Project's calculation modes

Project Calculation Modes

Aspose.Tasks for .NET API provides three project calculation modes which define how values of dependent properties are calculated when the value of a property is set. These calculation modes are:

• None - Sets only necessary properties and does not perform any calculations
• Manual - Sets only dependent object properties without recalculation of any other data
• Automatic - Recalculates dates, work and cost properties automatically

This examples below shows the usage of each of these with the help of code samples.

Project Calculation Mode - None

// Create empty project and set calculation mode to None
Project project = new Project();
project.CalculationMode = CalculationMode.None;

// Add a new task
Task task = project.RootTask.Children.Add("Task");

// Note that even ids were not calculated
Console.WriteLine("Task.Id Equals 0 : {0} ",  task.Get(Tsk.Id).Equals(0));
Console.WriteLine("Task.OutlineLevel Equals 0 : {0} ", task.Get(Tsk.OutlineLevel).Equals(0));
Console.WriteLine("Task Start Equals DateTime.MinValue : {0} ", task.Get(Tsk.Start).Equals(DateTime.MinValue));
Console.WriteLine("Task Finish Equals DateTime.MinValue : {0} ", task.Get(Tsk.Finish).Equals(DateTime.MinValue));
Console.WriteLine("Task Duration Equals 0 mins : {0} ", task.Get(Tsk.Duration).ToString().Equals("0 mins"));

// Set duration property
task.Set(Tsk.Duration, project.GetDuration(2, TimeUnitType.Day));
Console.WriteLine("Task Duration Equals 2 days : {0} ", task.Get(Tsk.Duration).ToString().Equals("2 days"));
Console.WriteLine("Task Start Equals DateTime.MinValue  : {0} ", task.Get(Tsk.Start).Equals(DateTime.MinValue));
Console.WriteLine("Task Finish Equals DateTime.MinValue  : {0} ", task.Get(Tsk.Finish).Equals(DateTime.MinValue));

Project Calculation Mode - Manual

// Create empty project and set calculation mode to Manual
Project project = new Project();
project.CalculationMode = CalculationMode.Manual;

// Set project start date and add new tasks
project.Set(Prj.StartDate, new DateTime(2015, 4, 15));
Task task1 = project.RootTask.Children.Add("Task 1");
Task task2 = project.RootTask.Children.Add("Task 2");

// The necessary properties are set in manual mode
Console.WriteLine("Task1.Id Equals 1 : {0} ", task1.Get(Tsk.Id).Equals(1));
Console.WriteLine("Task1 OutlineLevel Equals 1 : {0} ", task1.Get(Tsk.OutlineLevel).Equals(1));
Console.WriteLine("Task1 Start Equals 15/04/2015 08:00 AM : {0} ", task1.Get(Tsk.Start).Equals(new DateTime(2015, 4, 15, 8, 0, 0)));
Console.WriteLine("Task1 Finish Equals 15/04/2015 05:00 PM : {0} ", task1.Get(Tsk.Finish).Equals(new DateTime(2015, 4, 15, 17, 0, 0)));
Console.WriteLine("Task1 Duration Equals 1 day : {0} ", task1.Get(Tsk.Duration).ToString().Equals("1 day"));
Console.WriteLine("Task2 Start Equals 15/04/2015 08:00 AM : {0} ", task2.Get(Tsk.Start).Equals(new DateTime(2015, 4, 15, 8, 0, 0)));
Console.WriteLine("Task2 Finish Equals 15/04/2015 05:00 PM : {0} ", task2.Get(Tsk.Finish).Equals(new DateTime(2015, 4, 15, 17, 0, 0)));
Console.WriteLine("Task2 Duration Equals 1 day : {0} ", task2.Get(Tsk.Duration).ToString().Equals("1 day"));

// When we link two tasks together their dates are not recalculated in manual mode
TaskLink link = project.TaskLinks.Add(task1, task2, TaskLinkType.FinishToStart);

// Task 2 Start has not been changed
Console.WriteLine("Task1 Start Equals Task2 Start : {0} ", task1.Get(Tsk.Start).Equals(task2.Get(Tsk.Start)));
Console.WriteLine("Task1 Finish Equals Task2 Finish : {0} ", task1.Get(Tsk.Finish).Equals(task2.Get(Tsk.Finish)));

Project Calculation Mode - Automatic

// Create empty project and set calculation mode to Automatic
Project project = new Project();
project.CalculationMode = CalculationMode.Automatic;

// Set project start date and add new tasks
project.Set(Prj.StartDate, new DateTime(2015, 4, 15));
Task task1 = project.RootTask.Children.Add("Task 1");
Task task2 = project.RootTask.Children.Add("Task 2");

// Link tasks
TaskLink link = project.TaskLinks.Add(task1, task2, TaskLinkType.FinishToStart);

// Verify dates have been recalculated
Console.WriteLine("Task1 Start + 1 Equals Task2 Start : {0} ", task1.Get(Tsk.Start).AddDays(1).Equals(task2.Get(Tsk.Start)));
Console.WriteLine("Task1 Finish + 1 Equals Task2 Finish : {0} ", task1.Get(Tsk.Finish).AddDays(1).Equals(task2.Get(Tsk.Finish)));
Console.WriteLine("RootTask Finish Equals Task2 Finish : {0} ", task2.Get(Tsk.Finish).Equals(project.RootTask.Get(Tsk.Finish)));
Console.WriteLine("Project Finish Date Equals Task2 Finish : {0} ", task2.Get(Tsk.Finish).Equals(project.Get(Prj.FinishDate)));