事件处理过程中读取全局内容
本帖最后由 20033535 于 2012-2-13 19:32 编辑做了个块浏览器，带paletteset的那种，主要实现以下：
1、netload加载后即可用，无需其他启动命令。
2、编辑、删除、创建数据库对象后，自动更新paletteset里面的gridview内容。
3、切换文档后，自动更新paletteset里面的gridview内容。
目前遇到一个困难：在向数据库级的ObjectModified、ObjectErased、ObjectAppended事件中写更新gridview内容时CAD会报错；文档切换事件中更新gridview就没有问题。
我认为问题出现在这里：在数据库级的ObjectModified、ObjectErased、ObjectAppended事件处理过程中又读取了全局DataBase，所以报错。但是该怎么实现在删除/创建/改变事件中读取全局DataBase呢？
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Autodesk.AutoCAD.DatabaseServices;
using Autodesk.AutoCAD.EditorInput;
using Autodesk.AutoCAD.Geometry;
using Autodesk.AutoCAD.Runtime;
using Autodesk.AutoCAD.Windows;
using cadapp = Autodesk.AutoCAD.ApplicationServices;
namespace CADBlockBrowse
{
public class CAD : IExtensionApplication
{
private cadapp.Document CurDoc = cadapp.Application.DocumentManager.MdiActiveDocument;
private Database CurDB = cadapp.Application.DocumentManager.MdiActiveDocument.Database;
private Editor ed = cadapp.Application.DocumentManager.MdiActiveDocument.Editor;
private PaletteSet ps = new PaletteSet("块选择器");
private Hashtable BlockName_Count = new Hashtable();
private UserControl1 mycontrol = new UserControl1();
public CAD()
{
}
/// <summary>
/// 读取当前活动文档的所有块名、数量到Hashtable中
/// </summary>
/// <returns>返回Hashtable</returns>
public static Hashtable ReloadBlockNames()
{
Hashtable hs = new Hashtable();
Database db = cadapp.Application.DocumentManager.MdiActiveDocument.Database;
using (Transaction trans = db.TransactionManager.StartTransaction())
{
BlockTable bt = (BlockTable)trans.GetObject(db.BlockTableId, OpenMode.ForRead);
BlockTableRecord btr = (BlockTableRecord)trans.GetObject(db.CurrentSpaceId, OpenMode.ForRead);
foreach (ObjectId obj in btr)
{
Entity ent = (Entity)trans.GetObject(obj, OpenMode.ForRead);
if (ent.GetType() == typeof(BlockReference))
{
BlockReference brf = ent as BlockReference;
if (hs.ContainsKey(brf.Name))
{
int oc = Convert.ToInt32(hs);
hs = oc + 1;
}
else
{
hs.Add(brf.Name, 1);
}
}
}
}
return hs;
}
/// <summary>
/// 炸开所有块
/// </summary>
/// <param name="b_name">块名称</param>
public static void BlockSelectAndExplode(string b_name)
{
cadapp.Document doc = cadapp.Application.DocumentManager.MdiActiveDocument;
Database db = doc.Database;
Editor ed = doc.Editor;
Transaction transaction = db.TransactionManager.StartTransaction();
using (transaction)
{
Entity entity = null;
DBObjectCollection EntityCollection = new DBObjectCollection();
BlockTable bt = (BlockTable)transaction.GetObject(db.BlockTableId, OpenMode.ForRead);
BlockTableRecord btr = (BlockTableRecord)transaction.GetObject(db.CurrentSpaceId, OpenMode.ForRead);
cadapp.DocumentLock documentLock = doc.LockDocument();
foreach (ObjectId id in btr)
{
entity = (Entity)transaction.GetObject(id, OpenMode.ForWrite);
if (entity is BlockReference)
{
BlockReference br = (BlockReference)entity;
if (br.Name == b_name)
{
entity.Explode(EntityCollection);
entity.UpgradeOpen();
entity.Erase();
}
}
}
AddEntityCollection(EntityCollection, doc);
transaction.Commit();
documentLock.Dispose();
}
}
private static void AddEntityCollection(DBObjectCollection dbos, cadapp.Document doc)
{
Database db = doc.Database;
using (Transaction tran = db.TransactionManager.StartTransaction())
{
BlockTableRecord btr = (BlockTableRecord)tran.GetObject(db.CurrentSpaceId, OpenMode.ForWrite);
foreach (DBObject obj in dbos)
{
Entity ent = (Entity)obj;
btr.AppendEntity(ent);
tran.AddNewlyCreatedDBObject(ent, true);
}
tran.Commit();
}
}
public void Initialize()
{
ed.WriteMessage("\nInitialize函数中运行\n");
ps.Style = PaletteSetStyles.ShowAutoHideButton | PaletteSetStyles.ShowPropertiesMenu;
//ps.Dock = DockSides.None;
ps.DockEnabled = DockSides.Left | DockSides.Right | DockSides.None;
ps.MinimumSize = new System.Drawing.Size(150, 100);
ps.Size = new System.Drawing.Size(150, 100);
ps.Add("Palette1", mycontrol);
ps.Visible = true;
//注册文档切换事件
cadapp.Application.DocumentManager.DocumentActivated += new cadapp.DocumentCollectionEventHandler(DocumentManager_DocumentActivated);
//注册文档打开、创建事件
cadapp.Application.DocumentManager.DocumentCreated += new cadapp.DocumentCollectionEventHandler(DocumentManager_DocumentCreated);
//注册文档对象删除事件
cadapp.Application.DocumentManager.MdiActiveDocument.Database.ObjectErased += new ObjectErasedEventHandler(Database_ObjectErased);
//注册文档对象创建事件
//cadapp.Application.DocumentManager.MdiActiveDocument.Database.ObjectAppended += new ObjectEventHandler(Database_ObjectAppended);
UpdateGV();
}
void DocumentManager_DocumentCreated(object sender, cadapp.DocumentCollectionEventArgs e)
{
try
{
//MessageBox.Show("DocumentCreated Event:" + e.Document.Name);
//注册文档对象修改事件
//e.Document.Database.ObjectModified += new ObjectEventHandler(Database_ObjectModified);
//注册文档对象删除事件
e.Document.Database.ObjectErased += new ObjectErasedEventHandler(Database_ObjectErased);
//注册文档对象创建事件
//e.Document.Database.ObjectAppended += new ObjectEventHandler(Database_ObjectAppended);
UpdateGV();
}
catch (System.Exception ee)
{
cadapp.Application.ShowAlertDialog(ee.Message);
}
}
//void Database_ObjectAppended(object sender, ObjectEventArgs e)
//{
// //MessageBox.Show("ObjectAppended Event:" + e.DBObject.GetType().ToString());
// try
// {
// UpdateGV();
// }
// catch (System.Exception ee)
// {
// MessageBox.Show("ObjectAppended Error:" + ee.Message);
// }
//}
//private void Database_ObjectModified(object sender, ObjectEventArgs e)
//{
// //MessageBox.Show("ObjectModified Event:" + e.DBObject.GetType().ToString());
// UpdateGV();
//}
void Database_ObjectErased(object sender, ObjectErasedEventArgs e)
{
try
{
if (e.Erased)
{
UpdateGV();//我认为问题出现在这里：在事件处理过程中又读取了全局DataBase。但是该怎么实现在删除/创建/改变事件中读取全局DataBase呢？
}
}
catch (System.Exception ee)
{
MessageBox.Show("ObjectErased Error:" + ee.Message);
}
}
private void DocumentManager_DocumentActivated(object sender, cadapp.DocumentCollectionEventArgs e)
{
UpdateGV();
}
/// <summary>
/// 更新GridView的内容
/// </summary>
private void UpdateGV()
{
Hashtable bts = ReloadBlockNames();
if (bts.Count == 0)
{
mycontrol.bt_explode.Text = "无块";
mycontrol.bt_explode.Enabled = false;
}
else
{
mycontrol.bt_explode.Text = "炸开";
mycontrol.bt_explode.Enabled = true;
mycontrol.setdgvDataSource(bts);
}
}
public void Terminate()
{
}
}
}
标记一下，正在使用这些方法 非常复杂!为什么不把报什么错贴出来了,既然怀疑某个地方错,怎么不再那里继续检查,至少可以把那行代码干掉看看还会不会报错呀 本帖最后由 20033535 于 2012-2-14 18:25 编辑
其实问题也很简单。就是 Database.ObjectErased 这个数据库级的事件处理时，要读取全部的Database。这时会报错误。
如果不用注册事件，那就简单了，用命令启动。但是就没那么完美了。
有点类似这个http://bbs.mjtd.com/forum.php?mod=viewthread&tid=86739&extra=page%3D1%26filter%3Dtypeid%26typeid%3D81%26typeid%3D81
无需其他启动命令，好牛
更新paletteset里面的gridview内容，我正要学学怎么把块放到palette上呢
切换文档后，自动更新paletteset里面的gridview内容，我不想更新。
很好的方法。 楼主很牛嘛 楼主你好。我在做基于C#的CAD二次开发，想在自己做的dll里面调用sql数据库 可以吗？？？
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