GanttValidationSettings Class

Accesses validation settings.

Namespace: DevExpress.Web.ASPxGantt

Assembly: DevExpress.Web.ASPxGantt.v20.1.dll

NuGet Package: DevExpress.Web

Declaration

C#

public class GanttValidationSettings :
    GanttSettingsBase

VB.NET

Public Class GanttValidationSettings
    Inherits GanttSettingsBase

Related API Members

The following members return GanttValidationSettings objects:

• ASPxGantt.SettingsValidation
• GanttSettings.SettingsValidation

Remarks

The ASPxGantt allows you to validate relationships between tasks when they are edited.

Dependency Rules Validation

Set the EnableDependencyValidation property to true to enable dependency rules validation.

ASPX

<dx:ASPxGantt ID="Gantt" >
    ...
    <SettingsValidation EnableDependencyValidation="true" />
</dx:ASPxGantt>

The Gantt supports the following dependency types:

Dependency Type	Dependency Rule
Finish to Start (FS)	A successor task’s start point should equal a predecessor task’s endpoint.
Start to Start (SS)	A successor and predecessor tasks should start at the same time.
Finish to Finish (FF)	A successor and predecessor tasks should end at the same time.
Start to Finish (SF)	A successor task’s end point should equal a predecessor task’s start point.

The table below illustrates how the Gantt control handles user actions that violate dependency rules.

User Action	Dependency Type	Gantt’s Reaction
Move a predecessor task (Task 1) to the left or right.	Finish to Start (FS): Start to Start (SS): Start to Finish (SF): Finish to Finish (FF):	The control moves a successor task (Task 2) forward or backward to the same time interval.
Move a successor task (Task 2) to the left.	Finish to Start (FS): Start to Start (SS): Start to Finish (SF): Finish to Finish (FF):	This change is denied as it violates dependency rules. The control displays a popup window and suggests the following actions: Decline the change. Remove the dependency.
Move a successor task (Task 2) to the right.	Finish to Start (FS): Start to Start (SS): Start to Finish (SF): Finish to Finish (FF):	The control displays a popup window and suggests the following actions: Decline the change. Remove the dependency. Apply the change. It creates a gap between tasks. Note that you can move tasks forward and backward within this gap while it meets the dependency rules.

Parent-Child Relationship Validation

Set the AutoUpdateParentTasks property to true to enable validation for parent&child relationships.

ASPX

<dx:ASPxGantt ID="Gantt" >
    ...
    <SettingsValidation AutoUpdateParentTasks="true" />
</dx:ASPxGantt>

The Gantt control supports the following rules for parent&child relationships validation:

• A parent task’s duration equals a summary duration of its child tasks.
• A parent task and its first child starts at the same time.
• A parent task and its last child ends at the same time.
• A parent task’s progress is a summary progress of its child tasks.

Online Demos

• ASPxGantt - Validation

• MVC Gantt - Validation

Implements

IStateManager

Inheritance

Object

StateManager

PropertiesBase

GanttSettingsBase

GanttValidationSettings