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An implementation of Command pattern in C#

, 3 Nov 2010
.NET delegates and Generics allow for an elegant implementation of the Command pattern.
namespace CommandDemo
{
	partial class CommandDemoForm
	{
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.IContainer components = null;

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
		protected override void Dispose(bool disposing)
		{
			if (disposing && (components != null))
			{
				components.Dispose();
			}
			base.Dispose(disposing);
		}

		#region Windows Form Designer generated code

		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			this.namesListBox = new System.Windows.Forms.ListBox();
			this.label1 = new System.Windows.Forms.Label();
			this.newNameTextBox = new System.Windows.Forms.TextBox();
			this.addButton = new System.Windows.Forms.Button();
			this.menuStrip = new System.Windows.Forms.MenuStrip();
			this.fileToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
			this.saveToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
			this.editToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
			this.undoToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
			this.redoToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
			this.menuStrip.SuspendLayout();
			this.SuspendLayout();
			// 
			// namesListBox
			// 
			this.namesListBox.Anchor = ((System.Windows.Forms.AnchorStyles)((((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Bottom)
						| System.Windows.Forms.AnchorStyles.Left)
						| System.Windows.Forms.AnchorStyles.Right)));
			this.namesListBox.FormattingEnabled = true;
			this.namesListBox.Location = new System.Drawing.Point(160, 55);
			this.namesListBox.Name = "namesListBox";
			this.namesListBox.Size = new System.Drawing.Size(120, 199);
			this.namesListBox.Sorted = true;
			this.namesListBox.TabIndex = 0;
			this.namesListBox.KeyDown += new System.Windows.Forms.KeyEventHandler(this.namesListBox_KeyDown);
			// 
			// label1
			// 
			this.label1.AutoSize = true;
			this.label1.Location = new System.Drawing.Point(157, 39);
			this.label1.Name = "label1";
			this.label1.Size = new System.Drawing.Size(40, 13);
			this.label1.TabIndex = 1;
			this.label1.Text = "Names";
			// 
			// newNameTextBox
			// 
			this.newNameTextBox.Location = new System.Drawing.Point(13, 108);
			this.newNameTextBox.Name = "newNameTextBox";
			this.newNameTextBox.Size = new System.Drawing.Size(141, 20);
			this.newNameTextBox.TabIndex = 2;
			this.newNameTextBox.TextChanged += new System.EventHandler(this.newNameTextBox_TextChanged);
			// 
			// addButton
			// 
			this.addButton.Enabled = false;
			this.addButton.Location = new System.Drawing.Point(48, 134);
			this.addButton.Name = "addButton";
			this.addButton.Size = new System.Drawing.Size(75, 23);
			this.addButton.TabIndex = 3;
			this.addButton.Text = "Add ->";
			this.addButton.UseVisualStyleBackColor = true;
			this.addButton.Click += new System.EventHandler(this.addButton_Click);
			// 
			// menuStrip
			// 
			this.menuStrip.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
            this.fileToolStripMenuItem,
            this.editToolStripMenuItem});
			this.menuStrip.Location = new System.Drawing.Point(0, 0);
			this.menuStrip.Name = "menuStrip";
			this.menuStrip.Size = new System.Drawing.Size(292, 24);
			this.menuStrip.TabIndex = 4;
			this.menuStrip.Text = "menuStrip1";
			// 
			// fileToolStripMenuItem
			// 
			this.fileToolStripMenuItem.DropDownItems.AddRange(new System.Windows.Forms.ToolStripItem[] {
            this.saveToolStripMenuItem});
			this.fileToolStripMenuItem.Name = "fileToolStripMenuItem";
			this.fileToolStripMenuItem.Size = new System.Drawing.Size(35, 20);
			this.fileToolStripMenuItem.Text = "File";
			// 
			// saveToolStripMenuItem
			// 
			this.saveToolStripMenuItem.Name = "saveToolStripMenuItem";
			this.saveToolStripMenuItem.Size = new System.Drawing.Size(109, 22);
			this.saveToolStripMenuItem.Text = "Save";
			this.saveToolStripMenuItem.Click += new System.EventHandler(this.saveToolStripMenuItem_Click);
			// 
			// editToolStripMenuItem
			// 
			this.editToolStripMenuItem.DropDownItems.AddRange(new System.Windows.Forms.ToolStripItem[] {
            this.undoToolStripMenuItem,
            this.redoToolStripMenuItem});
			this.editToolStripMenuItem.Name = "editToolStripMenuItem";
			this.editToolStripMenuItem.Size = new System.Drawing.Size(37, 20);
			this.editToolStripMenuItem.Text = "Edit";
			this.editToolStripMenuItem.DropDownOpening += new System.EventHandler(this.editToolStripMenuItem_DropDownOpening);
			// 
			// undoToolStripMenuItem
			// 
			this.undoToolStripMenuItem.Name = "undoToolStripMenuItem";
			this.undoToolStripMenuItem.Size = new System.Drawing.Size(152, 22);
			this.undoToolStripMenuItem.Text = "Undo";
			this.undoToolStripMenuItem.Click += new System.EventHandler(this.undoToolStripMenuItem_Click);
			// 
			// redoToolStripMenuItem
			// 
			this.redoToolStripMenuItem.Name = "redoToolStripMenuItem";
			this.redoToolStripMenuItem.Size = new System.Drawing.Size(152, 22);
			this.redoToolStripMenuItem.Text = "Redo";
			this.redoToolStripMenuItem.Click += new System.EventHandler(this.redoToolStripMenuItem_Click);
			// 
			// CommandDemoForm
			// 
			this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
			this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
			this.ClientSize = new System.Drawing.Size(292, 266);
			this.Controls.Add(this.addButton);
			this.Controls.Add(this.newNameTextBox);
			this.Controls.Add(this.label1);
			this.Controls.Add(this.namesListBox);
			this.Controls.Add(this.menuStrip);
			this.MainMenuStrip = this.menuStrip;
			this.Name = "CommandDemoForm";
			this.Text = "Command Demo";
			this.FormClosing += new System.Windows.Forms.FormClosingEventHandler(this.CommandDemoForm_FormClosing);
			this.menuStrip.ResumeLayout(false);
			this.menuStrip.PerformLayout();
			this.ResumeLayout(false);
			this.PerformLayout();

		}

		#endregion

		private System.Windows.Forms.ListBox namesListBox;
		private System.Windows.Forms.Label label1;
		private System.Windows.Forms.TextBox newNameTextBox;
		private System.Windows.Forms.Button addButton;
		private System.Windows.Forms.MenuStrip menuStrip;
		private System.Windows.Forms.ToolStripMenuItem fileToolStripMenuItem;
		private System.Windows.Forms.ToolStripMenuItem saveToolStripMenuItem;
		private System.Windows.Forms.ToolStripMenuItem editToolStripMenuItem;
		private System.Windows.Forms.ToolStripMenuItem undoToolStripMenuItem;
		private System.Windows.Forms.ToolStripMenuItem redoToolStripMenuItem;
	}
}

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About the Author

Dave Midgley
Software Developer
United Kingdom United Kingdom
After acquiring a degree in Electronic Engineering and Physics from Loughborough University, I moved into software engineering. In 1991 I went freelance and have been contracting ever since. I live in the North West of England and spend most of my spare time on the stage, or in Africa. If you like the code in my articles please feel free to offer me a job. If you would like to support my work with Project African Wilderness in Malawi please go to www.ProjectAfricanWilderness.org

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Web03 | 2.8.140827.1 | Last Updated 3 Nov 2010
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