DateValue

ExtendedAttribute.DateValue property

Gets or sets a value for attributes with date types (Date, Start, Finish).

public DateTime DateValue { get; set; }

Exceptions

exceptioncondition
InvalidOperationExceptionThrown if the AttributeDefinition property is not initialized or current attribute is not an date attribute.

Examples

Shows how to change attribute definition of the extended attribute.

var project = new Project();

// create new task extended attribute definition
var definition = ExtendedAttributeDefinition.CreateTaskDefinition(CustomFieldType.Cost, ExtendedAttributeTask.Cost1, string.Empty);

// add a formula to the attribute.
definition.Alias = "Difference between Cost and Actual Cost";
definition.Formula = "[Cost]-[Actual Cost]";

project.ExtendedAttributes.Add(definition);

var task = project.RootTask.Children.Add("Task");
task.Set(Tsk.Start, new DateTime(2020, 4, 21, 8, 0, 0));
task.Set(Tsk.Duration, project.GetDuration(1, TimeUnitType.Day));
task.Set(Tsk.Finish, new DateTime(2020, 4, 21, 17, 0, 0));
task.Set(Tsk.Deadline, new DateTime(2020, 4, 22, 17, 0, 0));
task.Set(Tsk.Cost, 20);
task.Set(Tsk.ActualCost, 13);

// create extended attribute
var extendedAttribute = definition.CreateExtendedAttribute();
task.ExtendedAttributes.Add(extendedAttribute);

Console.WriteLine("Before change:");
Console.WriteLine("Alias: " + definition.Alias);
Console.WriteLine("Field Id: " + extendedAttribute.FieldId);
Console.WriteLine("Value: " + extendedAttribute.NumericValue);

// create a new date extended attribute definition
var newDefinition = ExtendedAttributeDefinition.CreateTaskDefinition(CustomFieldType.Date, ExtendedAttributeTask.Date1, string.Empty);

// add a formula to the attribute.
newDefinition.Alias = "Days from finish to deadline";
newDefinition.Formula = "[Deadline] - [Finish]";
project.ExtendedAttributes.Add(newDefinition);

extendedAttribute = newDefinition.CreateExtendedAttribute();

Console.WriteLine();
Console.WriteLine("After change:");
Console.WriteLine("Alias: " + definition.Alias);
Console.WriteLine("Field Id: " + extendedAttribute.FieldId);
Console.WriteLine("Value: " + extendedAttribute.DateValue.Day);

See Also

AttributeDefinition DurationValue