xBIM 高级03 更改日志创建
- 2019 年 10 月 4 日
- 筆記
模型中发生的每一个变化都是事务的一部分，这是我们设计的核心。所有事务都是由 IModel 的实现创建的，并且从中被弱引用，因此当使用 using 语句模型时，只要保留事务，就只保留对该事务的引用。这意味着有一个单一的点，所有的变化都在发生，我们可以用它们来做一些事情。
一件很重要的事情是记录所有的更改、以前的状态和下一个状态。将所有这些结合起来，您可以创建 back-log 或 forward-log。为了简化这个任务，我们实现了一个 xbim.io.delta.TransactionLog 类。在下面的示例中，我们将了解如何使用它。
using System; using Xbim.Common; using Xbim.Ifc; using Xbim.Ifc4.Interfaces; using Xbim.IO.Delta; using Xbim.IO.Step21; var editor = new XbimEditorCredentials { ApplicationDevelopersName = "You", ApplicationFullName = "Your app", ApplicationIdentifier = "Your app ID", ApplicationVersion = "4.0", EditorsFamilyName = "Santini Aichel", EditorsGivenName = "Johann Blasius", EditorsOrganisationName = "Independent Architecture" }; using (var model = IfcStore.Open("SampleHouse.ifc", editor, true)) { using (var txn = model.BeginTransaction("Modification")) { using (var log = new TransactionLog(txn)) { // 修改一个已经存在的 墙 对象 var wall = model.Instances.FirstOrDefault<IIfcWall>(); wall.Name = "Unexpected name"; wall.GlobalId = Guid.NewGuid().ToPart21(); wall.Description = "New and more descriptive description"; // 打印所有由此引起的更改 PrintChanges(log); txn.Commit(); } Console.WriteLine(); } }
private static void PrintChanges(TransactionLog log) { foreach (var change in log.Changes) { switch (change.ChangeType) { case ChangeType.New: Console.WriteLine(@"New entity: {0}", change.CurrentEntity); break; case ChangeType.Deleted: Console.WriteLine(@"Deleted entity: {0}", change.OriginalEntity); break; case ChangeType.Modified: Console.WriteLine(@"Changed Entity: #{0}={1}", change.Entity.EntityLabel, change.Entity.ExpressType.ExpressNameUpper); foreach (var prop in change.ChangedProperties) Console.WriteLine(@" Property '{0}' changed from {1} to {2}", prop.Name, prop.OriginalValue, prop.CurrentValue); break; default: break; } } }
生成的更改日志将如下所示。它包含更多的更改，因为当您更改或创建任何ifcroot实体时，xbim会自动为您处理所有者历史记录。
Changed Entity: #1229=IFCWALL Property 'Name' changed from 'Basic Wall:Wall-Ext_102Bwk-75Ins-100LBlk-12P:285330' to 'Unexpected name' Property 'OwnerHistory' changed from #42 to #83873 Property 'GlobalId' changed from '3cUkl32yn9qRSPvBJVyWw5' to '0zxW3$9z95n8U_H9YOcyiE' Property 'Description' changed from $ to 'New and more descriptive description' New entity: #83873=IFCOWNERHISTORY(#83876,#83877,$,.MODIFIED.,$,$,$,0); New entity: #83874=IFCPERSON($,'Santini Aichel','Johann Blasius',$,$,$,$,$); New entity: #83875=IFCORGANIZATION($,'Independent Architecture',$,$,$); New entity: #83876=IFCPERSONANDORGANIZATION(#83874,#83875,$); New entity: #83878=IFCORGANIZATION($,'You',$,$,$); New entity: #83877=IFCAPPLICATION(#83878,$,'Your app','Your app ID');
