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CHAPTER 5 s COMPLETING THE FRAMEWORK
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public bool AllowEdit { get { if (_supportsBinding) return _bindingList.AllowEdit; else return false; } } Recall from the constructor that if the original collection doesn t implement IBindingList, then _supportsBinding will be false. In that case, AllowEdit returns false because in-place editing isn t valid unless the original collection implements IBindingList. This technique is repeated for all the IBindingList properties.
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Applying a Sort
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The IBindingList interface allows a sort to be applied to a collection, either ascending or descending, based on a single property. This is done through the ApplySort() method.
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SortedBindingList implements two overloads of ApplySort(), making it possible to apply a sort based on the string name of the property as well as by a PropertyDescriptor as required by IBindingList: public void ApplySort(string propertyName, ListSortDirection direction) { _sortBy = null; if (!String.IsNullOrEmpty(propertyName)) { Type itemType = typeof(T); foreach (PropertyDescriptor prop in TypeDescriptor.GetProperties(itemType)) { if (prop.Name == propertyName) { _sortBy = prop; break; } } } ApplySort(_sortBy, direction); } public void ApplySort( PropertyDescriptor property, ListSortDirection direction) { _sortBy = property; _sortOrder = direction; DoSort(); } The first overload creates a PropertyDescriptor for the named property and calls the second overload. The second overload will also be called directly by data binding. It sets the _sortBy and
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_sortOrder fields to indicate the sort parameters, and calls DoSort(). The reason these two instance fields are used to store the parameters is that these values are also exposed by public properties such as SortDirection: public ListSortDirection SortDirection { get { return _sortOrder; } } The DoSort() method actually does the sorting by assembling the key values into a private collection and then sorting those values. Associated with each key value is a reference to the corresponding item in the original collection.
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Associating the value of the property by which to sort with a reference to the corresponding child object in the original collection requires a key/value list, which in turn requires a key/value class. The ListItem class maintains a relationship between a key and a reference to the corresponding child object. The key value is the value of the property from the child object on which the collection is to be sorted. For example, when sorting a collection of Customer objects by their Name property, the key value will be the contents of the Name property from the corresponding child object. Rather than maintaining an actual object reference, ListItem maintains the index value of the child item in the original collection. This is referred to as the base index: private class ListItem : IComparable<ListItem> { private object _key; private int _baseIndex; public object Key { get { return _key; } } public int BaseIndex { get { return _baseIndex; } set { _baseIndex = value; } } public ListItem(object key, int baseIndex) { _key = key; _baseIndex = baseIndex; } public int CompareTo(ListItem other) { object target = other.Key; if (Key is IComparable) return ((IComparable)Key).CompareTo(target);
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CHAPTER 5 s COMPLETING THE FRAMEWORK
else { if (Key.Equals(target)) return 0; else return Key.ToString().CompareTo(target.ToString()); } } public override string ToString() { return Key.ToString(); } } In addition to associating the property value to the base index of the child object in the original collection, ListItem implements IComparable<T>. This interface enables the .NET Framework to sort a collection of ListItem objects. This interface requires implementation of the CompareTo() method, which is responsible for comparing one ListItem object to another. Of course, it is the key value that is to be compared, so CompareTo() simply compares the value of its Key property to the Key property from the other ListItem object. If the type of the key value implements IComparable, then the call simply delegates to that interface: if (Key is IComparable) return ((IComparable)Key).CompareTo(target); Otherwise things are a bit more complex. Obviously, any objects can be compared for equality, so that part is straightforward: if (Key.Equals(target)) return 0; However, if the type of the key value doesn t implement IComparable, then there s no easy way to see if one is greater than the other. To overcome this problem, both values are converted to their string representations, which are then compared to each other: return Key.ToString().CompareTo(target.ToString()); While this is not perfect, it is the best we can do. And really this is an extreme edge case since most types are comparable, including strings, numeric types, and dates. Given that most properties are of those types, this solution works well in almost every case.
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