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Mapping Text to Enum entries

, 6 Jun 2003
Attaching a description to each entry in an enum.
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Reflection;

namespace EnumWithDescription
{
	/// <summary>
	/// Summary description for Form1.
	/// </summary>
	public class FormTest : System.Windows.Forms.Form
	{
		private System.Windows.Forms.ListView listView;
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.Container components = null;

		public FormTest()
		{
			//
			// Required for Windows Form Designer support
			//
			InitializeComponent();

			//
			// TODO: Add any constructor code after InitializeComponent call
			//
		}

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (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.listView = new System.Windows.Forms.ListView();
			this.SuspendLayout();
			// 
			// listView
			// 
			this.listView.Dock = System.Windows.Forms.DockStyle.Fill;
			this.listView.Font = new System.Drawing.Font("Courier New", 8.139131F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(0)));
			this.listView.Name = "listView";
			this.listView.Size = new System.Drawing.Size(464, 138);
			this.listView.TabIndex = 0;
			// 
			// FormTest
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 15);
			this.ClientSize = new System.Drawing.Size(464, 138);
			this.Controls.AddRange(new System.Windows.Forms.Control[] {
																		  this.listView});
			this.Name = "FormTest";
			this.Text = "Enum with Description";
			this.Load += new System.EventHandler(this.FormTest_Load);
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new FormTest());
		}


		private enum MyColors
		{
			[Description("yuk!")]       LightGreen    = 0x012020,
			[Description("nice :-)")]   VeryDeepPink  = 0x123456,
			[Description("so what")]    InvisibleGray = 0x456730,
			[Description("no comment")] DeepestRed    = 0xfafafa,
			[Description("I give up")]  PitchBlack    = 0xffffff,
		}

		private void FormTest_Load(object sender, System.EventArgs e)
		{
			listView.View=View.Details;

			listView.Columns.Add("Name"       , listView.ClientSize.Width/4, HorizontalAlignment.Left);
			listView.Columns.Add("Value"      , listView.ClientSize.Width/4, HorizontalAlignment.Right);
			listView.Columns.Add("Description", listView.ClientSize.Width/2, HorizontalAlignment.Left);

			foreach (MyColors color in Enum.GetValues(typeof(MyColors))) 
			{
				ListViewItem item = new ListViewItem(color.ToString());
				item.SubItems.Add(string.Format("0x{0:x6}", (int)color));
				item.SubItems.Add(GetDescription(color));
				listView.Items.Add(item);
			}

		}

		public static string GetDescription(Enum value)
		{
			FieldInfo fi=value.GetType().GetField(value.ToString());
			DescriptionAttribute[] attributes = (DescriptionAttribute[]) fi.GetCustomAttributes(typeof(DescriptionAttribute), false);
			return (attributes.Length>0)?attributes[0].Description:value.ToString();
		}
	}
}

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About the Author

Reto Ravasio
Switzerland Switzerland
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