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C#操作CAD-读取和修改数据
我们操作cad最主要的目的就是读取和修改或者删除数据，因为内容较多，在此我们先讲一下基础，后续慢慢讲解。
1、cad数据读取和修改前都要进行锁定操作，以避免一个文档被多个用户修改而发生冲突。
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Database db = HostApplicationServices.WorkingDatabase; //当前数据库
using (Transaction tr = db.TransactionManager.StartTransaction())
//using,自动调用Dispose方法
{
//处理过程
tr.Commit();
//事务提交
}
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2、我们在处理过程中输入自己想要的代码就可以正常操作了，要不然会报错的。
然后我们就要进行图形数据的读取了，但是因为内容太多，所以会后续更新，在此简单附上一个在屏幕上选择单个实体的代码。
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public static Entity Select(string word)
{
Document doc =
Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument;
Database db = doc.Database; Editor ed = doc.Editor;
Entity entity = null;
PromptEntityResult ent = ed.GetEntity(word);
if (ent.Status == PromptStatus.OK)
{
using (Transaction transaction = db.TransactionManager.StartTransaction())
{
entity = (Entity)transaction.GetObject(ent.ObjectId, OpenMode.ForWrite, true);
transaction.Commit();
}
}
return entity;
}
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3、我们读取的数据一般都是多个，所以要进行遍历筛选处理。
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using (Transaction trans = db.TransactionManager.StartTransaction())
{
foreach (DBObject ob in texts)
{
DBText text = (DBText)transaction.GetObject(ob.ObjectId, OpenMode.ForWrite,
true);
………………………………操作内容
}
trans.Commit();
}
