C# AutoCAD二次开发: 读取DWG文件将全部实体变为一个块。

/// <summary>
/// 将DWG文件所有DBObject组成一个块, 如果DWG文件中有属性, 则属性变为块属性
/// </summary>
/// <param name="insertPoint">插入点</param>
/// <param name="scale">插入比例</param>
/// <param name="blockName">块表记录名</param>
/// <param name="filePash">DWG文件路径</param>
/// <returns>块参照</returns>
public BlockReference InsertBlockReference(Point3d insertPoint, double scale, string blockName, string filePash)
{
    BlockReference blockReference = null;

    Document curDoc = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument; //获取当前文档
    using (DocumentLock docLock = curDoc.LockDocument()) //锁定文档
    {
        using (Transaction trans = curDoc.TransactionManager.StartTransaction()) //事务
        {
            try
            {
                BlockTable curBlockTb = trans.GetObject(curDoc.Database.BlockTableId, OpenMode.ForRead) as BlockTable; //当前文档块表
                ObjectId blockObjId = new ObjectId(); //用于块表记录的编号
                if (curBlockTb.Has(blockName) && !curBlockTb[blockName].IsErased) //块表中存在该块表记录, 并且没有被删除
                    blockObjId = curBlockTb[blockName];
                else
                {
                    if (!System.IO.File.Exists(filePash)) //不存在该文件
                    {
                        trans.Abort(); //事务终止
                        return blockReference;
                    }
                    Database sourceDB = new Database(false, true);
                    sourceDB.ReadDwgFile(filePash, FileShare.Read, true, null); //后台读取DWG文件信息; 参数: 文件名, 打开方式, 是否允许转换版本, 密码
                    blockObjId = curDoc.Database.Insert(blockName, sourceDB, false); //将一个数据库插入到当前数据库的一个块中; 参数: 新创建的块表记录名, 资源数据库, 资源数据库是否保存原样
                    sourceDB.CloseInput(true); //是否关闭ReadDwgFile()方法之后打开的文件
                    sourceDB.Dispose();
                }
                if (blockObjId != null)
                {
                    string layoutName = LayoutManager.Current.CurrentLayout; //获得当前布局空间
                    BlockTableRecord block = trans.GetObject(blockObjId, OpenMode.ForWrite) as BlockTableRecord; //根据块表记录编号获取的块表记录, 用于取得它的属性定义
                    block.Explodable = true; //块参照是否能被炸开
                    blockReference = new BlockReference(insertPoint, blockObjId); //新建块参照
                    BlockTableRecord layout = null; 
                    if (layoutName.Equals("Model"))
                        layout = trans.GetObject(curBlockTb[BlockTableRecord.ModelSpace], OpenMode.ForWrite) as BlockTableRecord; //根据当前布局空间获取的表块记录, 用于将块插入布局空间中
                    else
                        layout = trans.GetObject(curBlockTb[BlockTableRecord.PaperSpace], OpenMode.ForWrite) as BlockTableRecord;
                    layout.AppendEntity(blockReference); //在当前空间中追加此块参照
                    trans.AddNewlyCreatedDBObject(blockReference, true); 
                    if (!block.HasAttributeDefinitions) //如果该块表记录中不包含任何属性定义
                        goto No_AttributeDefinitions; //直接去往No_AttributeDefinitions

                    AttributeDefinition attriDef = null;
                    AttributeReference attriRefe = null;
                    Matrix3d mtr = Matrix3d.Displacement(block.Origin.GetVectorTo(insertPoint)); //Displacement 取代
                    foreach (ObjectId entityObjId in block) //遍历块表记录中的实体编号
                    {
                        attriDef = trans.GetObject(entityObjId, OpenMode.ForRead) as AttributeDefinition; //打开实体通过实体编号
                        if (attriDef == null) //若还是为null
                            continue;
                        attriRefe = new AttributeReference(); //每次循环new一次新的对象, 确保上次属性不会残留
                        attriRefe.SetPropertiesFrom(attriDef); //SetPropertiesFrom 设置属性来自
                        attriRefe.SetAttributeFromBlock(attriDef, mtr); //通过块设置属性 参数: 属性定义, 变形矩阵
                        attriRefe.TextString = ""; //设置属性值为""
                        blockReference.AttributeCollection.AppendAttribute(attriRefe); //块参照中添加此属性参照
                        trans.AddNewlyCreatedDBObject(attriRefe, true);
                        attriRefe = null;
                    }
                }
            No_AttributeDefinitions:
                blockReference.TransformBy(Matrix3d.Scaling(scale, insertPoint)); //缩放块; 修改块比例
                trans.Commit(); //提交事务
            }
            catch (System.Exception ex)
            {
                if (blockReference != null)
                {
                    blockReference = null;
                }
                return blockReference;
            }
        }
    }

    return blockReference;
}

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