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View this topic on docs.devexpress.com (Learn more)

VirtualServerModeSource.ConfigurationChanged Event

Fires on initial data load and reload in the bound grid control, and when the data grid's sort and filter configuration changes. Allows you to initialize the data source and (optionally) return an initial batch of records.

Namespace:DevExpress.Data
Assembly:DevExpress.Data.v19.2.dll

Expanded Syntax

Expanded Event Data

The event handler receives an argument of type VirtualServerModeRowsEventArgs containing data related to this event.

The following VirtualServerModeRowsEventArgs properties provide information specific to this event.
Property Description
CancellationToken Gets a token that allows you to respond to a task cancellation request invoked by the grid control.
ConfigurationInfo Gets information on the grid's current sorting, filtering and summary configuration.
CurrentRowCount Gets the count of rows currently loaded to the grid.
RowsTask Gets or sets the task that returns requested rows.
UserData

Read this parameter to get custom data passed from the previously called Task or ConfigurationChanged event handler. When handling the ConfigurationChanged event, set the UserData event parameter to pass custom data to a subsequent MoreRows event handler (unless you specify the RowsTask event parameter).

Expanded Remarks

The ConfigurationChanged event fires in the following cases:

The ConfigurationChanged event allows you prepare your data for the load in the grid control, and optionally provide an initial batch of rows. To provide a batch of rows, create a Task that will return requested rows, and assign this task to the RowTask event parameter. To provide subsequent batches of rows (when required), handle the MoreRows event.

You can provide an initial and subsequent batches of rows by handling a single event - MoreRows. In this case, if you handle the ConfigurationChanged event, leave the event's RowTask parameter set to null.

Tip

A Task typically executes asynchronously. To return a batch of rows synchronously, create the task with the Task.FromResult method (available in .NET Framework 4.5+).

Expanded See Also

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