C# CheckedListBox.CheckOnClick属性代码示例

// This method initializes CheckedListBox1 with a list of all 
// the controls on the form. It sets the selection mode
// to single selection and allows selection with a single click.
// It adds itself to the list before adding itself to the form.

internal System.Windows.Forms.CheckedListBox CheckedListBox1;

private void InitializeCheckedListBox()
{
    this.CheckedListBox1 = new CheckedListBox();
    this.CheckedListBox1.Location = new System.Drawing.Point(40, 90);
    this.CheckedListBox1.CheckOnClick = true;
    this.CheckedListBox1.Name = "CheckedListBox1";
    this.CheckedListBox1.Size = new System.Drawing.Size(120, 94);
    this.CheckedListBox1.TabIndex = 1;
    this.CheckedListBox1.SelectionMode = SelectionMode.One;
    this.CheckedListBox1.ThreeDCheckBoxes = true;

    foreach ( Control aControl in this.Controls )
    {
        this.CheckedListBox1.Items.Add(aControl, false);
    }

    this.CheckedListBox1.DisplayMember = "Name";
    this.CheckedListBox1.Items.Add(CheckedListBox1);
    this.Controls.Add(this.CheckedListBox1);
}

//引入命名空间
using System;
using System.Drawing;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;

public class CheckedListBoxes : Form
{
  CheckedListBox clb;
  Button btnToggle;
  Button btnClear;
  String str;

  public CheckedListBoxes()
  {
    Size = new Size(300,400);
    this.Load += new EventHandler(this_Load);

    clb = new CheckedListBox();
    clb.Parent = this;
    clb.Location = new Point(10,10);
    clb.Size = new Size(ClientSize.Width - 20, Height - 240);
    clb.Anchor = AnchorStyles.Top | AnchorStyles.Left | AnchorStyles.Right | AnchorStyles.Bottom;
    clb.BorderStyle = BorderStyle.Fixed3D;
    clb.MultiColumn = true;
    clb.ScrollAlwaysVisible = true;
    clb.ThreeDCheckBoxes = true;  
    clb.CheckOnClick = true;
    clb.ItemCheck += new ItemCheckEventHandler(clb_ItemCheck);

    btnToggle = new Button();
    btnToggle.Parent = this;
    btnToggle.Text = "Toggle Indeterminate";
    btnToggle.Size = new Size((int)(Font.Height * .75) * btnToggle.Text.Length, Font.Height + 10);
    btnToggle.Location = new Point( clb.Left, clb.Bottom + 10);
    btnToggle.Anchor = AnchorStyles.Left | AnchorStyles.Bottom;
    btnToggle.Click += new System.EventHandler(btnToggle_Click);

    btnClear = new Button();
    btnClear.Parent = this;
    btnClear.Text = "Clear All";
    btnClear.Size = new Size((int)(Font.Height * .75) * btnClear.Text.Length, Font.Height + 10);
    btnClear.Location = new Point(btnToggle.Left, btnToggle.Bottom + 10);
    btnClear.Anchor = AnchorStyles.Left | AnchorStyles.Bottom;
    btnClear.Click += new System.EventHandler(btnClear_Click);

    clb.Items.Add("12345");
      clb.Items.Add("67890");      
      clb.Items.Add("7890");      
      clb.Items.Add("890");            
  }  

  static void Main() 
  {
    Application.Run(new CheckedListBoxes());
  }

  private void btnToggle_Click(object sender, EventArgs e)
  {
    for (int i = 0; i <= (clb.Items.Count - 1); i++)
    {
      if (clb.GetItemCheckState(i) == CheckState.Checked)
      {
        clb.SetItemCheckState(i, CheckState.Indeterminate);  
      }
      else if (clb.GetItemCheckState(i) == CheckState.Indeterminate)
      {
        clb.SetItemCheckState(i, CheckState.Checked);  
      }
    }  
  }

  private void btnClear_Click(object sender, EventArgs e)
  {
    clb.ClearSelected();

    for (int i = 0; i <= (clb.Items.Count - 1); i++)
    {
      clb.SetItemChecked(i, false);  
    }
  }

  private void clb_ItemCheck(object sender, ItemCheckEventArgs e)
  {
    Console.WriteLine("Current Item:" + clb.GetItemText(clb.Items[e.Index]));
    Console.WriteLine("Current Index:" + e.Index.ToString() );
    Console.WriteLine("Current Value:" + e.CurrentValue.ToString() );
    Console.WriteLine("New Value:" + e.NewValue.ToString() );
  }

  private void clb_SelectedIndexChanged(object sender, EventArgs e)
  {
    Console.WriteLine("Selected Items:" + clb.SelectedItems.Count.ToString() );
    Console.WriteLine("Checked Items:" + clb.CheckedItems.Count.ToString() );
  }

  private void this_Load(object sender, EventArgs e)
  {
    clb.SelectedIndexChanged += new EventHandler(clb_SelectedIndexChanged);
  }
}