SortComparer Simple Implementation in Visual Studio .NET

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Listing 94 SortComparer Simple Implementation
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class SortComparer<T> : IComparer<T> { private PropertyDescriptor m_PropDesc = null; private ListSortDirection m_Direction = ListSortDirectionAscending; public SortComparer(PropertyDescriptor propDesc, ListSortDirection direction) { m_PropDesc = propDesc; m_Direction = direction; } int IComparer<T>Compare(T x, T y) { object xValue = m_PropDescGetValue(x); object yValue = m_PropDescGetValue(y); return CompareValues(xValue, yValue, m_Direction); } private int CompareValues(object xValue, object yValue, ListSortDirection direction) { int retValue = 0;
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if (xValue is IComparable) // Can ask the x value { retValue = ((IComparable)xValue)CompareTo(yValue); } else if (yValue is IComparable) //Can ask the y value { retValue = ((IComparable)yValue)CompareTo(xValue); } // not comparable, compare String representations else if (!xValueEquals(yValue)) { retValue = xValueToString()CompareTo(yValueToString()); } if (direction == ListSortDirectionAscending) { return retValue; } else { return retValue * -1; } } }
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The SortComparer class lets you construct an instance of the class and specify what property on the objects will be compared to determine equality, greater than, or less than values by passing in a PropertyDescriptor and a ListSortDirection enumeration value When the List<T> class iterates over the list, applying its internal sort algorithm, it calls the Compare method, and passes in two objects that it is currently working with to set up the sort The Compare implementation in Listing 94 tries a number of ways to compare the objects It first extracts the specified property's current value for each of the objects using the GetValue method on the property descriptor It then sees if the object that those values represent implements the IComparer interface This is a standard interface in the NET Framework It implements a CompareTo method that embeds the same logic that we are looking forspecifically, that if the object itself decides it is equal to the other object passed in, it will return 0; if it is greater, it will return 1; and if it is less than, it will return 1 If the property values don't implement IComparer, but the Equals method on the value says that it is equal to the other object, then Compare returns 0, indicating equality Finally, if none of those tests succeed, the property values are converted to strings and their string representations are compared using the CompareTo method, which the String class implements The final thing the method does is to look at the sort direction, and if it indicates that it should be a descending sort, it multiplies the returned value by 1 to reverse the greater than/less than meaning To perform the sort from your BindingListView<T> class, you need to provide the overrides of all the sort-related methods and properties from the base class These are shown in Listing 95
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Listing 95 Sorting Functionality on CustomerCollection Class
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public class BindingListView<T> : BindingList<T> { private bool m_Sorted = false; private ListSortDirection m_SortDirection = ListSortDirectionAscending; private PropertyDescriptor m_SortProperty = null; private List<T> m_OriginalCollection = new List<T>();
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// constructors, AddNew, etc omitted protected override bool SupportsSearchingCore { get { return true; } } protected override bool SupportsSortingCore { get { return true; } } protected override bool IsSortedCore { get { return m_Sorted; } } protected override ListSortDirection SortDirectionCore { get { return m_SortDirection; } } protected override PropertyDescriptor SortPropertyCore { get { return m_SortProperty; } } protected override void ApplySortCore(PropertyDescriptor property, ListSortDirection direction) { m_SortDirection = direction; m_SortProperty = property; SortComparer<T> comparer = new SortComparer<T>(property,direction); ApplySortInternal(comparer); } private void ApplySortInternal(SortComparer<T> comparer) { // store the original order of the collection if (m_OriginalCollectionCount == 0) { m_OriginalCollectionAddRange(this); } List<T> listRef = thisItems as List<T>; if (listRef == null) return; // Let List<T> do the actual sorting based on your comparer listRefSort(comparer); m_Sorted = true; OnListChanged(new ListChangedEventArgs( ListChangedTypeReset, -1)); } protected override void RemoveSortCore() { if (!m_Sorted)
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return; Clear(); foreach (T item in m_OriginalCollection) { Add(item); } m_OriginalCollectionClear(); m_SortProperty = null; m_Sorted = false; } }
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The additions to the class include the following: An override of IsSortedCore, which indicates whether the collection is currently sorted An override of SortDirectionCore, which provides the sort direction An override of the SortPropertyCore, which indicates which property the sort is based on An ApplySortCore method override, which sets the above properties when it is called by the base class in response to an IBindingListApplySort call This method delegates to an ApplySortInternal helper method to do most of the work of the sorting A RemoveSortCore method override that resets the properties appropriately when it is called by the base class in response to an IBindingListRemoveSort call A member variable of type List<T> is declared to hold the unsorted collection when a sort is applied
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The ApplySortCore method creates a SortComparer object for the specified sort property and direction, and passes that to the helper ApplySortInternal method The ApplySortInternal method checks the unsorted collection to see if it has been populated, and if not, adds all the current values to it in the order that they exist in the collection at the time that ApplySort is called The check for the list being populated is in case the list is sorted several times in succession ApplySortInternal then casts the Items collection that your class inherited to a List<T> reference and calls the Sort method on it, passing in theSortComparer object This causes the items in the collection maintained by the base class to be sorted according to the criteria provided to the SortComparer class and the comparison logic implemented in that class Finally, the ApplySortInternal method sets the flag that indicates that the collection is sorted and fires an event through a call to the base class OnListChanged method indicating that the list has changed The Reset type of change is most appropriate, since potentially every item in the list has been moved around The RemoveSortCore method clears the current collection again and refills it with the values that were stored in the original collection list It then clears the original collection list and sets the member variables used by the algorithm appropriately to indicate that no sort is currently applied To make the list so that items cannot be changed when the collection is sorted, you need to add overridden implementations of the appropriate IBindingList methods: bool IBindingListAllowNew { get { return CheckReadOnly(); } } bool IBindingListAllowRemove { get
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This document was created by an unregistered ChmMagic, please go to http://wwwbisentercom to register it Thanks { return CheckReadOnly(); } } private bool CheckReadOnly() { if (m_Sorted || m_Filtered) { return false; } else { return true; } }
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This code conditionally returns a different value forAllowAdd and AllowRemove based on whether the collection is sorted or filtered (the filtering support is added later in this chapter) With that code in place, you can now change your CustomersCollection derivation, as well as theOrders collection contained in the Customer class Now both theCustomersCollection (bound to the first grid) and the child collection namedOrders on each Customer object (bound to the second grid) will support sorting: public class CustomerCollection : BindingListView<Customer> { // AddNew implementation shown earlier } public class Customer : IEditableObject, INotifyPropertyChanged { private BindingListView<Order> m_Orders = new BindingListView<Order>(); // The rest of the Order class implementation }
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