CheckedListBox 类
显示一个 ListBox，其中在每项的左边显示一个复选框。
**命名空间:**System.Windows.Forms
**程序集:**System.Windows.Forms（在 system.windows.forms.dll 中）
语法
声明
<ComVisibleAttribute(True)> _
<ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch)> _
Public Class CheckedListBox
Inherits ListBox
用法
Dim instance As CheckedListBox
[ComVisibleAttribute(true)]
[ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch)]
public class CheckedListBox : ListBox
[ComVisibleAttribute(true)]
[ClassInterfaceAttribute(ClassInterfaceType::AutoDispatch)]
public ref class CheckedListBox : public ListBox
/** @attribute ComVisibleAttribute(true) */
/** @attribute ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch) */
public class CheckedListBox extends ListBox
ComVisibleAttribute(true)
ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch)
public class CheckedListBox extends ListBox
备注
该控件提供一个项列表，用户可以使用键盘或控件右侧的滚动条定位该列表。用户可以在一项或多项旁边放置选中标记，并且可以通过 CheckedListBox.CheckedItemCollection 和 CheckedListBox.CheckedIndexCollection 浏览选中项。
若要在运行时向列表添加对象，请用 AddRange 方法分配一个对象引用数组。然后，列表显示每个对象的默认字符串值。可以用 Add 方法向列表添加单个项。
CheckedListBox 对象通过 CheckState 枚举支持三种状态：Checked、Indeterminate 和 Unchecked。必须在代码中设置 Indeterminate 状态，因为 CheckedListBox 的用户界面未提供这样操作的机制。
如果 UseTabStops 为 true，CheckedListBox 将在某项的文本中识别并扩展制表符，从而创建列。但是，制表位已预设，无法进行更改。
CheckedListBox 类支持以下三种索引集合：
集合 |
封装类 |
|---|---|
CheckedListBox 控件中包含的所有项。 |
|
选中项（包括处于不确定状态的项），它是 CheckedListBox 控件中所包含项的子集。 |
CheckedListBox.CheckedItemCollection |
选中的索引，它是项集合中索引的子集。这些索引指定处于选中状态或不确定状态的项。 |
CheckedListBox.CheckedIndexCollection |
下面三个表是 CheckedListBox 类支持的三个索引集合的示例。
第一个表提供控件中项（控件中包含的所有项）的索引集合的示例。
索引 |
项 |
复选状态 |
|---|---|---|
0 |
对象 1 |
Unchecked |
1 |
对象 2 |
Checked |
2 |
对象 3 |
Unchecked |
3 |
对象 4 |
Indeterminate |
4 |
对象 5 |
Checked |
第二个表提供选中项的索引集合的示例。
索引 |
项 |
|---|---|
0 |
对象 2 |
1 |
对象 4 |
2 |
对象 5 |
第三个表提供选中项的索引的索引集合示例。
索引 |
项的索引 |
|---|---|
0 |
1 |
1 |
3 |
2 |
4 |
注意 不能将数据绑定到 CheckedListBox。请改用 ComboBox 或 ListBox 绑定数据。有关更多信息，请参见 如何：将 Windows 窗体 ComboBox 控件或 ListBox 控件绑定到数据。
示例
下面的示例阐释如何使用 CheckedListBox 的方法、属性和集合。这是个完整示例，将它复制到项目后即可运行。您可以选中或取消选中项，使用文本框添加项，以及在单击保存按钮后清除选中项。
Option Explicit
Option Strict
Imports System
Imports System.Drawing
Imports System.Collections
Imports System.ComponentModel
Imports System.Windows.Forms
Imports System.Data
Imports System.IO
Namespace WindowsApplication1
Public Class Form1
Inherits System.Windows.Forms.Form
Private WithEvents checkedListBox1 As System.Windows.Forms.CheckedListBox
Private WithEvents textBox1 As System.Windows.Forms.TextBox
Private WithEvents button1 As System.Windows.Forms.Button
Private WithEvents button2 As System.Windows.Forms.Button
Private WithEvents listBox1 As System.Windows.Forms.ListBox
Private WithEvents button3 As System.Windows.Forms.Button
Private components As System.ComponentModel.Container
Public Sub New()
InitializeComponent()
' Sets up the initial objects in the CheckedListBox.
Dim myFruit As String() = {"Apples", "Oranges", "Tomato"}
checkedListBox1.Items.AddRange(myFruit)
' Changes the selection mode from double-click to single click.
checkedListBox1.CheckOnClick = True
End Sub 'New
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub
Private Sub InitializeComponent()
Me.components = New System.ComponentModel.Container()
Me.textBox1 = New System.Windows.Forms.TextBox()
Me.checkedListBox1 = New System.Windows.Forms.CheckedListBox()
Me.listBox1 = New System.Windows.Forms.ListBox()
Me.button1 = New System.Windows.Forms.Button()
Me.button2 = New System.Windows.Forms.Button()
Me.button3 = New System.Windows.Forms.Button()
Me.textBox1.Location = New System.Drawing.Point(144, 64)
Me.textBox1.Size = New System.Drawing.Size(128, 20)
Me.textBox1.TabIndex = 1
Me.checkedListBox1.Location = New System.Drawing.Point(16, 64)
Me.checkedListBox1.Size = New System.Drawing.Size(120, 184)
Me.checkedListBox1.TabIndex = 0
Me.listBox1.Location = New System.Drawing.Point(408, 64)
Me.listBox1.Size = New System.Drawing.Size(128, 186)
Me.listBox1.TabIndex = 3
Me.button1.Enabled = False
Me.button1.Location = New System.Drawing.Point(144, 104)
Me.button1.Size = New System.Drawing.Size(104, 32)
Me.button1.TabIndex = 2
Me.button1.Text = "Add Fruit"
Me.button2.Enabled = False
Me.button2.Location = New System.Drawing.Point(288, 64)
Me.button2.Size = New System.Drawing.Size(104, 32)
Me.button2.TabIndex = 2
Me.button2.Text = "Show Order"
Me.button3.Enabled = False
Me.button3.Location = New System.Drawing.Point(288, 104)
Me.button3.Size = New System.Drawing.Size(104, 32)
Me.button3.TabIndex = 2
Me.button3.Text = "Save Order"
Me.ClientSize = New System.Drawing.Size(563, 273)
Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.listBox1, Me.button3, Me.button2, Me.button1, Me.textBox1, Me.checkedListBox1})
Me.Text = "Fruit Order"
End Sub 'InitializeComponent
<STAThread()> _
Public Shared Sub Main()
Application.Run(New Form1())
End Sub 'Main
' Adds the string if the text box has data in it.
Private Sub button1_Click(sender As Object, _
e As System.EventArgs) Handles button1.Click
If textBox1.Text <> "" Then
If checkedListBox1.CheckedItems.Contains(textBox1.Text) = False Then
checkedListBox1.Items.Add(textBox1.Text, CheckState.Checked)
End If
textBox1.Text = ""
End If
End Sub 'button1_Click
' Activates or deactivates the Add button.
Private Sub textBox1_TextChanged(sender As Object, _
e As System.EventArgs) Handles textBox1.TextChanged
If textBox1.Text = "" Then
button1.Enabled = False
Else
button1.Enabled = True
End If
End Sub 'textBox1_TextChanged
' Moves the checked items from the CheckedListBox to the listBox.
Private Sub button2_Click(sender As Object, _
e As System.EventArgs) Handles button2.Click
listBox1.Items.Clear()
button3.Enabled = False
Dim i As Integer
For i = 0 To checkedListBox1.CheckedItems.Count - 1
listBox1.Items.Add(checkedListBox1.CheckedItems(i))
Next i
If listBox1.Items.Count > 0 Then
button3.Enabled = True
End If
End Sub 'button2_Click
' Activates the move button if there are checked items.
Private Sub checkedListBox1_ItemCheck(sender As Object, _
e As ItemCheckEventArgs) Handles checkedListBox1.ItemCheck
If e.NewValue = CheckState.Unchecked Then
If checkedListBox1.CheckedItems.Count = 1 Then
button2.Enabled = False
End If
Else
button2.Enabled = True
End If
End Sub 'checkedListBox1_ItemCheck
' Saves the items to a file.
Private Sub button3_Click(sender As Object, _
e As System.EventArgs) Handles button3.Click
' Insert code to save a file.
listBox1.Items.Clear()
Dim myEnumerator As IEnumerator
myEnumerator = checkedListBox1.CheckedIndices.GetEnumerator()
Dim y As Integer
While myEnumerator.MoveNext() <> False
y = CInt(myEnumerator.Current)
checkedListBox1.SetItemChecked(y, False)
End While
button3.Enabled = False
End Sub 'button3_Click
End Class 'Form1
End Namespace 'WindowsApplication1
namespace WindowsApplication1
{
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.IO ;
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.CheckedListBox checkedListBox1;
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.Button button2;
private System.Windows.Forms.ListBox listBox1;
private System.Windows.Forms.Button button3;
private System.ComponentModel.Container components;
public Form1()
{
InitializeComponent();
// Sets up the initial objects in the CheckedListBox.
string[] myFruit = {"Apples", "Oranges","Tomato"};
checkedListBox1.Items.AddRange(myFruit);
// Changes the selection mode from double-click to single click.
checkedListBox1.CheckOnClick = true;
}
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
private void InitializeComponent()
{
this.components = new System.ComponentModel.Container();
this.textBox1 = new System.Windows.Forms.TextBox();
this.checkedListBox1 = new System.Windows.Forms.CheckedListBox();
this.listBox1 = new System.Windows.Forms.ListBox();
this.button1 = new System.Windows.Forms.Button();
this.button2 = new System.Windows.Forms.Button();
this.button3 = new System.Windows.Forms.Button();
this.textBox1.Location = new System.Drawing.Point(144, 64);
this.textBox1.Size = new System.Drawing.Size(128, 20);
this.textBox1.TabIndex = 1;
this.textBox1.TextChanged += new System.EventHandler(this.textBox1_TextChanged);
this.checkedListBox1.Location = new System.Drawing.Point(16, 64);
this.checkedListBox1.Size = new System.Drawing.Size(120, 184);
this.checkedListBox1.TabIndex = 0;
this.checkedListBox1.ItemCheck += new System.Windows.Forms.ItemCheckEventHandler(this.checkedListBox1_ItemCheck);
this.listBox1.Location = new System.Drawing.Point(408, 64);
this.listBox1.Size = new System.Drawing.Size(128, 186);
this.listBox1.TabIndex = 3;
this.button1.Enabled = false;
this.button1.Location = new System.Drawing.Point(144, 104);
this.button1.Size = new System.Drawing.Size(104, 32);
this.button1.TabIndex = 2;
this.button1.Text = "Add Fruit";
this.button1.Click += new System.EventHandler(this.button1_Click);
this.button2.Enabled = false;
this.button2.Location = new System.Drawing.Point(288, 64);
this.button2.Size = new System.Drawing.Size(104, 32);
this.button2.TabIndex = 2;
this.button2.Text = "Show Order";
this.button2.Click += new System.EventHandler(this.button2_Click);
this.button3.Enabled = false;
this.button3.Location = new System.Drawing.Point(288, 104);
this.button3.Size = new System.Drawing.Size(104, 32);
this.button3.TabIndex = 2;
this.button3.Text = "Save Order";
this.button3.Click += new System.EventHandler(this.button3_Click);
this.ClientSize = new System.Drawing.Size(563, 273);
this.Controls.AddRange(new System.Windows.Forms.Control[] {this.listBox1,
this.button3,
this.button2,
this.button1,
this.textBox1,
this.checkedListBox1});
this.Text = "Fruit Order";
}
[STAThread]
public static void Main(string[] args)
{
Application.Run(new Form1());
}
// Adds the string if the text box has data in it.
private void button1_Click(object sender, System.EventArgs e)
{
if(textBox1.Text != "")
{
if(checkedListBox1.CheckedItems.Contains(textBox1.Text)== false)
checkedListBox1.Items.Add(textBox1.Text,CheckState.Checked);
textBox1.Text = "";
}
}
// Activates or deactivates the Add button.
private void textBox1_TextChanged(object sender, System.EventArgs e)
{
if (textBox1.Text == "")
{
button1.Enabled = false;
}
else
{
button1.Enabled = true;
}
}
// Moves the checked items from the CheckedListBox to the listBox.
private void button2_Click(object sender, System.EventArgs e)
{
listBox1.Items.Clear();
button3.Enabled=false;
for (int i=0; i< checkedListBox1.CheckedItems.Count;i++)
{
listBox1.Items.Add(checkedListBox1.CheckedItems[i]);
}
if (listBox1.Items.Count>0)
button3.Enabled=true;
}
// Activates the move button if there are checked items.
private void checkedListBox1_ItemCheck(object sender, ItemCheckEventArgs e)
{
if(e.NewValue==CheckState.Unchecked)
{
if(checkedListBox1.CheckedItems.Count==1)
{
button2.Enabled = false;
}
}
else
{
button2.Enabled = true;
}
}
// Saves the items to a file.
private void button3_Click(object sender, System.EventArgs e)
{
// Insert code to save a file.
listBox1.Items.Clear();
IEnumerator myEnumerator;
myEnumerator = checkedListBox1.CheckedIndices.GetEnumerator();
int y;
while (myEnumerator.MoveNext() != false)
{
y =(int) myEnumerator.Current;
checkedListBox1.SetItemChecked(y, false);
}
button3.Enabled = false ;
}
}
}
#using <System.Data.dll>
#using <System.Windows.Forms.dll>
#using <System.dll>
#using <System.Drawing.dll>
using namespace System;
using namespace System::Drawing;
using namespace System::Collections;
using namespace System::ComponentModel;
using namespace System::Windows::Forms;
using namespace System::Data;
using namespace System::IO;
public ref class Form1: public System::Windows::Forms::Form
{
private:
System::Windows::Forms::CheckedListBox^ checkedListBox1;
System::Windows::Forms::TextBox^ textBox1;
System::Windows::Forms::Button^ button1;
System::Windows::Forms::Button^ button2;
System::Windows::Forms::ListBox^ listBox1;
System::Windows::Forms::Button^ button3;
System::ComponentModel::Container^ components;
public:
Form1()
{
InitializeComponent();
// Sets up the initial objects in the CheckedListBox.
array<String^>^myFruit = {"Apples","Oranges","Tomato"};
checkedListBox1->Items->AddRange( myFruit );
// Changes the selection mode from double-click to single click.
checkedListBox1->CheckOnClick = true;
}
public:
~Form1()
{
if ( components != nullptr )
{
delete components;
}
}
private:
void InitializeComponent()
{
this->components = gcnew System::ComponentModel::Container;
this->textBox1 = gcnew System::Windows::Forms::TextBox;
this->checkedListBox1 = gcnew System::Windows::Forms::CheckedListBox;
this->listBox1 = gcnew System::Windows::Forms::ListBox;
this->button1 = gcnew System::Windows::Forms::Button;
this->button2 = gcnew System::Windows::Forms::Button;
this->button3 = gcnew System::Windows::Forms::Button;
this->textBox1->Location = System::Drawing::Point( 144, 64 );
this->textBox1->Size = System::Drawing::Size( 128, 20 );
this->textBox1->TabIndex = 1;
this->textBox1->TextChanged += gcnew System::EventHandler( this, &Form1::textBox1_TextChanged );
this->checkedListBox1->Location = System::Drawing::Point( 16, 64 );
this->checkedListBox1->Size = System::Drawing::Size( 120, 184 );
this->checkedListBox1->TabIndex = 0;
this->checkedListBox1->ItemCheck += gcnew System::Windows::Forms::ItemCheckEventHandler( this, &Form1::checkedListBox1_ItemCheck );
this->listBox1->Location = System::Drawing::Point( 408, 64 );
this->listBox1->Size = System::Drawing::Size( 128, 186 );
this->listBox1->TabIndex = 3;
this->button1->Enabled = false;
this->button1->Location = System::Drawing::Point( 144, 104 );
this->button1->Size = System::Drawing::Size( 104, 32 );
this->button1->TabIndex = 2;
this->button1->Text = "Add Fruit";
this->button1->Click += gcnew System::EventHandler( this, &Form1::button1_Click );
this->button2->Enabled = false;
this->button2->Location = System::Drawing::Point( 288, 64 );
this->button2->Size = System::Drawing::Size( 104, 32 );
this->button2->TabIndex = 2;
this->button2->Text = "Show Order";
this->button2->Click += gcnew System::EventHandler( this, &Form1::button2_Click );
this->button3->Enabled = false;
this->button3->Location = System::Drawing::Point( 288, 104 );
this->button3->Size = System::Drawing::Size( 104, 32 );
this->button3->TabIndex = 2;
this->button3->Text = "Save Order";
this->button3->Click += gcnew System::EventHandler( this, &Form1::button3_Click );
this->ClientSize = System::Drawing::Size( 563, 273 );
array<System::Windows::Forms::Control^>^temp0 = {this->listBox1,this->button3,this->button2,this->button1,this->textBox1,this->checkedListBox1};
this->Controls->AddRange( temp0 );
this->Text = "Fruit Order";
}
// Adds the string if the text box has data in it.
void button1_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
if ( !textBox1->Text->Equals( "" ) )
{
if ( checkedListBox1->CheckedItems->Contains( textBox1->Text ) == false )
checkedListBox1->Items->Add( textBox1->Text, CheckState::Checked );
textBox1->Text = "";
}
}
// Activates or deactivates the Add button.
void textBox1_TextChanged( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
if ( textBox1->Text->Equals( "" ) )
{
button1->Enabled = false;
}
else
{
button1->Enabled = true;
}
}
// Moves the checked items from the CheckedListBox to the listBox.
void button2_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
listBox1->Items->Clear();
button3->Enabled = false;
for ( int i = 0; i < checkedListBox1->CheckedItems->Count; i++ )
{
listBox1->Items->Add( checkedListBox1->CheckedItems[ i ] );
}
if ( listBox1->Items->Count > 0 )
button3->Enabled = true;
}
// Activates the move button if there are checked items.
void checkedListBox1_ItemCheck( Object^ /*sender*/, ItemCheckEventArgs^ e )
{
if ( e->NewValue == CheckState::Unchecked )
{
if ( checkedListBox1->CheckedItems->Count == 1 )
{
button2->Enabled = false;
}
}
else
{
button2->Enabled = true;
}
}
// Saves the items to a file.
void button3_Click( Object^ /*sender*/, System::EventArgs^ /*e*/ )
{
// Insert code to save a file.
listBox1->Items->Clear();
IEnumerator^ myEnumerator;
myEnumerator = checkedListBox1->CheckedIndices->GetEnumerator();
int y;
while ( myEnumerator->MoveNext() != false )
{
y = safe_cast<Int32>(myEnumerator->Current);
checkedListBox1->SetItemChecked( y, false );
}
button3->Enabled = false;
}
};
[STAThread]
int main()
{
Application::Run( gcnew Form1 );
}
import System.*;
import System.Drawing.*;
import System.Collections.*;
import System.ComponentModel.*;
import System.Windows.Forms.*;
import System.Data.*;
import System.IO.*;
public class Form1 extends System.Windows.Forms.Form
{
private System.Windows.Forms.CheckedListBox checkedListBox1;
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.Button button1;
private System.Windows.Forms.Button button2;
private System.Windows.Forms.ListBox listBox1;
private System.Windows.Forms.Button button3;
private System.ComponentModel.Container components;
public Form1()
{
InitializeComponent();
// Sets up the initial objects in the CheckedListBox.
String myFruit[] = { "Apples", "Oranges", "Tomato" };
checkedListBox1.get_Items().AddRange(myFruit);
// Changes the selection mode from double-click to single click.
checkedListBox1.set_CheckOnClick(true);
} //Form1
protected void Dispose(boolean disposing)
{
if (disposing) {
if (components != null) {
components.Dispose();
}
}
super.Dispose(disposing);
} //Dispose
private void InitializeComponent()
{
this.components = new System.ComponentModel.Container();
this.textBox1 = new System.Windows.Forms.TextBox();
this.checkedListBox1 = new System.Windows.Forms.CheckedListBox();
this.listBox1 = new System.Windows.Forms.ListBox();
this.button1 = new System.Windows.Forms.Button();
this.button2 = new System.Windows.Forms.Button();
this.button3 = new System.Windows.Forms.Button();
this.textBox1.set_Location(new System.Drawing.Point(144, 64));
this.textBox1.set_Size(new System.Drawing.Size(128, 20));
this.textBox1.set_TabIndex(1);
this.textBox1.add_TextChanged(new System.EventHandler(
this.textBox1_TextChanged));
this.checkedListBox1.set_Location(new System.Drawing.Point(16, 64));
this.checkedListBox1.set_Size(new System.Drawing.Size(120, 184));
this.checkedListBox1.set_TabIndex(0);
this.checkedListBox1.add_ItemCheck(
new System.Windows.Forms.ItemCheckEventHandler(
this.checkedListBox1_ItemCheck));
this.listBox1.set_Location(new System.Drawing.Point(408, 64));
this.listBox1.set_Size(new System.Drawing.Size(128, 186));
this.listBox1.set_TabIndex(3);
this.button1.set_Enabled(false);
this.button1.set_Location(new System.Drawing.Point(144, 104));
this.button1.set_Size(new System.Drawing.Size(104, 32));
this.button1.set_TabIndex(2);
this.button1.set_Text("Add Fruit");
this.button1.add_Click(new System.EventHandler(this.button1_Click));
this.button2.set_Enabled(false);
this.button2.set_Location(new System.Drawing.Point(288, 64));
this.button2.set_Size(new System.Drawing.Size(104, 32));
this.button2.set_TabIndex(2);
this.button2.set_Text("Show Order");
this.button2.add_Click(new System.EventHandler(this.button2_Click));
this.button3.set_Enabled(false);
this.button3.set_Location(new System.Drawing.Point(288, 104));
this.button3.set_Size(new System.Drawing.Size(104, 32));
this.button3.set_TabIndex(2);
this.button3.set_Text("Save Order");
this.button3.add_Click(new System.EventHandler(this.button3_Click));
this.set_ClientSize(new System.Drawing.Size(563, 273));
this.get_Controls().AddRange(new System.Windows.Forms.Control[] {
this.listBox1, this.button3, this.button2, this.button1,
this.textBox1, this.checkedListBox1});
this.set_Text("Fruit Order");
} //InitializeComponent
/** @attribute STAThread()
*/
public static void main(String[] args)
{
Application.Run(new Form1());
} //main
// Adds the string if the text box has data in it.
private void button1_Click(Object sender, System.EventArgs e)
{
if (!textBox1.get_Text().Equals("")) {
if (checkedListBox1.get_CheckedItems().Contains(textBox1.get_Text())
== false) {
checkedListBox1.get_Items().Add(textBox1.get_Text(),
CheckState.Checked);
}
textBox1.set_Text("");
}
} //button1_Click
// Activates or deactivates the Add button.
private void textBox1_TextChanged(Object sender, System.EventArgs e)
{
if (textBox1.get_Text().Equals("")) {
button1.set_Enabled(false);
}
else {
button1.set_Enabled(true);
}
} //textBox1_TextChanged
// Moves the checked items from the CheckedListBox to the listBox.
private void button2_Click(Object sender, System.EventArgs e)
{
listBox1.get_Items().Clear();
button3.set_Enabled(false);
for (int i = 0; i < checkedListBox1.get_CheckedItems().get_Count();
i++) {
listBox1.get_Items().Add(
checkedListBox1.get_CheckedItems().get_Item(i));
}
if (listBox1.get_Items().get_Count() > 0) {
button3.set_Enabled(true);
}
} //button2_Click
// Activates the move button if there are checked items.
private void checkedListBox1_ItemCheck(Object sender, ItemCheckEventArgs e)
{
if (e.get_NewValue().Equals(CheckState.Unchecked)) {
if (checkedListBox1.get_CheckedItems().get_Count() == 1) {
button2.set_Enabled(false);
}
}
else {
button2.set_Enabled(true);
}
} //checkedListBox1_ItemCheck
// Saves the items to a file.
private void button3_Click(Object sender, System.EventArgs e)
{
// Insert code to save a file.
listBox1.get_Items().Clear();
IEnumerator myEnumerator;
myEnumerator = checkedListBox1.get_CheckedIndices().GetEnumerator();
int y;
while ((myEnumerator.MoveNext() != false)) {
y = (int)(System.Convert.ToInt32(myEnumerator.get_Current()));
checkedListBox1.SetItemChecked(y, false);
}
button3.set_Enabled(false);
} //button3_Click
} //Form1
继承层次结构
System.Object
System.MarshalByRefObject
System.ComponentModel.Component
System.Windows.Forms.Control
System.Windows.Forms.ListControl
System.Windows.Forms.ListBox
System.Windows.Forms.CheckedListBox
线程安全
此类型的任何公共静态（Visual Basic 中的 Shared）成员都是线程安全的，但不保证所有实例成员都是线程安全的。
平台
Windows 98、Windows 2000 SP4、Windows CE、Windows Millennium Edition、Windows Mobile for Pocket PC、Windows Mobile for Smartphone、Windows Server 2003、Windows XP Media Center Edition、Windows XP Professional x64 Edition、Windows XP SP2、Windows XP Starter Edition
.NET Framework 并不是对每个平台的所有版本都提供支持。有关受支持版本的列表，请参见系统要求。
版本信息
.NET Framework
受以下版本支持：2.0、1.1、1.0
请参见
参考
CheckedListBox 成员
System.Windows.Forms 命名空间
ListBox