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

ColumnView.InvalidRowException Event

Fires when a row fails validation or when it cannot be saved to the data source.

Namespace:DevExpress.XtraGrid.Views.Base
Assembly:DevExpress.XtraGrid.v19.2.dll

Expanded Syntax

Expanded Event Data

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

The following InvalidRowExceptionEventArgs properties provide information specific to this event.
Property Description
ErrorText Gets or sets the error description to be displayed in the message box/tooltip.
Exception Gets the exception that caused the event.
ExceptionMode Gets or sets the type of response to supplying invalid values.
Row Gets an object which represents the row that failed validation.
RowHandle Gets the handle of the row that failed validation.
WindowCaption Gets or sets the caption of the error message box.

Expanded Remarks

If a row was modified and is about to lose focus, the View raises the ValidateRow event. You can handle the event to specify whether row data is valid. If the row fails validation or cannot be saved to the data source due to database restrictions, the InvalidRowException is raised. Note that you can avoid invalid values at the validation stage by leaving the row focused so that end-users can correct the values entered. Another alternative is to discard the changes made.

Handle the InvalidRowException event to provide a proper response to entering invalid data. The row, whose data failed validation, can be identified using the InvalidRowExceptionEventArgs.RowHandle parameter. The exception that raised the event and the error description can be obtained via the ExceptionEventArgs.Exception and ExceptionEventArgs.ErrorText parameters respectively. The actual response is specified by the ExceptionEventArgs.ExceptionMode parameter. You can display an error message box, discard changes made, raise an exception or take no action.

For more information, see the Modify and Validate Cell Values topic.

Expanded Example

The example below tracks changes made to the "Units In Stock" and "Units On Order" columns. If an edited record has its "In Stock" value less than "On Order", this row is considered invalid. In this case the e.Valid parameter of the ValidateRow event is set to false.

The default warning message does not pop up since the ExceptionMode parameter of the InvalidRowException event is set to NoAction. Instead, the SetColumnError method displays error icons in both cells.

Expanded See Also

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