Control.OnClick メソッド

.NET Framework クラス ライブラリ リファレンス

Control.OnClick メソッド

Click イベントを発生させます。

名前空間: System.Windows.Forms
アセンブリ: System.Windows.Forms (system.windows.forms.dll 内)
構文

Visual Basic (宣言)

Protected Overridable Sub
 OnClick ( _
    e As EventArgs _
)

Visual Basic (使用法)

Dim e As EventArgs

Me.OnClick(e)

C#

protected virtual void OnClick (
    EventArgs e
)

C++

protected:
virtual void OnClick (
    EventArgs^ e
)

J#

protected void OnClick (
    EventArgs e
)

JScript

protected function OnClick (
    e : EventArgs
)

パラメータ

e

イベント データを格納している EventArgs。

解説

イベントが発生すると、デリゲートを使用してイベント ハンドラが呼び出されます。詳細については、「イベントの発生」を参照してください。

OnClick メソッドを使用すると、デリゲートを結び付けずに、派生クラスでイベントを処理することもできます。派生クラスでイベントを処理する場合は、この手法をお勧めします。

継承時の注意 派生クラスで OnClick をオーバーライドする場合は、登録されているデリゲートがイベントを受け取ることができるように、基本クラスの OnClick メソッドを呼び出してください。

使用例

派生クラスの OnClick メソッドをオーバーライドする方法を次のコード例に示します。この例を実行するには、次のコードを、同じファイル内のフォーム クラスの後に貼り付けます。そして、SingleClickTextBox 型のテキストボックスをフォームに追加します。

Visual Basic

' This is a custom TextBox control that overrides the OnClick method
' to allow one-click selection of the text in the text box.

Public Class SingleClickTextBox
    Inherits TextBox

    Protected Overrides Sub
 OnClick(ByVal e As EventArgs)
        Me.SelectAll()
        MyBase.OnClick(e)
    End Sub


End Class

C#

// This is a custom TextBox control that overrides the OnClick method
// to allow one-click selection of the text in the text box.

public class SingleClickTextBox: TextBox

{
    protected override void OnClick(EventArgs
 e)
    {
        this.SelectAll();
        base.OnClick(e);
    }


}

C++

// This is a custom TextBox control that overrides the OnClick method
// to allow one-click selection of the text in the text box.
public ref class SingleClickTextBox: public
 TextBox
{
protected:
   virtual void OnClick( EventArgs^ e ) override
   {
      this->SelectAll();
      TextBox::OnClick( e );
   }
};

J#

// This is a custom TextBox control that overrides the OnClick method
// to allow one-click selection of the text in the text box.
public class SingleClickTextBox extends TextBox
{
    protected void OnClick(EventArgs e)
    {
        this.SelectAll();
        super.OnClick(e);
    } //OnClick
} //SingleClickTextBox 

Click イベントおよびイベント ハンドラのさまざまな使用方法の 1 つを次のコード例に示します。

Visual Basic

' This example uses the Parent property and the Find method of Control
 to set
' properties on the parent control of a Button and its Form. The example
 assumes
' that a Button control named button1 is located within a GroupBox control.
 The 
' example also assumes that the Click event of the Button control is
 connected to
' the event handler method defined in the example.
Private Sub button1_Click(sender As
 Object, e As System.EventArgs) Handles
 button1.Click
   ' Get the control the Button control is located in. In this case
 a GroupBox.
   Dim control As Control = button1.Parent
   ' Set the text and backcolor of the parent control.
   control.Text = "My Groupbox"
   control.BackColor = Color.Blue
   ' Get the form that the Button control is contained within.
   Dim myForm As Form = button1.FindForm()
   ' Set the text and color of the form containing the Button.
   myForm.Text = "The Form of My Control"
   myForm.BackColor = Color.Red
End Sub

C#

// This example uses the Parent property and the Find method of Control
 to set
// properties on the parent control of a Button and its Form. The example
 assumes
// that a Button control named button1 is located within a GroupBox
 control. The 
// example also assumes that the Click event of the Button control is
 connected to
// the event handler method defined in the example.
private void button1_Click(object sender, System.EventArgs
 e)
{
   // Get the control the Button control is located in. In this case
 a GroupBox.
   Control control = button1.Parent;
   // Set the text and backcolor of the parent control.
   control.Text = "My Groupbox";
   control.BackColor = Color.Blue;
   // Get the form that the Button control is contained within.
   Form myForm = button1.FindForm();
   // Set the text and color of the form containing the Button.
   myForm.Text = "The Form of My Control";
   myForm.BackColor = Color.Red;
}

C++

   // This example uses the Parent property and the Find method of Control
 to set
   // properties on the parent control of a Button and its Form. The example
 assumes
   // that a Button control named button1 is located within a GroupBox
 control. The 
   // example also assumes that the Click event of the Button control is
 connected to
   // the event handler method defined in the example.
private:
   void button1_Click( Object^ /*sender*/, System::EventArgs^
 /*e*/ )
   {
      // Get the control the Button control is located in. In this case
 a GroupBox.
      Control^ control = button1->Parent;
      
      // Set the text and backcolor of the parent control.
      control->Text = "My Groupbox";
      control->BackColor = Color::Blue;
      
      // Get the form that the Button control is contained within.
      Form^ myForm = button1->FindForm();
      
      // Set the text and color of the form containing the Button.
      myForm->Text = "The Form of My Control";
      myForm->BackColor = Color::Red;
   }

J#

// This example uses the Parent property and the Find method of Control
 to 
// set properties on the parent control of a Button and its Form. The
 
// example assumes that a Button control named button1 is located within
 a 
// GroupBox control. The example also assumes that the Click event of
 the 
// Button control is connected to the event handler method defined in
 the 
// example.
private void button1_Click(Object sender, System.EventArgs
 e)
{
    // Get the control the Button control is located in. 
    // In this case a GroupBox.
    Control control = button1.get_Parent();

    // Set the text and backcolor of the parent control.
    control.set_Text("My Groupbox");
    control.set_BackColor(Color.get_Blue());

    // Get the form that the Button control is contained within.
    Form myForm = button1.FindForm();

    // Set the text and color of the form containing the Button.
    myForm.set_Text("The Form of My Control");
    myForm.set_BackColor(Color.get_Red());
} //button1_Click

プラットフォーム

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0
.NET Compact Framework
サポート対象 : 2.0、1.0

参照

関連項目
Control クラス
Control メンバ
System.Windows.Forms 名前空間
Click