NonPersistentObjectSpace.IsNewObject(Object) Method

Indicates whether a specified object has been created but has not been saved to the database.

Namespace: DevExpress.ExpressApp

Assembly: DevExpress.ExpressApp.v24.1.dll

NuGet Package: DevExpress.ExpressApp

Declaration

C#

public override bool IsNewObject(
    object obj
)

VB.NET

Public Overrides Function IsNewObject(
    obj As Object
) As Boolean

Parameters

Name	Type	Description
obj	Object	A object to be tested.

Returns

Type	Description
Boolean	true if the specified object has not yet been saved to the database; otherwise, false.

Remarks

The objects that are created both directly via the IObjectSpace.CreateObject method and by means of built-in Actions (e.g. the New Action) are not saved to the database immediately. They are saved only when the IObjectSpace.CommitChanges method is called, directly or by means of built-in Actions (e.g. the Save Action). Until an object created within the current Object Space is not saved to the database, the IsNewObject method returns true. After saving, the IsNewObject method returns false. It is presumed that this property must return false if the object passed as the parameter is not persistent, or if it does not belong to the current Object Space.

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the IsNewObject(Object) 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-CRUD-Operations-for-Non-Persistent-Objects-Stored-Remotely/CS/NonPersistentObjectsDemo.Module/TransientNonPersistentObjectAdapter.cs#L44

foreach(var obj in toSave) {
    if(objectSpace.IsNewObject(obj)) {
        toInsert.Add(obj);

XAF_Non-Persistent-Objects-Nested-In-Persistent-Objects-Demo/CS/NonPersistentObjectsDemo.Module/BusinessObjects/CollectionStoredSeparately/Technology.cs#L60

}
else if(ObjectSpace.IsNewObject(obj)) {
    objData = new Technology(obj.Oid);

VB.NET

XAF-How-to-Implement-CRUD-Operations-for-Non-Persistent-Objects-Stored-Remotely/VB/NonPersistentObjectsDemo.Module/TransientNonPersistentObjectAdapter.vb#L43

For Each obj In toSave
    If objectSpace.IsNewObject(obj) Then
        toInsert.Add(obj)

XAF_Non-Persistent-Objects-Nested-In-Persistent-Objects-Demo/VB/NonPersistentObjectsDemo.Module/BusinessObjects/CollectionStoredSeparately/Technology.vb#L78

    storage.Remove(obj.Oid)
ElseIf ObjectSpace.IsNewObject(obj) Then
    objData = New Technology(obj.Oid)