using MPXJ.Net;

var project = new UniversalProjectReader().Read("example.mpp");
new UniversalProjectWriter(FileFormat.MPX).Write(project, "example.mpx");

using MPXJ.Net;

var project = new UniversalProjectReader().Read("example.mpp");

System.Console.WriteLine("Tasks");
foreach (var task in project.Tasks)
{
    System.Console.WriteLine($"{task.ID}\t{task.Name}");
}   

using MPXJ.Net;

// In the example below we'll be generating an MSPDI
// file which we can import into Microsoft Project.
var filename = "example.xml";
var fileformat = FileFormat.MSPDI;

// Create a ProjectFile instance
var file = new ProjectFile();

// Add a default calendar called "Standard"
var calendar = file.AddDefaultBaseCalendar();

// Add a holiday to the calendar to demonstrate calendar exceptions
calendar.AddCalendarException(DateOnly.Parse("2006-03-13"), DateOnly.Parse("2006-03-13"));

// Retrieve the project properties and set the start date. Note Microsoft
// Project appears to reset all task dates relative to this date, so this
// date must match the start date of the earliest task for you to see
// the expected results. If this value is not set, it will default to
// today's date.
var properties = file.ProjectProperties;
properties.StartDate = DateTime.Parse("2003-01-01 08:00");

// Set a couple more properties just for fun
properties.ProjectTitle = "Created by MPXJ";
properties.Author = "Jon Iles";

// Let's create an alias for TEXT1
var customFields = file.CustomFields;
var field = customFields.GetOrCreate(TaskField.Text1);
field.Alias = "My Custom Field";

// Add resources
var resource1 = file.AddResource();
resource1.Name = "Resource1";

var resource2 = file.AddResource();
resource2.Name = "Resource2";
resource2.Availability.Add(new Availability(DateTimeHelper.StartDateNA, DateTimeHelper.EndDateNA, 50));

// Create a summary task
var task1 = file.AddTask();
task1.Name = "Summary Task";

// Create the first sub task
var task2 = task1.AddTask();
task2.Name = "First Sub Task";
task2.Duration = Duration.GetInstance(10.5, TimeUnit.Days);
task2.Start = DateTime.Parse("2003-01-01 08:00");
task2.SetText(1, "My Custom Value 1");

// We'll set this task up as being 50% complete. If we have no resource
// assignments for this task, this is enough information for MS Project.
// If we do have resource assignments, the assignment record needs to
// contain the corresponding work and actual work fields set to the
// correct values in order for MS project to mark the task as complete
// or partially complete.
task2.PercentageComplete = 50.0;
task2.ActualStart = DateTime.Parse("2003-01-01 08:00");

// Create the second sub task
var task3 = task1.AddTask();
task3.Name = "Second Sub Task";
task3.Start = DateTime.Parse("2003-01-11 08:00");
task3.Duration = Duration.GetInstance(10, TimeUnit.Days);
task3.SetText(1, "My Custom Value 2");

// Link these two tasks
task3.AddPredecessor(new Relation.Builder(file).TargetTask(task2).Type(RelationType.FinishStart));

// Add a milestone
var milestone1 = task1.AddTask();
milestone1.Name = "Milestone";
milestone1.Start = DateTime.Parse("2003-01-21 08:00");
milestone1.Duration = Duration.GetInstance(0, TimeUnit.Days);
milestone1.AddPredecessor(new Relation.Builder(file).TargetTask(task3).Type(RelationType.FinishStart));

// This final task has a percent complete value, but no
// resource assignments. This is an interesting case it it requires
// special processing to generate the MSPDI file correctly.
var task4 = file.AddTask();
task4.Name = "Next Task";
task4.Duration = Duration.GetInstance(8, TimeUnit.Days);
task4.Start= DateTime.Parse("2003-01-01 08:00");
task4.PercentageComplete = 70;
task4.ActualStart = DateTime.Parse("2003-01-01 08:00");

// Assign resources to tasks
var assignment1 = task2.AddResourceAssignment(resource1);
var assignment2 = task3.AddResourceAssignment(resource2);

// As the first task is partially complete, and we are adding
// a resource assignment, we must set the work and actual work
// fields in the assignment to appropriate values, or MS Project
// won't recognise the task as being complete or partially complete
assignment1.Work = Duration.GetInstance(80, TimeUnit.Hours);
assignment1.ActualWork = Duration.GetInstance(40, TimeUnit.Hours);

// If we were just generating an MPX file, we would already have enough
// attributes set to create the file correctly. If we want to generate
// an MSPDI file, we must also set the assignment start dates and
// the remaining work attribute. The assignment start dates will normally
// be the same as the task start dates.
assignment1.RemainingWork = Duration.GetInstance(40, TimeUnit.Hours);
assignment2.RemainingWork = Duration.GetInstance(80, TimeUnit.Hours);
assignment1.Start = DateTime.Parse("2003-01-01 08:00");
assignment2.Start = DateTime.Parse("2003-01-11 08:00");

// Write a 100% complete task
var task5 = file.AddTask();
task5.Name = "Last Task";
task5.Duration = Duration.GetInstance(3, TimeUnit.Days);
task5.Start = DateTime.Parse("2003-01-01 08:00");
task5.PercentageComplete = 100;
task5.ActualStart = DateTime.Parse("2003-01-01 08:00");

// Write a 100% complete milestone
var task6 = file.AddTask();
task6.Name = "Last Milestone";
task6.Duration = Duration.GetInstance(0, TimeUnit.Days);
task6.Start = DateTime.Parse("2003-01-01 08:00");
task6.PercentageComplete = 100.0;
task6.ActualStart = DateTime.Parse("2003-01-01 08:00");

// Write the file
new UniversalProjectWriter(fileformat).Write(file, filename);