这里有点特殊，因为我使用的是一个名为helix-toolkit的库，但请耐心等待。
问题是我想使用后台工作程序在我的代码中并行创建模型对象。
我知道多线程和处理 UI 元素存在一个大问题，但也许有一种解决方法。
这是我的代码的粗略结构：
我在其中创建 Backgroundwoker 的第一个文件，拆分创建 Geometry3D 对象的工作负载，最后调用SetModelGeometry将几何图形绑定到视口。第二个文件显示了绑定是如何完成的。
主窗口.xaml.cs
private void Draw_Building()
{
_worker = new BackgroundWorker { WorkerReportsProgress = true, WorkerSupportsCancellation = true };
_worker.DoWork += Draw_Building_DoWork;
_worker.ProgressChanged += DrawBuilding_ProgressChanged;
_worker.RunWorkerCompleted += DrawBuilding_RunWorkerCompleted;
_worker.RunWorkerAsync(10000);
}
private void Draw_Building_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e)
{
// returns a list containing Geometry3D objects ( created by meshBuilder.ToMeshGeometry3D() )
Geometryhandler.Draw_Building(sender, e);
}
private void DrawBuilding_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
StatusProgressBar.Value = e.ProgressPercentage;
var i = (int)e.UserState;
var actualComponent = MyBuildingComponents.First(c => c.Id == i);
LblStatusbarInfo.Text = "Currently meshing element #" + actualComponent.Globalid + " (" +
actualComponent.Objectname + ")";
StatusProgressbarMsg.Text = "Meshing (" + e.ProgressPercentage + " %)";
}
private void DrawBuilding_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
StatusProgressbarMsg.Text = "-";
StatusProgressBar.Value = 0;
LblStatusbarInfo.Text = "Meshing completed.";
Geometry = e.Result as List<MeshIdandGeometry>;
// creates MeshGeometryModel3D objects and binds them to the viewport using the List of Geometries
MainViewModel.SetModelGeometry(Geometry);
}
主视图模型.cs
public void SetModelGeometry(List<MeshIdandGeometry> geometry)
{
MyModelGeometry = new Element3DCollection();
if (geometry != null)
{
foreach (var mygeometry in geometry)
{
var s = new MeshGeometryModel3D
{
Geometry = mygeometry.Geometry,
Material = mygeometry.Material,
};
this.MyModelGeometry.Add(s);
s.Attach(MyModelViewport.RenderHost);
}
}
this.OnPropertyChanged("MyModelGeometry");
}
我目前的问题是以下错误消息：
调用线程无法访问此对象，因为不同的线程拥有它。
SetModelGeometry尝试将 附加ModelGeometry到视口时在函数中抛出。
我猜编译器抱怨几何图形是在不同的线程中创建的，他现在无法访问。
在不破坏 DrawBuilding 函数的并行执行的情况下，是否有任何解决方法/解决方案？
编辑：
编辑2：发布了错误的Draw_Building方法版本
中的Draw_Building方法Geometryhandler：
public void Draw_Building(object sender, DoWorkEventArgs e)
{
var geometry = new List<MeshIdandGeometry>();
var standardMaterial = new PhongMaterial()
{
AmbientColor = SharpDX.Color.LightGray,
//DiffuseColor = new Color4(0.35f, 0.35f, 0.35f, 1.0f),
//DiffuseMap = new BitmapImage(new System.Uri(@"Con_Diffuse_2.jpg", System.UriKind.RelativeOrAbsolute)),
//NormalMap = new BitmapImage(new System.Uri(@"Con_Normal_2.jpg", System.UriKind.RelativeOrAbsolute)),
};
var max = _mainWindow.MyBuildingComponents.Count;
var i = 1;
// Loop over building components
foreach (var component in _mainWindow.MyBuildingComponents)
{
//if (i == 5) break;
var component1 = component;
var componentTriangles = _mainWindow.MyTriangles.Where(triangle => triangle.ComponentId == component1.Id);
var meshBuilder = new MeshBuilder(true, true, true);
// Loop over triangles in building element
foreach (var triangle in componentTriangles)
{
var triangle1 = triangle;
var p1 = _mainWindow.MyVertices.Find(
vt => vt.Id == triangle1.PointId1);
var p2 = _mainWindow.MyVertices.Find(
vt => vt.Id == triangle1.PointId2);
var p3 = _mainWindow.MyVertices.Find(
vt => vt.Id == triangle1.PointId3);
if (p1 != null && p2 != null && p3 != null)
{
//meshBuilder.AddTriangle(new Vector3((float)p1.X, (float)p1.Y, (float)p1.Z),
// new Vector3((float)p2.X, (float)p2.Y, (float)p2.Z),
// new Vector3((float)p3.X, (float)p3.Y, (float)p3.Z));
// coordination are switched to match the coordinate system in SharpDX viewport
meshBuilder.AddTriangle(new Vector3(-(float)p1.Y, (float)p1.Z, -(float)p1.X),
new Vector3(-(float)p2.Y, (float)p2.Z, -(float)p2.X),
new Vector3(-(float)p3.Y, (float)p3.Z, -(float)p3.X));
}
}
var mesh = meshBuilder.ToMeshGeometry3D();
var meshandtriangle = new MeshIdandGeometry
{
Id = component1.Id,
Geometry = mesh,
Material = standardMaterial,
};
geometry.Add(meshandtriangle);
i++;
var progressPercentage = Convert.ToInt32(((double)i / max) * 100);
var backgroundWorker = sender as BackgroundWorker;
backgroundWorker?.ReportProgress(progressPercentage, component1.Id);
}
e.Result = geometry;
}