The key method of the ErrorProvider component is the SetError method, which specifies the error message string and where the error icon should appear. When the DataSource property is set, the ErrorProvider component can display error messages for a dataset. The Icon property can be set to a custom error icon instead of the default. When the component is added in the designer, the ContainerControl property is set to the containing form if you add the control in code, you must set it yourself. When using ErrorProvider component with data-bound controls, the ContainerControl property must be set to the appropriate container (usually the Windows Form) in order for the component to display an error icon on the form. The ErrorProvider component's key properties are DataSource, ContainerControl, and Icon. In other words: If Property A is set to something and property B a. The requirements is to have at least one property null. ![]() The ErrorProvider component displays an error icon ( ) next to the relevant control, such as a text box when the user positions the mouse pointer over the error icon, a ToolTip appears, showing the error message string. I have a CSLA object with two managed properties and a custom Attribute. An error provider is a better alternative than displaying an error message in a message box, because once a message box is dismissed, the error message is no longer visible. It is typically used in conjunction with validating user input on a form, or displaying errors within a dataset. Just very useful when rules are specific regarding the situation.The Windows Forms ErrorProvider component is used to validate user input on a form or control. This.NotifyPropert圜hanged("ToolTipNameEnable") This.NotifyPropert圜hanged("BordertbName") Then ViewModel : private string errorName I set my TextBox, with a BorderBrush, and ToolTip, regarding my conditions I will Hide/Display ToolTip and color border :Ĭode Behind (LostFocus = Leave for whom used to WindowsForm) : private void tbName_LostFocus(object sender, RoutedEventArgs e) ![]() I think using MVVM is very well adapted to manage any situation :
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