Question

我为矩形创建了一个带有两个参数（par_l和par_h）的动态块。在这种情况下为什么不会发生什么？我假设par_l应该将项目扩展到500.默认情况下，我有100和100。我在程序中创建的块。通过c＃中的代码我想操纵它

[CommandMethod("Elem")]
        public void TestCommand()
        {
            Document doc = Application.DocumentManager.MdiActiveDocument;
            Database db = doc.Database;
            Editor ed = doc.Editor;

            Transaction tr = db.TransactionManager.StartTransaction();

                    BlockTable bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForWrite);
                    ed.WriteMessage(bt["prz_podl"]+"");

                    BlockTableRecord btr = tr.GetObject(bt["prz_podl"], OpenMode.ForWrite) as BlockTableRecord;

                    Point3d point = new Point3d(0, 0, 0);
                    BlockReference br = new BlockReference(point, btr.Id);
                    br.BlockTableRecord = btr.Id;

                    DynamicBlockReferencePropertyCollection properties = br.DynamicBlockReferencePropertyCollection;
                    for (int i = 0; i < properties.Count; i++)
                    {
                        DynamicBlockReferenceProperty property = properties[i];
                        if (property.PropertyName == "par_l")
                        {
                            ed.WriteMessage(property.Value+"");
                            property.Value = 500.0;
                        }
                    }
                   tr.Commit();  
        }

Answer 1

您必须将新创建的块引用附加到某些BlockTableRecord并将其添加到活动事务中。您还必须处理该交易。处理它将照顾所有用它打开或添加到其上的物体。

[CommandMethod("TEST")]
public void Test()
{
    var doc = AcAp.DocumentManager.MdiActiveDocument;
    var db = doc.Database;
    var ed = doc.Editor;

    using (var tr = db.TransactionManager.StartTransaction())
    {
        var bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForRead);
        // if the bloc table has the block definition
        if (bt.Has("prz_podl"))
        {
            // create a new block reference
            var br = new BlockReference(Point3d.Origin, bt["prz_podl"]);

            // add the block reference to the curentSpace and the transaction
            var curSpace = (BlockTableRecord)tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite);
            curSpace.AppendEntity(br);
            tr.AddNewlyCreatedDBObject(br, true);

            // set the dynamic property value
            foreach (DynamicBlockReferenceProperty prop in br.DynamicBlockReferencePropertyCollection)
            {
                if (prop.PropertyName == "par_l")
                {
                    prop.Value = 500.0;
                }
            }
        } 
        // save changes
        tr.Commit();
    } // <- end using: disposing the transaction and all objects opened with it (block table) or added to it (block reference)
}

在C＃中使用动态块（用于AutoCad）

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