还有这事？真没测试过。 谢谢老师的指导... 测试代码
public static void test21()
{
Document doc = Application.DocumentManager.MdiActiveDocument;
Database db = doc.Database;
Editor ed = doc.Editor;
Random rand = new Random();
int num = ed.GetInteger("\n输入点数:").Value;
using (var tr = db.TransactionManager.StartTransaction())
{
db.Pdmode = 35;
db.Pdsize = -2;
var pnts =
Enumerable
.Range(0, num)
.Select(i => new DBPoint(new Point3d(rand.NextDouble() * 100, rand.NextDouble() * 100, 0)));
var btr = tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite) as BlockTableRecord;
foreach (var pnt in pnts)
{
btr.AppendEntity(pnt);
tr.AddNewlyCreatedDBObject(pnt, true);
}
tr.Commit();
}
}
public static void TransTest()
{
var db = HostApplicationServices.WorkingDatabase;
var doc = Application.DocumentManager.GetDocument(db);
var ed = doc.Editor;
var resSel = ed.SelectAll();
if (resSel.Status != PromptStatus.OK) return;
var ss = resSel.Value.GetObjectIds();
ed.WriteMessage("\n总共{0}个实体", ss.Length);
Stopwatch watch = new Stopwatch();
watch.Start();
using (Transaction tr = db.TransactionManager.StartTransaction())
{
foreach (var id in ss)
{
Entity ent = tr.GetObject(id, OpenMode.ForWrite) as Entity;
int color = ent.ColorIndex;
ent.ColorIndex = 1;
}
tr.Commit();
}
watch.Stop();
ed.WriteMessage("\n单事务使用tr.GetObject(StartTransaction)耗时:{0}毫秒", watch.ElapsedMilliseconds);
//watch.Reset();
//watch.Start();
//using (Transaction tr = db.TransactionManager.StartOpenCloseTransaction())
//{
// foreach (var id in ss)
// {
// Entity ent = tr.GetObject(id, OpenMode.ForWrite) as Entity;
// int color = ent.ColorIndex;
// ent.ColorIndex = 2;
// }
// tr.Commit();
//}
//watch.Stop();
//ed.WriteMessage("\n单事务使用tr.GetObject(StartOpenCloseTransaction)耗时:{0}毫秒", watch.ElapsedMilliseconds);
watch.Reset();
watch.Start();
using (Transaction tr = db.TransactionManager.StartTransaction())
{
foreach (var id in ss)
{
Entity ent = id.GetObject(OpenMode.ForWrite) as Entity;
int color = ent.ColorIndex;
ent.ColorIndex = 3;
}
tr.Commit();
}
watch.Stop();
ed.WriteMessage("\n单事务使用id.GetObject耗时:{0}毫秒", watch.ElapsedMilliseconds);
watch.Reset();
watch.Start();
foreach (var id in ss)
{
using (Transaction tr = db.TransactionManager.StartTransaction())
{
Entity ent = tr.GetObject(id, OpenMode.ForWrite) as Entity;
int color = ent.ColorIndex;
ent.ColorIndex = 4;
tr.Commit();
}
}
watch.Stop();
ed.WriteMessage("\n多事务使用tr.GetObject(StartTransaction)耗时:{0}毫秒", watch.ElapsedMilliseconds);
//watch.Reset();
//watch.Start();
//foreach (var id in ss)
//{
// using (Transaction tr = db.TransactionManager.StartOpenCloseTransaction())
// {
// Entity ent = tr.GetObject(id, OpenMode.ForWrite) as Entity;
// int color = ent.ColorIndex;
// ent.ColorIndex = 5;
// tr.Commit();
// }
//}
//watch.Stop();
//ed.WriteMessage("\n多事务使用tr.GetObject(StartOpenCloseTransaction)耗时:{0}毫秒", watch.ElapsedMilliseconds);
watch.Reset();
watch.Start();
foreach (var id in ss)
{
using (Transaction tr = db.TransactionManager.StartTransaction())
{
Entity ent = id.GetObject(OpenMode.ForWrite) as Entity;
int color = ent.ColorIndex;
ent.ColorIndex = 6;
tr.Commit();
}
}
watch.Stop();
ed.WriteMessage("\n多事务使用id.GetObject耗时:{0}毫秒", watch.ElapsedMilliseconds);
}结果：命令: transtest
总共10000个实体
单事务使用tr.GetObject(StartTransaction)耗时:394毫秒
单事务使用id.GetObject耗时:322毫秒
多事务使用tr.GetObject(StartTransaction)耗时:642毫秒
多事务使用id.GetObject耗时:676毫秒
命令:TRANSTEST
总共10000个实体
单事务使用tr.GetObject(StartTransaction)耗时:329毫秒
单事务使用id.GetObject耗时:318毫秒
多事务使用tr.GetObject(StartTransaction)耗时:631毫秒
多事务使用id.GetObject耗时:667毫秒
命令: tt1
input number of points: 50000
命令: transtest
总共60000个实体
单事务使用tr.GetObject(StartTransaction)耗时:1773毫秒
单事务使用id.GetObject耗时:1963毫秒
多事务使用tr.GetObject(StartTransaction)耗时:3899毫秒
多事务使用id.GetObject耗时:4155毫秒
命令: tt1
input number of points: 40000
命令: transtest
总共100000个实体
单事务使用tr.GetObject(StartTransaction)耗时:3011毫秒
单事务使用id.GetObject耗时:3426毫秒
多事务使用tr.GetObject(StartTransaction)耗时:6832毫秒
多事务使用id.GetObject耗时:7142毫秒 在单事务中两者相差并不大，甚至实体较少时id.GetObject还快些
多事务id.GetObject就很慢了
另外高版本使用StartOpenCloseTransaction效率更好
这个可以看看忽悠悠的测试
http://www.objectarx.net/forum.php?mod=viewthread&tid=4797&extra=page%3D1
ID.getobject在没有事务打开的时候就会出错。 01.命令: transtest
02.总共10000个实体
03.单事务使用tr.GetObject(StartTransaction)耗时:394毫秒
这些测试很有意义，效果很明显，看来处理多个对象时应该用tr.Getobject，反正也不增加代码量。
估计，Transaction与OpenCloseTransaction应该各有其适用性，只是目前文档匮乏，找不到更多依据。
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