.NET Framework 4.5.2+
.NET Framework 4.5.2+
.NET Standard 2.0+

Session.GetObjectByKeyAsync(XPClassInfo, Object, Boolean, CancellationToken) Method

Asynchronously returns a persistent object that has the specified key property value from a data store.

Namespace: DevExpress.Xpo

Assembly: DevExpress.Xpo.v20.2.dll

Declaration

public Task<object> GetObjectByKeyAsync(
    XPClassInfo classInfo,
    object id,
    bool alwaysGetFromDataStore,
    CancellationToken cancellationToken = default(CancellationToken)
)
Public Function GetObjectByKeyAsync(
    classInfo As XPClassInfo,
    id As Object,
    alwaysGetFromDataStore As Boolean,
    cancellationToken As CancellationToken = Nothing
) As Task(Of Object)

Parameters

Name Type Description
classInfo XPClassInfo

An XPClassInfo object which contains the metadata information of the class.

id Object

An object which represents the key property's value of the persistent object.

alwaysGetFromDataStore Boolean

true, to always reload the persistent object from storage even if it is found in memory; otherwise, false.

Optional Parameters

Name Type Default Description
cancellationToken CancellationToken

null

A CancellationToken object that delivers a cancellation notice to the running operation.

Returns

Type Description
Task<Object>

A Task that returns a persistent object from a data store. This persistent object has the specified key property value. The task returns null if no objects are found.

Remarks

Below is an example of using the GetObjectByKeyAsync method. Here, the session is the Session instance.

using System.Threading;
using DevExpress.Xpo;
using DevExpress.Xpo.Metadata;
// ...
XPClassInfo personClassInfo = session.GetClassInfo(typeof(Person));
CancellationTokenSource source = new CancellationTokenSource();
CancellationToken cancellationToken = source.Token;
Person personToDelete = 
    (Person)await session.GetObjectByKeyAsync(personClassInfo, 152, true, cancellationToken);
session.Delete(personToDelete);

The GetObjectByKeyAsync method searches in memory for the object with the specified key property value. If such an object is found, it is not reloaded. To get the up-to-date object from storage the alwaysGetFromDataStore parameter must be set to true.

See Also