Revit二次开发高级应用（二）——怎样在Revit中使用多线程

版权声明： https://blog.csdn.net/niuge8905/article/details/82977376

在Revit中完全可以使用多线程，只是需要满足一定的规则：不改变Revit的Document文档的工作都可以在线程中完成，改变Document文档的工作都需要在主线程中完成。

如下：不改变文档，只是在线程里创建辅助的线，运行之后，丝毫不错。

namespace RevitUseThread
{
    [Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.Manual)]
    [Autodesk.Revit.Attributes.Journaling(Autodesk.Revit.Attributes.JournalingMode.NoCommandData)]
    public class Commad : IExternalCommand
    {
        public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
        {
            Thread thread=new Thread(() =>{
                for(var i=0;i<10;i++)
                {
                    Line line = Line.CreateUnbound(new XYZ(0,10* i, 0), new XYZ(10, 10*i, 0));
                }
                
            });
            thread.Start();
            return Result.Succeeded;
        }
    }
}

然后试一下在线程中创建模型线，模型线是元素，会改变Revit文档，如果这部分在线程里进行的话，会直接导致致命错误。

namespace RevitUseThread
{
    [Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.Manual)]
    [Autodesk.Revit.Attributes.Journaling(Autodesk.Revit.Attributes.JournalingMode.NoCommandData)]
    public class Commad : IExternalCommand
    {
        public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
        {
            Document revitDoc = commandData.Application.ActiveUIDocument.Document;
            Thread thread=new Thread(() =>{
                using (Transaction transaction = new Transaction(revitDoc, "创建模型线"))
                {
                    transaction.Start();
                    SketchPlane sketchPlane = SketchPlane.Create(revitDoc, Plane.CreateByNormalAndOrigin(XYZ.BasisZ,XYZ.Zero));
                    for (var i = 0; i < 10; i++)
                    {
                        Line line = Line.CreateUnbound(new XYZ(0, 10*i, 0), new XYZ(10, 10 * i, 0));
                        ModelCurve modelCurve = revitDoc.Create.NewModelCurve(line,sketchPlane);
                    }
                    transaction.Commit();
                }
            });
            thread.Start();
            return Result.Succeeded;
        }
    }
}

然后再在上面的基础上稍加修改，把修改文档的部分移出到线程以外就可以正常运行了。

namespace RevitUseThread
{
    [Autodesk.Revit.Attributes.Transaction(Autodesk.Revit.Attributes.TransactionMode.Manual)]
    [Autodesk.Revit.Attributes.Journaling(Autodesk.Revit.Attributes.JournalingMode.NoCommandData)]
    public class Commad : IExternalCommand
    {
        public Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)
        {
            Document revitDoc = commandData.Application.ActiveUIDocument.Document;
            CurveArray curveArray = new CurveArray();
            Thread thread=new Thread(() =>{
                for (var i = 0; i < 10; i++)
                {
                    Line line = Line.CreateBound(new XYZ(0, 10*i, 0), new XYZ(10, 10 * i, 0));
                    curveArray.Append(line);
                }
            });
            thread.Start();
            thread.Join();
            using (Transaction transaction = new Transaction(revitDoc, "创建模型线"))
            {
                transaction.Start();
                SketchPlane sketchPlane = SketchPlane.Create(revitDoc, Plane.CreateByNormalAndOrigin(new XYZ(0,0,1), XYZ.Zero));
                revitDoc.Create.NewModelCurveArray(curveArray, sketchPlane);
                transaction.Commit();
            }
            return Result.Succeeded;
        }
    }
}