How do I change the state of List which is part of view model in extension method so the view model reflects this change without having to re assign the value
Code:
//ViewModel:
//This line should modify the change internally wihtout having to reassign like
// ..Selected =model.CheckBoxList.Selected.RemoveWhere(c => c.SelectedValue == null)
model.CheckBoxList.Selected.RemoveWhere(c => c.SelectedValue == null)
Extension Method :
public static IEnumerable<T> RemoveWhere<T>(this IEnumerable<T> source, Predicate<T> predicate)
{
var x = source.ToList();
x.RemoveAt(1);
source = x;
return source;
}
Update:
public class CheckBoxList
{
public CheckBoxList()
{
//Selected = new List<CheckBoxListViewModel>();
}
[XmlElement("SelectedItem")]
public List<CheckBoxListViewModel> Selected { get; set; }
}
[XmlRoot(ElementName = "MyClass")]
public class CheckBoxListViewModel
{
public string SelectedValue { get; set; }
public string SelectedDescription { get; set; }
}
Assign a parameter has no effect on the expression you pass to the method.
You instead want to mutate the existing instance. To do that, you need to accept a mutable type; namely, List<T>.
List<T> already has a RemoveAll() function which does exactly that, so you don't need to do anything at all.
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