Revit二次开发——独立进程内读取、写入Revit文件

详解

不开启Revit，读取、写入Revit文件

要点：需要引入RevitNET.dll，RevitAddInUtility.dll和RevitAPI.dll三个dll到项目中

RevitAddInUtility.dll

此dll是Autodesk Revit 提供，用于方便开发者进行安装包的制作。使用此dll无需读注册表，可针对Revit版本，安装位置等信息的获取，也可以轻松的操控AddIn插件注册文件。此dll具体chm帮助文档，与此dll统一存在于Revit安装目录下。

RevitNET.dll

RevitNET.dll 在Revit安装目录下即可找到。此dll是Autodesk 用于开启一个简易版本、无任何UI界面的小型化 Revit 所进行封装的。也就是使用此dll可做到无需启动Revit便可进行创建、修改、读取等等操作。并且因为是无界面操作，其效率要比Revit更高。其具体使用方法，如下代码所示。Navsiworks 即是使用了此dll。感兴趣的朋友可以进行尝试研究。

     public class Program{static readonly string WorkPath = Path.GetDirectoryName(typeof(Program).Assembly.Location);static Program(){RevitCoreContext.Instance.Run();}/// <summary>/// Revit 内核必须加 STAThread 标签/// </summary>/// <param name="args"></param>[STAThread]static void Main(string[] args){var app = RevitCoreContext.Instance.Application;// Todo ...var projectrTemplate = app.DefaultProjectTemplate;if (!File.Exists(projectrTemplate)){throw new FileNotFoundException("默认项目路径不存在 , 请指定 !");}var document = app.NewProjectDocument(projectrTemplate);if (document == null){throw new InvalidOperationException();}// create wall demo ...var p1 = XYZ.Zero;var p2 = p1 + XYZ.BasisX * 10;var p3 = p2 + XYZ.BasisY * 10;var p4 = p1 + XYZ.BasisY * 10;var points = new XYZ[] { p1, p2, p3, p4 };document.Invoke(m =>{var level0 = document.QueryByType<Level>().OfType<Level>().FirstOrDefault(x => Math.Abs(x.Elevation - 0.0) <= 1e-7);if (level0 == null){level0 = Level.Create(document, 0);document.Regenerate();}for (int i = 0; i < points.Length; i++){var a = points[i];var b = i == points.Length - 1 ? points[0] : points[i + 1];Wall.Create(document, Line.CreateBound(a, b), level0.Id, false);}});document.SaveAs(Path.Combine(WorkPath, "demowall.rvt"));RevitCoreContext.Instance.Stop();}}

     public class RevitCoreContext{// 此路径为动态反射搜索路径 、 此路径可为任意路径（只要路径下有RevitNET 所需依赖项即可，完整依赖项可在 Naviswork 2016 下面找到）static readonly string[] Searchs = RevitProductUtility.GetAllInstalledRevitProducts().Select(x => x.InstallLocation).ToArray();static readonly object lockobj = new object();static RevitCoreContext _instance;private Product _product;public Application Application { get => _product.Application; }public static RevitCoreContext Instance{get{if (_instance == null){lock (lockobj){if (_instance == null){_instance = new RevitCoreContext();}}}return _instance;}}static RevitCoreContext(){AddEnvironmentPaths(Searchs);AppDomain.CurrentDomain.AssemblyResolve += OnAssemblyResolve;}public void Run(){_product = Product.GetInstalledProduct();var clientId = new ClientApplicationId(Guid.NewGuid(), "DotNet", "BIMAPI");// I am authorized by Autodesk to use this UI-less functionality. 必须是此字符串。 Autodesk 规定的._product.Init(clientId, "I am authorized by Autodesk to use this UI-less functionality.");}public void Stop(){_product?.Exit();}static void AddEnvironmentPaths(params string[] paths){var path = new[] { Environment.GetEnvironmentVariable("PATH") ?? string.Empty };var newPath = string.Join(System.IO.Path.PathSeparator.ToString(), path.Concat(paths));Environment.SetEnvironmentVariable("PATH", newPath);}private static Assembly OnAssemblyResolve(object sender, ResolveEventArgs args){var assemblyName = new AssemblyName(args.Name);foreach (var item in Searchs){var file = string.Format("{0}.dll", System.IO.Path.Combine(item, assemblyName.Name));if (File.Exists(file)){return Assembly.LoadFile(file);}}return args.RequestingAssembly;}}

 public static class DocumentExtension{public static void Invoke(this Document doc, Action<Transaction> action, string name = "default"){using (var tr = new Transaction(doc, name)){tr.Start();action(tr);var status = tr.GetStatus();switch (status){case TransactionStatus.Started:tr.Commit();return;case TransactionStatus.Committed:case TransactionStatus.RolledBack:return;case TransactionStatus.Error:tr.RollBack();return;default:return;}}}public static TResult Invoke<TResult>(this Document doc, Func<Transaction, TResult> func, string name = "default"){using (var tr = new Transaction(doc, name)){tr.Start();var result = func(tr);var status = tr.GetStatus();switch (status){case TransactionStatus.Started:tr.Commit();return result;case TransactionStatus.Committed:case TransactionStatus.RolledBack:return result;case TransactionStatus.Error:tr.RollBack();return result;default:return result;}}}public static void InvokeSub(this Document doc, Action<SubTransaction> action){using (var tr = new SubTransaction(doc)){tr.Start();action(tr);var status = tr.GetStatus();switch (status){case TransactionStatus.Started:tr.Commit();return;case TransactionStatus.Committed:case TransactionStatus.RolledBack:break;case TransactionStatus.Error:tr.RollBack();return;default:return;}}}public static TResult InvokeSub<TResult>(this Document doc, Func<SubTransaction, TResult> func){using (var tr = new SubTransaction(doc)){tr.Start();var result = func(tr);var status = tr.GetStatus();switch (status){case TransactionStatus.Started:tr.Commit();return result;case TransactionStatus.Committed:case TransactionStatus.RolledBack:return result;case TransactionStatus.Error:tr.RollBack();return result;default:return result;}}}public static void InvokeGroup(this Document doc, Action<TransactionGroup> action, string name = "default"){using (var tr = new TransactionGroup(doc, name)){tr.Start();action(tr);var status = tr.GetStatus();switch (status){case TransactionStatus.Started:tr.Commit();return;case TransactionStatus.Committed:case TransactionStatus.RolledBack:break;case TransactionStatus.Error:tr.RollBack();return;default:return;}}}public static TResult InvokeGroup<TResult>(this Document doc, Func<TransactionGroup, TResult> func, string name = "default"){using (var tr = new TransactionGroup(doc, name)){tr.Start();var result = func(tr);var status = tr.GetStatus();switch (status){case TransactionStatus.Started:tr.Commit();return result;case TransactionStatus.Committed:case TransactionStatus.RolledBack:return result;case TransactionStatus.Error:tr.RollBack();return result;default:return result;}}}public static FilteredElementCollector QueryByType<T>(this Document doc) where T : Element{return new FilteredElementCollector(doc).OfClass(typeof(T));}}

问题总结

1，异常：SEHException: 外部组件发生异常

解决方法：Revit 内核必须加 STAThread 标签
RevitCoreContext.Instance.Run();

2，在Windows应用程序提示无法加载RevitNET.dll。

可能的原因是：目标平台为Any CPU,首先32位。
应该取消首先32位的对勾，或者更改为X64 。
目标框架注意与引用的项目一致（主要针对其它dll）

3，如何跨线程访问吗？

将RevitNet封装为一个控制台应用程序（Revit启动程序），然后通过命令行去启动Revit启动程序。
在启动过程可以传入参数。

Process process=new Process();//AppDomain.CurrentDomain.BaseDirectory +
process.StartInfo.FileName = Path.Combine(AppDomain.CurrentDomain.BaseDirectory ,"ExportStart.exe");//执行的exe路径
process.StartInfo.UseShellExecute = false;//不显示shell
process.StartInfo.CreateNoWindow = true;//不创建窗口
process.StartInfo.RedirectStandardInput = true;//打开流输入
process.StartInfo.RedirectStandardOutput = true;//打开流输出
process.StartInfo.RedirectStandardError = true;//打开错误流
process.StartInfo.Arguments = "" + revitCmd + " \"" + filePathList.First() + "\"";//输入参数，多个参数使用空间分割，如果一个参数包含空格，使用""包括此参数
process.Start();//执行
string msg = process.StandardOutput.ReadToEnd();//读取输出
process.WaitForExit();//等待执行完成
process.Close();//结束

4，未能加载由“RevitNET.dll”导入的过程?

解决办法：
查看环境变量，将RevitInstallPath的path放至第一位。

5，不启动获取Revit文件的版本

     /// <summary>/// 获取Revit文件的版本/// </summary>/// <param name="path">文件路径</param>/// <returns></returns>public static string GetRevitVision(string path){string revitVision = null;FileStream stream = new FileStream(path, FileMode.Open);int size = 1024 * 1024;byte[] bytes = new byte[size];       while (stream.Read(bytes, 0, size) > 0){string str = Encoding.Unicode.GetString(bytes);string pattern = @"Autodesk Revit \d{4}";var match = Regex.Match(str, pattern);if (match.Success){revitVision = match.Value.Substring(match.Length - 4, 4);//File.WriteAllText(@"D:\abc.txt", str);break;}}return revitVision;}

6，程序运行目录（OutputDll）能否删除RevitAPI.dll或RevitAPIUI.dll等相关dll

可以，设置环境变量后，Revit会去Revit安装目录下查找以上dll。
注意：如果如果程序运行目录（OutputDll）存在Revit相关的dll，版本必须正确，否则会报错。（如果不能保证版本正确，不如将Revit相关dll全部删除）

7，RevitNet启动程序，能否取消RevitAddInUtility.dll的引用？

可以取消，RevitAddInUtility.dll 此dll的作用是用于获取Revit的安装目录，可以手动指定Revit的安装目录。从而取消此dll的引用。（完全可以不安装Revit，只复制Revit需要的dll,但区别那些dll是Revit需要的会很麻烦。不过可以将Revit安装目录下的文件全部复制到指定位置）