IObjectSpace.GetObjectsCount(Type, CriteriaOperator) Method

Returns the number of objects specified.

Namespace: DevExpress.ExpressApp

Assembly: DevExpress.ExpressApp.v18.2.dll

Declaration

C#

int GetObjectsCount(
    Type objectType,
    CriteriaOperator criteria
)

VB.NET

Function GetObjectsCount(
    objectType As Type,
    criteria As CriteriaOperator
) As Integer

Parameters

Name	Type	Description
objectType	Type	A Type object that identifies the type of objects against which the calculation will be performed.
criteria	CriteriaOperator	The CriteriaOperator that specifies the criteria for object selection in the database.

Returns

Type	Description
Int32	An integer value that is the count of persistent objects that satisfy the specified criteria.

Remarks

This method is intended to calculate the number of persistent objects in the database. For instance, this method is used before retrieving objects for the Lookup Property Editor. If there are more than the specified value, the Find editor is available.

Related GitHub Examples

The following code snippets (auto-collected from DevExpress Examples) contain references to the GetObjectsCount(Type, CriteriaOperator) 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-display-a-non-persistent-objects-detail-view-from-the-navigation-e4447/CS/NonPersistentDetailViewNavigationExample.Module/Module.cs#L32

issueStatistics.ActiveIssuesCount =
    objectSpace.GetObjectsCount(typeof(Issue),
    CriteriaOperator.Parse("[Status] == 'Active'"));

XAF_how-to-show-an-xtrareport-created-at-design-time-without-the-use-of-xaf-reports-module-e4752/CS/NativeXtraReportExample.Module/DatabaseUpdate/Updater.cs#L20

base.UpdateDatabaseAfterUpdateSchema();
if (ObjectSpace.GetObjectsCount(typeof(Task), null) == 0) {
    for (int i = 1; i <= 100; i++) {

XAF_how-to-implement-a-singleton-class-e237/CS/HowToImplementSingleton.Module/Updater.cs#L16

//Create the Singleton object
if (ObjectSpace.GetObjectsCount(typeof(Singleton), null) == 0) {
    Singleton singleton = ObjectSpace.CreateObject<Singleton>();

XAF_how-to-limit-the-amount-of-objects-created-via-the-new-action-e239/CS/HowToLimitAmountOfObjectsCreatedViaNewAction.Module/LimitTaskAmountController.cs#L26

if ((e.ObjectType == typeof(Task)) &&
    (e.ObjectSpace.GetObjectsCount(typeof(Task), null) >= 3)) {
     e.Cancel = true;

XAF_how-to-display-the-dxchart-widget-in-an-xaf-view-t381904/CS/DxSample.Module/DatabaseUpdate/Updater.cs#L20

private void CreateObjects<TEntity>(string resourceName, Action<TEntity, string[]> updateEntity) {
    int objectsCnt = this.ObjectSpace.GetObjectsCount(typeof(TEntity), null);
    if(objectsCnt > 0) return;

VB.NET

XAF_how-to-display-a-non-persistent-objects-detail-view-from-the-navigation-e4447/VB/NonPersistentDetailViewNavigationExample.Module/Module.vb#L33

Using objectSpace As IObjectSpace = Application.CreateObjectSpace(GetType(Issue))
    issueStatistics.ActiveIssuesCount = objectSpace.GetObjectsCount(GetType(Issue), CriteriaOperator.Parse("[Status] == 'Active'"))
    issueStatistics.ClosedIssuesCount = objectSpace.GetObjectsCount(GetType(Issue), CriteriaOperator.Parse("[Status] == 'Closed'"))

XAF_how-to-show-an-xtrareport-created-at-design-time-without-the-use-of-xaf-reports-module-e4752/VB/NativeXtraReportExample.Module/DatabaseUpdate/Updater.vb#L22

MyBase.UpdateDatabaseAfterUpdateSchema()
If ObjectSpace.GetObjectsCount(GetType(Task), Nothing) = 0 Then
    For i As Integer = 1 To 100

XAF_how-to-implement-a-singleton-class-e237/VB/HowToImplementSingleton.Module/Updater.vb#L20

'Create the Singleton object
If ObjectSpace.GetObjectsCount(GetType(Singleton), Nothing) = 0 Then
    Dim _singleton As Singleton = ObjectSpace.CreateObject(Of Singleton)()

XAF_how-to-limit-the-amount-of-objects-created-via-the-new-action-e239/VB/HowToLimitAmountOfObjectsCreatedViaNewAction.Module/LimitTaskAmountController.vb#L27

Private Sub controller_ObjectCreating(ByVal sender As Object, ByVal e As ObjectCreatingEventArgs)
    If (e.ObjectType Is GetType(Task)) AndAlso (e.ObjectSpace.GetObjectsCount(GetType(Task), Nothing) >= 3) Then
         e.Cancel = True

XAF_how-to-display-the-dxchart-widget-in-an-xaf-view-t381904/VB/DxSample.Module/DatabaseUpdate/Updater.vb#L22

Private Sub CreateObjects(Of TEntity)(ByVal resourceName As String, ByVal updateEntity As Action(Of TEntity, String()))
    Dim objectsCnt As Integer = Me.ObjectSpace.GetObjectsCount(GetType(TEntity), Nothing)
    If objectsCnt > 0 Then