TreeListView.InvalidNodeExceptionCommand Property

Gets or sets a command that is executed when a node fails validation or cannot be saved to a data source.

Namespace: DevExpress.Xpf.Grid

Assembly: DevExpress.Xpf.Grid.v21.2.dll

NuGet Package: DevExpress.Wpf.Grid.Core

Declaration

C#

public ICommand<InvalidNodeExceptionArgs> InvalidNodeExceptionCommand { get; set; }

VB.NET

Public Property InvalidNodeExceptionCommand As ICommand(Of InvalidNodeExceptionArgs)

Property Value

Type	Description
DevExpress.Mvvm.ICommand<InvalidNodeExceptionArgs>	A command that is executed when a node fails validation.

Remarks

Bind a command to the InvalidNodeExceptionCommand property to maintain a clean MVVM pattern. The command works like an InvalidNodeException event handler and allows you to specify an error presentation in a View Model.

Create a command and bind it to the TreeListView.ValidateNodeCommand property to validate entered values. After this command is processed, the GridControl executes a command bound to the InvalidNodeExceptionCommand property and allows you to specify how to display validation errors.

Use the InvalidNodeExceptionArgs.ExceptionMode property to specify which action to perform when a user enters an invalid value. You can display a message box with an error description, suppress an action, throw an exception, or ignore the validation result.

Refer to the following help topic for more information: Row Validation.