KeyEventArgs クラス
アセンブリ: System.Windows.Forms (system.windows.forms.dll 内)


各 KeyDown イベントまたは KeyUp イベントに伴い、ユーザーが押したキーおよび同時に任意の修飾子キー (Ctrl、Alt、および Shift) が押されたかどうかを指定する KeyEventArgs が渡されます。
KeyDown イベントは、ユーザーが任意のキーを押すと発生します。KeyUp イベントは、ユーザーが押していたキーを離すと発生します。キーを押し続けている間は、キーが繰り返されるたびに KeyDown イベントが複製され、ユーザーがキーを離すと KeyUp イベントが 1 つだけ生成されます。
キーが押されている間も KeyPress イベントが発生します。各 KeyPress イベントに伴い KeyPressEventArgs が渡され、各キーを押した結果作成される文字を指定します。

' This example demonstrates how to use the KeyDown event with the Help class to display ' pop-up style help to the user of the application. The example filters for all variations ' of pressing the F1 key with a modifier key by using the KeyEventArgs properties passed ' to the event-handler method. ' When the user presses any variation of F1 that includes any keyboard modifier, the Help ' class displays a pop-up window, similar to a ToolTip, near the control. If the user presses ' ALT + F2, a different Help pop-up is displayed with additional information. This example assumes ' that a TextBox control, named textBox1, has been added to the form and its KeyDown ' event has been contected to this event-handler method. Private Sub textBox1_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles textBox1.KeyDown ' Determine whether the key entered is the F1 key. If it is, display Help. If e.KeyCode = Keys.F1 AndAlso (e.Alt OrElse e.Control OrElse e.Shift) Then ' Display a pop-up Help topic to assist the user. Help.ShowPopup(textBox1, "Enter your name.", New Point(textBox1.Bottom, textBox1.Right)) ElseIf e.KeyCode = Keys.F2 AndAlso e.Modifiers = Keys.Alt Then ' Display a pop-up Help topic to provide additional assistance to the user. Help.ShowPopup(textBox1, "Enter your first name followed by your last name. Middle name is optional.", _ New Point(textBox1.Top, Me.textBox1.Left)) End If End Sub 'textBox1_KeyDown
// This example demonstrates how to use the KeyDown event with the Help class to display // pop-up style help to the user of the application. The example filters for all variations // of pressing the F1 key with a modifier key by using the KeyEventArgs properties passed // to the event-handler method. // When the user presses any variation of F1 that includes any keyboard modifier, the Help // class displays a pop-up window, similar to a ToolTip, near the control. If the user presses // ALT + F2, a different Help pop-up is displayed with additional information. This example assumes // that a tTextBox control, named textBox1, has been added to the form and its KeyDown // event has been contected to this event-handler method. private void textBox1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e) { // Determine whether the key entered is the F1 key. If it is, display Help. if(e.KeyCode == Keys.F1 && (e.Alt || e.Control || e.Shift)) { // Display a pop-up Help topic to assist the user. Help.ShowPopup(textBox1, "Enter your name.", new Point(textBox1.Bottom, textBox1.Right)); } else if(e.KeyCode == Keys.F2 && e.Modifiers == Keys.Alt) { // Display a pop-up Help topic to provide additional assistance to the user. Help.ShowPopup(textBox1, "Enter your first name followed by your last name. Middle name is optional.", new Point(textBox1.Top, this.textBox1.Left)); } }
// This example demonstrates how to use the KeyDown event with the Help class to display // pop-up style help to the user of the application. The example filters for all variations // of pressing the F1 key with a modifier key by using the KeyEventArgs properties passed // to the event handling method. // When the user presses any variation of F1 that includes any keyboard modifier, the Help // class displays a pop-up window, similar to a ToolTip, near the control. If the user presses // ALT + F2, a different Help pop-up is displayed with additional information. This example assumes // that a tTextBox control, named textBox1, has been added to the form and its KeyDown // event has been contected to this event handling method. private: void textBox1_KeyDown( Object^ /*sender*/, System::Windows::Forms::KeyEventArgs^ e ) { // Determine whether the key entered is the F1 key. If it is, display Help. if ( e->KeyCode == Keys::F1 && (e->Alt || e->Control || e->Shift) ) { // Display a pop-up Help topic to assist the user. Help::ShowPopup( textBox1, "Enter your name.", Point(textBox1->Bottom,textBox1->Right) ); } else if ( e->KeyCode == Keys::F2 && e->Modifiers == Keys::Alt ) { // Display a pop-up Help topic to provide additional assistance to the user. Help::ShowPopup( textBox1, "Enter your first name followed by your last name. Middle name is optional.", Point(textBox1->Top,this->textBox1->Left) ); } }
// This example demonstrates how to use the KeyDown event with the Help // class to display pop-up style help to the user of the application. // The example filters for all variations of pressing the F1 key with // a modifier key by using the KeyEventArgs properties passed to the // event handling method.When the user presses any variation of F1 that // includes any keyboard modifier, the Help class displays a pop-up window, // similar to a ToolTip, near the control. If the user presses ALT + F2, // a different Help pop-up is displayed with additional information. // This example assumes that a tTextBox control, named textBox1, has been // added to the form and its KeyDown event has been contected to this // event handling method. private void textBox1_KeyDown(Object sender , System.Windows.Forms.KeyEventArgs e) { // Determine whether the key entered is the F1 key. //If it is, display Help. if (e.get_KeyCode().Equals(Keys.F1) && (e.get_Alt() || e.get_Control() || e.get_Shift())) { // Display a pop-up Help topic to assist the user. Help.ShowPopup(textBox1, "Enter your name.", new Point(textBox1. get_Bottom(), textBox1.get_Right())); } else { if (e.get_KeyCode().Equals(Keys.F2) && e.get_Modifiers(). Equals(Keys.Alt)) { // Display a pop-up Help topic to provide additional assistance // to the user. Help.ShowPopup(textBox1, "Enter your first name followed by" + " your last name.Middle name is optional.",new Point( textBox1.get_Top(), this.textBox1.get_Left())); } } } //textBox1_KeyDown } //Form1
Private Sub treeView1_KeyDown(sender As Object, _ e As KeyEventArgs) Handles treeView1.KeyDown ' If the 'Alt' and 'E' keys are pressed, ' allow the user to edit the TreeNode label. If e.Alt And e.KeyCode = Keys.E Then treeView1.LabelEdit = True ' If there is a TreeNode under the mose cursor, begin editing. Dim editNode As TreeNode = treeView1.GetNodeAt( _ treeView1.PointToClient(Control.MousePosition)) If Not (editNode Is Nothing) Then editNode.BeginEdit() End If End If End Sub Private Sub treeView1_AfterLabelEdit(sender As Object, _ e As NodeLabelEditEventArgs) Handles treeView1.AfterLabelEdit ' Disable the ability to edit the TreeNode labels. treeView1.LabelEdit = False End Sub
private void treeView1_KeyDown(object sender, KeyEventArgs e) { /* If the 'Alt' and 'E' keys are pressed, * allow the user to edit the TreeNode label. */ if(e.Alt && e.KeyCode == Keys.E) { treeView1.LabelEdit = true; // If there is a TreeNode under the mose cursor, begin editing. TreeNode editNode = treeView1.GetNodeAt( treeView1.PointToClient(Control.MousePosition)); if(editNode != null) { editNode.BeginEdit(); } } } private void treeView1_AfterLabelEdit(object sender, NodeLabelEditEventArgs e) { // Disable the ability to edit the TreeNode labels. treeView1.LabelEdit = false; }
private: void treeView1_KeyDown( Object^ /*sender*/, KeyEventArgs^ e ) { /* If the 'Alt' and 'E' keys are pressed, * allow the user to edit the TreeNode label. */ if ( e->Alt && e->KeyCode == Keys::E ) { treeView1->LabelEdit = true; // If there is a TreeNode under the mose cursor, begin editing. TreeNode^ editNode = treeView1->GetNodeAt( treeView1->PointToClient( Control::MousePosition ) ); if ( editNode != nullptr ) { editNode->BeginEdit(); } } } void treeView1_AfterLabelEdit( Object^ /*sender*/, NodeLabelEditEventArgs^ /*e*/ ) { // Disable the ability to edit the TreeNode labels. treeView1->LabelEdit = false; }
private void treeView1_KeyDown(Object sender, KeyEventArgs e) { /* If the 'Alt' and 'E' keys are pressed, allow the user to edit the TreeNode label. */ if (e.get_Alt() && e.get_KeyCode() == Keys.E) { treeView1.set_LabelEdit(true); // If there is a TreeNode under the mose cursor, begin editing. TreeNode editNode = treeView1.GetNodeAt(treeView1.PointToClient( Control.get_MousePosition())); if (editNode != null) { editNode.BeginEdit(); } } } //treeView1_KeyDown private void treeView1_AfterLabelEdit(Object sender, NodeLabelEditEventArgs e) { // Disable the ability to edit the TreeNode labels. treeView1.set_LabelEdit(false); } //treeView1_AfterLabelEdit
' Boolean flag used to determine when a character other than a number is entered. Private nonNumberEntered As Boolean = False ' Handle the KeyDown event to determine the type of character entered into the control. Private Sub textBox1_KeyDown(sender As Object, e As System.Windows.Forms.KeyEventArgs) _ Handles textBox1.KeyDown ' Initialize the flag to false. nonNumberEntered = False ' Determine whether the keystroke is a number from the top of the keyboard. If e.KeyCode < Keys.D0 OrElse e.KeyCode > Keys.D9 Then ' Determine whether the keystroke is a number from the keypad. If e.KeyCode < Keys.NumPad0 OrElse e.KeyCode > Keys.NumPad9 Then ' Determine whether the keystroke is a backspace. If e.KeyCode <> Keys.Back Then ' A non-numerical keystroke was pressed. ' Set the flag to true and evaluate in KeyPress event. nonNumberEntered = True End If End If End If End Sub 'textBox1_KeyDown ' This event occurs after the KeyDown event and can be used ' to prevent characters from entering the control. Private Sub textBox1_KeyPress(sender As Object, e As System.Windows.Forms.KeyPressEventArgs) _ Handles textBox1.KeyPress ' Check for the flag being set in the KeyDown event. If nonNumberEntered = True Then ' Stop the character from being entered into the control since it is non-numerical. e.Handled = True End If End Sub 'textBox1_KeyPress End Class 'Form1
// Boolean flag used to determine when a character other than a number is entered. private bool nonNumberEntered = false; // Handle the KeyDown event to determine the type of character entered into the control. private void textBox1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e) { // Initialize the flag to false. nonNumberEntered = false; // Determine whether the keystroke is a number from the top of the keyboard. if (e.KeyCode < Keys.D0 || e.KeyCode > Keys.D9) { // Determine whether the keystroke is a number from the keypad. if (e.KeyCode < Keys.NumPad0 || e.KeyCode > Keys.NumPad9) { // Determine whether the keystroke is a backspace. if(e.KeyCode != Keys.Back) { // A non-numerical keystroke was pressed. // Set the flag to true and evaluate in KeyPress event. nonNumberEntered = true; } } } } // This event occurs after the KeyDown event and can be used to prevent // characters from entering the control. private void textBox1_KeyPress(object sender, System.Windows.Forms.KeyPressEventArgs e) { // Check for the flag being set in the KeyDown event. if (nonNumberEntered == true) { // Stop the character from being entered into the control since it is non-numerical. e.Handled = true; } }
// Boolean flag used to determine when a character other than a number is entered. private: bool nonNumberEntered; // Handle the KeyDown event to determine the type of character entered into the control. void textBox1_KeyDown( Object^ /*sender*/, System::Windows::Forms::KeyEventArgs^ e ) { // Initialize the flag to false. nonNumberEntered = false; // Determine whether the keystroke is a number from the top of the keyboard. if ( e->KeyCode < Keys::D0 || e->KeyCode > Keys::D9 ) { // Determine whether the keystroke is a number from the keypad. if ( e->KeyCode < Keys::NumPad0 || e->KeyCode > Keys::NumPad9 ) { // Determine whether the keystroke is a backspace. if ( e->KeyCode != Keys::Back ) { // A non-numerical keystroke was pressed. // Set the flag to true and evaluate in KeyPress event. nonNumberEntered = true; } } } } // This event occurs after the KeyDown event and can be used to prevent // characters from entering the control. void textBox1_KeyPress( Object^ /*sender*/, System::Windows::Forms::KeyPressEventArgs^ e ) { // Check for the flag being set in the KeyDown event. if ( nonNumberEntered == true ) { // Stop the character from being entered into the control since it is non-numerical. e->Handled = true; } }
// Boolean flag used to determine when a character other than a number // is entered. private boolean nonNumberEntered = false; // Handle the KeyDown event to determine the type of character entered // into the control. private void textBox1_KeyDown(Object sender, System.Windows.Forms.KeyEventArgs e) { // Initialize the flag to false. nonNumberEntered = false; // Determine whether the keystroke is a number from the top of the // keyboard. if ((e.get_KeyCode().CompareTo(Keys.D0)) < 0 || (e.get_KeyCode().CompareTo(Keys.D9) > 0)) { // Determine whether the keystroke is a number from the keypad. if ((e.get_KeyCode().CompareTo(Keys.NumPad0) < 0 || (e.get_KeyCode().CompareTo(Keys.NumPad9)) > 0)) { // Determine whether the keystroke is a backspace. if (!(e.get_KeyCode().Equals(Keys.Back))) { // A non-numerical keystroke was pressed. // Set the flag to true and evaluate in KeyPress event. nonNumberEntered = true; } } } } //textBox1_KeyDown // This event occurs after the KeyDown event and can be used to prevent // characters from entering the control. private void textBox1_KeyPress(Object sender, System.Windows.Forms. KeyPressEventArgs e) { // Check for the flag being set in the KeyDown event. if (nonNumberEntered == true) { // Stop the character from being entered into the control since // it is non-numerical. e.set_Handled(true); } } //textBox1_KeyPress

System.EventArgs
System.Windows.Forms.KeyEventArgs


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
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。


KeyEventArgs メンバ
System.Windows.Forms 名前空間
OnKeyDown
Control.KeyDown イベント
OnKeyUp
Control.KeyUp イベント
KeyPressEventArgs
OnKeyPress
Control.KeyPress イベント
KeyEventArgs コンストラクタ
アセンブリ: System.Windows.Forms (system.windows.forms.dll 内)


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
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。


KeyEventArgs プロパティ


関連項目
KeyEventArgs クラスSystem.Windows.Forms 名前空間
OnKeyDown
Control.KeyDown イベント
OnKeyUp
Control.KeyUp イベント
KeyPressEventArgs
OnKeyPress
Control.KeyPress イベント
KeyEventArgs メソッド

名前 | 説明 | |
---|---|---|
![]() | Equals | オーバーロードされます。 2 つの Object インスタンスが等しいかどうかを判断します。 ( Object から継承されます。) |
![]() | GetHashCode | 特定の型のハッシュ関数として機能します。GetHashCode は、ハッシュ アルゴリズムや、ハッシュ テーブルのようなデータ構造での使用に適しています。 ( Object から継承されます。) |
![]() | GetType | 現在のインスタンスの Type を取得します。 ( Object から継承されます。) |
![]() | ReferenceEquals | 指定した複数の Object インスタンスが同一かどうかを判断します。 ( Object から継承されます。) |
![]() | ToString | 現在の Object を表す String を返します。 ( Object から継承されます。) |

名前 | 説明 | |
---|---|---|
![]() | Finalize | Object がガベージ コレクションにより収集される前に、その Object がリソースを解放し、その他のクリーンアップ操作を実行できるようにします。 ( Object から継承されます。) |
![]() | MemberwiseClone | 現在の Object の簡易コピーを作成します。 ( Object から継承されます。) |

関連項目
KeyEventArgs クラスSystem.Windows.Forms 名前空間
OnKeyDown
Control.KeyDown イベント
OnKeyUp
Control.KeyUp イベント
KeyPressEventArgs
OnKeyPress
Control.KeyPress イベント
KeyEventArgs メンバ
KeyDown イベントまたは KeyUp イベントのデータを提供します。
KeyEventArgs データ型で公開されるメンバを以下の表に示します。



名前 | 説明 | |
---|---|---|
![]() | Equals | オーバーロードされます。 2 つの Object インスタンスが等しいかどうかを判断します。 (Object から継承されます。) |
![]() | GetHashCode | 特定の型のハッシュ関数として機能します。GetHashCode は、ハッシュ アルゴリズムや、ハッシュ テーブルのようなデータ構造での使用に適しています。 (Object から継承されます。) |
![]() | GetType | 現在のインスタンスの Type を取得します。 (Object から継承されます。) |
![]() | ReferenceEquals | 指定した複数の Object インスタンスが同一かどうかを判断します。 (Object から継承されます。) |
![]() | ToString | 現在の Object を表す String を返します。 (Object から継承されます。) |

名前 | 説明 | |
---|---|---|
![]() | Finalize | Object がガベージ コレクションにより収集される前に、その Object がリソースを解放し、その他のクリーンアップ操作を実行できるようにします。 (Object から継承されます。) |
![]() | MemberwiseClone | 現在の Object の簡易コピーを作成します。 (Object から継承されます。) |

関連項目
KeyEventArgs クラスSystem.Windows.Forms 名前空間
OnKeyDown
Control.KeyDown イベント
OnKeyUp
Control.KeyUp イベント
KeyPressEventArgs
OnKeyPress
Control.KeyPress イベント
- KeyEventArgsのページへのリンク