IObjectSpace.CreateObject(Type) Method

Creates an object of the specified type.

Namespace: DevExpress.ExpressApp

Assembly: DevExpress.ExpressApp.v23.2.dll

NuGet Package: DevExpress.ExpressApp

Declaration

C#

object CreateObject(
    Type type
)

VB.NET

Function CreateObject(
    type As Type
) As Object

Parameters

Name	Type	Description
type	Type	A Type object which is the type of the object to be created.

Returns

Type	Description
Object	An object that represents the created object of the specified type.

Remarks

The following example uses a Parametrized Action to create a new Department object and refresh the Detail View. The new department becomes available in the Contact.Department Lookup List View.

C#

using DevExpress.ExpressApp;
using DevExpress.ExpressApp.Actions;
using DevExpress.Persistent.Base;
using MainDemo.Module.BusinessObjects;
// ...
public class AddDepartmentController : ObjectViewController<DetailView, Contact> {
    public AddDepartmentController() {
        ParametrizedAction addDepartmentAction = new ParametrizedAction(
            this, "AddDepartment", PredefinedCategory.Edit, typeof(string));
        addDepartmentAction.Execute += AddDepartmentAction_Execute;
    }
    private void AddDepartmentAction_Execute(object sender, ParametrizedActionExecuteEventArgs e) {
        using(IObjectSpace objectSpace = Application.CreateObjectSpace(typeof(Department))) {
            Department department = objectSpace.CreateObject<Department>();
            department.Title = e.ParameterCurrentValue as string;
            objectSpace.CommitChanges();
        }
        View.Refresh();
    }
}

VB.NET

Imports DevExpress.ExpressApp
Imports DevExpress.ExpressApp.Actions
Imports DevExpress.Persistent.Base
Imports MainDemo.Module.BusinessObjects

Public Class AddDepartmentController
    Inherits ObjectViewController(Of DetailView, Contact)
    Public Sub New()
        Dim addDepartmentAction As New ParametrizedAction( _
            Me, "AddDepartment", PredefinedCategory.Edit, GetType(String))
        AddHandler addDepartmentAction.Execute, AddressOf AddDepartmentAction_Execute
    End Sub
    Private Sub AddDepartmentAction_Execute(ByVal sender As Object, ByVal e As ParametrizedActionExecuteEventArgs)
        Using objectSpace As IObjectSpace = Application.CreateObjectSpace(GetType(Department))
            Dim department As Department = objectSpace.CreateObject(Of Department)()
            department.Title = TryCast(e.ParameterCurrentValue, String)
            objectSpace.CommitChanges()
        End Using
        View.Refresh()
    End Sub
End Class

If you implement the IObjectSpace interface in the BaseObjectSpace class’ descendant, you don’t have to override the CreateObject method entirely. The BaseObjectSpace.CreateObject method invokes a protected virtual BaseObjectSpace.CreateObjectCore method and then sets the returned object modified by calling the BaseObjectSpace.SetModified method for it. So, you should only override the CreateObjectCore method.

The created object will be saved to the database when calling the IObjectSpace.CommitChanges method.

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the CreateObject(Type) method.

Note

The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.

C#

xaf-how-to-implement-a-custom-security-operation-that-can-be-permitted-at-the-type-level/CS/CustomSecurityOperation.Module/Controllers/RemoveBaseTypePermissionNewActionItemController.cs#L18

if(e.ObjectType == typeof(PermissionPolicyTypePermissionObject)) {
    e.NewObject = e.ObjectSpace.CreateObject(typeof(CustomTypePermissionObject));
}

XAF_Non-Persistent-Objects-Edit-Linked-Persistent-Objects-Demo/CS/NonPersistentObjectsDemo.Module/Controllers/NonPersistentObjectActivatorController.cs#L39

var objectSpace = Application.CreateObjectSpace(objectType);
var obj = objectSpace.CreateObject(objectType);
objectSpace.RemoveFromModifiedObjects(obj);

xaf-web-forms-use-oauth2-authentication-providers/CS/MySolution.Web/Security/OAuthProvider.cs#L31

if (user == null && CreateUserAutomatically) {
    user = (ApplicationUser)objectSpace.CreateObject(userType);
    user.UserName = userEmail;

VB.NET

xaf-how-to-implement-a-custom-security-operation-that-can-be-permitted-at-the-type-level/VB/CustomSecurityOperation.Module/Controllers/RemoveBaseTypePermissionNewActionItemController.vb#L19

If e.ObjectType = GetType(PermissionPolicyTypePermissionObject) Then
    e.NewObject = e.ObjectSpace.CreateObject(GetType(CustomTypePermissionObject))
End If

XAF_Non-Persistent-Objects-Edit-Linked-Persistent-Objects-Demo/VB/NonPersistentObjectsDemo.Module/Controllers/NonPersistentObjectActivatorController.vb#L41

Dim objectSpace = Application.CreateObjectSpace(objectType)
Dim obj = objectSpace.CreateObject(objectType)
objectSpace.RemoveFromModifiedObjects(obj)

xaf-web-forms-use-oauth2-authentication-providers/VB/MySolution.Web/Security/OAuthProvider.vb#L33

If user Is Nothing AndAlso CreateUserAutomatically Then
    user = DirectCast(objectSpace.CreateObject(userType), ApplicationUser)
    user.UserName = userEmail