public ExistingUpdatableObservableViewModelBuilderOptions(IObservableViewModel viewModel)
{
if (viewModel == null)
{
throw new ArgumentNullException("viewModel");
}
ViewModel = viewModel;
}
public void ToViewModel_ShouldSaveViewModel(
Task <object> source,
TestSchedulers scheduler)
{
//arrange
IObservableViewModel viewModel = null;
var sut = new ObservableViewModelBuilderOptions <object>(model => viewModel = model, ct => source, scheduler);
//act
var actual = sut.ToViewModel();
//assert
actual.Should().Be(viewModel.As <ObservableViewModel <object> >());
}
public static IObservable <TProperty> Changed <TProperty>(this IObservableViewModel vm,
Expression <Func <TProperty> > propertyExpression)
{
if (!(propertyExpression.Body is MemberExpression member))
{
throw new ArgumentException(string.Format(
"Expression '{0}' refers to a method, not a property.",
propertyExpression.ToString()));
}
var propInfo = member.Member as PropertyInfo;
if (propInfo == null)
{
throw new ArgumentException(string.Format(
"Expression '{0}' refers to a field, not a property.",
propertyExpression.ToString()));
}
return(vm.Changed.Where(c => c.PropertyName == propInfo.Name)
.Select(c => propertyExpression.Compile().Invoke()));
}