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JsonDataSource.FillError Event

Occurs when an attempt to fill the data source fails.

Namespace: DevExpress.DataAccess.Json

Assembly: DevExpress.DataAccess.v22.2.dll

NuGet Package: DevExpress.DataAccess


public event DataSourceFillErrorEventHandler FillError

Event Data

The FillError event's data class is DataSourceFillErrorEventArgs. The following properties provide information specific to this event:

Property Description
ConnectionName Specifies the name of the JSON data source connection that was used when the FillError event occurred.
Exception Gets the exception that caused the FillError event.
Handled Gets or sets whether the FillError event has been handled.


This event occurs when a call to the Fill() method fails to populate the data source with data. Handle this event to process the following exceptions:

  • WebExceptions that occur when the endpoint’s Uri is not accessible.
  • IOExceptions that occur on failed attempts to load JSON data from the file system.
  • JSON data parse errors.

Use the following properties to retrieve the exception details:

The JsonDataSourceException exception occurs instead of the WebException, IOException, and parse errors. Catch this exception as an alternative to the FillError event.

try {
catch(JsonDataSourceException e) {
  //do something


The code sample below creates a new data source, handles the FillError event to to process exceptions, and tries to populate the data source with data.

using DevExpress.DataAccess;
using DevExpress.DataAccess.Json;
// ...
// Create a new JSON source.
var jsonSource = new UriJsonSource() {
    Uri = new Uri(@"https://invalid.json")
// Assign the JSON source to the data source.
var datasource = new JsonDataSource() {
    JsonSource = jsonSource
datasource.FillError += (s, e) => {
    e.Handled = true;
    // Add code that handles the data source fill error here.
See Also