public static IDisposable BindValidation <TView, TViewModel, TViewProperty>(
this TView view,
TViewModel viewModel,
Expression <Func <TView, TViewProperty> > viewProperty)
where TViewModel : ReactiveObject, IValidatableViewModel
where TView : IViewFor <TViewModel>
{
return(ValidationBinding.ForViewModel <TView, TViewModel, TViewProperty>(view, viewProperty));
}
public static IDisposable BindValidation <TView, TViewModel, TViewProperty>(
this TView view,
TViewModel?viewModel,
Expression <Func <TView, TViewProperty> > viewProperty,
IValidationTextFormatter <string>?formatter = null)
where TView : IViewFor <TViewModel>
where TViewModel : class, IReactiveObject, IValidatableViewModel
{
if (viewProperty is null)
{
throw new ArgumentNullException(nameof(viewProperty));
}
return(ValidationBinding.ForViewModel <TView, TViewModel, TViewProperty>(view, viewProperty, formatter));
}
public static IDisposable BindValidation <TView, TViewModel, TViewProperty>(
this TView view,
TViewModel viewModel,
Expression <Func <TView, TViewProperty> > viewProperty)
where TViewModel : ReactiveObject, IValidatableViewModel
where TView : IViewFor <TViewModel>
{
if (viewModel is null)
{
throw new ArgumentNullException(nameof(viewModel));
}
if (viewProperty is null)
{
throw new ArgumentNullException(nameof(viewProperty));
}
return(ValidationBinding.ForViewModel <TView, TViewModel, TViewProperty>(view, viewProperty));
}
public void ShouldSupportViewModelActionBindingRequiredForPlatformSpecificImplementations()
{
const string nameErrorMessage = "Name should not be empty.";
var view = new TestView(new TestViewModel {
Name = string.Empty
});
view.ViewModel.ValidationRule(
vm => vm.Name,
s => !string.IsNullOrEmpty(s),
nameErrorMessage);
ValidationBinding.ForViewModel <TestView, TestViewModel, string>(
view,
errorText => view.NameErrorLabel = errorText,
SingleLineFormatter.Default);
Assert.False(view.ViewModel.ValidationContext.IsValid);
Assert.Equal(1, view.ViewModel.ValidationContext.Validations.Count);
Assert.NotEmpty(view.NameErrorLabel);
Assert.Equal(nameErrorMessage, view.NameErrorLabel);
}
