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Item = "Clothing", Amount = 200 }); this.Add(new Spending { ParentCollection = this, ID = 4, Item = "Transportation", Amount = 75 }); this.Add(new Spending { ParentCollection = this, ID = 5, Item = "Mortgage", Amount = 3000 }); this.Add(new Spending { ParentCollection = this, ID = 6, Item = "Education", Amount = 500 }); this.Add(new Spending { ParentCollection = this, ID = 7, Item = "Entertainment", Amount = 125 }); this.Add(new Spending { ParentCollection = this, ID = 8, Item = "Loans", Amount = 750 }); this.Add(new Spending { ParentCollection = this, ID = 9, Item = "Medical", Amount = 80 });

ZK is a component-based graphical user interface (GUI) toolkit. ZK provides more than 70 XUL-based and 80 XHTML-based components, and it provides the ZUML markup language for designing user interfaces. Programmers design their application pages in feature-rich XUL/XHTML components, which manipulate applications upon events triggered by the end user s activity. It is similar to the programming model found in desktop GUI-based applications.

this.Add(new Spending { ParentCollection = this, ID = 10, Item = "Miscellaneous", Amount = 175 }); } public double Total { get { return this.Sum(spending => spending.Amount); } } } [DataContract] public class Spending : INotifyPropertyChanged { public event PropertyChangedEventHandler PropertyChanged; internal void RaisePropertyChanged(PropertyChangedEventArgs e) { if (PropertyChanged != null) { PropertyChanged(this, e); } } public override int GetHashCode() { return ID.GetHashCode(); } public override bool Equals(object obj) { return (obj is Spending) this.ID.Equals((obj as Spending).ID) : false; } SpendingCollection _ParentCollection = null; public SpendingCollection ParentCollection {

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get { return _ParentCollection; } set { _ParentCollection = value; if (ParentCollection != null) { foreach (Spending sp in ParentCollection) sp.RaisePropertyChanged(new PropertyChangedEventArgs("Amount")); } } } private int _ID = default(int); [DataMember] public int ID { get { return _ID; } set { if (value != _ID) { _ID = value; if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs("ID")); } } } private string _Item; [DataMember] public string Item { get { return _Item; } set { string OldVal = _Item; if (OldVal != value) { _Item = value; RaisePropertyChanged(new PropertyChangedEventArgs("Item"));

} } } private double _Amount; [DataMember] public double Amount { get { return _Amount; } set { double OldVal = _Amount; if (OldVal != value) { _Amount = value; if (ParentCollection != null) { foreach (Spending sp in ParentCollection) sp.RaisePropertyChanged(new PropertyChangedEventArgs("Amount")); } } } } } } The only changes worth noting are the addition of an ID property to the Spending class to uniquely identify it in a collection, and the overrides for GetHashCode() and Equals() to facilitate locating or comparing spending instances based on their IDs. The changes are noted in bold in Listing 7-32. Now, let s look at the application code. Listing 7-33 lists the codebehind for the worksheet application. Listing 7-33. The MainPage codebehind in MainPage.xaml.cs for the HomeExpenseWorksheet application using using using using using using System; System.Collections.Generic; System.Windows; System.Windows.Controls; System.Windows.Messaging; Recipe7_7.SD;

namespace Recipe7_7.HomeExpenseWorksheet { public partial class MainPage : UserControl {

Summary

//data source SpendingCollection SpendingList = new SpendingCollection(); //create a sender LocalMessageSender WorksheetSender = new LocalMessageSender("SpendingGraph", LocalMessageSender.Global); //create a receiver LocalMessageReceiver WorksheetReceiver = new LocalMessageReceiver("SpendingWorksheet", ReceiverNameScope.Global, LocalMessageReceiver.AnyDomain); public MainPage() { InitializeComponent(); //bind data dgSpending.ItemsSource = SpendingList; //handle message receipt WorksheetReceiver.MessageReceived+= new EventHandler<MessageReceivedEventArgs>((s,e) => { //deserialize message Message Msg = Message.Deserialize(e.Message); //if item value changed if (Msg.MsgType == MessageType.ItemsValueChanged) { //for each item for which value has changed foreach (Spending sp in Msg.Items) { //find the corrsponding item in the data source and replace value SpendingList[SpendingList.IndexOf(sp)] = sp; } } }); //handle send completion WorksheetSender.SendCompleted += new EventHandler<SendCompletedEventArgs>((s, e) => { //if error if (e.Error != null) { //we had an error sending the message - do some error reporting here }

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