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 End-User Documentation

DataLayoutControl.FieldRetrieving Event

Fires before a layout item with an embedded editor is generated and thus, prior to the editor's data binding. It allows you to customize the type of editor to be generated, modify editor binding settings and hide certain editors.

Namespace:DevExpress.XtraDataLayout
Assembly:DevExpress.XtraLayout.v17.2.dll

Expanded Syntax

Expanded Event Data

The event handler receives an argument of type DevExpress.XtraDataLayout.FieldRetrievingEventArgs containing data related to this event.

Expanded Remarks

The FieldRetrieving event fires before layout items and editors are created at runtime in the following cases:

  • When the RetrieveFields method is called.
  • When automatic layout generation is invoked at runtime. This feature is invoked each time the DataSource property is set to a new value, provided that the AutoRetrieveFields property is enabled.

The FieldRetrieving event fires for each public field in the underlying data source. Handle this event to customize the type of editor to be generated, modify editor binding settings and to hide certain editors (hidden layout items will be accessible at runtime from the Customization Form).

For changes made in the FieldRetrieving event to be in effect, set the event's Handled parameter to true.

Expanded Example

Show Me

A complete sample project is available in the DevExpress Code Examples database at http://www.devexpress.com/example=T246872.

This example shows how to handle the FieldRetrieving and FieldRetrieved events to customize binding information, and settings of auto-generated layout items and embedded editors.

In the example, the FieldRetrieving event is handled to assign a ComboBoxEdit control for editing the ZipCode field. Items are added to the ComboBoxEdit after the editor is created (in the FieldRetrieved event).

In the FieldRetrieving event handler, the DataSourceUpdateMode parameter is set to OnPropertyChanged. For instance, this forces the "Full Name" field to be updated immediately on typing text in the "First Name" and "Last Name" fields.

The following image shows the result:

Expanded See Also

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