c# barcode generator code 39 11: The Future of Design Patterns in Visual C#

Printing Code 39 Full ASCII in Visual C# 11: The Future of Design Patterns

11: The Future of Design Patterns
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Pluggable Adapter Pattern Example Code CoolBook
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See the following code for an example of the Pluggable Adapter Pattern:
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using using using using using System; System.Collections.Generic; System.Windows.Forms; System.Drawing; System.Threading; Aug 2007
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// Adapter Pattern Example Judith Bishop // Sets up a CoolBook // This is D-J's as changed for the book class AdapterPattern { // class SpaceBookSystem {
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public delegate void InputEventHandler(object sender, EventArgs e, string s); // Adapter public class MyCoolBook : MyOpenBook { static SortedList<string, MyCoolBook> community = new SortedList<string, MyCoolBook>(100); Interact visuals; public MyCoolBook(string name) : base(name) { // Create interact on the relevant thread, and start it! new Thread(delegate( ) { visuals = new Interact("CoolBook Beta"); visuals.InputEvent += new InputEventHandler(OnInput); visuals.FormClosed += new FormClosedEventHandler(OnFormClosed); Application.Run(visuals); }).Start( ); community[name] = this;
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while (visuals == null) { Application.DoEvents( ); Thread.Sleep(100); } Add("Welcome to CoolBook " + Name); } private void OnFormClosed(object sender, FormClosedEventArgs e) { community.Remove(Name); } private void OnInput(object sender, EventArgs e, string s) { Add("\r\n"); Add(s, "Poked you"); } public new void Poke(string who) { Add("\r\n"); if (community.ContainsKey(who)) community[who].Add(Name, "Poked you"); else Add("Friend " + who + " is not part of the community"); } public new void Add(string message) { visuals.Output(message); } public new void Add(string friend, string message) { if (community.ContainsKey(friend)) community[friend].Add(Name + " : " + message); else Add("Friend " + friend + " is not part of the community"); } } // New implementation (Adaptee) public class Interact : Form { public TextBox Wall { get; set; } public Button Poke { get; set; } public Interact( ) { } public Interact(string title) { Control.CheckForIllegalCrossThreadCalls = true; Poke = new Button( ); Poke.Text = "Poke"; this.Controls.Add(Poke); Poke.Click += new EventHandler(Input); Wall = new TextBox( ); Wall.Multiline = true; Wall.Location = new Point(0, 30); Wall.Width = 300;
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Appendix
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Wall.Height = 200; Wall.AcceptsReturn = true; this.Text = title; this.Controls.Add(Wall); } public event InputEventHandler InputEvent; public void Input(object source, EventArgs e) { string who = Wall.SelectedText; if (InputEvent != null) InputEvent(this, EventArgs.Empty, who); } public void Output(string message) { if (this.InvokeRequired) this.Invoke((MethodInvoker)delegate( ) { Output(message); }); else { Wall.AppendText(message + "\r\n"); this.Show( ); } } protected override void OnFormClosed(FormClosedEventArgs e) { // Remove the interact and CoolBook from the community here! base.OnFormClosed(e); } } // The RealSubject (Proxy pattern) // CANNOT CHANGE public class SpaceBook { static SortedList<string, SpaceBook> community = new SortedList<string, SpaceBook>(100); string pages; string name; string gap = "\n\t\t\t\t"; static public bool Unique(string name) { return community.ContainsKey(name); } internal SpaceBook(string n) { name = n; community[n] = this; } internal string Add(string s) { pages += gap + s; return gap + "======== " + name + "'s SpaceBook =========\n" + pages + gap + "\n==================================="; }
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internal string Add(string friend, string message) { return community[friend].Add(message); } internal void Poke(string who, string friend) { community[who].pages += gap + friend + " poked you"; } } // Target (Adapter pattern) // CANNOT CHANGE public class MyOpenBook { SpaceBook myOpenBook; public string Name { get; set; } public static int Users { get; set; } public MyOpenBook(string n) { Name = n; Users++; myOpenBook = new SpaceBook(Name + "-" + Users); } public void Add(string message) { Console.WriteLine(myOpenBook.Add(message)); } public void Add(string friend, string message) { Console.WriteLine(myOpenBook.Add(friend, Name + " : " + message)); } public void Poke(string who) { myOpenBook.Poke(who, Name); } public void SuperPoke(string who, string what) { myOpenBook.Add(who, what + " you"); } } // } // The Client static void Main( ) { MyCoolBook judith = new MyCoolBook("Judith"); judith.Add("Hello world"); MyCoolBook tom = new MyCoolBook("Tom"); tom.Poke("Judith"); tom.Add("Hey, We are on CoolBook"); judith.Poke("Tom"); Console.ReadLine( ); } }
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Appendix
Prototype Pattern Example Code Photo Archive
See the following code for an example of the Prototype Pattern:
Here is an using System; using System.Collections.Generic; using System.IO; using PrototypePattern; namespace CompositePattern { // The Composite Pattern namespace // including the Share operations // The Interface public interface IComponent <T> { void Add(IComponent <T> c); IComponent <T> Remove(T s); string Display(int depth); IComponent <T> Find(T s); IComponent <T> Share (T s,IComponent <T> home); string Name {get; set;} } // The Composite [Serializable( )] public class Composite <T> : IPrototype <IComponent <T>>, IComponent List <IComponent <T>> list; public string Name {get; set;} public Composite (string name) { Name = name; list = new List <IComponent <T>> ( ); } public void Add(IComponent list.Add(c); } <T> c) {
<T> {
// Finds the item from a particular point in the structure // and returns the composite from which it was removed // If not found, return the point as given public IComponent <T> Remove(T s) { holder = this; IComponent <T> p = holder.Find(s); if (holder!=null) { (holder as Composite<T>).list.Remove(p); return holder; } else return this; } IComponent <T> holder=null;
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