Control.CausesValidation プロパティとは何？わかりやすく解説 Weblio辞書

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.NET Framework クラスライブラリリファレンス

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Control.CausesValidation プロパティ

そのコントロールが原因で、フォーカスを受け取ると検証が必要なコントロールに対して、検証が実行されるかどうかを示す値を取得または設定します。

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)

Public Property CausesValidation As
 Boolean

Visual Basic (使用法)

Dim instance As Control
Dim value As Boolean

value = instance.CausesValidation

instance.CausesValidation = value

public bool CausesValidation { get;
 set; }

C++

public:
property bool CausesValidation {
    bool get ();
    void set (bool value);
}

/** @property */
public boolean get_CausesValidation ()

/** @property */
public void set_CausesValidation (boolean value)

JScript

public function get CausesValidation
 () : boolean

public function set CausesValidation
 (value : boolean)

プロパティ値
そのコントロールが原因で、フォーカスを受け取ると検証が必要なコントロールに対して検証が実行される場合は true。それ以外の場合は false。既定値は true です。

解説

CausesValidation プロパティが false に設定されている場合、Validating イベントおよび Validated イベントは発生しません。

CausesValidation プロパティ値は、通常、[ヘルプ] ボタンなどのコントロールに対して false に設定されます。

使用例

テキストボックスに入力された数値を加算する Windows フォームを作成するコード例を次に示します。結果を表示する前にテキストボックスが検証されます。

Visual Basic

Private Sub AddHandlers()
    ' Add the Validating and Validated handlers for textboxes.
    AddHandler myTextBox1.Validating, AddressOf
 myTextBox1_Validating
    AddHandler myTextBox1.Validated, AddressOf
 myTextBox1_Validated
    AddHandler myTextBox2.Validating, AddressOf
 myTextBox2_Validating
    AddHandler myTextBox2.Validated, AddressOf
 myTextBox2_Validated
    AddHandler myTextBox1.CausesValidationChanged, AddressOf
 myTextBox1_CausesValidationChanged
    AddHandler myTextBox2.CausesValidationChanged, AddressOf
 myTextBox2_CausesValidationChanged
    If myTextBox1.CausesValidation = True And
 myTextBox2.CausesValidation = True Then
       button1.Text = "Disable Validation"
       myLabel.Text = "Validation Enabled"
       Me.Focus()
    End If
End Sub 'AddHandlers
 
Private Sub myTextBox1_Validating(sender As
 Object, e As System.ComponentModel.CancelEventArgs)
    If Not CheckIfTextBoxNumeric(myTextBox1)
 Then
       myLabel.Text = "Has to be numeric"
       e.Cancel = True
    End If
End Sub 'myTextBox1_Validating
 
Private Sub myTextBox1_Validated(sender As
 Object, e As System.EventArgs)
    myLabel.Text = "Validated first control"
End Sub 'myTextBox1_Validated
 
Private Sub myTextBox2_Validating(sender As
 Object, e As System.ComponentModel.CancelEventArgs)
    If Not CheckIfTextBoxNumeric(myTextBox2)
 Then
       myLabel.Text = "Has to be numeric"
       e.Cancel = True
    End If
End Sub 'myTextBox2_Validating
 
Private Sub myTextBox2_Validated(sender As
 Object, e As System.EventArgs)
    myLabel.Text = "Validated second control"
End Sub 'myTextBox2_Validated
 
Private Sub myTextBox1_CausesValidationChanged(sender
 As Object, e As System.EventArgs)
    myLabel.Text = "CausesValidation property was changed for
 First Textbox"
End Sub 'myTextBox1_CausesValidationChanged
 
Private Sub myTextBox2_CausesValidationChanged(sender
 As Object, e As System.EventArgs)
    myLabel.Text = "CausesValidation property was changed for
 Second Textbox"
End Sub 'myTextBox2_CausesValidationChanged
 
Private Function CheckIfTextBoxNumeric(myTextBox1
 As TextBox) As Boolean
    Dim isValid As Boolean
 = True
    If myTextBox1.Text = "" Then
       isValid = False
    Else
       Dim i As Integer
       For i = 0 To myTextBox1.Text.Length
 - 1
          If Not IsNumeric(myTextBox1.Text)
 Then
             myTextBox1.Text = ""
             isValid = False
             Exit For
          End If
       Next i
    End If
    Return isValid
End Function 'CheckIfTextBoxNumeric
 
Private Sub myButtonAdd_Click(sender As
 Object, e As System.EventArgs) Handles
 myButtonAdd.Click
   Try
      Dim result As Integer
 = Convert.ToInt32(myTextBox1.Text) + Convert.ToInt32(myTextBox2.Text)
       myLabel.Text = result.ToString()
    Catch myException As Exception
       myLabel.Text = "Exception : " + myException.Message
    End Try
End Sub 'myButtonAdd_Click
 
 
Private Sub button1_Click(sender As
 Object, e As System.EventArgs) Handles
 button1.Click
    If myTextBox1.CausesValidation = False
 And myTextBox2.CausesValidation = False Then
       myTextBox1.CausesValidation = True
       myTextBox2.CausesValidation = True
       button1.Text = "Disable Validation"
       myLabel.Text = "Validation Enabled"
    Else
       If myTextBox1.CausesValidation = True And
 myTextBox2.CausesValidation = True Then
          myTextBox1.CausesValidation = False
          myTextBox2.CausesValidation = False
          button1.Text = "Enable Validation"
          myLabel.Text = "Validation Disabled"
       End If
    End If
End Sub 'button1_Click

private void AddHandlers()
{
   // Add the Validating and Validated handlers for textboxes.
   myTextBox1.Validating +=
      new System.ComponentModel.CancelEventHandler(myTextBox1_Validating);
   myTextBox1.Validated += 
      new System.EventHandler(myTextBox1_Validated);
   myTextBox2.Validating += 
      new System.ComponentModel.CancelEventHandler(myTextBox2_Validating);
   myTextBox2.Validated += 
      new System.EventHandler(myTextBox2_Validated);
   myTextBox1.CausesValidationChanged += 
      new System.EventHandler(myTextBox1_CausesValidationChanged);
   myTextBox2.CausesValidationChanged += 
      new System.EventHandler(myTextBox2_CausesValidationChanged);
   if(myTextBox1.CausesValidation == true &&
 myTextBox2.CausesValidation == true) 
   {
      button1.Text = "Disable Validation";
      myLabel.Text = "Validation Enabled"; 
      this.Focus(); 
   }
}
private void myTextBox1_Validating(object sender,System.ComponentModel.CancelEventArgs
 e)
{        
   if(!CheckIfTextBoxNumeric(myTextBox1))
   {
      myLabel.Text =  "Has to be numeric";
      e.Cancel = true;
   }
}
private void myTextBox1_Validated(object sender,System.EventArgs
 e)
{
   myLabel.Text = "Validated first control";          
}
private void myTextBox2_Validating(object sender,System.ComponentModel.CancelEventArgs
 e)
{
   if(!CheckIfTextBoxNumeric(myTextBox2))
   {
      myLabel.Text =  "Has to be numeric";
      e.Cancel = true;
   }
}
private void myTextBox2_Validated(object sender,System.EventArgs
 e)
{
   myLabel.Text = "Validated second control";
}
private void myTextBox1_CausesValidationChanged(object
 sender,System.EventArgs e)
{  
   myLabel.Text = "CausesValidation property was changed for
 First Textbox";
}
private void myTextBox2_CausesValidationChanged(object
 sender,System.EventArgs e)
{  
   myLabel.Text = "CausesValidation property was changed for
 Second Textbox";
}
private bool CheckIfTextBoxNumeric(TextBox
 myTextBox1)
{ 
   bool isValid = true;
   if(myTextBox1.Text == "")
   {
      isValid = false;
   }
   else
   {
      for(int i=0; i< myTextBox1.Text.Length;i++)
      {
         if(!(System.Char.IsNumber(myTextBox1.Text[i]))) 
         {
            myTextBox1.Text = ""; 
            isValid = false;
            break;
         }
      }
   }
   return isValid;
}
private void myButtonAdd_Click(object sender,
 System.EventArgs e)
{  
   try
   {
      int result = Convert.ToInt32(myTextBox1.Text) + Convert.ToInt32(myTextBox2.Text);
      myLabel.Text =  result.ToString();
   }
   catch(Exception myException)
   {
      myLabel.Text = "Exception : " + myException.Message;
   }
}

private void button1_Click(object sender, System.EventArgs
 e)
{  
   if(myTextBox1.CausesValidation == false
 && myTextBox2.CausesValidation == false) 
   {
      myTextBox1.CausesValidation = true;
      myTextBox2.CausesValidation = true;
      button1.Text = "Disable Validation"; 
      myLabel.Text = "Validation Enabled"; 
   }
   else if(myTextBox1.CausesValidation == true
 && myTextBox2.CausesValidation == true) 
   {
      myTextBox1.CausesValidation = false;
      myTextBox2.CausesValidation = false;
      button1.Text = "Enable Validation"; 
      myLabel.Text = "Validation Disabled"; 
   }
}

C++

private:
   void AddHandlers()
   {
      
      // Add the Validating and Validated handlers for textboxes.
      myTextBox1->Validating += gcnew System::ComponentModel::CancelEventHandler(
 this, &Form1::myTextBox1_Validating );
      myTextBox1->Validated += gcnew System::EventHandler( this,
 &Form1::myTextBox1_Validated );
      myTextBox2->Validating += gcnew System::ComponentModel::CancelEventHandler(
 this, &Form1::myTextBox2_Validating );
      myTextBox2->Validated += gcnew System::EventHandler( this,
 &Form1::myTextBox2_Validated );
      myTextBox1->CausesValidationChanged += gcnew System::EventHandler( this,
 &Form1::myTextBox1_CausesValidationChanged );
      myTextBox2->CausesValidationChanged += gcnew System::EventHandler( this,
 &Form1::myTextBox2_CausesValidationChanged );
      if ( myTextBox1->CausesValidation == true
 && myTextBox2->CausesValidation == true )
      {
         button1->Text = "Disable Validation";
         myLabel->Text = "Validation Enabled";
         this->Focus();
      }
   }

   void myTextBox1_Validating( Object^ /*sender*/, System::ComponentModel::CancelEventArgs^
 e )
   {
      if (  !CheckIfTextBoxNumeric( myTextBox1 ) )
      {
         myLabel->Text = "Has to be numeric";
         e->Cancel = true;
      }
   }

   void myTextBox1_Validated( Object^ /*sender*/, System::EventArgs^
 /*e*/ )
   {
      myLabel->Text = "Validated first control";
   }

   void myTextBox2_Validating( Object^ /*sender*/, System::ComponentModel::CancelEventArgs^
 e )
   {
      if (  !CheckIfTextBoxNumeric( myTextBox2 ) )
      {
         myLabel->Text = "Has to be numeric";
         e->Cancel = true;
      }
   }

   void myTextBox2_Validated( Object^ /*sender*/, System::EventArgs^
 /*e*/ )
   {
      myLabel->Text = "Validated second control";
   }

   void myTextBox1_CausesValidationChanged( Object^ /*sender*/,
 System::EventArgs^ /*e*/ )
   {
      myLabel->Text = "CausesValidation property was changed for
 First Textbox";
   }

   void myTextBox2_CausesValidationChanged( Object^ /*sender*/,
 System::EventArgs^ /*e*/ )
   {
      myLabel->Text = "CausesValidation property was changed for
 Second Textbox";
   }

   bool CheckIfTextBoxNumeric( TextBox^ myTextBox1 )
   {
      bool isValid = true;
      if ( myTextBox1->Text->Equals( "" ) )
      {
         isValid = false;
      }
      else
      {
         for ( int i = 0; i < myTextBox1->Text->Length;
 i++ )
         {
            if (  !(System::Char::IsNumber( myTextBox1->Text[
 i ] )) )
            {
               myTextBox1->Text = "";
               isValid = false;
               break;
            }

         }
      }

      return isValid;
   }

   void myButtonAdd_Click( Object^ /*sender*/, System::EventArgs^
 /*e*/ )
   {
      try
      {
         int result = Convert::ToInt32( myTextBox1->Text )
 + Convert::ToInt32( myTextBox2->Text );
         myLabel->Text = result.ToString();
      }
      catch ( Exception^ myException ) 
      {
         myLabel->Text = "Exception : ",myException->Message;
      }

   }

   void button1_Click( Object^ /*sender*/, System::EventArgs^
 /*e*/ )
   {
      if ( myTextBox1->CausesValidation == false
 && myTextBox2->CausesValidation == false )
      {
         myTextBox1->CausesValidation = true;
         myTextBox2->CausesValidation = true;
         button1->Text = "Disable Validation";
         myLabel->Text = "Validation Enabled";
      }
      else
      if ( myTextBox1->CausesValidation == true
 && myTextBox2->CausesValidation == true )
      {
         myTextBox1->CausesValidation = false;
         myTextBox2->CausesValidation = false;
         button1->Text = "Enable Validation";
         myLabel->Text = "Validation Disabled";
      }
   }

private void AddHandlers()
{
    // Add the Validating and Validated handlers for textboxes.
    myTextBox1.add_Validating(new System.ComponentModel.
        CancelEventHandler(myTextBox1_Validating));
    myTextBox1.add_Validated(new System.EventHandler(myTextBox1_Validated));
    myTextBox2.add_Validating(new System.ComponentModel.
        CancelEventHandler(myTextBox2_Validating));
    myTextBox2.add_Validated(new System.EventHandler(myTextBox2_Validated));
    myTextBox1.add_CausesValidationChanged(new System.
        EventHandler(myTextBox1_CausesValidationChanged));
    myTextBox2.add_CausesValidationChanged(new System.
        EventHandler(myTextBox2_CausesValidationChanged));
    if (myTextBox1.get_CausesValidation() == true
 && myTextBox2.
        get_CausesValidation() == true) {
        button1.set_Text("Disable Validation");
        myLabel.set_Text("Validation Enabled");
        this.Focus();
    }
} //AddHandlers

private void myTextBox1_Validating(Object sender,
 
    System.ComponentModel.CancelEventArgs e)
{
    if (!(CheckIfTextBoxNumeric(myTextBox1))) {
        myLabel.set_Text("Has to be numeric");
        e.set_Cancel(true);
    }
} //myTextBox1_Validating

private void myTextBox1_Validated(Object sender,
 
    System.EventArgs e)
{
    myLabel.set_Text("Validated first control");
} //myTextBox1_Validated

private void myTextBox2_Validating(Object sender,
 
    System.ComponentModel.CancelEventArgs e)
{
    if (!(CheckIfTextBoxNumeric(myTextBox2))) {
        myLabel.set_Text("Has to be numeric");
        e.set_Cancel(true);
    }
} //myTextBox2_Validating

private void myTextBox2_Validated(Object sender,
 System.EventArgs e)
{
    myLabel.set_Text("Validated second control");
} //myTextBox2_Validated

private void myTextBox1_CausesValidationChanged(Object
 sender, 
    System.EventArgs e)
{
    myLabel.set_Text("CausesValidation property was changed for
 "
        + "First Textbox");
} //myTextBox1_CausesValidationChanged

private void myTextBox2_CausesValidationChanged(Object
 sender, 
    System.EventArgs e)
{
    myLabel.set_Text("CausesValidation property was changed for
 "
        + "Second Textbox");
} //myTextBox2_CausesValidationChanged

private boolean CheckIfTextBoxNumeric(TextBox myTextBox1)
{
    boolean isValid = true;
    if (myTextBox1.get_Text().Equals("")) {
        isValid = false;
    }
    else {
        for (int i = 0; i < myTextBox1.get_Text().get_Length();
 i++) {
            if (!(System.Char.IsNumber(myTextBox1.get_Text().
                get_Chars(i)))) {
                myTextBox1.set_Text("");
                isValid = false;
                break;
            }
        }
    }
    return isValid;
} //CheckIfTextBoxNumeric

private void myButtonAdd_Click(Object sender,
 System.EventArgs e)
{
    try {
        int result = Convert.ToInt32(myTextBox1.get_Text()) 
            + Convert.ToInt32(myTextBox2.get_Text());
        myLabel.set_Text(System.Convert.ToString(result));
    }
    catch (System.Exception myException) {
        myLabel.set_Text("Exception : " + myException.get_Message());
    }
} //myButtonAdd_Click

private void button1_Click(Object sender, System.EventArgs
 e)
{
    if (myTextBox1.get_CausesValidation() == false
 && myTextBox2.
        get_CausesValidation() == false) {
        myTextBox1.set_CausesValidation(true);
        myTextBox2.set_CausesValidation(true);
        button1.set_Text("Disable Validation");
        myLabel.set_Text("Validation Enabled");
    }
    else {
        if (myTextBox1.get_CausesValidation() == true
 && myTextBox2.
            get_CausesValidation() == true) {
            myTextBox1.set_CausesValidation(false);
            myTextBox2.set_CausesValidation(false);
            button1.set_Text("Enable Validation");
            myLabel.set_Text("Validation Disabled");
        }
    }
} //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 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。

バージョン情報

.NET Framework
サポート対象 : 2.0、1.1、1.0

参照

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

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