Adding Sorting Capabilities to the Collection in Visual Studio .NET

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Adding Sorting Capabilities to the Collection
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Implementing sorting is a little more involved First off, there are a number of base class methods and properties that you must override The code and algorithm used for sorting is necessarily a little more complex as well There are four properties you need to override: SupportsSortingCore, IsSortedCore, SortDirectionCore, and SortPropertyCore There are two methods you also need to override: ApplySortCore and RemoveSortCore If you just needed to support sorting of the collection, things wouldn't be too complicated It is the ability to remove the sort that complicates things When you sort the collection, you need to make it so that any code that uses the collection from that point forward sees the collection in its new order That means that you have to actually change the contents of the collection to be in a different order, so that when any code iterates over the collection using its base IEnumerator interface implementation, it sees the sorted order Because you
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have to support removing the sort, you also need a way to get the contents of the collection back into their original order The simplest way to do this is to create a copy of the collection in its unsorted state before you apply the sort, and then you can restore that original collection when the sort is removed However, this too introduces another level of complexitywhat happens if a new item is added or an item is removed while the collection is being sorted That item will be added to the sorted collection, but unless you intercept every modification to the collection, the new item or the removed item won't be reflected in the copy of the original collection that you are going to restore when you remove the sort To intercept the additions and removals, you need to override some more methods from the BindingList<T> base class, such asInsertItem, RemoveItem, and ClearItems, and make sure that the same changes get made to the unsorted collection as well as the primary collection You also have to worry about transacted additions to the collection, so you will need overrides of EndNew and CancelNew, as well as transacted removals from the unsorted collection As you can see, things can get complicated pretty quickly To demonstrate some basic sorting capability, let's not support the addition or removal of items in the collection when it is sorted You still have to make a copy of the existing collection before applying the sort and revert to that collection when the sort is removed, but you don't have to worry about items being added or removed and maintaining the parallel collection while sorted The List<T> class has sorting capability built in, as mentioned before, and you can use that to do the actual sorting for you It does the sort based on a generic implementation of the IComparer<T> interface that you provide to the method To implement this interface, you create a class with a method named Compare that compares to objects of type T and returns an integer that indicates whether the first object is equal to, greater than, or less than the second object What criteria you use to decide which value to return is up to you and your implementation of the interface The implementation in Listing 94 was inspired by the "Wonders of Windows Forms" column by Michael Weinhardt in MSDN Online, which itself was inspired by an earlier article by Rocky Lhotka I chose a different implementation strategy and added capability for multiproperty sorts, as discussed later in the implementation of the IBindingListView interface, but some of the basic details of the following implementation were based on Michael's Custom Data Binding series from the winter of 2004 The SortComparer class shown in Listing 94 provides the basic comparison implementation to be used with theList<T>Sort method
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