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Exercising IBindingList Change Notifications
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The following simple console application shows the results ofListChanged events being raised from a data view as the underlying data collection is modified in several ways class Program { static void Main(string[] args) { // Get some data to work with NorthwindDataSet nwData = new NorthwindDataSet(); CustomersTableAdapter adapter = new CustomersTableAdapter(); adapterFill(nwDataCustomers); // Get an IBindingList interface reference IBindingList list = nwDataCustomersDefaultView; // Subscribe to change events listListChanged += new ListChangedEventHandler(OnListChanged); // Delete a row listRemoveAt(1); // Add a column nwDataCustomersColumnsAdd("New Column", typeof(string)); // Change an item in the collection nwDataCustomers[0]CompanyName = "IDesign"; } static void OnListChanged(object sender, ListChangedEventArgs e) { ConsoleWriteLine("ListChangedType Value: {0}", eListChangedType); ConsoleWriteLine("NewIndex value: {0}",eNewIndex); ConsoleWriteLine("OldIndex value: {0}",eOldIndex); if (ePropertyDescriptor != null) { ConsoleWriteLine("PropertyDescriptor Name: {0}", ePropertyDescriptorName); ConsoleWriteLine("PropertyDescriptor Type: {0}", ePropertyDescriptorPropertyType); } ConsoleWriteLine(); } }
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In this code, a typed data set is created and filled with customer data An IBindingList interface reference to the default view of the Customers table is then obtained and used to subscribe to theListChanged event The collection is then modified in three ways:
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A row (a data item) is deleted from the table (the collection) A new column (property) is added to the table The value of one of the columns (properties) of a row is modified
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Running this program results in the following output: ListChangedType Value: ItemDeleted NewIndex value: 1 OldIndex value: -1 ListChangedType Value: PropertyDescriptorAdded NewIndex value: 0 OldIndex value: 0 PropertyDescriptor Name: New Column PropertyDescriptor Type: SystemString ListChangedType Value: ItemChanged NewIndex value: 0 OldIndex value: 0 PropertyDescriptor Name: CompanyName PropertyDescriptor Type: SystemString
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From this you can see that deleting items gives the deleted item's index in the NewIndex property of the event arguments; the property descriptor is returned for a new column, describing that column; and when an item in the collection changes, its index is returned, along with a property descriptor for the property that changed
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The next category of functionality specified by the IBindingList members is sorting The SupportsSorting property lets the collection specify whether it even supports sorting If it doesn't, then a bound control shouldn't even expose sorting controls to the user If the collection does support sorting, then the ApplySort and RemoveSort methods let a control invoke or remove the sorting functionality provided by the collection The ApplySort method takes two parameters: the PropertyDescriptor identifies the property on which you want to sort, and the ListSortDirection enumeration, whose value can be either Ascending or Descending The sorting support defined by the IBindingList interface only supports sorting on a single property at a time For multi-property sorts, you need to implement the IBindingListView interface, as described in the next section Listing 71 shows an example of using the IBindingList interface sorting properties and methods to sort a collection in various ways
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Listing 71 Sorting a List Through IBindingList
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class Program { static void Main(string[] args) { // Get some data to work with object dataCollection = GetData(); IBindingList list = dataCollection as IBindingList; ITypedList typedList = dataCollection as ITypedList; // Dump the raw data view DumpList(list, "Raw Data"); // Check to see if the list supports sorting
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if (listSupportsSorting) { // Get property descriptors for table PropertyDescriptorCollection props = typedListGetItemProperties(null); // Apply Sort on column 1 listApplySort(props[0], ListSortDirectionAscending); DumpList(list, "Sorted Key1 Ascending"); // Apply Sort on column 2 listApplySort(props[1], ListSortDirectionDescending); DumpList(list, "Sorted Key2 Descending"); // Remove Sort listRemoveSort(); DumpList(list, "Unsorted"); }
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} private static object GetData() { // Create a data set with some sortable sample data DataSet data = new DataSet(); // Add a table DataTable table = dataTablesAdd(); // Add two columns, Key1 and Key2 tableTableName = "TestTable"; tableColumnsAdd("Key1", typeof(string)); tableColumnsAdd("Key2", typeof(int)); // Add some data rows tableRowsAdd("NET", 2005); // Row 1 tableRowsAdd("ZZZZ", 9999); // Row 2 tableRowsAdd("Rocks",2); // Row 3 return dataTables[0]DefaultView; } private static void DumpList(IBindingList list, string prompt) { ConsoleWriteLine(prompt); // Loop through each data item without knowing its type // Use a type descriptor to obtain the property descriptors PropertyDescriptorCollection props = TypeDescriptorGetProperties(list[0]); foreach (object dataobject in list) { StringBuilder builder = new StringBuilder(); // Loop through the properties, outputting name // and value for this data object foreach (PropertyDescriptor prop in props) { builderAppend(propName); builderAppend(" = "); builderAppend(propGetValue(dataobject)ToString()); builderAppend("; "); } // Write it out to screen ConsoleWriteLine(builderToString()); } ConsoleWriteLine(); }
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The code in Listing 71 first constructs a simple data set on the fly to work against and then returns the table's default view as the data collection The DataView class implements both IBindingList and ITypedList, which lets us dynamically determine the data collection's behavior and content Obviously, in production code you should check the cast's results to see if it succeeded and do something appropriate if it doesn't succeed After obtaining the interface references to the data collection, the code first calls the DumpList helper method to output the list's contents before any sorting has been applied The DumpList method uses the TypeDescriptor class (described earlier in this chapter) to obtain the collection of property descriptors for one of the data items in the collection Usually the lists you deal with will be homogeneous collections of objects; otherwise, you aren't likely to be able to data bind with them in the first place As a result, you only need to obtain the property descriptors once using one of the objects in the collection Using those property descriptors, the consuming code can output the name and value of each data object as it iterates over the list with a foreach loop (which is enabled by the base interfaceIEnumerable) Note that this method has no specific type information about the list or its data items, other than that the collection is represented by an interface reference of type IBindingList After the raw list is dumped, the code uses the IBindingList reference to see if the collection supports sorting If so, the sample enters the block of code that applies sorts The code first uses the ITypedList interface reference to get the property descriptors for the data view's columns through the GetItemProperties method It then uses the property descriptors for the first and second columns to apply an ascending and descending sort on each one, respectively After applying each sort, it calls DumpList again to show that the list's iteration order has in fact changed to reflect the sort Finally, it calls RemoveSort to show that the list order is restored to its original order If you run this sample, you will see the following results of sorting in the output: Raw Data Key1 = NET; Key2 = 2005; Key1 = ZZZZ; Key2 = 9999; Key1 = Rocks; Key2 = 2; Sorted Key1 Ascending Key1 = NET; Key2 = 2005; Key1 = Rocks; Key2 = 2; Key1 = ZZZZ; Key2 = 9999; Sorted Key2 Descending Key1 = ZZZZ; Key2 = 9999; Key1 = NET; Key2 = 2005; Key1 = Rocks; Key2 = 2; Unsorted Key1 = NET; Key2 = 2005; Key1 = ZZZZ; Key2 = 9999; Key1 = Rocks; Key2 = 2;
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This example demonstrates that sorting should modify the order that the list returns items when it is iterated over If you are creating your own object collection type, how you apply sorting is up to you, but it is usually nontrivial to support sorting effectively The RemoveSort method removes just the current sort You can check whether a collection is sorted using the IsSorted property You can also obtain the sort direction and property with the SortDirection and SortProperty properties, respectively, on the binding list There are a couple of important things to note from this example The first is that this is a good example of the power of the data-binding interfaces Once the data collection is constructed by the helper method, the main part of the code has no specific type information about the collection or the data items it is working on Yet the sample code is able to iterate over the data, output the data, and modify the sorting of the data all based on the various data-binding interfaces This is what you want, because in data-binding situations you are going to be given an object reference for a collection, and you have to take it from there without knowing or assuming any specific type information other than the data-binding interfaces The way you will typically do that is to try to cast to the various data-binding interface types, and if the cast succeeds, then you can count on using the behavior defined on that interface If the cast fails, then you will have do
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