Revit二次开发——利用Dispatcher类添加进度条

当程序运行时间很长，然后避免程序假死，比较好的办法是增加一个进度条，如果当前只有你的这一个功能在跑，用Dispatcher类是一个简单的好选择。

这里用wpf的窗口来实现。

public partial class ProgressBarView : Window
    {
        ExternalCommandData m_commandData=null;
        StrightRigidFrameBridgeModel m_model =null;
        Element m_element = null;
        ProgressModel m_ProgressModel;       
        bool applicationCancle =false;
        public ProgressBarView(ExternalCommandData commandData, StrightRigidFrameBridgeModel model,Element elem)
        {
            InitializeComponent();
            m_commandData = commandData;
            m_model = model;
            m_element = elem;
            ProgressModel pModel = new ProgressModel();
            m_ProgressModel = pModel;
            this.DataContext = pModel;
            applicationCancle = false;            
        } 
        public void StrightRigidFrameBridgeCreater(ExternalCommandData commandData, StrightRigidFrameBridgeModel model, Element elem)
        {
            using (TransactionGroup transGroup = new TransactionGroup(commandData.Application.ActiveUIDocument.Document, "Creat Rebar"))
            {
                transGroup.Start("Creat Stright Rigid Frame Bridge");
                ICollection<ElementId> elementIds = new List<ElementId>() { elem.Id };
            for (int i = 0; i < (model.ListBoxGriderModel.Count - 1); i++)
            {               
                m_ProgressModel.ProgressInfomation = "剩下" + (model.ListBoxGriderModel.Count - 1 - i-1).ToString() + "个节段";
                m_ProgressModel.ProgressValue= double.Parse(i.ToString())/ (model.ListBoxGriderModel.Count - 2) * 100;                          
                System.Windows.Forms.Application.DoEvents();

                BoxGriderModel boxGriderModelI = model.ListBoxGriderModel[i];
                BoxGriderModel boxGriderModelJ = model.ListBoxGriderModel[i + 1];
                #region 将表格的族参数赋予给对应的族参数

                #endregion
                
                    Transaction transaction1 = new Transaction(commandData.Application.ActiveUIDocument.Document);
                    transaction1.Start("改变族参数");
                    elem.LookupParameter("iH").Set(MillimetersToUnits(boxGriderModelI.XLG));            //变截面箱梁i截面的高度
                    elem.LookupParameter("iHI5").Set(MillimetersToUnits(boxGriderModelI.DBH));          //变截面箱梁i截面底板的高度
                    elem.LookupParameter("iT").Set(MillimetersToUnits(boxGriderModelI.FBH));         //变截面箱梁i截面腹板的宽度
                    elem.LookupParameter("iHI1").Set(MillimetersToUnits(boxGriderModelI.TBH));          //变截面箱梁i截面顶板的高度
                    elem.LookupParameter("jH").Set(MillimetersToUnits(boxGriderModelJ.XLG));            //变截面箱梁i截面的高度
                    elem.LookupParameter("jHI5").Set(MillimetersToUnits(boxGriderModelJ.DBH));          //变截面箱梁i截面底板的高度
                    elem.LookupParameter("jT").Set(MillimetersToUnits(boxGriderModelJ.FBH));         //变截面箱梁i截面腹板的宽度
                    elem.LookupParameter("jHI1").Set(MillimetersToUnits(boxGriderModelJ.TBH));          //变截面箱梁i截面顶板的高度
                    elem.LookupParameter("BeamLength").Set(MillimetersToUnits(boxGriderModelJ.JDCD));        //变截面箱梁节段长度
                    elem.LookupParameter("detZ").Set(MillimetersToUnits(boxGriderModelI.SJGC) - MillimetersToUnits(boxGriderModelJ.SJGC));        //变截面箱梁两个z截面的高差               
                    elem.LookupParameter("detY").Set(MillimetersToUnits(boxGriderModelI.Y_Coordinate) - MillimetersToUnits(boxGriderModelJ.Y_Coordinate));        //变截面箱梁两个z截面的高差               
                    transaction1.Commit();

                    #region 将改变参数后的族放到相应位置
                    Transaction transaction2 = new Transaction(commandData.Application.ActiveUIDocument.Document);
                    transaction2.Start("将族复制到相应位置");
                    XYZ point = new XYZ(MillimetersToUnits(boxGriderModelI.X_Coordinate), MillimetersToUnits(boxGriderModelI.Y_Coordinate), MillimetersToUnits(boxGriderModelI.SJGC));

                    LocationPoint familyInstancePoint = elem.Location as LocationPoint;
                    XYZ tanslationVector = point.Subtract(familyInstancePoint.Point);
                    ElementTransformUtils.CopyElements(commandData.Application.ActiveUIDocument.Document, elementIds, tanslationVector);
                    transaction2.Commit();
                    #endregion

                    if (applicationCancle == true)
                    {
                        break;
                    }
                }
             if(applicationCancle==true)
                    {                    
                    transGroup.RollBack();
                    this.Close();
                    }
             else
                {
                    transGroup.Assimilate();
                }               
            }
        }
        private double MillimetersToUnits(double value)
        {
            return UnitUtils.ConvertToInternalUnits(value, DisplayUnitType.DUT_MILLIMETERS);
        }

        private void window_Loaded(object sender, RoutedEventArgs e)
        {           
            Thread thread = new Thread(excute);
            thread.Start();

        }

        private void excute()
        {
            this.Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Normal, (ThreadStart)delegate () { StrightRigidFrameBridgeCreater(m_commandData, m_model, m_element); });
           
        }        

        private void cancelAsyncButton_Click(object sender, RoutedEventArgs e)
        {
            this.Dispatcher.BeginInvoke(System.Windows.Threading.DispatcherPriority.Normal, (ThreadStart)delegate () { applicationCancle = true;});

           
        }
    }
}

以上代码通过System.Windows.Forms.Application.DoEvents()来不断让程序在线程和主程序中来回切换，程序边计算一部分，然后进度条更新进度。

使用Dispartcher类注意用Try catch，并及时关掉线程。

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