IObjectSpace.Delete(IList) Method

Deletes the specified persistent objects and their aggregated objects from the database.

Namespace: DevExpress.ExpressApp

Assembly: DevExpress.ExpressApp.v23.2.dll

NuGet Package: DevExpress.ExpressApp

Declaration

C#

void Delete(
    IList objects
)

VB.NET

Sub Delete(
    objects As IList
)

Parameters

Name	Type	Description
objects	IList	A collection of persistent objects to be deleted from the database.

Remarks

Use this method to delete the objects passed as the parameter from the database. Note, that the objects are not deleted immediately. They are only marked as objects to be deleted during the next call of the IObjectSpace.CommitChanges method.

In the BaseObjectSpace descendant, the Delete method is implemented. In this method, the IObjectSpace.CustomDeleteObjects event is raised, a protected virtual BaseObjectSpace.DeleteCore method is invoked and then the current Object Space is set as modified. So, you should only override the BaseObjectSpace.DeleteCore method, to delete the specified objects using the container for in-memory objects (for example, XPObjectSpace.Session in the case of an XPObjectSpace or EFCoreObjectSpace.DbContext in the case of an EFCoreObjectSpace).

After this method call, the Object Space’s IObjectSpace.IsModified property is set to true.

Use the following code in a controller to delete all objects from the List View collection:

C#

using DevExpress.ExpressApp;
using DevExpress.ExpressApp.Actions;

public class MyViewController : ObjectViewController<ListView, MyClass> {
    public MyViewController() {
        var action = new SimpleAction(this, "Delete all objects", DevExpress.Persistent.Base.PredefinedCategory.Edit);
        action.Execute += Action_Execute;
    }

    private void Action_Execute(object sender, SimpleActionExecuteEventArgs e) {
        this.ObjectSpace.Delete(View.CollectionSource.List);
        this.ObjectSpace.CommitChanges();
    }
} 

VB.NET

Imports DevExpress.ExpressApp
Imports DevExpress.ExpressApp.Actions

Public Class MyViewController
    Inherits ObjectViewController(Of ListView, [MyClass])
    Public Sub New()
        Dim action = New SimpleAction(Me, "Delete all objects", DevExpress.Persistent.Base.PredefinedCategory.Edit)
        AddHandler action.Execute, AddressOf Action_Execute
    End Sub
    Private Sub Action_Execute(ByVal sender As Object, ByVal e As SimpleActionExecuteEventArgs)
        Me.ObjectSpace.Delete(View.CollectionSource.List)
        Me.ObjectSpace.CommitChanges()
    End Sub
End Class