Session.PreFetchAsync<T>(IEnumerable<T>, String, IEnumerable, CancellationToken) Method

Asynchronously forces associated collection data loading for specified parent objects.

Namespace: DevExpress.Xpo

Assembly: DevExpress.Xpo.v18.2.dll

Declaration

C#

public Task PreFetchAsync<T>(
    IEnumerable<T> objects,
    string collectionInObjects,
    IEnumerable collectionsContent,
    CancellationToken cancellationToken
)

VB.NET

Public Function PreFetchAsync(Of T)(
    objects As IEnumerable(Of T),
    collectionInObjects As String,
    collectionsContent As IEnumerable,
    cancellationToken As CancellationToken
) As Task

Parameters

Name	Type	Description
objects	IEnumerable<T>	An IEnumerable list of parent objects.
collectionInObjects	String	A string which is the name of the associated collection property.
collectionsContent	IEnumerable	An IEnumerable list of the collection’s content. If a certain part of the collectionInObjects data was previously loaded, you can avoid reloading it by passing the loaded data to the collectionsContent parameter.
cancellationToken	CancellationToken	A CancellationToken object that delivers a cancellation notice to the running operation.

Type Parameters

Name
T

Returns

Type	Description
Task	A Task that forces associated collection data loading for specified parent objects.

Remarks

By default, data is loaded automatically when you access a nested collection for the first time. The PreFetchAsync<T> method loads required associated collection data for a parent object at once. No additional SQL queries for this data will be will be performed later.