AutoCAD .NET二次开发（四）

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[CommandMethod("GA", CommandFlags.Session)]
public void GetAttribute()
{

    //文档管理器
    DocumentCollection acDocMgr = Application.DocumentManager;
    //激活的文档
    Document acDoc = acDocMgr.MdiActiveDocument;
    Database acCurDb = acDoc.Database;
    using (acDoc.LockDocument())
    {
        // 启动事务
        using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
        {
            // 请求在图形区域选择对象
            PromptSelectionResult acSSPrompt = acDoc.Editor.GetSelection();
            // 如果提示状态OK，表示已选择对象
            if (acSSPrompt.Status == PromptStatus.OK)
            {
                SelectionSet acSSet = acSSPrompt.Value;
                //遍历选择集内的对象
                foreach (SelectedObject acSSObj in acSSet)
                {
                    // 确认返回的是合法的SelectedObject对象
                    if (acSSObj != null)
                    {
                        //获取实体
                        Entity acEnt = acTrans.GetObject(acSSObj.ObjectId, OpenMode.ForWrite) as Entity;
                        if (acEnt != null)
                        {
                            ////////以下是获取扩展属性的代码
                            //……
                        }
                        else
                        {
                            MessageBoxEx.Show("该实体为空！", "提示");
                        }
                    }
                }
                // 保存新对象到数据库
                acTrans.Commit();
            }
        }
    }
}

if (acEnt.XData != null)
{
    string result = "";
    Autodesk.AutoCAD.DatabaseServices.TypedValue[] valueArray = acEnt.XData.AsArray();
    for (int i = 0; i < valueArray.Length; i++)
    {
        result += i + "-" + valueArray[i].TypeCode + "-" + valueArray[i].Value + "
";
    }
    Console.WriteLine(result);
    System.Windows.Forms.MessageBox.Show(result);
}