How to edit an object in the DetailView opened by a row click from a nested ListView (CollectionsEditMode = ViewEditMode.Edit)

Currently, you can consider one of the following solutions to always open an editable child DetailView in the same main window after clicking on a nested ListView record inside an editable parent DetailView as opposed to the default popup opening with a read-only view. To see the difference between these solutions and the default Web UI behavior, use our MainDemo.Web app, edit a contact in DetailView and then try to open its existing tasks by clicking on them.

1. Implement a custom ViewController that will intercept the default behavior of the https://documentation.devexpress.com/#eXpressAppFramework/clsDevExpressExpressAppSystemModuleListViewProcessCurrentObjectControllertopic class and always make the opened DetailView editable. Consider the following pseudo code (tested with our MainDemo.Web app):

C#
using DevExpress.ExpressApp;  
using MainDemo.Module.BusinessObjects;  
using DevExpress.ExpressApp.SystemModule;  

namespace MainDemo.Module.Web {  
    public class Class2: ObjectViewController<ListView, DemoTask> {  
        public Class2() {  
            TargetViewId = "Contact_Tasks_ListView";  
        }  
        protected override void OnActivated() {  
            base.OnActivated();  
            DetailView parentDetailView = (DetailView)((NestedFrame)Frame).ViewItem.View;  
            if(parentDetailView.ViewEditMode == DevExpress.ExpressApp.Editors.ViewEditMode.Edit) {  
                ListViewProcessCurrentObjectController controller = Frame.GetController<ListViewProcessCurrentObjectController>();  
                if(controller != null) {  
                    controller.CustomizeShowViewParameters += Class2_CustomizeShowViewParameters;  
                }  
            }  
        }  
        void Class2_CustomizeShowViewParameters(object sender, CustomizeShowViewParametersEventArgs e) {  
            ((DetailView)e.ShowViewParameters.CreatedView).ViewEditMode = DevExpress.ExpressApp.Editors.ViewEditMode.Edit;  
        }  
    }  
}  

You can learn more on this implementation from the Concepts > Extend Functionality > Customize Controllers and Actions and eXpressApp Framework > Concepts > Extend Functionality > Built-in Controllers and Actions  help articles.

2. Implement a custom ShowViewStrategy with the overridden ShowViewFromNestedView  method that will globally change the default behavior for showing views from a nested Frame. Consider the code below, which can be added into the YourSolutionName.Web/Global.asax.cs file:

C#
using System;  
using System.Web;  
using DevExpress.Web;  
using DevExpress.ExpressApp;  
using DevExpress.ExpressApp.Xpo;  
using DevExpress.ExpressApp.Web;  
using DevExpress.Persistent.Base;  
using System.Collections.Generic;  
using DevExpress.ExpressApp.Editors;  

namespace MainDemo.Web {  
    public class MyShowViewStrategy_B151776 : ShowViewStrategy {  
        public MyShowViewStrategy_B151776(XafApplication application) : base(application) { }  
        protected override void ShowViewFromNestedView(ShowViewParameters parameters, ShowViewSource showViewSource) {  
            NestedFrame nestedFrame = showViewSource.SourceFrame as NestedFrame;  
            bool isParentDetailViewEditable = (nestedFrame != null) && (nestedFrame.ViewItem != null) && (nestedFrame.ViewItem.View is DetailView) && (((DetailView)nestedFrame.ViewItem.View).ViewEditMode == ViewEditMode.Edit);  
            bool isDetailViewToBeShown = parameters.CreatedView is DetailView;  
            bool isDetailViewShownFromListViewAction = showViewSource.SourceAction != null && showViewSource.SourceAction.Id == DevExpress.ExpressApp.SystemModule.ListViewProcessCurrentObjectController.ListViewShowObjectActionId;  
            if(isDetailViewToBeShown && isParentDetailViewEditable && isDetailViewShownFromListViewAction) {  
                ((DetailView)parameters.CreatedView).ViewEditMode = ViewEditMode.Edit;  
                Application.MainWindow.SetView(parameters.CreatedView, showViewSource.SourceFrame);  
            }  
            else {  
                base.ShowViewFromNestedView(parameters, showViewSource);  
            }  
        }  
    }  
    public class Global : System.Web.HttpApplication {  
...  
        protected void Session_Start(object sender, EventArgs e) {  
            Tracing.Initialize();  
            WebApplication.SetInstance(Session, new MainDemoWebApplication());  
            WebApplication.Instance.ShowViewStrategy = new MyShowViewStrategy_B151776(WebApplication.Instance);  
...  

You can learn more on this implementation from the XafApplication > ShowViewStrategy and DevExpress.ExpressApp > ShowViewStrategyBase help articles.

NOTE: these are not complete and generic solutions that apply to each and every standard XAF scenario, and you will likely need to modify and test them further according to your own business needs or situations.