appName)
 72
 73    {
 74
 75      ResultBuffer resBuf =
 76
 77        new ResultBuffer(
 78
 79          new TypedValue(
 80
 81            (int)DxfCode.ExtendedDataRegAppName, appName));
 82
 83
 84
 85      for (int i = 0; i < ms.Length; i += kMaxChunkSize)
 86
 87      {
 88
 89        int length = (int)Math.Min(ms.Length - i, kMaxChunkSize);
 90
 91        byte[] datachunk = new byte[length];
 92
 93        ms.Read(datachunk, 0, length);
 94
 95        resBuf.Add(
 96
 97          new TypedValue(
 98
 99            (int)DxfCode.ExtendedDataBinaryChunk, datachunk));
100
101      }
102
103
104
105      return resBuf;
106
107    }
108
109
110
111    public static MemoryStream ResBufToStream(ResultBuffer resBuf)
112
113    {
114
115      MemoryStream ms = new MemoryStream();
116
117      TypedValue[] values = resBuf.AsArray();
118
119
120
121      // Start from 1 to skip application name
122
123
124
125      for (int i = 1; i < values.Length; i++)
126
127      {
128
129        byte[] datachunk = (byte[])values[i].Value;
130
131        ms.Write(datachunk, 0, datachunk.Length);
132
133      }
134
135      ms.Position = 0;
136
137
138
139      return ms;
140
141    }
142
143  }
144
145
146
147  [Serializable]
148
149  public abstract class MyBaseClass : ISerializable
150
151  {
152
153    public const string appName = "MyApp";
154
155
156
157    public MyBaseClass()
158
159    {
160
161    }
162
163
164
165    public static object NewFromResBuf(ResultBuffer resBuf)
166
167    {
168
169      BinaryFormatter bf = new BinaryFormatter();
170
171      bf.Binder = new MyBinder();
172
173
174
175      MemoryStream ms = MyUtil.ResBufToStream(resBuf);
176
177
178
179      MyBaseClass mbc = (MyBaseClass)bf.Deserialize(ms);
180
181
182
183      return mbc;
184
185    }
186
187
188
189    public static object NewFromEntity(Entity ent)
190
191    {
192
193      using (
194
195        ResultBuffer resBuf = ent.GetXDataForApplication(appName))
196
197      {
198
199        return NewFromResBuf(resBuf);
200
201      }
202
203    }
204
205
206
207    public ResultBuffer SaveToResBuf()
208
209    {
210
211      BinaryFormatter bf = new BinaryFormatter();
212
213      MemoryStream ms = new MemoryStream();
214
215      bf.Serialize(ms, this);
216
217      ms.Position = 0;
218
219
220
221      ResultBuffer resBuf = MyUtil.StreamToResBuf(ms, appName);
222
223
224
225      return resBuf;
226
227    }
228
229
230
231    public void SaveToEntity(Entity ent)
232
233    {
234
235      // Make sure application name is registered
236
237      // If we were to save the ResultBuffer to an Xrecord.Data,
238
239      // then we would not need to have a registered application name
240
241
242
243      Transaction tr =
244
245        ent.Database.TransactionManager.TopTransaction;
246
247
248
249      RegAppTable regTable =
250
251        (RegAppTable)tr.GetObject(
252
253          ent.Database.RegAppTableId, OpenMode.ForWrite);
254
255      if (!regTable.Has(MyClass.appName))
256
257      {
258
259        RegAppTableRecord app = new RegAppTableRecord();
260
261        app.Name = MyClass.appName;
262
263        regTable.Add(app);
264
265        tr.AddNewlyCreatedDBObject(app, true);
266
267      }
268
269
270
271      using (ResultBuffer resBuf = SaveToResBuf())
272
273      {
274
275        ent.XData = resBuf;
276
277      }
278
279    }
280
281
282
283    [SecurityPermission(SecurityAction.LinkDemand,
284
285      Flags = SecurityPermissionFlag.SerializationFormatter)]
286
287    public abstract void GetObjectData(
288
289      SerializationInfo info, StreamingContext context);
290
291  }
292
293
294
295  [Serializable]
296
297  public class MyClass : MyBaseClass
298
299  {
300
301    public string myString;
302
303    public double myDouble;
304
305
306
307    public MyClass()
308
309    {
310
311    }
312
313
314
315    protected MyClass(
316
317      SerializationInfo info, StreamingContext context)
318
319    {
320
321      if (info == null)
322
323        throw new System.ArgumentNullException("info");
324
325
326
327      myString = (string)info.GetValue("MyString", typeof(string));
328
329      myDouble = (double)info.GetValue("MyDouble", typeof(double));
330
331    }
332
333
334
335    [SecurityPermission(SecurityAction.LinkDemand,
336
337      Flags = SecurityPermissionFlag.SerializationFormatter)]
338
339    public override void GetObjectData(
340
341      SerializationInfo info, StreamingContext context)
342
343    {
344
345      info.AddValue("MyString", myString);
346
347      info.AddValue("MyDouble", myDouble);
348
349    }
350
351
352
353    // Just for testing purposes
354
355
356
357    public override string ToString()
358
359    {
360
361      return base.ToString() + "," +
362
363        myString + "," + myDouble.ToString();
364
365    }
366
367  }
368
369
370
371  public class Commands
372
373  {
374
375    [CommandMethod("SaveClassToEntityXData")]
376
377    static public void SaveClassToEntityXData()
378
379    {
380
381      Database db = acApp.DocumentManager.MdiActiveDocument.Database;
382
383      Editor ed = acApp.DocumentManager.MdiActiveDocument.Editor;
384
385
386
387      PromptEntityResult per =
388
389        ed.GetEntity("Select entity to save class to:\n");
390
391      if (per.Status != PromptStatus.OK)
392
393        return;
394
395
396
397      // Create an object
398
399
400
401      MyClass mc = new MyClass();
402
403      mc.myDouble = 1.2345;
404
405      mc.myString = "Some text";
406
407
408
409      // Save it to the document
410
411
412
413      using (
414
415        Transaction tr = db.TransactionManager.StartTransaction())
416
417      {
418
419        Entity ent =
420
421          (Entity)tr.GetObject(per.ObjectId, OpenMode.ForWrite);
422
423
424
425        mc.SaveToEntity(ent);
426
427
428
429        tr.Commit();
430
431      }
432
433
434
435      // Write some info about the results
436
437
438
439      ed.WriteMessage(
440
441        "Content of MyClass we serialized:\n {0} \n", mc.ToString());
442
443    }
444
445
446
447    [CommandMethod("GetClassFromEntityXData")]
448
449    static public void GetClassFromEntityXData()
450
451    {
452
453      Database db = acApp.DocumentManager.MdiActiveDocument.Database;
454
455      Editor ed = acApp.DocumentManager.MdiActiveDocument.Editor;
456
457
458
459      PromptEntityResult per =
460
461        ed.GetEntity("Select entity to get class from:\n");
462
463      if (per.Status != PromptStatus.OK)
464
465        return;
466
467
468
469      // Get back the class
470
471
472
473      using (
474
475        Transaction tr = db.TransactionManager.StartTransaction())
476
477      {
478
479        Entity ent =
480
481          (Entity)tr.GetObject(per.ObjectId, OpenMode.ForRead);
482
483
484
485        MyClass mc = (MyClass)MyClass.NewFromEntity(ent);
486
487
488
489        // Write some info about the results
490
491
492
493        ed.WriteMessage(
494
495          "Content of MyClass we deserialized:\n {0} \n",
496
497          mc.ToString());
498
499
500
501        tr.Commit();
502
503      }
504
505    }
506
507  }
508
509 }

转载于:https://www.cnblogs.com/swtool/p/SWTOOL_00010.html

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