public virtual void Reset(IEnumerable <T> collection)
{
if (collection.IsNullOrEmpty() && this.Items.IsNullOrEmpty())
{
return;
}
// Step 0: Check if collection is exactly same as this.Items
if (IEnumerableUtils.Equals <T>(collection, this.Items))
{
return;
}
int count = this.Count;
// Step 1: Clear the old items
this.Items.Clear();
// Step 2: Add new items
if (!collection.IsNullOrEmpty())
{
foreach (T item in collection)
{
this.Items.Add(item);
}
}
// Step 3: Don't forget the event
if (this.Count != count)
{
this.OnPropertyChanged(new PropertyChangedEventArgs("Count"));
}
this.OnPropertyChanged(new PropertyChangedEventArgs("Item[]"));
this.OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
}
/// <summary>
/// The column which provides row numbers for this table
/// </summary>
ICompositeKey BuildPrimaryKey()
{
if (ParentStatement.SelectColumns == null)
{
throw new InvalidOperationException("Column accessed before ParentStatment initialized.");
}
var pks = IEnumerableUtils.Create(
Math.Max(1, ExplicitPrimaryKeys),
GetPk);
return(new CompositeKey(pks));
ISelectColumn GetPk(int index)
{
var alias = Alias == SqlStatementConstants.RootObjectAlias
? SqlStatementConstants.PrimaryKeyName + index
: $"{Alias}.{SqlStatementConstants.PrimaryKeyName}{index}";
return(ParentStatement.SelectColumns[alias]);
}
}
