C# ListBox.Items属性代码示例

private void button1_Click(object sender, System.EventArgs e)
{
   // Create an instance of the ListBox.
   ListBox listBox1 = new ListBox();
   // Set the size and location of the ListBox.
   listBox1.Size = new System.Drawing.Size(200, 100);
   listBox1.Location = new System.Drawing.Point(10,10);
   // Add the ListBox to the form.
   this.Controls.Add(listBox1);
   // Set the ListBox to display items in multiple columns.
   listBox1.MultiColumn = true;
   // Set the selection mode to multiple and extended.
   listBox1.SelectionMode = SelectionMode.MultiExtended;
 
   // Shutdown the painting of the ListBox as items are added.
   listBox1.BeginUpdate();
   // Loop through and add 50 items to the ListBox.
   for (int x = 1; x <= 50; x++)
   {
      listBox1.Items.Add("Item " + x.ToString());
   }
   // Allow the ListBox to repaint and display the new items.
   listBox1.EndUpdate();
      
   // Select three items from the ListBox.
   listBox1.SetSelected(1, true);
   listBox1.SetSelected(3, true);
   listBox1.SetSelected(5, true);

   // Display the second selected item in the ListBox to the console.
   System.Diagnostics.Debug.WriteLine(listBox1.SelectedItems[1].ToString());
   // Display the index of the first selected item in the ListBox.
   System.Diagnostics.Debug.WriteLine(listBox1.SelectedIndices[0].ToString());             
}

//引入命名空间
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

public class Form1 : Form
{
      private System.Windows.Forms.ListBox displayListBox;
      private System.Windows.Forms.TextBox inputTextBox;
      private System.Windows.Forms.Button addButton;
      private System.Windows.Forms.Button removeButton;
      private System.Windows.Forms.Button clearButton;
      
      public Form1() {
        InitializeComponent();
    }

      private void addButton_Click( object sender, EventArgs e )
      {
        displayListBox.Items.Add( inputTextBox.Text );
        inputTextBox.Clear();
      } 
      private void removeButton_Click( object sender, EventArgs e )
      {
        if ( displayListBox.SelectedIndex != -1 )
          displayListBox.Items.RemoveAt( displayListBox.SelectedIndex );
      }

      private void clearButton_Click( object sender, EventArgs e )
      {
         displayListBox.Items.Clear();
      }

      private void InitializeComponent()
      {
         this.displayListBox = new System.Windows.Forms.ListBox();
         this.inputTextBox = new System.Windows.Forms.TextBox();
         this.addButton = new System.Windows.Forms.Button();
         this.removeButton = new System.Windows.Forms.Button();
         this.clearButton = new System.Windows.Forms.Button();
         this.SuspendLayout();
         // 
         // displayListBox
         // 
         this.displayListBox.FormattingEnabled = true;
         this.displayListBox.Location = new System.Drawing.Point(13, 12);
         this.displayListBox.Name = "displayListBox";
         this.displayListBox.Size = new System.Drawing.Size(119, 238);
         this.displayListBox.TabIndex = 0;
         // 
         // inputTextBox
         // 
         this.inputTextBox.Location = new System.Drawing.Point(149, 12);
         this.inputTextBox.Name = "inputTextBox";
         this.inputTextBox.Size = new System.Drawing.Size(100, 20);
         this.inputTextBox.TabIndex = 1;
         // 
         // addButton
         // 
         this.addButton.Location = new System.Drawing.Point(149, 56);
         this.addButton.Name = "addButton";
         this.addButton.Size = new System.Drawing.Size(100, 36);
         this.addButton.TabIndex = 2;
         this.addButton.Text = "Add";
         this.addButton.Click += new System.EventHandler(this.addButton_Click);
         // 
         // removeButton
         // 
         this.removeButton.Location = new System.Drawing.Point(149, 109);
         this.removeButton.Name = "removeButton";
         this.removeButton.Size = new System.Drawing.Size(100, 36);
         this.removeButton.TabIndex = 3;
         this.removeButton.Text = "Remove";
         this.removeButton.Click += new System.EventHandler(this.removeButton_Click);
         // 
         // clearButton
         // 
         this.clearButton.Location = new System.Drawing.Point(149, 165);
         this.clearButton.Name = "clearButton";
         this.clearButton.Size = new System.Drawing.Size(100, 36);
         this.clearButton.TabIndex = 4;
         this.clearButton.Text = "Clear";
         this.clearButton.Click += new System.EventHandler(this.clearButton_Click);
         // ListBoxTestForm
         // 
         this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
         this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
         this.ClientSize = new System.Drawing.Size(263, 268);
         this.Controls.Add(this.clearButton);
         this.Controls.Add(this.removeButton);
         this.Controls.Add(this.addButton);
         this.Controls.Add(this.inputTextBox);
         this.Controls.Add(this.displayListBox);
         this.Name = "ListBoxTestForm";
         this.Text = "ListBoxTest";
         this.ResumeLayout(false);
         this.PerformLayout();

      }

      [STAThread]
      static void Main()
      {
    Application.EnableVisualStyles();
    Application.Run(new Form1());
    }

}