InfiniteAsyncSource Class

A virtual source component that allows you to bind the GridControl to a data source and display data with infinite scrolling.

Namespace: DevExpress.Xpf.Data

Assembly: DevExpress.Xpf.Core.v21.2.dll

Declaration

public sealed class InfiniteAsyncSource :
    InfiniteSourceBase,
    IEditableCollectionView

Remarks

VirtualSourcesTutorialAll

Run Demo: Infinite Scrolling Source

View Example: How to Bind to InfiniteAsyncSource View Example: How to Use InfiniteAsyncSource In Single Thread

Read Tutorial: How to Use Virtual Sources Read Tutorial: How to Bind to a Custom Service with Restrictions

Workflow

The InfiniteAsyncSource 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. and enable the UI Thread to get data you fetched.

VirtualSourcesAsync

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

You can maintain a clean MVVM pattern and specify operations above in a ViewModel. To do this, create a command and bind it to the corresponding property:

Event Property Description
GetTotalSummaries GetTotalSummariesCommand Gets or sets a command that allows you to get total summaries.
FetchRows FetchRowsCommand Gets or sets a command that allows you to fetch rows.
GetUniqueValues GetUniqueValuesCommand Gets or sets a command that allows you to get unique values.
See Also