.net WinForm用户控件开发--(3)可多选的下拉列表框
这一节给大家演示一个具有多选功能的下拉列表框，其实就是一个文本框和checkboxlist组合实现的用户控件，换个角度来实现自定义控件。
先来看下效果图吧，我会分几个步骤来具体讲解这个文本框的实现。
1.界面实现
我们先来看下界面效果怎样实现，然后再讲解具体的功能性实现。
先创建一个用户控件，当然是继承UserControl类，这个界面需要用到以下控件来实现
下拉按钮：是一个button控件
文本框：显示选中的内容，
多选列表框： checkboxlist
全选/取消：是两个LABEL控件
右下角的黑三角：是一个LABEL控件，可实现拉长下拉列表框.
窗体：点击下拉按钮，实际是弹出一个窗体，下拉列表框中的控件都在这个窗体中显示
首先看下下拉按钮的实现
[csharp]
/// <summary>
/// 重写BUTTON
/// </summary>
public class ButtonS : Button
{
public ButtonS()
{
//防止重绘控件出现闪烁
this.SetStyle(ControlStyles.UserPaint, true);
this.SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
}
ButtonState state;
//当按钮被按下
protected override void OnMouseDown(MouseEventArgs mevent)
{
state = ButtonState.Pushed;
base.OnMouseDown(mevent);
}
//当按钮被释放
protected override void OnMouseUp(MouseEventArgs mevent)
{
state = ButtonState.Normal;
base.OnMouseUp(mevent);
}
protected override void OnPaint(PaintEventArgs pevent)
{
base.OnPaint(pevent);
System.Windows.Forms.ControlPaint.DrawComboButton(pevent.Graphics, 0, 0, this.Width, this.Height, state);
}
}
/// <summary>
/// 重写BUTTON
/// </summary>
public class ButtonS : Button
{
public ButtonS()
{
//防止重绘控件出现闪烁
this.SetStyle(ControlStyles.UserPaint, true);
this.SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
}
ButtonState state;
//当按钮被按下
protected override void OnMouseDown(MouseEventArgs mevent)
{
state = ButtonState.Pushed;
base.OnMouseDown(mevent);
}
//当按钮被释放
protected override void OnMouseUp(MouseEventArgs mevent)
{
state = ButtonState.Normal;
base.OnMouseUp(mevent);
}
protected override void OnPaint(PaintEventArgs pevent)
{
base.OnPaint(pevent);
System.Windows.Forms.ControlPaint.DrawComboButton(pevent.Graphics, 0, 0, this.Width, this.Height, state);
}
}
接下来再看下具有拉动功能的LABEL
[csharp]
/// <summary>
/// 重写LABEL
/// </summary>
public class LabelS : Label
{
public LabelS()
{
//控件绘制的时候减少闪烁
this.SetStyle(ControlStyles.UserPaint, true);
this.SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
System.Windows.Forms.ControlPaint.DrawSizeGrip(e.Graphics, Color.Black, 1, 0, this.Size.Width, this.Size.Height);
}
}
/// <summary>
/// 重写LABEL
/// </summary>
public class LabelS : Label
{
public LabelS()
{
//控件绘制的时候减少闪烁
this.SetStyle(ControlStyles.UserPaint, true);
this.SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
System.Windows.Forms.ControlPaint.DrawSizeGrip(e.Graphics, Color.Black, 1, 0, this.Size.Width, this.Size.Height);
}
}
接下来，我们动态用代码生成这些控件，并设置控件的布局，
现在构造函数里生成这些控件，然后在用户控件的ComCheckBoxList_Layout事件里面布局这些控件，代码如下
[csharp]
/// <summary>
/// 带下拉框的用户控件
/// </summary>
public partial class ComCheckBoxList : UserControl
{
private TextBox tbSelectedValue;
private ButtonS btnSelect;//下拉箭头
private LabelS lbGrip;//此LABEL用于设置可以拖动下拉窗体变化
private CheckedListBox checkListBox;
private Label lbSelectAll;//全选
private Label lbSelectNo;//取消
private Form frmCheckList;
private Panel pnlBack;
private Panel pnlCheck;
private System.Drawing.Point DragOffset; //用于记录窗体大小变化的位置
public ComCheckBoxList()
{
InitializeComponent();
this.Name = "comBoxCheckBoxList";
this.Layout+=new LayoutEventHandler(ComCheckBoxList_Layout);
//生成控件
tbSelectedValue = new TextBox();
tbSelectedValue.ReadOnly = true;
tbSelectedValue.BorderStyle = BorderStyle.None;
//下拉箭头
this.btnSelect = new ButtonS();
btnSelect.FlatStyle = FlatStyle.Flat;
btnSelect.Click+=new EventHandler(btnSelect_Click);
//全选
this.lbSelectAll = new Label();
lbSelectAll.BackColor = Color.Transparent;
lbSelectAll.Text = "全选";
lbSelectAll.Size = new Size(40, 20);
lbSelectAll.ForeColor = Color.Blue;
lbSelectAll.Cursor = Cursors.Hand ;
lbSelectAll.TextAlign = ContentAlignment.MiddleCenter;
lbSelectAll.Click+=new EventHandler(lbSelectAll_Click);
//取消
lbSelectNo = new Label();
lbSelectNo.BackColor = Color.Transparent;
lbSelectNo.Text = "取消";
lbSelectNo.Size = new Size(40, 20);
lbSelectNo.ForeColor = Color.Blue;
lbSelectNo.Cursor = Cursors.Hand;
lbSelectNo.TextAlign = ContentAlignment.MiddleCenter;
lbSelectNo.Click+=new EventHandler(lbSelectNo_Click);
//生成checkboxlist
this.checkListBox = new CheckedListBox();
checkListBox.BorderStyle = BorderStyle.None;
checkListBox.Location = new Point(0,0);
checkListBox.CheckOnClick = true;
checkListBox.ScrollAlwaysVisible = true;
checkListBox.LostFocus +=new EventHandler(checkListBox_LostFocus);
checkListBox.ItemCheck+=new ItemCheckEventHandler(checkListBox_ItemCheck);
//窗体
frmCheckList = new Form();
frmCheckList.FormBorderStyle = FormBorderStyle.None;
frmCheckList.StartPosition = FormStartPosition.Manual;
frmCheckList.BackColor = SystemColors.Control;
frmCheckList.ShowInTaskbar = false;
//可拖动窗体大小变化的LABEL
lbGrip = new LabelS();
lbGrip.Size = new Size(9,18);
lbGrip.BackColor = Color.Transparent;
lbGrip.Cursor = Cursors.SizeNWSE;
lbGrip.MouseDown+=new MouseEventHandler(lbGrip_MouseDown);
lbGrip.MouseMove+=new MouseEventHandler(lbGrip_MouseMove);
//panel
pnlBack = new Panel();
pnlBack.BorderStyle = BorderStyle.Fixed3D;
pnlBack.BackColor = Color.White;
pnlBack.AutoScroll = false;
//
pnlCheck = new Panel();
pnlCheck.BorderStyle = BorderStyle.FixedSingle;
pnlCheck.BackColor = Color.White; ;
SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
SetStyle(ControlStyles.ResizeRedraw, true);
pnlBack.Controls.Add(tbSelectedValue);
pnlBack.Controls.Add(btnSelect);
this.Controls.Add(pnlBack);
pnlCheck.Controls.Add(checkListBox);
pnlCheck.Controls.Add(lbSelectAll);
pnlCheck.Controls.Add(lbSelectNo);
pnlCheck.Controls.Add(lbGrip);
this.frmCheckList.Controls.Add(pnlCheck);
}
private void ReloationGrip()
{
lbGrip.Top = this.frmCheckList.Height - lbGrip.Height - 1;
lbGrip.Left = this.frmCheckList.Width - lbGrip.Width - 1;
lbSelectAll.Left =5;
lbSelectAll.Top = frmCheckList.Height - lbSelectAll.Height;
lbSelectNo.Left = 50;
lbSelectNo.Top = frmCheckList.Height - lbSelectNo.Height;
}
#region 事件
//布局
private void ComCheckBoxList_Layout(object sender,LayoutEventArgs e)
{
this.Height = tbSelectedValue.Height + 6;
this.pnlBack.Size = new Size(this.Width, this.Height - 2);
//设置按钮的位置
this.btnSelect.Size = new Size(16, this.Height - 6);
btnSelect.Location = new Point(this.Width - this.btnSelect.Width - 4, 0);
this.tbSelectedValue.Location = new Point(2, 2);
this.tbSelectedValue.Width = this.Width - btnSelect.Width - 4;
checkListBox.Height =150;
//设置窗体
this.frmCheckList.Size = new Size(this.Width,this.checkListBox.Height);
this.pnlCheck.Size =frmCheckList.Size;
this.checkListBox.Width = this.frmCheckList.Width;
this.checkListBox.Height = this.frmCheckList.Height-lbSelectNo.Height;
ReloationGrip();
}
/// <summary>
/// 单价下拉框
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
public void btnSelect_Click(object sender,EventArgs e)
{
if (this.frmCheckList.Visible == false)
{
Rectangle rec = this.RectangleToScreen(this.ClientRectangle);
this.frmCheckList.Location = new Point(rec.X, rec.Y + this.pnlBack.Height);
this.frmCheckList.Show();
this.frmCheckList.BringToFront();
ReloationGrip();
}
else
this.frmCheckList.Hide();
}
//全选事件
private void lbSelectAll_Click(object sender, EventArgs e)
{
}
//取消
private void lbSelectNo_Click(object sender,EventArgs e)
{
}
private void checkListBox_LostFocus(object sender, EventArgs e)
{
//如果鼠标位置在下拉框按钮的以为地方，则隐藏下拉框
if (!this.btnSelect.RectangleToScreen(this.btnSelect.ClientRectangle).Contains(Cursor.Position))
{
frmCheckList.Hide();
}
}
private void checkListBox_ItemCheck(object sender, ItemCheckEventArgs e)
{
}
/// <summary>
/// 鼠标按下
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void lbGrip_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button==MouseButtons.Left)
{
int offsetX = System.Math.Abs(Cursor.Position.X - frmCheckList.RectangleToScreen(this.frmCheckList.ClientRectangle).Right);
int offsetY = System.Math.Abs(Cursor.Position.Y - frmCheckList.RectangleToScreen(this.frmCheckList.ClientRectangle).Bottom);
this.DragOffset = new Point(offsetX, offsetY);
}
}
/// <summary>
/// 鼠标移动
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void lbGrip_MouseMove(object sender,MouseEventArgs e)
{
if (e.Button==MouseButtons.Left)
{
//获取拉伸长度
int curWidth = Cursor.Position.X - frmCheckList.Location.X;
int curHeight = Cursor.Position.Y - frmCheckList.Location.Y;
if (curWidth<this.Width)
{
curWidth=this.Width;
}
if (curHeight<checkListBox.Height)
{
curHeight=checkListBox.Height;
}
this.frmCheckList.Size=new Size(this.Width,curHeight);
this.pnlCheck.Size=frmCheckList.Size;
this.checkListBox.Height=(this.frmCheckList.Height-lbGrip.Height)<50?50:this.frmCheckList.Height-lbGrip.Height;
ReloationGrip();
SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
SetStyle(ControlStyles.ResizeRedraw, true);
SetStyle(ControlStyles.UserPaint, true);
SetStyle(ControlStyles.AllPaintingInWmPaint, true);
}
}
#endregion
}
/// <summary>
/// 带下拉框的用户控件
/// </summary>
public partial class ComCheckBoxList : UserControl
{
private TextBox tbSelectedValue;
private ButtonS btnSelect;//下拉箭头
private LabelS lbGrip;//此LABEL用于设置可以拖动下拉窗体变化
private CheckedListBox checkListBox;
private Label lbSelectAll;//全选
private Label lbSelectNo;//取消
private Form frmCheckList;
private Panel pnlBack;
private Panel pnlCheck;
private System.Drawing.Point DragOffset; //用于记录窗体大小变化的位置
public ComCheckBoxList()
{
InitializeComponent();
this.Name = "comBoxCheckBoxList";
this.Layout+=new LayoutEventHandler(ComCheckBoxList_Layout);
//生成控件
tbSelectedValue = new TextBox();
tbSelectedValue.ReadOnly = true;
tbSelectedValue.BorderStyle = BorderStyle.None;
//下拉箭头
this.btnSelect = new ButtonS();
btnSelect.FlatStyle = FlatStyle.Flat;
btnSelect.Click+=new EventHandler(btnSelect_Click);
//全选
this.lbSelectAll = new Label();
lbSelectAll.BackColor = Color.Transparent;
lbSelectAll.Text = "全选";
lbSelectAll.Size = new Size(40, 20);
lbSelectAll.ForeColor = Color.Blue;
lbSelectAll.Cursor = Cursors.Hand ;
lbSelectAll.TextAlign = ContentAlignment.MiddleCenter;
lbSelectAll.Click+=new EventHandler(lbSelectAll_Click);
//取消
lbSelectNo = new Label();
lbSelectNo.BackColor = Color.Transparent;
lbSelectNo.Text = "取消";
lbSelectNo.Size = new Size(40, 20);
lbSelectNo.ForeColor = Color.Blue;
lbSelectNo.Cursor = Cursors.Hand;
lbSelectNo.TextAlign = ContentAlignment.MiddleCenter;
lbSelectNo.Click+=new EventHandler(lbSelectNo_Click);
//生成checkboxlist
this.checkListBox = new CheckedListBox();
checkListBox.BorderStyle = BorderStyle.None;
checkListBox.Location = new Point(0,0);
checkListBox.CheckOnClick = true;
checkListBox.ScrollAlwaysVisible = true;
checkListBox.LostFocus +=new EventHandler(checkListBox_LostFocus);
checkListBox.ItemCheck+=new ItemCheckEventHandler(checkListBox_ItemCheck);
//窗体
frmCheckList = new Form();
frmCheckList.FormBorderStyle = FormBorderStyle.None;
frmCheckList.StartPosition = FormStartPosition.Manual;
frmCheckList.BackColor = SystemColors.Control;
frmCheckList.ShowInTaskbar = false;
//可拖动窗体大小变化的LABEL
lbGrip = new LabelS();
lbGrip.Size = new Size(9,18);
lbGrip.BackColor = Color.Transparent;
lbGrip.Cursor = Cursors.SizeNWSE;
lbGrip.MouseDown+=new MouseEventHandler(lbGrip_MouseDown);
lbGrip.MouseMove+=new MouseEventHandler(lbGrip_MouseMove);
//panel
pnlBack = new Panel();
pnlBack.BorderStyle = BorderStyle.Fixed3D;
pnlBack.BackColor = Color.White;
pnlBack.AutoScroll = false;
//
pnlCheck = new Panel();
pnlCheck.BorderStyle = BorderStyle.FixedSingle;
pnlCheck.BackColor = Color.White; ;
SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
SetStyle(ControlStyles.ResizeRedraw, true);
pnlBack.Controls.Add(tbSelectedValue);
pnlBack.Controls.Add(btnSelect);
this.Controls.Add(pnlBack);
pnlCheck.Controls.Add(checkListBox);
pnlCheck.Controls.Add(lbSelectAll);
pnlCheck.Controls.Add(lbSelectNo);
pnlCheck.Controls.Add(lbGrip);
this.frmCheckList.Controls.Add(pnlCheck);
}
private void ReloationGrip()
{
lbGrip.Top = this.frmCheckList.Height - lbGrip.Height - 1;
lbGrip.Left = this.frmCheckList.Width - lbGrip.Width - 1;
lbSelectAll.Left =5;
lbSelectAll.Top = frmCheckList.Height - lbSelectAll.Height;
lbSelectNo.Left = 50;
lbSelectNo.Top = frmCheckList.Height - lbSelectNo.Height;
}
#region 事件
//布局
private void ComCheckBoxList_Layout(object sender,LayoutEventArgs e)
{
this.Height = tbSelectedValue.Height + 6;
this.pnlBack.Size = new Size(this.Width, this.Height - 2);
//设置按钮的位置
this.btnSelect.Size = new Size(16, this.Height - 6);
btnSelect.Location = new Point(this.Width - this.btnSelect.Width - 4, 0);
this.tbSelectedValue.Location = new Point(2, 2);
this.tbSelectedValue.Width = this.Width - btnSelect.Width - 4;
checkListBox.Height =150;
//设置窗体
this.frmCheckList.Size = new Size(this.Width,this.checkListBox.Height);
this.pnlCheck.Size =frmCheckList.Size;
this.checkListBox.Width = this.frmCheckList.Width;
this.checkListBox.Height = this.frmCheckList.Height-lbSelectNo.Height;
ReloationGrip();
}
/// <summary>
/// 单价下拉框
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
public void btnSelect_Click(object sender,EventArgs e)
{
if (this.frmCheckList.Visible == false)
{
Rectangle rec = this.RectangleToScreen(this.ClientRectangle);
this.frmCheckList.Location = new Point(rec.X, rec.Y + this.pnlBack.Height);
this.frmCheckList.Show();
this.frmCheckList.BringToFront();
ReloationGrip();
}
else
this.frmCheckList.Hide();
}
//全选事件
private void lbSelectAll_Click(object sender, EventArgs e)
{
}
//取消
private void lbSelectNo_Click(object sender,EventArgs e)
{
}
private void checkListBox_LostFocus(object sender, EventArgs e)
{
//如果鼠标位置在下拉框按钮的以为地方，则隐藏下拉框
if (!this.btnSelect.RectangleToScreen(this.btnSelect.ClientRectangle).Contains(Cursor.Position))
{
frmCheckList.Hide();
}
}
private void checkListBox_ItemCheck(object sender, ItemCheckEventArgs e)
{
}
/// <summary>
/// 鼠标按下
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void lbGrip_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button==MouseButtons.Left)
{
int offsetX = System.Math.Abs(Cursor.Position.X - frmCheckList.RectangleToScreen(this.frmCheckList.ClientRectangle).Right);
int offsetY = System.Math.Abs(Cursor.Position.Y - frmCheckList.RectangleToScreen(this.frmCheckList.ClientRectangle).Bottom);
this.DragOffset = new Point(offsetX, offsetY);
}
}
/// <summary>
/// 鼠标移动
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void lbGrip_MouseMove(object sender,MouseEventArgs e)
{
if (e.Button==MouseButtons.Left)
{
//获取拉伸长度
int curWidth = Cursor.Position.X - frmCheckList.Location.X;
int curHeight = Cursor.Position.Y - frmCheckList.Location.Y;
if (curWidth<this.Width)
{
curWidth=this.Width;
}
if (curHeight<checkListBox.Height)
{
curHeight=checkListBox.Height;
}
this.frmCheckList.Size=new Size(this.Width,curHeight);
this.pnlCheck.Size=frmCheckList.Size;
this.checkListBox.Height=(this.frmCheckList.Height-lbGrip.Height)<50?50:this.frmCheckList.Height-lbGrip.Height;
ReloationGrip();
SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
SetStyle(ControlStyles.ResizeRedraw, true);
SetStyle(ControlStyles.UserPaint, true);
SetStyle(ControlStyles.AllPaintingInWmPaint, true);
}
}
#endregion
}
这样用户控件的布局以及完成，我们编译项目，就可以拖动用户控件到窗体上，看到效果了
2. 绑定和添加数据
2.1 从数据库中读取数据绑定显示
既然可以从数据库中读取数据，数据源就可以是DATATABLE,我们在这里为用户控件设置数据源，以及绑定后，要显示的字段，以及对于的值字段。
为控件添加以下属性
[csharp]
/// <summary>
/// 设置数据源
/// </summary>
public object DataSource
{
set
{
this.checkListBox.DataSource = value;
}
get
{
return checkListBox.DataSource;
}
}
/// <summary>
/// 设置值
/// </summary>
public string ValueMember
{
set
{
checkListBox.ValueMember = value;
}
}
/// <summary>
/// 设置显示名称
/// </summary>
public string DisplayMember
{
set
{
checkListBox.DisplayMember = value;
}
}
/// <summary>
/// 设置数据源
/// </summary>
public object DataSource
{
set
{
this.checkListBox.DataSource = value;
}
get
{
return checkListBox.DataSource;
}
}
/// <summary>
/// 设置值
/// </summary>
public string ValueMember
{
set
{
checkListBox.ValueMember = value;
}
}
/// <summary>
/// 设置显示名称
/// </summary>
public string DisplayMember
{
set
{
checkListBox.DisplayMember = value;
}
}
2.2 添加项
我们也可以不绑定数据源，为控件添加项，所有这里我们要为控件添加一个方法，可以实现手动添加项。
[csharp]
/// <summary>
/// 添加项
/// </summary>
public int AddItems(object value)
{
checkListBox.Items.Add(value);
return checkListBox.Items.Count;
}
/// <summary>
/// 添加项
/// </summary>
public int AddItems(object value)
{
checkListBox.Items.Add(value);
return checkListBox.Items.Count;
}
这样我们就为用户控件实现了两种显示数据的方法。下面我们看看在窗体中怎样使用这两种方法
在窗体上放置两个按钮，然后绑定数据
[csharp]
private void button1_Click(object sender, EventArgs e)
{
//绑定数据源
DataTable dt = new DataTable();
DataColumn dc1 = new DataColumn("weibo", typeof(System.String));
dt.Columns.Add(dc1);
DataColumn dc2 = new DataColumn("mail", typeof(System.String));
dt.Columns.Add(dc2);
DataColumn dc3 = new DataColumn("blog", typeof(System.String));
dt.Columns.Add(dc3);
for (int i = 0; i < 50; i++)
{
DataRow dr = dt.NewRow();
dr[0] = "下里巴人simple";
dr[1] = "524300045@qq.com";
dr[2] = "msdn" + i.ToString();
dt.Rows.Add(dr);
}
comCheckBoxList1.DataSource = dt;
comCheckBoxList1.DisplayMember = "weibo";
comCheckBoxList1.ValueMember = "mail";
}
private void button2_Click(object sender, EventArgs e)
{
//添加项
comCheckBoxList2.AddItems("邮箱:524300045@qq.com");
comCheckBoxList2.AddItems("微博:下里巴人simple");
}
private void button1_Click(object sender, EventArgs e)
{
//绑定数据源
DataTable dt = new DataTable();
DataColumn dc1 = new DataColumn("weibo", typeof(System.String));
dt.Columns.Add(dc1);
DataColumn dc2 = new DataColumn("mail", typeof(System.String));
dt.Columns.Add(dc2);
DataColumn dc3 = new DataColumn("blog", typeof(System.String));
dt.Columns.Add(dc3);
for (int i = 0; i < 50; i++)
{
DataRow dr = dt.NewRow();
dr[0] = "下里巴人simple";
dr[1] = "524300045@qq.com";
dr[2] = "msdn" + i.ToString();
dt.Rows.Add(dr);
}
comCheckBoxList1.DataSource = dt;
comCheckBoxList1.DisplayMember = "weibo";
comCheckBoxList1.ValueMember = "mail";
}
private void button2_Click(object sender, EventArgs e)
{
//添加项
comCheckBoxList2.AddItems("邮箱:524300045@qq.com");
comCheckBoxList2.AddItems("微博:下里巴人simple");
} 至此，第二步骤已经完成，可以实现大部分功能了.
3.事件处理
这里我们定义下全选事件，取消事件，和某项选中状态更改时发生的事件
[csharp]
//全选事件
private void lbSelectAll_Click(object sender, EventArgs e)
{
for (int i = 0; i < checkListBox.Items.Count; i++)
{
checkListBox.SetItemChecked(i, true);
 
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