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。

注意上述代码会产生点问题，你会发现在程序跑的时候，构件是一个个生成的，这样给人感觉很奇怪。你需要将上述代码优化一下，将整个生成过程放在一个transaction里面。特别是有闲置程序在跑的时候，这种做法更安全，因为你在doevent的时候，很可能会让闲置程序也跟着跑，这明显会导致错误。因为老代码不见了，我懒得改，就用几句话代替。

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