What is the best way to check if System.Collections.Generic.List<T> is updated (C# 4.0)?
-
21-12-2019 - |
Question
I need to identify if a list is updated (item added/removed). I need to use System.Collections.Generic.List<T>
, I cannot use ObservableCollection
for this (and subscribe to it's CollectionChanged
event).
Here is what I have tried so far:
I am using Fody.PropertyChanged
instead of implementing INotifyPropertyChangedEvent
- Fody Property Changed on GitHub
[AlsoNotifyFor("ListCounter")]
public List<MyClass> MyProperty
{get;set;}
public int ListCounter {get {return MyProperty.Count;}}
//This method will be invoked when ListCounter value is changed
private void OnListCounterChanged()
{
//Some opertaion here
}
Is there any better approach. Please let me know if I am doing something wrong, so that I can improve.
Solution
You can use extension methods:
var items = new List<int>();
const int item = 3;
Console.WriteLine(
items.AddEvent(
item,
() => Console.WriteLine("Before add"),
() => Console.WriteLine("After add")
)
? "Item was added successfully"
: "Failed to add item");
Extension method itself.
public static class Extensions
{
public static bool AddEvent<T>(this List<T> items, T item, Action pre, Action post)
{
try
{
pre();
items.Add(item);
post();
return true;
}
catch (Exception)
{
return false;
}
}
}
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