/// <summary>
/// Gets or sets the element at the specified index.
/// </summary>
/// <param name="index">The zero-based index of the element to get or set.</param>
/// <returns>The element at the specified index.</returns>
/// <exception cref="ArgumentOutOfRangeException">index is not a valid index in the <see cref="ObservableCollection{T}"/>.</exception>
/// <exception cref="NotSupportedException">The property is set and the <see cref="ObservableCollection{T}"/> is read-only.</exception>
public T this[int index]
{
get
{
if (index >= 0 && index < this.innerList.Count)
{
this.atom.ReportObserved();
}
return(this.innerList[index]);
}
set
{
if (index >= 0 && index < this.innerList.Count && !this.IsReadOnly)
{
this.atom.CheckIfStateModificationsAreAllowed();
var oldValue = this.innerList[index];
var changeEventArgs = new ObservableCollectionChangeEventArgs <T>()
{
Cancel = false,
Context = this,
NewValue = value,
OldValue = oldValue,
};
this.InterceptChange(changeEventArgs);
if (changeEventArgs.Cancel || !changeEventArgs.Changed)
{
return;
}
var newValue = this.enhancer.Enhance(changeEventArgs.NewValue, oldValue, this.Name);
if (!Equals(oldValue, newValue))
{
if (newValue is IReactiveObject reactiveObject)
{
if (reactiveObject.SharedState != this.SharedState)
{
throw new InvalidOperationException(string.Format(CultureInfo.CurrentCulture, Resources.DifferentSharedStates, this.Name));
}
}
this.innerList[index] = newValue;
this.NotifyArrayChildUpdate(index, newValue, oldValue);
}
}
else
{
// this will trap
this.innerList[index] = value;
}
}
}
/// <summary>
/// Gets or sets the element at the specified index.
/// </summary>
/// <param name="index">The zero-based index of the element to get or set.</param>
/// <returns>The element at the specified index.</returns>
/// <exception cref="ArgumentOutOfRangeException">index is not a valid index in the <see cref="ObservableCollection{T}"/>.</exception>
/// <exception cref="NotSupportedException">The property is set and the <see cref="ObservableCollection{T}"/> is read-only.</exception>
public T this[int index]
{
get
{
if (index >= 0 && index < this.innerList.Count)
{
this.atom.ReportObserved();
}
return(this.innerList[index]);
}
set
{
if (index >= 0 && index < this.innerList.Count && !this.IsReadOnly)
{
this.atom.CheckIfStateModificationsAreAllowed();
var oldValue = this.innerList[index];
var changeEventArgs = new ObservableCollectionChangeEventArgs <T>()
{
Cancel = false,
Context = this,
NewValue = value,
OldValue = oldValue,
};
this.InterceptChange(changeEventArgs);
if (changeEventArgs.Cancel || !changeEventArgs.Changed)
{
return;
}
var newValue = this.enhancer.Enhance(changeEventArgs.NewValue, oldValue, this.Name);
if (!Equals(oldValue, newValue))
{
this.innerList[index] = newValue;
this.NotifyArrayChildUpdate(index, newValue, oldValue);
}
}
else
{
// this will trap
this.innerList[index] = value;
}
}
}
