The requested page is not available for the requested platform. You are viewing the content for .NET Framework 4.5.2+ platform.
.NET Framework 4.5.2+
.NET Framework 4.5.2+
.NET Standard 2.0+
.NET Core 3.0+

IObjectSpace.GetObjects<T>(CriteriaOperator, Boolean) Method

Returns an IList collection of objects via the current Object Space.

Namespace: DevExpress.ExpressApp

Assembly: DevExpress.ExpressApp.v19.2.dll

Declaration

IList<T> GetObjects<T>(
    CriteriaOperator criteria,
    bool inTransaction
)
Function GetObjects(Of T)(
    criteria As CriteriaOperator,
    inTransaction As Boolean
) As IList(Of T)
IList<T> GetObjects<T>(
    CriteriaOperator criteria,
    bool inTransaction
)
Function GetObjects(Of T)(
    criteria As CriteriaOperator,
    inTransaction As Boolean
) As IList(Of T)
IList<T> GetObjects<T>(
    CriteriaOperator criteria,
    bool inTransaction
)
Function GetObjects(Of T)(
    criteria As CriteriaOperator,
    inTransaction As Boolean
) As IList(Of T)

Parameters

Name Type Description
criteria CriteriaOperator

A CriteriaOperator which specifies the criteria for object selection.

inTransaction Boolean

true, if the filter takes unsaved changes into account; otherwise, false. Has effect in XPO only.

Parameters

Name Type Description
criteria CriteriaOperator

A CriteriaOperator which specifies the criteria for object selection.

inTransaction Boolean

true, if the filter takes unsaved changes into account; otherwise, false. Has effect in XPO only.

Parameters

Name Type Description
criteria CriteriaOperator

A CriteriaOperator which specifies the criteria for object selection.

inTransaction Boolean

true, if the filter takes unsaved changes into account; otherwise, false. Has effect in XPO only.

Returns

Type Description
IList<T>

A IList collection that contains the persistent objects of the specified type. Only objects that satisfy the specified criteria will be retrieved to this collection.

Returns

Type Description
IList<T>

A IList collection that contains the persistent objects of the specified type. Only objects that satisfy the specified criteria will be retrieved to this collection.

Returns

Type Description
IList<T>

A IList collection that contains the persistent objects of the specified type. Only objects that satisfy the specified criteria will be retrieved to this collection.

Type Parameters

Name Description
T

Type Parameters

Name Description
T

Type Parameters

Name Description
T

Remarks

The following example uses a Parametrized Action to search for a Person by LastName, and then assigns all deferred tasks to that person.

using System.Collections.Generic;
using DevExpress.Data.Filtering;
using DevExpress.ExpressApp;
using DevExpress.ExpressApp.Actions;
using DevExpress.Persistent.Base;
using DevExpress.Persistent.Base.General;
using DevExpress.Persistent.BaseImpl;
// ...
public class AssignTasksController : ObjectViewController<ListView, MainDemo.Module.BusinessObjects.DemoTask> {
    public AssignTasksController() {
        ParametrizedAction assignTasksAction = new ParametrizedAction(
            this, "AssignTasks", PredefinedCategory.Edit, typeof(string));
        assignTasksAction.Execute += AssignTasksAction_Execute;
    }
    private void AssignTasksAction_Execute(object sender, ParametrizedActionExecuteEventArgs e) {
        IObjectSpace objectSpace = View.ObjectSpace;
        string personParamValue = e.ParameterCurrentValue as string;
        CriteriaOperator personCriteria = CriteriaOperator.Parse("Contains([LastName], ?)", personParamValue);
        Person person = (Person)objectSpace.FindObject(typeof(Person), personCriteria);
        if(person != null) {
            CriteriaOperator taskCriteria = CriteriaOperator.Parse("[Status] = ?", TaskStatus.Deferred);
            IList<MainDemo.Module.BusinessObjects.DemoTask> tasks =
                objectSpace.GetObjects<MainDemo.Module.BusinessObjects.DemoTask>(taskCriteria, false);
            foreach(MainDemo.Module.BusinessObjects.DemoTask task in tasks) {
                task.AssignedTo = person;
            }
        }
    }
}

When implementing the IObjectSpace interface in the BaseObjectSpace class's descendant, don't implement the GetObjects<T> method. It's implemented in the BaseObjectSpace class. To get the specified objects, the BaseObjectSpace.GetObjects<T>(CriteriaOperator criteria, bool inTransaction) method invokes a generic protected virtual CreateCollection method that does nothing and returns null. So, you should override the generic CreateCollection method in your descendant.

See Also