I have two controls on some panel: textbox and combobox:
<TextBox Text="{Binding ShapeName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" />
<ComboBox SelectedItem="{Binding ActiveStageViewModel, Mode=OneWayToSource, UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" />
I need to force idataerrorinfo validation for textbox, when I select something on combobox. How to do that?
The code from viewmodel:
string IDataErrorInfo.this[string propertyName]
{
get
{
var error = string.Empty;
if (propertyName == Expression.GetPropertyName(() => ActiveStageViewModel))
{
// TODO: Add functionality to force ShapeName property validation
return error;
}
if (propertyName == Expression.GetPropertyName(() => ShapeName))
{
error = ValidateShapeName();
}
TooltipMessage = error;
return error;
}
}
Just raise the NotifyPropertyChanged
event for the property you want to validate or if you are in .NET 4.5 or Silverlight 4 use the INotityDataErrorInfo.