RevitTask

RevitTask is available as a Nuget package.

To be able to use this library in your Revit add-in, your project should also reference RevitAPIUI.dll.

The main purpose of the RevitTask class is to simplify work with IExternalEventHandler implementations, taking advantage of async/await style.

General use case is obtaining result of an arbitrary function that depends (or even not) on UIApplication.

CAUTION

RevitTask class is not intended to be used from an IExternalCommand context, though it may work well.

RevitTask class instances should not be created on non-Revit context threads, UI for example, because by default it continues on captured context. Meaning that you have to follow MVVM-pattern or the like and allocate tasks inside your ViewModel or Model layer.

Keep in mind that this library doesn't add any degree of parallelism to Revit, only asynchrony and a convenient way of returning results of ExternalEvent handlers and dealing with exceptions.

Example

    var task = new RevitTask();

    string mess = string.Empty;
    try
    {
        var i = await task.Run<int>(app => app.ActiveUIDocument
                            .Selection
                            .PickObjects(Autodesk.Revit.UI.Selection.ObjectType.Element)
                            .Count);

        mess = i.ToString();
    }
    catch (Exception ex)
    {
        mess = ex.Message;
    }

    Autodesk.Revit.UI.TaskDialog.Show("Deb", mess);

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