hashtableexample.cs

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using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace HashtableExample
{
	/// <summary>
	/// Form1 的摘要说明。
	/// </summary>
	public class HashtableExample : System.Windows.Forms.Form
	{
		private System.Windows.Forms.Label lblKey;
		private System.Windows.Forms.Label lblValue;
		private System.Windows.Forms.TextBox txtKey;
		private System.Windows.Forms.TextBox txtValue;
		private System.Windows.Forms.Button btnAdd;
		private System.Windows.Forms.TextBox txtSelectedValue;
		private System.Windows.Forms.Label lblAddedKey;
		private System.Windows.Forms.Label lblSeletedValue;
		private System.Windows.Forms.GroupBox grpAddKey;
		private System.Windows.Forms.ListBox lstAddedKey;
		
		private Hashtable _hashtable = new Hashtable();
		
		/// <summary>
		/// 必需的设计器变量。
		/// </summary>
		private System.ComponentModel.Container components = null;

		public HashtableExample()
		{
			//
			// Windows 窗体设计器支持所必需的
			//
			InitializeComponent();

			//
			// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
			//
		}

		/// <summary>
		/// 清理所有正在使用的资源。
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if( disposing )
			{
				if (components != null) 
				{
					components.Dispose();
				}
			}
			base.Dispose( disposing );
		}

		#region Windows 窗体设计器生成的代码
		/// <summary>
		/// 设计器支持所需的方法 - 不要使用代码编辑器修改
		/// 此方法的内容。
		/// </summary>
		private void InitializeComponent()
		{
			this.lblKey = new System.Windows.Forms.Label();
			this.lblValue = new System.Windows.Forms.Label();
			this.txtKey = new System.Windows.Forms.TextBox();
			this.txtValue = new System.Windows.Forms.TextBox();
			this.btnAdd = new System.Windows.Forms.Button();
			this.txtSelectedValue = new System.Windows.Forms.TextBox();
			this.lblAddedKey = new System.Windows.Forms.Label();
			this.lblSeletedValue = new System.Windows.Forms.Label();
			this.grpAddKey = new System.Windows.Forms.GroupBox();
			this.lstAddedKey = new System.Windows.Forms.ListBox();
			this.grpAddKey.SuspendLayout();
			this.SuspendLayout();
			// 
			// lblKey
			// 
			this.lblKey.Location = new System.Drawing.Point(8, 16);
			this.lblKey.Name = "lblKey";
			this.lblKey.TabIndex = 0;
			this.lblKey.Text = "键：";
			this.lblKey.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
			// 
			// lblValue
			// 
			this.lblValue.Location = new System.Drawing.Point(8, 48);
			this.lblValue.Name = "lblValue";
			this.lblValue.TabIndex = 1;
			this.lblValue.Text = "值：";
			this.lblValue.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
			// 
			// txtKey
			// 
			this.txtKey.Location = new System.Drawing.Point(112, 16);
			this.txtKey.Name = "txtKey";
			this.txtKey.Size = new System.Drawing.Size(240, 21);
			this.txtKey.TabIndex = 2;
			this.txtKey.Text = "";
			// 
			// txtValue
			// 
			this.txtValue.Location = new System.Drawing.Point(112, 48);
			this.txtValue.Name = "txtValue";
			this.txtValue.Size = new System.Drawing.Size(240, 21);
			this.txtValue.TabIndex = 3;
			this.txtValue.Text = "";
			// 
			// btnAdd
			// 
			this.btnAdd.Font = new System.Drawing.Font("Tahoma", 8F);
			this.btnAdd.Location = new System.Drawing.Point(112, 72);
			this.btnAdd.Name = "btnAdd";
			this.btnAdd.Size = new System.Drawing.Size(75, 21);
			this.btnAdd.TabIndex = 4;
			this.btnAdd.Text = "添加";
			this.btnAdd.Click += new System.EventHandler(this.btnAdd_Click);
			// 
			// txtSelectedValue
			// 
			this.txtSelectedValue.Location = new System.Drawing.Point(112, 288);
			this.txtSelectedValue.Name = "txtSelectedValue";
			this.txtSelectedValue.Size = new System.Drawing.Size(240, 21);
			this.txtSelectedValue.TabIndex = 6;
			this.txtSelectedValue.Text = "";
			// 
			// lblAddedKey
			// 
			this.lblAddedKey.Location = new System.Drawing.Point(0, 112);
			this.lblAddedKey.Name = "lblAddedKey";
			this.lblAddedKey.TabIndex = 7;
			this.lblAddedKey.Text = "已添加键：";
			this.lblAddedKey.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
			// 
			// lblSeletedValue
			// 
			this.lblSeletedValue.Location = new System.Drawing.Point(8, 288);
			this.lblSeletedValue.Name = "lblSeletedValue";
			this.lblSeletedValue.TabIndex = 8;
			this.lblSeletedValue.Text = "选中键的值：";
			this.lblSeletedValue.TextAlign = System.Drawing.ContentAlignment.MiddleLeft;
			// 
			// grpAddKey
			// 
			this.grpAddKey.Controls.Add(this.txtValue);
			this.grpAddKey.Controls.Add(this.lblKey);
			this.grpAddKey.Controls.Add(this.txtKey);
			this.grpAddKey.Controls.Add(this.lblValue);
			this.grpAddKey.Controls.Add(this.btnAdd);
			this.grpAddKey.Dock = System.Windows.Forms.DockStyle.Top;
			this.grpAddKey.Location = new System.Drawing.Point(0, 0);
			this.grpAddKey.Name = "grpAddKey";
			this.grpAddKey.Size = new System.Drawing.Size(368, 100);
			this.grpAddKey.TabIndex = 9;
			this.grpAddKey.TabStop = false;
			this.grpAddKey.Text = "建立键值";
			// 
			// lstAddedKey
			// 
			this.lstAddedKey.ItemHeight = 12;
			this.lstAddedKey.Location = new System.Drawing.Point(112, 112);
			this.lstAddedKey.Name = "lstAddedKey";
			this.lstAddedKey.Size = new System.Drawing.Size(240, 160);
			this.lstAddedKey.TabIndex = 10;
			this.lstAddedKey.SelectedIndexChanged += new System.EventHandler(this.lstAddedKey_SelectedIndexChanged);
			// 
			// HashtableExample
			// 
			this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
			this.ClientSize = new System.Drawing.Size(368, 333);
			this.Controls.Add(this.lstAddedKey);
			this.Controls.Add(this.grpAddKey);
			this.Controls.Add(this.lblSeletedValue);
			this.Controls.Add(this.lblAddedKey);
			this.Controls.Add(this.txtSelectedValue);
			this.Name = "HashtableExample";
			this.Text = "HashtableExample";
			this.grpAddKey.ResumeLayout(false);
			this.ResumeLayout(false);

		}
		#endregion

		/// <summary>
		/// 应用程序的主入口点。
		/// </summary>
		[STAThread]
		static void Main() 
		{
			Application.Run(new HashtableExample());
		}

		private void btnAdd_Click(object sender, System.EventArgs e)
		{
			try
			{
				_hashtable.Add(txtKey.Text, txtValue.Text);
			}
			catch(ArgumentException)
			{
				MessageBox.Show("不能添加重复的键"
					,"错误"
					,System.Windows.Forms.MessageBoxButtons.OK
					,System.Windows.Forms.MessageBoxIcon.Information);	//有重复的键值
				return;													//给用户提示，插入动作终止
			}
			catch(Exception)
			{
				MessageBox.Show("产生系统错误。");	//产生位置错误,
				Application.Exit();					//则关闭应用程序
			}
			
			lstAddedKey.Items.Add(txtKey.Text);
			
		}

		private void lstAddedKey_SelectedIndexChanged(object sender, System.EventArgs e)
		{
			string selectedKey = lstAddedKey.SelectedValue.ToString();
			string selectedValue = (string)_hashtable[selectedKey];
			txtSelectedValue.Text = selectedValue;
		}
	}
}