Command Pattern | in C#

Creator Code39 in C# Command Pattern |

Command Pattern |
Making ANSI/AIM Code 39 In C#.NET
Using Barcode generation for Visual Studio .NET Control to generate, create ANSI/AIM Code 39 image in .NET applications.
www.OnBarcode.com
Recognizing Code 3 Of 9 In C#.NET
Using Barcode decoder for .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
Multireceiver commands
Barcode Drawer In Visual C#.NET
Using Barcode creation for .NET framework Control to generate, create Barcode image in VS .NET applications.
www.OnBarcode.com
GS1 - 13 Printer In C#.NET
Using Barcode printer for Visual Studio .NET Control to generate, create EAN13 image in Visual Studio .NET applications.
www.OnBarcode.com
What would happen if we had more than one delegate type in the same program, and also more than one receiver First of all, the names of the delegate types (Invokers) would be different. The Command objects can configure the matches between the delegate objects and different Receiver methods as required. In the following program, there are two Command classes and two Receivers. Because both Commands use the same delegate objects (Invokers), the Client executes commands first in one Receiver and then in the other; however, that might be an unnecessary constraint. To overcome it, we can either introduce more delegate objects or group them inside the Commands, as shown in the next example. The multireceiver version of the Command pattern in Example 8-4 illustrates in addition how to handle commands that cannot be associated with anything meaningful in a given Receiver, as shown for the second Command (lines 25 32). Undo is not allowed for this Execute command, so we assign an anonymous delegate to the delegate object that writes out an error message (line 30). Note that the writing is not done when the association is made, but only when (and if) the Client calls Undo.
UPC-A Supplement 2 Drawer In Visual C#
Using Barcode drawer for .NET framework Control to generate, create UPC Code image in Visual Studio .NET applications.
www.OnBarcode.com
Printing Code39 In Visual C#.NET
Using Barcode generator for .NET framework Control to generate, create Code39 image in Visual Studio .NET applications.
www.OnBarcode.com
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 using System; class CommandPattern { // Command Pattern Multireceiver Version Judith Bishop // Has two different delegates for two types of commands // The second receiver uses both of them delegate void Invoker ( ); delegate void InvokerSet (string s); static Invoker Execute, Redo, Undo; static InvokerSet Set; class Command { public Command(Receiver receiver) { Set = delegate {Console.WriteLine("Not implemented - default of XXX used"); receiver.S = "XXX";}; Execute= receiver.Action; Redo = receiver.Action; Undo = receiver.Reverse; } } class Command2 { public Command2(Receiver2 receiver) { Set = receiver.SetData; Execute= receiver.DoIt; Redo = receiver.DoIt; Undo = delegate {Console.WriteLine("Not Implemented");}; June 2007
Making Matrix Barcode In Visual C#.NET
Using Barcode generation for VS .NET Control to generate, create Matrix Barcode image in Visual Studio .NET applications.
www.OnBarcode.com
UPC Case Code Printer In C#
Using Barcode printer for Visual Studio .NET Control to generate, create DUN - 14 image in .NET applications.
www.OnBarcode.com
|
Drawing Code 39 Extended In Java
Using Barcode printer for Java Control to generate, create Code-39 image in Java applications.
www.OnBarcode.com
Code 3/9 Recognizer In VS .NET
Using Barcode scanner for .NET Control to read, scan read, scan image in Visual Studio .NET applications.
www.OnBarcode.com
8: Behavioral Patterns: Chain of Responsibility and Command
1D Barcode Encoder In VS .NET
Using Barcode maker for .NET framework Control to generate, create 1D Barcode image in VS .NET applications.
www.OnBarcode.com
Painting EAN / UCC - 13 In None
Using Barcode creator for Font Control to generate, create EAN13 image in Font applications.
www.OnBarcode.com
31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 } } public class Receiver { string build, oldbuild; string s = "some string "; public string S { get {return s;} set {s = value;} } public void Action( ) { oldbuild = build; build +=s; Console.WriteLine("Receiver is adding "+build); } public void Reverse( ) { build = oldbuild; Console.WriteLine("Receiver is reverting to "+build); } } public class Receiver2 { string build, oldbuild; string s; public void SetData(string s) { this.s = s; } public void DoIt( ) { oldbuild = build; build +=s; Console.WriteLine("Receiver is building "+build); } } class Client { public void ClientMain( ) { new Command (new Receiver( )); Execute( ); Redo( ); Undo( ); Set("III"); Execute( ); Console.WriteLine( ); new Command2 (new Receiver2( )); Set("houses "); Execute( );
PDF 417 Scanner In VB.NET
Using Barcode decoder for .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Barcode Generator In None
Using Barcode drawer for Microsoft Word Control to generate, create Barcode image in Microsoft Word applications.
www.OnBarcode.com
Command Pattern |
Code-128 Printer In Java
Using Barcode generation for Android Control to generate, create Code128 image in Android applications.
www.OnBarcode.com
GS1 - 12 Decoder In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 Set("castles "); Undo( ); Execute( ); Redo( ); } } static void Main( ) { new Client( ).ClientMain( ); } } /* Output Receiver is adding some string Receiver is adding some string some string Receiver is reverting to some string Not implemented - default of XXX used Receiver is adding some string XXX Receiver is building houses Not Implemented Receiver is building houses castles Receiver is building houses castles castles */
Creating UCC - 12 In None
Using Barcode generator for Online Control to generate, create UPC Symbol image in Online applications.
www.OnBarcode.com
Generate Code-128 In Java
Using Barcode creation for Java Control to generate, create Code 128 Code Set C image in Java applications.
www.OnBarcode.com
Printing Barcode In None
Using Barcode encoder for Excel Control to generate, create Barcode image in Excel applications.
www.OnBarcode.com
Making PDF 417 In Java
Using Barcode generator for Android Control to generate, create PDF 417 image in Android applications.
www.OnBarcode.com
Copyright © OnBarcode.com . All rights reserved.