ObjectViewController<ViewType, ObjectType> Class

A base class for View Controllers intended for Object Views.

Assembly: DevExpress.ExpressApp.v25.2.dll

NuGet Package: DevExpress.ExpressApp

Declaration

C#
VB.NET

public abstract class ObjectViewController<ViewType, ObjectType> :
    ViewController<ViewType>
    where ViewType : ObjectView

Public MustInherit Class ObjectViewController(Of ViewType As ObjectView, ObjectType)
    Inherits ViewController(Of ViewType)

Type Parameters

Name	Description
ViewType	Specifies the ViewController.TargetViewType value.
ObjectType	Specifies the ViewController.TargetObjectType value

Remarks

This Controller inherist from the ObjectViewController and introduces two generic type parameters:

Parameter	Description
`ViewType`	Specifies the ViewController.TargetViewType value.
`ObjectType`	Specifies the ViewController.TargetObjectType value.

Use this class as the base class for a custom Controller to ensure that the custom Controller is activated for a specific View type and Object type.

The following code snippet demonstrates a custom View Controller derived from the generic ObjectViewController.

using DevExpress.Blazor;
using DevExpress.ExpressApp;
using DevExpress.ExpressApp.Blazor.Editors;
using MainDemo.Module.BusinessObjects;

namespace MainDemo.Blazor.Server.Controllers;

public sealed class ContactListViewController : ObjectViewController<ListView, Contact> {
    protected override void OnViewControlsCreated() {
        base.OnViewControlsCreated();
        if(View.Editor is DxGridListEditor gridListEditor) {
            // ...
        }
    }
}

Note

CodeRush allows you to add Actions and Controllers with a few keystrokes. To learn about the Code Templates for XAF, refer to the following help topic: XAF Templates.

Visual Studio designer cannot be used with generic components, so you cannot use it to design generic Controllers. As a possible workaround, you can declare an intermediate non-generic base class, derived from a generic Controller and decorated with the DesignerCategoryAttribute, and then derive your custom Controller from this intermediate class. The following code snippet illustrates this.

using System.ComponentModel;
using DevExpress.Blazor;
using DevExpress.ExpressApp;
using DevExpress.ExpressApp.Blazor.Editors;
using MainDemo.Module.BusinessObjects;

namespace MainDemo.Blazor.Server.Controllers;

public abstract class MyIntermediateListViewController : ObjectViewController<ListView, Contact> {
    // ...
}

public sealed class MyViewController : MyIntermediateListViewController {
    // ...
}