The View.SelectedObjects property returns a collection of disposed objects in certain circumstances

In the meantime, you can use the following workaround:

C#
public class MyController : ViewController<ListView> {  
    protected override void OnActivated() {  
        base.OnActivated();  
        ObjectSpace.Reloaded += ObjectSpace_Reloaded;  
    }  
    void ObjectSpace_Reloaded(object sender, EventArgs e) {  
        FieldInfo fi = typeof(DevExpress.ExpressApp.Web.Editors.ComplexWebListEditor).GetField("isSelectedObjectsCacheActual", BindingFlags.Instance | BindingFlags.NonPublic);  
        if(fi != null) {  
            fi.SetValue(View.Editor, false);  
        }  
    }  
}  

See the attached projects for more details.
- Solution61:

C#
public class TestSelectedObjectsController : ViewController<ListView> {  
    protected override void OnActivated() {  
        base.OnActivated();  
        View.Editor.ControlsCreated += Editor_ControlsCreated;  
    }  

    void Editor_ControlsCreated(object sender, EventArgs e) {  
        ((ASPxGridView)View.Editor.Control).HtmlRowPrepared += TestSelectedObjectsController_HtmlRowPrepared;  
    }  

    void TestSelectedObjectsController_HtmlRowPrepared(object sender, ASPxGridViewTableRowEventArgs e) {  
        if(View.SelectedObjects.Count > 0) {  
        Session session = ((Object1)View.SelectedObjects[0]).Session; <- error occurred  
            }  
    }  
}  

- Solution72:

C#
    [DefaultClassOptions]  
    public class Class1 : BaseObject {  
        public Class1(Session session) : base(session) { }  
        public string Name {  
            get {  
                if(IsSaving) { <- error occurred  
                    return GetPropertyValue<string>("Name");  
                }  
                return GetPropertyValue<string>("Name");  
            }  
            set {  
                SetPropertyValue<string>("Name", value);  
            }  
        }  
    }  
    public class MyController : ViewController {  
        public MyController() {  
            SimpleAction action = new SimpleAction(this, "Print", PredefinedCategory.Export);  
            action.SelectionDependencyType = SelectionDependencyType.RequireSingleObject;  
            action.ConfirmationMessage = "Are you sure?";  
        }  
    }  

The error occurred:  


 Type:       ObjectDisposedException  
 Message:    Cannot access a disposed object.  
Object name: 'Solution72.Module.BusinessObjects.Class1(3899f9f8-3443-4f0f-9151-0b553f6d4aff)'.  
 Data:       0 entries  
 Stack trace:  


   at DevExpress.Xpo.PersistentBase.get_Session()  
   at DevExpress.Xpo.PersistentBase.get_IsSaving()  
   at Solution72.Module.BusinessObjects.Class1.get_Name() in c:\Projects\Solution72\Solution72.Module\BusinessObjects\Class1.cs:line 18  
   at lambda_method(Closure , Object )  
   at DevExpress.Xpo.Metadata.ReflectionMemberInfo.DelegateFieldAccessor.GetValue(Object theObject)  
   at DevExpress.Xpo.Metadata.ReflectionMemberInfo.GetValue(Object theObject)  
   at DevExpress.ExpressApp.DC.Xpo.XpoTypeInfoSource.GetValue(IMemberInfo memberInfo, Object obj)  
   at DevExpress.ExpressApp.DC.XafMemberInfo.GetValue(Object obj)  
   at DevExpress.Persistent.Base.ReflectionHelper.GetObjectDisplayText(Object obj)  
   at DevExpress.ExpressApp.Actions.ActionBase.GetFormattedConfirmationMessage()  
   at DevExpress.ExpressApp.Templates.ActionBaseItem.SynchronizeWithActionCore()  
   at DevExpress.ExpressApp.Web.Templates.ActionContainers.Menu.MenuActionItemBase..ctor(ActionBase action)  
   at DevExpress.ExpressApp.Web.Templates.ActionContainers.ActionContainerHolder.CreateSimpleActionItem(SimpleAction simpleAction)  
   at DevExpress.ExpressApp.Web.Templates.ActionContainers.ActionContainerHolder.CreateActionItem(ActionBase action)  
   at DevExpress.ExpressApp.Web.Templates.ActionContainers.ActionContainerHolder.AddActionItem(MenuItemCollection targetItemCollection, ActionBase action, Boolean isFirstItem)  
   at DevExpress.ExpressApp.Web.Templates.ActionContainers.ActionContainerHolder.RegisterContainerActions(WebActionContainer container)  
   at DevExpress.ExpressApp.Web.Templates.ActionContainers.ActionContainerHolder.CreateMenuItems()  
   at DevExpress.ExpressApp.Web.Templates.ActionContainers.ActionContainerHolder.CreateChildControls()  
   at System.Web.UI.Control.EnsureChildControls()  
   at DevExpress.ExpressApp.Web.Templates.ActionContainers.ActionContainerHolder.ExecuteMenuItem(IList`1 items, String indexPath)  
   at DevExpress.ExpressApp.Web.Templates.ActionContainers.ActionContainerHolder.DevExpress.ExpressApp.Web.Templates.IXafCallbackHandler.ProcessAction(String parameter)  
   at DevExpress.ExpressApp.Web.Templates.XafCallbackManager.ProcessAction(String parameter)  
   at DevExpress.ExpressApp.Web.Templates.XafCallbackManager.callbackControl_Callback(Object source, CallbackEventArgs e)  
   at DevExpress.Web.ASPxCallback.OnCallback(CallbackEventArgs e)  
   at DevExpress.Web.ASPxCallback.RaiseCallbackEvent(String eventArgument)  
   at DevExpress.Web.ASPxWebControl.System.Web.UI.ICallbackEventHandler.RaiseCallbackEvent(String eventArgument)  
 InnerException is null