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Create ObservableCollection from IList with grouping


Create ObservableCollection from IList with grouping

By : Tammy O'Hara Potvin
Date : November 17 2020, 11:52 AM
may help you . Im trying to pass a grouped observable collection to my view.
code :
  gp=new ObservableCollection(groupedPeople);


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IList<T> to ObservableCollection<T>

IList<T> to ObservableCollection<T>


By : Nick Novikov
Date : March 29 2020, 07:55 AM
it should still fix some issue I have a method in a Silverlight app that currently returns an IList and I would like to find the cleanest way to turn this into an ObservableCollection so: , You could write a quick and dirty extension method to make it easy
code :
public static ObservableCollection<T> ToObservableCollection<T>(this IEnumerable<T> enumerable) {
  var col = new ObservableCollection<T>();
  foreach ( var cur in enumerable ) {
    col.Add(cur);
  }
  return col;
}
return GetIlist().ToObservableCollection();
Add elements from IList to ObservableCollection

Add elements from IList to ObservableCollection


By : jaymbooz
Date : March 29 2020, 07:55 AM
Hope this helps I have an ObservableCollection, and I'd like to set the content of an IList to this one. Now I could just create a new instance of the collection..: , You could do
code :
public void Foo(IList<Bar> list)
{
    list.ToList().ForEach(obs.Add);
}
    public static void AddRange<T>(this ObservableCollection<T> collection, IEnumerable<T> items)
    {
        items.ToList().ForEach(collection.Add);
    }    
IList<T>, IEnumerable<T> and ObservableCollection<T>

IList<T>, IEnumerable<T> and ObservableCollection<T>


By : chandrika chetty
Date : March 29 2020, 07:55 AM
this will help The problem is with covariance. An ObservableCollection isn't an ObservableCollection, and ditto with lists. Here's an example of why not:
code :
ObservableCollection<string> strings = new ObservableCollection<string>();

// This is invalid, but it's what you're trying to do, effectively.
ObservableCollection<object> objects = strings;

// This would have to work... it's fine...
objects.Add(new object());

// And this should be fine too...
string x = strings[0];
// There's nothing you can do to violate type safety here...
Observable<string> strings = new ObservableCollection<string>();
IEnumerable<object> objects = strings;
IList grouping then create new listarray

IList grouping then create new listarray


By : 李恺林
Date : March 29 2020, 07:55 AM
wish help you to fix your issue there have a IList<> have 12 elements, , Try this code:
code :
static void Main(string[] args)
{
    var list = new List<int> { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };

    foreach (var b in Batch(list))
    {
        foreach (var n in b)
            Console.Write(n + " ");
        Console.WriteLine();
    }
}

static IEnumerable<IList<int>> Batch(IList<int> list)
{
    for (int i = 0; i < list.Count; i += 2)
    {
        var batch = new List<int>();

        for (int j = i; j < i + 3; j++)
            if (j < list.Count)
                batch.Add(list[j]);

        int count = batch.Count;

        for (int j = 0; j < 3 - count; j++)
            batch.Add(list[j]);

        yield return batch;
    }
}
How to cast IList to ObservableCollection<T>

How to cast IList to ObservableCollection<T>


By : Sanjay Bora
Date : March 29 2020, 07:55 AM
will be helpful for those in need CollectionChanged is defined in INotifyCollectionChanged interface. ObservableCollection implements INotifyCollectionChanged.
so for the purpose of subscription to event you can cast ItemsSource to INotifyCollectionChanged:
code :
var list = ItemsSource as INotifyCollectionChanged;
if (list != null)
    list.CollectionChanged += list_CollectionChanged;
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