CompositeView.ObjectSpace Property

Provides access to the Object Space within which a View was created.

Namespace: DevExpress.ExpressApp

Assembly: DevExpress.ExpressApp.v24.2.dll

NuGet Package: DevExpress.ExpressApp

Declaration

C#

public override IObjectSpace ObjectSpace { get; }

VB.NET

Public Overrides ReadOnly Property ObjectSpace As IObjectSpace

Property Value

Type	Description
IObjectSpace	An IObjectSpace object representing the current View’s Object Space.

Remarks

An Object Space (see BaseObjectSpace) represents an instrument that allows managing a cache with persistent objects that are currently used in a View. Via an Object Space, a particular objects set is retrieved from the database to a data set. This allows making changes to objects within this data set, and canceling changes. This does not influence the general database. Use this property to access the current View’s Object Space.

Note

Do not use a root View’s Object Space for the creation of another root View in it. Instead, create a new Object Space via the XafApplication.CreateObjectSpace method for the new root View.

Note

The ObjectSpace property is not supposed to be used in scenarios where a large amount of data is processed, created or deleted. Instead, use an independent Object Space which is not used by a View. Such an Object Space can be instantiated via the XafApplication.CreateObjectSpace method.

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the ObjectSpace property.

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-separate-employees-data-in-different-departments-using-security-permissions/CS/MainDemo.Module/Controllers/HideProtectedContentController.cs#L26

((ColumnWrapper)e.Item).PropertyName, null,
((ListView)View).CollectionSource, View.ObjectSpace)) {
e.AppearanceObject.Visibility = ViewItemVisibility.Hide;

XAF_how-to-show-filter-dialog-before-listview/CS/E1554.Module/ShowFilterDialogController.cs#L57

((IModelListViewAdditionalCriteria)targetView.Model).AdditionalCriteria = currentViewFilterContainer.Criteria;
targetView.CollectionSource.Criteria["ByViewFilterObject"] = CriteriaEditorHelper.GetCriteriaOperator(currentViewFilterContainer.Criteria, currentViewFilterContainer.ObjectType, targetView.ObjectSpace);
oldListView = null;

VB.NET

xaf-separate-employees-data-in-different-departments-using-security-permissions/VB/MainDemo.Module/Controllers/HideProtectedContentController.vb#L33

If Not DataManipulationRight.CanRead(View.ObjectTypeInfo.Type, (CType(e.Item, ColumnWrapper)).PropertyName, Nothing, (CType(View, ListView)).CollectionSource, View.ObjectSpace) Then
    e.AppearanceObject.Visibility = ViewItemVisibility.Hide

XAF_how-to-show-filter-dialog-before-listview/VB/E1554.Module/ShowFilterDialogController.vb#L58

DirectCast(targetView.Model, IModelListViewAdditionalCriteria).AdditionalCriteria = currentViewFilterContainer.Criteria
targetView.CollectionSource.Criteria("ByViewFilterObject") = CriteriaEditorHelper.GetCriteriaOperator(currentViewFilterContainer.Criteria, currentViewFilterContainer.ObjectType, targetView.ObjectSpace)
oldListView = Nothing