PagedAsyncSource Class

The asynchronous paged source.

Namespace: DevExpress.Xpf.Data

Assembly: DevExpress.Xpf.Core.v20.1.dll

NuGet Packages: DevExpress.WindowsDesktop.Wpf.Core, DevExpress.Wpf.Core

Declaration

C#

public sealed class PagedAsyncSource :
    PagedSourceBase

VB.NET

Public NotInheritable Class PagedAsyncSource
    Inherits PagedSourceBase

Remarks

Refer to the Virtual Sources Overview topic to learn more.

Example

• How to Bind to PagedAsyncSource - demonstrates how to bind the GridControl to PagedAsyncSource.

Demo

• Paged Source

  Requires a WPF Subscription. Download

Tutorials

• How to Use Virtual Sources
• How to Bind to a Custom Service with Restrictions

Workflow

The PagedAsyncSource raises events in the UI Thread and uses tasks to process data in parallel Working Threads. You should provide tasks to these events to obtain summaries, rows, etc. Then the UI Thread gets data you fetched.

1. (Optional step) The PagedAsyncSource raises the PagedAsyncSource.GetTotalSummaries event. Handle this event and process summaries if you want to show them in the GridControl.
2. The PagedAsyncSource raises the PagedAsyncSource.FetchPage event to get the first portion of data.
3. When end users navigate to the next page, the PagedAsyncSource raises the PagedAsyncSource.FetchPage event to get the next portion of data.
4. (Optional step) When end users apply a filter, the PagedAsyncSource raises the PagedAsyncSource.GetUniqueValues event to get unique values and show them in a drop-down filter.

Inheritance

Object

BindableBase

VirtualSourceBase

PagedSourceBase

PagedAsyncSource