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 End-User Documentation

RepositoryItemLookUpEditBase.ProcessNewValue Event

Occurs when a new value entered into the edit box is validated.

Namespace:DevExpress.XtraEditors.Repository
Assembly:DevExpress.XtraEditors.v17.2.dll

Expanded Syntax

Expanded Event Data

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

The following ProcessNewValueEventArgs properties provide information specific to this event.
Property Description
DisplayValue Gets or sets the value entered by the end-user.
Handled Gets or sets a value specifying whether the lookup editor must locate the newly inserted record.

Expanded Remarks

End-users can type new values into a lookup editor provided that the TextEditStyle property is set to TextEditStyles.Standard. When an end-user presses the Enter key or moves focus to another control, the editor searches for the row whose DisplayMember field value matches the typed text. If such a row is not found, the ProcessNewValue event is fired.

If a record matching the typed text is found, the event does not occur.

You can handle the ProcessNewValue event to add a new record representing the new text. If you add a record, you need to set the ProcessNewValueEventArgs.Handled property of the event parameter to true. This will force the editor to locate and select the newly inserted record.

Note

If the type of the data field specified by the DisplayMember property is not convertable from the String type, the LookUpEdit will not be able to locate the new record using the text inserted by the user. To overcome this issue, manually set the event's DisplayValue parameter to the new value stored in the DisplayMember field of the newly added record.

If you do not want to add a new record or you do not want the LookUpEdit to locate your new record, leave the ProcessNewValueEventArgs.Handled parameter set to false.

Note

The ProcessNewValue event may not function properly if the underlying data source does not support change notifications (specifically, if it does not provide the ListChanged event).

The editor's LookUpEditBase.ProcessNewValue event is equivalent to the current event.

Expanded Example

Suppose a lookup editor displays a list of persons in the dropdown window. Dropdown rows are retrieved from a collection of a custom ContactList class. For this purpose, the DataSource property is set to an instance of the ContactList collection. Each element in the collection represents an object of the Contact class.

The following LookUpEditBase.ProcessNewValue event handler adds new records to the data source. This occurs when the end-user enters a new name in the edit box that does not exist in the dropdown list and presses the Enter key. The entry is added by the Add method implemented in the ContactList class. The ProcessNewValueEventArgs.Handled parameter is set to true in order to force the editor to locate the newly inserted record after the event handler is performed.

Before inserting a new record, a message box is displayed and this allows the user to submit or discard the value. The following message box appears when a 'Jack Cooper' entry is entered:

After pressing the 'Yes' button, the new string is added to the list and the editor picks it up:

Expanded See Also

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