ListControl 类
为 ListBox 类和 ComboBox 类提供一个共同的成员实现方法。
**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 MustInherit Class ListControl
Inherits Control
用法
Dim instance As ListControl
[ComVisibleAttribute(true)]
[ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch)]
public abstract class ListControl : Control
[ComVisibleAttribute(true)]
[ClassInterfaceAttribute(ClassInterfaceType::AutoDispatch)]
public ref class ListControl abstract : public Control
/** @attribute ComVisibleAttribute(true) */
/** @attribute ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch) */
public abstract class ListControl extends Control
ComVisibleAttribute(true)
ClassInterfaceAttribute(ClassInterfaceType.AutoDispatch)
public abstract class ListControl extends Control
备注
ListControl 类为 ListBox 和 ComboBox 控件提供了共同元素的实现方法。
以下属性是数据绑定 ListBox 或 ComboBox 的用户的首要考虑因素：DataSource、DisplayMember、SelectedValue 和 ValueMember 属性。
示例
下面的代码示例是一个完整的应用程序，它说明在 ListBox 类实现了 ListControl 类的 DataSource、DisplayMember、ValueMember 和 SelectedValue 等成员后，如何使用这些成员。本示例加载了 ArrayList 和列表框。当用户在列表框中选择了一个项时，将把选定的值用于返回与选定的项关联的数据。
Imports System
Imports System.Windows.Forms
Imports System.Drawing
Imports System.Collections
Public Class USState
Private myShortName As String
Private myLongName As String
Public Sub New(strLongName As String, strShortName As String)
Me.myShortName = strShortName
Me.myLongName = strLongName
End Sub 'New
Public ReadOnly Property ShortName() As String
Get
Return myShortName
End Get
End Property
Public ReadOnly Property LongName() As String
Get
Return myLongName
End Get
End Property
Public Overrides Function ToString() As String
Return Me.ShortName + " - " + Me.LongName
End Function 'ToString
End Class 'USState
Public Class ListBoxSample3
Inherits Form
Private ListBox1 As New ListBox()
Private textBox1 As New TextBox()
<STAThread()> _
Shared Sub Main()
Application.Run(New ListBoxSample3())
End Sub 'Main
Public Sub New()
Me.ClientSize = New Size(292, 181)
Me.Text = "ListBox Sample3"
ListBox1.Location = New Point(24, 16)
ListBox1.Name = "ListBox1"
ListBox1.Size = New Size(232, 130)
textBox1.Location = New Point(24, 160)
textBox1.Name = "textBox1"
textBox1.Size = New Size(240, 24)
Me.Controls.AddRange(New Control() {ListBox1, textBox1})
' Populates the list box using DataSource.
' DisplayMember is used to display just the long name of each state.
Dim USStates As New ArrayList()
USStates.Add(New USState("Alabama", "AL"))
USStates.Add(New USState("Washington", "WA"))
USStates.Add(New USState("West Virginia", "WV"))
USStates.Add(New USState("Wisconsin", "WI"))
USStates.Add(New USState("Wyoming", "WY"))
AddHandler ListBox1.SelectedValueChanged, AddressOf ListBox1_SelectedValueChanged
ListBox1.DataSource = USStates
ListBox1.DisplayMember = "LongName"
ListBox1.ValueMember = "ShortName"
End Sub 'New
Private Sub InitializeComponent()
End Sub 'InitializeComponent
Private Sub ListBox1_SelectedValueChanged(sender As Object, e As EventArgs)
If ListBox1.SelectedIndex <> - 1 Then
textBox1.Text = ListBox1.SelectedValue.ToString()
End If
End Sub 'ListBox1_SelectedValueChanged
End Class 'ListBoxSample3
using System;
using System.Windows.Forms ;
using System.Drawing ;
using System.Collections ;
namespace MyListControlSample
{
public class USState
{
private string myShortName ;
private string myLongName ;
public USState(string strLongName, string strShortName)
{
this.myShortName = strShortName;
this.myLongName = strLongName;
}
public string ShortName
{
get
{
return myShortName;
}
}
public string LongName
{
get
{
return myLongName ;
}
}
public override string ToString()
{
return this.ShortName + " - " + this.LongName;
}
}
public class ListBoxSample3:Form
{
private ListBox ListBox1 = new ListBox();
private TextBox textBox1 = new TextBox() ;
[STAThread]
static void Main()
{
Application.Run(new ListBoxSample3()) ;
}
public ListBoxSample3()
{
this.ClientSize = new Size(292, 181) ;
this.Text = "ListBox Sample3" ;
ListBox1.Location = new Point(24, 16) ;
ListBox1.Name = "ListBox1" ;
ListBox1.Size = new Size(232, 130) ;
textBox1.Location = new Point(24, 160) ;
textBox1.Name = "textBox1" ;
textBox1.Size = new Size(240, 24) ;
this.Controls.AddRange(new Control[] {ListBox1, textBox1}) ;
// Populates the list box using DataSource.
// DisplayMember is used to display just the long name of each state.
ArrayList USStates = new ArrayList() ;
USStates.Add(new USState("Alabama", "AL"));
USStates.Add(new USState("Washington", "WA")) ;
USStates.Add(new USState("West Virginia", "WV"));
USStates.Add(new USState("Wisconsin", "WI")) ;
USStates.Add(new USState("Wyoming", "WY"));
ListBox1.SelectedValueChanged += new EventHandler(ListBox1_SelectedValueChanged);
ListBox1.DataSource = USStates ;
ListBox1.DisplayMember = "LongName" ;
ListBox1.ValueMember = "ShortName" ;
}
private void InitializeComponent()
{
}
private void ListBox1_SelectedValueChanged(object sender, EventArgs e)
{
if (ListBox1.SelectedIndex != -1)
textBox1.Text = ListBox1.SelectedValue.ToString();
}
}
}
#using <System.dll>
#using <System.Drawing.dll>
#using <System.Windows.Forms.dll>
using namespace System;
using namespace System::Windows::Forms;
using namespace System::Drawing;
using namespace System::Collections;
public ref class USState
{
private:
String^ myShortName;
String^ myLongName;
public:
USState( String^ strLongName, String^ strShortName )
{
this->myShortName = strShortName;
this->myLongName = strLongName;
}
property String^ ShortName
{
String^ get()
{
return myShortName;
}
}
property String^ LongName
{
String^ get()
{
return myLongName;
}
}
virtual String^ ToString() override
{
return String::Concat( this->ShortName, " - ", this->LongName );
}
};
public ref class ListBoxSample3: public Form
{
private:
ListBox^ ListBox1;
TextBox^ textBox1;
public:
ListBoxSample3()
{
ListBox1 = gcnew ListBox;
textBox1 = gcnew TextBox;
this->ClientSize = System::Drawing::Size( 292, 181 );
this->Text = "ListBox Sample3";
ListBox1->Location = Point(24,16);
ListBox1->Name = "ListBox1";
ListBox1->Size = System::Drawing::Size( 232, 130 );
textBox1->Location = Point(24,160);
textBox1->Name = "textBox1";
textBox1->Size = System::Drawing::Size( 240, 24 );
array<Control^>^temp2 = {ListBox1,textBox1};
this->Controls->AddRange( temp2 );
// Populates the list box using DataSource.
// DisplayMember is used to display just the long name of each state.
ArrayList^ USStates = gcnew ArrayList;
USStates->Add( gcnew USState( "Alabama","AL" ) );
USStates->Add( gcnew USState( "Washington","WA" ) );
USStates->Add( gcnew USState( "West Virginia","WV" ) );
USStates->Add( gcnew USState( "Wisconsin","WI" ) );
USStates->Add( gcnew USState( "Wyoming","WY" ) );
ListBox1->SelectedValueChanged += gcnew EventHandler( this, &ListBoxSample3::ListBox1_SelectedValueChanged );
ListBox1->DataSource = USStates;
ListBox1->DisplayMember = "LongName";
ListBox1->ValueMember = "ShortName";
}
void InitializeComponent(){}
private:
void ListBox1_SelectedValueChanged( Object^ /*sender*/, EventArgs^ /*e*/ )
{
if ( ListBox1->SelectedIndex != -1 )
textBox1->Text = ListBox1->SelectedValue->ToString();
}
};
[STAThread]
int main()
{
Application::Run( gcnew ListBoxSample3 );
}
package MyListControlSample;
import System.*;
import System.Windows.Forms.*;
import System.Drawing.*;
import System.Collections.*;
public class USState
{
private String myShortName;
private String myLongName;
public USState(String strLongName, String strShortName)
{
this.myShortName = strShortName;
this.myLongName = strLongName;
} //USState
/** @property
*/
public String get_ShortName()
{
return myShortName;
}//get_ShortName
/** @property
*/
public String get_LongName()
{
return myLongName;
}//get_LongName
public String ToString()
{
return this.get_ShortName() + " - " + this.get_LongName();
} //ToString
} //USState
public class ListBoxSample3 extends Form
{
private ListBox listBox1 = new ListBox();
private TextBox textBox1 = new TextBox();
/** @attribute STAThread()
*/
public static void main(String[] args)
{
Application.Run(new ListBoxSample3());
} //main
public ListBoxSample3()
{
this.set_ClientSize(new Size(292, 181));
this.set_Text("ListBox Sample3");
listBox1.set_Location(new Point(24, 16));
listBox1.set_Name("ListBox1");
listBox1.set_Size(new Size(232, 130));
textBox1.set_Location(new Point(24, 160));
textBox1.set_Name("textBox1");
textBox1.set_Size(new Size(240, 24));
this.get_Controls().AddRange(new Control[] { listBox1, textBox1 });
// Populates the list box using DataSource.
// DisplayMember is used to display just the long name of each state.
ArrayList uSStates = new ArrayList();
uSStates.Add(new USState("Alabama", "AL"));
uSStates.Add(new USState("Washington", "WA"));
uSStates.Add(new USState("West Virginia", "WV"));
uSStates.Add(new USState("Wisconsin", "WI"));
uSStates.Add(new USState("Wyoming", "WY"));
listBox1.add_SelectedValueChanged(
new EventHandler(listBox1_SelectedValueChanged));
listBox1.set_DataSource(uSStates);
listBox1.set_DisplayMember("LongName");
listBox1.set_ValueMember("ShortName");
} //ListBoxSample3
private void InitializeComponent()
{
} //InitializeComponent
private void listBox1_SelectedValueChanged(Object sender, EventArgs e)
{
if (listBox1.get_SelectedIndex() != -1) {
textBox1.set_Text(listBox1.get_SelectedValue().ToString());
}
} //listBox1_SelectedValueChanged
} //ListBoxSample3
继承层次结构
System.Object
System.MarshalByRefObject
System.ComponentModel.Component
System.Windows.Forms.Control
System.Windows.Forms.ListControl
System.Windows.Forms.ComboBox
System.Windows.Forms.ListBox
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
.NET Compact Framework
受以下版本支持：2.0、1.0