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s Ideally, you ll avoid the third scenario. The CollectionView offers poor performance for large items and Tip

If you wish to examine how to implement general assemblies using each of these alternatives, check out Distributed .NET Programming in VB .NET by Tom Barnaby (Apress, 2002).

operations that modify the data source (such as insertions and deletions). As you learned in 16, if you re not binding to an ADO.NET data object, it s almost always easiest to use the ObservableCollection class (or derive a custom class from ObservableCollection).

There is nothing more satisfying than building a distributed application using a new platform. To illustrate how quickly you re able to get up and running with the .NET remoting layer, let s build a simple example. As mentioned, the entirety of this example consists of three .NET assemblies: A general assembly named SimpleRemotingAsm.dll A client assembly named SimpleRemoteObjectClient.exe A server assembly named SimpleRemoteObjectServer.exe

Figure 1-1. Selecting the New Project Wizard On the Create a Java Project screen, specify a project name, such as 1. In the Project Layout section, select Create Separate Source and Output Folders, and click Next, as shown in Figure 1-2.

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To get ahold of a view object that s currently in use, you use the shared GetDefaultView() method of the System.Windows.Data.CollectionViewSource class. When you call GetDefaultView(), you pass in the data source the collection or DataTable that you re using. Here s an example that gets the view for the collection of products that s bound to the list: Dim view As ICollectionView view = CollectionViewSource.GetDefaultView(lstProducts.ItemsSource) The GetDefaultView() method always returns an ICollectionView reference. It s up to you to cast the view object to the appropriate class, such as a ListCollectionView or BindingListCollectionView, depending on the data source. Dim view As ListCollectionView = _ CType(CollectionViewSource.GetDefaultView(lstProducts.ItemsSource), _ ListCollectionView) In the following sections, you ll learn how to use the view object to add filtering, sorting, and grouping.

First, let s create the general assembly, SimpleRemotingAsm.dll, which will be referenced by both the server and client applications. SimpleRemotingAsm.dll defines a single MBR type named RemoteMessageObject, which supports two public members. The DisplayMessage() method prints a client-supplied message on the server s console window, while ReturnMessage() returns a message to the client. Here is the complete code of this new VB 2005 class library: ' This is a type that will be ' marshaled by reference (MBR) if accessed remotely. Public Class RemoteMessageObject Inherits MarshalByRefObject Public Sub New() Console.WriteLine("Constructing RemoteMessageObject!") End Sub ' This method takes an input string ' from the caller. Public Sub DisplayMessage(ByVal msg As String)

Filtering allows you to show a subset of records that meet specific conditions. When working with a collection as a data source, you set the filter using the Filter property of the view object. The implementation of the Filter property is a little awkward. It accepts a Predicate delegate that points to a custom filtering method (that you create). Here s an example of how you can connect a view to a method named FilterProduct(): Dim view As ListCollectionView = _ CType(CollectionViewSource.GetDefaultView(lstProducts.ItemsSource), _ ListCollectionView) view.Filter = New Predicate(Of object)(FilterProduct) The filtering examines a single data item from the collection and returns True if it should be allowed in the list or False if it should be excluded. When you create the Predicate object, you specify the type of object that it s meant to examine. The awkward part is that the view expects you to use a Predicate<object> instance you can t use something more useful (such as Predicate<Product>) to save yourself the type casting code. Here s a simple method that shows products only if they exceed $100: Public Function FilterProduct(ByVal item As Object) As Boolean Dim product As Product = CType(item, Product)

At this point, you can either run your program by double-clicking the executable using Windows Explorer or leverage the Tools Run menu option to specify myApp.exe as the current command (see Figure 2-6).

Return product.UnitCost > 100 End Function Obviously, it makes little sense to hard-code values in your filter condition. A more realistic application would filter dynamically based on other information, like the user-supplied criteria shown in Figure 17-11.

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