ContainerControl.ValidateChildren メソッド

定義

検証をサポートするコントロールに含まれるすべての子コントロールでデータを検証します。Causes all of the child controls within a control that support validation to validate their data.

オーバーロード

ValidateChildren()

検証をサポートするコントロールに含まれるすべての子コントロールでデータを検証します。Causes all of the child controls within a control that support validation to validate their data.

ValidateChildren(ValidationConstraints)

検証をサポートするコントロールに含まれるすべての子コントロールでデータを検証します。Causes all of the child controls within a control that support validation to validate their data.

ValidateChildren()

検証をサポートするコントロールに含まれるすべての子コントロールでデータを検証します。Causes all of the child controls within a control that support validation to validate their data.

public:
 virtual bool ValidateChildren();
[System.ComponentModel.Browsable(false)]
public virtual bool ValidateChildren ();
abstract member ValidateChildren : unit -> bool
override this.ValidateChildren : unit -> bool
Public Overridable Function ValidateChildren () As Boolean

戻り値

Boolean

すべての子の検証が正常に実行された場合は true、それ以外の場合は falsetrue if all of the children validated successfully; otherwise, false. このメソッドは、Validating イベント ハンドラーまたは Validated イベント ハンドラーから呼び出された場合、常に false を返します。If called from the Validating or Validated event handlers, this method will always return false.

属性

次のコード例では、フォームとそれに含まれるすべてのコントロールの暗黙的な検証を無効にし、マウスボタンがクリックされたときに、フォームのすべての子の検証を手動で実行します。The following code example turns off implicit validation for a form and all of its contained controls, and instead manually performs validation of all of the form's children when a mouse button is clicked.

using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Drawing;
using System.Text;

namespace TestValidation
{
    class Form1 : Form
    {
        private static void Main(string[] args)
        {
            Application.EnableVisualStyles();
            Application.Run(new Form1());
        }

        private TextBox firstNameBox, lastNameBox;
        private Button validateButton;
        private FlowLayoutPanel flowLayout1;

        private Form1()
        {
            this.Load += new EventHandler(Form1_Load);
        }

        void Form1_Load(object sender, EventArgs e)
        {
            // Turn off validation when a control loses focus. This will be inherited by child
            // controls on the form, enabling us to validate the entire form when the 
            // button is clicked instead of one control at a time.
            this.AutoValidate = AutoValidate.Disable;

            flowLayout1 = new FlowLayoutPanel();
            flowLayout1.Dock = DockStyle.Fill;
            flowLayout1.Name = "flowLayout1";

            firstNameBox = new TextBox();
            firstNameBox.Name = "firstNameBox";
            firstNameBox.Size = new Size(75, firstNameBox.Size.Height);
            firstNameBox.CausesValidation = true;
            firstNameBox.Validating += new System.ComponentModel.CancelEventHandler(firstNameBox_Validating);
            flowLayout1.Controls.Add(firstNameBox);

            lastNameBox = new TextBox();
            lastNameBox.Name = "lastNameBox";
            lastNameBox.Size = new Size(75, lastNameBox.Size.Height);
            lastNameBox.CausesValidation = true;
            lastNameBox.Validating += new System.ComponentModel.CancelEventHandler(lastNameBox_Validating);
            flowLayout1.Controls.Add(lastNameBox);

            validateButton = new Button();
            validateButton.Text = "Validate";
            // validateButton.Location = new Point(170, 10);
            validateButton.Size = new Size(75, validateButton.Size.Height);
            validateButton.Click += new EventHandler(validateButton_Click);
            flowLayout1.Controls.Add(validateButton);

            this.Controls.Add(flowLayout1);

            this.Text = "Test Validation";
        }

        void firstNameBox_Validating(object sender, System.ComponentModel.CancelEventArgs e)
        {
            if (firstNameBox.Text.Length == 0)
            {
                e.Cancel = true;
            }
            else
            {
                e.Cancel = false;
            }
        }

        void lastNameBox_Validating(object sender, System.ComponentModel.CancelEventArgs e)
        {
            e.Cancel = false;
        }

        void validateButton_Click(object sender, EventArgs e)
        {
            if (this.ValidateChildren())
            {
                MessageBox.Show("Validation succeeded!");
            }
            else
            {
                MessageBox.Show("Validation failed.");
            }
        }
    }
}
Imports System.Drawing
Imports System.Windows.Forms

Public Class Form1
    Inherits Form

    'Entry point which delegates to C-style main Private Function
    Public Overloads Shared Sub Main()
        Main(System.Environment.GetCommandLineArgs())
    End Sub

    Private Overloads Shared Sub Main(ByVal args() As String)
        Application.EnableVisualStyles()
        Application.Run(New Form1())
    End Sub

    Private WithEvents FirstNameBox, LastNameBox As TextBox
    Private WithEvents ValidateButton As Button
    Private FlowLayout1 As FlowLayoutPanel

    Private Sub New()
    End Sub

    Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
        ' Turn off validation when a control loses focus. This will be inherited by child
        ' controls on the form, enabling us to validate the entire form when the 
        ' button is clicked instead of one control at a time.
        Me.AutoValidate = System.Windows.Forms.AutoValidate.Disable

        FlowLayout1 = New FlowLayoutPanel()
        FlowLayout1.Dock = DockStyle.Fill

        FirstNameBox = New TextBox()
        FirstNameBox.Name = "FirstNameBox"
        FirstNameBox.Location = New Point(10, 10)
        FirstNameBox.Size = New Size(75, FirstNameBox.Size.Height)
        FirstNameBox.CausesValidation = True
        FlowLayout1.Controls.Add(FirstNameBox)

        LastNameBox = New TextBox()
        LastNameBox.Name = "LastNameBox"
        LastNameBox.Location = New Point(90, 10)
        LastNameBox.Size = New Size(75, LastNameBox.Size.Height)
        LastNameBox.CausesValidation = True
        FlowLayout1.Controls.Add(LastNameBox)

        ValidateButton = New Button()
        ValidateButton.Text = "Validate"
        ValidateButton.Location = New Point(170, 10)
        ValidateButton.Size = New Size(75, ValidateButton.Size.Height)
        FlowLayout1.Controls.Add(ValidateButton)

        Me.Text = "Test Validation"

        Me.Controls.Add(FlowLayout1)
    End Sub


    Private Sub FirstNameBox_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles FirstNameBox.Validating
        If FirstNameBox.Text.Length = 0 Then
            e.Cancel = True
        Else
            e.Cancel = False
        End If
    End Sub


    Private Sub LastNameBox_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles LastNameBox.Validating
        e.Cancel = False
    End Sub


    Private Sub ValidateButton_Click(ByVal sender As Object, ByVal e As EventArgs) Handles ValidateButton.Click
        If ValidateChildren() Then
            MessageBox.Show("Validation succeeded!")
        Else
            MessageBox.Show("Validation failed.")
        End If
    End Sub
End Class

注釈

ValidateChildren によってコントロールの階層が表示され、各コントロールが検証をサポートしているかどうかが確認されます。ValidateChildren will descend a control's hierarchy and examine each control to see if it supports validation. ユーザーがコントロールを選択でき、その CausesValidation プロパティが true場合、ValidateChildren によって Validating イベントが発生します。If the control can be selected by the user and its CausesValidation property is true, ValidateChildren will cause the Validating event to occur. いずれかのコントロールが Validating イベントをキャンセルした場合、このメソッドは falseを返します。それ以外の場合は trueを返します。If any of the controls cancel the Validating event, this method will return false; otherwise, it will return true.

コントロールがデータソースにバインドされていて、Validating イベントが発生した場合は、コントロールによって現在のデータがデータソースにプッシュされます。If a control is bound to a data source, and the Validating event occurs, it will cause the control to push its current data back to the data source.

ValidateChildren を呼び出すことは、NoneValidationConstraintsValidateChildren を呼び出すことと同じです。Calling ValidateChildren is equivalent to calling ValidateChildren with a ValidationConstraints of None.

ValidateChildren(ValidationConstraints)

検証をサポートするコントロールに含まれるすべての子コントロールでデータを検証します。Causes all of the child controls within a control that support validation to validate their data.

public:
 virtual bool ValidateChildren(System::Windows::Forms::ValidationConstraints validationConstraints);
[System.ComponentModel.Browsable(false)]
public virtual bool ValidateChildren (System.Windows.Forms.ValidationConstraints validationConstraints);
abstract member ValidateChildren : System.Windows.Forms.ValidationConstraints -> bool
override this.ValidateChildren : System.Windows.Forms.ValidationConstraints -> bool
Public Overridable Function ValidateChildren (validationConstraints As ValidationConstraints) As Boolean

パラメーター

validationConstraints
ValidationConstraints

どのコントロールで Validating イベントを発生させるかについて制限を設定します。Places restrictions on which controls have their Validating event raised.

戻り値

Boolean

すべての子の検証が正常に実行された場合は true、それ以外の場合は falsetrue if all of the children validated successfully; otherwise, false. このメソッドは、Validating イベント ハンドラーまたは Validated イベント ハンドラーから呼び出された場合、常に false を返します。If called from the Validating or Validated event handlers, this method will always return false.

属性

次のコード例では、Enabled プロパティが trueされているフォームの直接の子に対してのみ、Validating イベントが発生します。The following code example will only cause the Validating event to occur for immediate children of the form whose Enabled property is true.

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Windows.Forms;

namespace ValidateChildrenWithConstraints
{
    class Form1 : Form
    {
        public static void Main(string[] args)
        {
            Application.EnableVisualStyles();
            Application.Run(new Form1());
        }

        private Form1()
        {
            this.Load += new EventHandler(Form1_Load);
        }

        void Form1_Load(object sender, EventArgs e)
        {
            // Create controls on form.
            TextBox textBox1, textBox2, textBox3;
            FlowLayoutPanel flowPanel1;
            TextBox subTextBox1;
            Button button1;

            this.Size = new Size(500, 300);
            this.AutoValidate = AutoValidate.Disable;

            textBox1 = new TextBox();
            textBox1.Location = new Point(20, 20);
            textBox1.Size = new Size(75, textBox1.Size.Height);
            textBox1.CausesValidation = true;
            textBox1.Validating += new System.ComponentModel.CancelEventHandler(textBox1_Validating);
            this.Controls.Add(textBox1);

            textBox2 = new TextBox();
            textBox2.Location = new Point(105, 20);
            textBox2.Size = new Size(75, textBox2.Size.Height);
            textBox2.CausesValidation = true;
            textBox2.Validating += new System.ComponentModel.CancelEventHandler(textBox2_Validating);
            this.Controls.Add(textBox2);

            textBox3 = new TextBox();
            textBox3.Location = new Point(190, 20);
            textBox3.Size = new Size(75, textBox3.Size.Height);
            textBox3.Enabled = false;
            textBox3.CausesValidation = true;
            textBox3.Validating += new System.ComponentModel.CancelEventHandler(textBox3_Validating);
            this.Controls.Add(textBox3);

            button1 = new Button();
            button1.Text = "Click";
            button1.Location = new Point(270, 20);
            button1.Click += new EventHandler(button1_Click);
            this.Controls.Add(button1);

            flowPanel1 = new FlowLayoutPanel();
            flowPanel1.Size = new Size(400, 100);
            flowPanel1.Dock = DockStyle.Bottom;
            subTextBox1 = new TextBox();
            subTextBox1.CausesValidation = true;
            subTextBox1.Validating += new System.ComponentModel.CancelEventHandler(subTextBox1_Validating);
            flowPanel1.Controls.Add(subTextBox1);
            this.Controls.Add(flowPanel1);
        }

        void subTextBox1_Validating(object sender, System.ComponentModel.CancelEventArgs e)
        {
            MessageBox.Show("subTextBox1 Validating!");
        }

        void textBox1_Validating(object sender, System.ComponentModel.CancelEventArgs e)
        {
            MessageBox.Show("textBox1 Validating!");
        }

        void textBox2_Validating(object sender, System.ComponentModel.CancelEventArgs e)
        {
            MessageBox.Show("textBox2 Validating!");
        }

        void textBox3_Validating(object sender, System.ComponentModel.CancelEventArgs e)
        {
            MessageBox.Show("textBox3 Validating!");
        }

        void button1_Click(object sender, EventArgs e)
        {
            this.ValidateChildren(ValidationConstraints.ImmediateChildren | ValidationConstraints.Enabled);
        }
    }
}
Imports System.Drawing
Imports System.Windows.Forms

Namespace ValidateChildrenWithConstraints
    _
    Class Form1
        Inherits Form

        Public Overloads Shared Sub Main(ByVal args() As String)
            Application.EnableVisualStyles()
            Application.Run(New Form1())
        End Sub

        Private Sub New()
            AddHandler Me.Load, AddressOf Form1_Load
        End Sub

        Dim WithEvents TextBox1, TextBox2, TextBox3 As TextBox
        Dim FlowPanel1 As FlowLayoutPanel
        Dim WithEvents SubTextBox1 As TextBox
        Dim WithEvents Button1 As Button

        Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
            ' Create controls on form.

            Me.Size = New Size(500, 300)
            Me.AutoValidate = AutoValidate.Disable

            TextBox1 = New TextBox()
            TextBox1.Location = New Point(20, 20)
            TextBox1.Size = New Size(75, TextBox1.Size.Height)
            TextBox1.CausesValidation = True
            Me.Controls.Add(TextBox1)

            TextBox2 = New TextBox()
            TextBox2.Location = New Point(105, 20)
            TextBox2.Size = New Size(75, TextBox2.Size.Height)
            TextBox2.CausesValidation = True
            Me.Controls.Add(TextBox2)

            TextBox3 = New TextBox()
            TextBox3.Location = New Point(190, 20)
            TextBox3.Size = New Size(75, TextBox3.Size.Height)
            TextBox3.Enabled = False
            TextBox3.CausesValidation = True
            Me.Controls.Add(TextBox3)

            Button1 = New Button()
            Button1.Text = "Click"
            Button1.Location = New Point(270, 20)
            Me.Controls.Add(Button1)

            FlowPanel1 = New FlowLayoutPanel()
            FlowPanel1.Size = New Size(400, 100)
            FlowPanel1.Dock = DockStyle.Bottom
            SubTextBox1 = New TextBox()
            SubTextBox1.CausesValidation = True
            FlowPanel1.Controls.Add(SubTextBox1)
            Me.Controls.Add(FlowPanel1)
        End Sub


        Sub SubTextBox1_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles SubTextBox1.Validating
            MessageBox.Show("SubTextBox1 Validating!")
        End Sub


        Sub TextBox1_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles TextBox1.Validating
            MessageBox.Show("TextBox1 Validating!")
        End Sub


        Sub TextBox2_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles TextBox2.Validating
            MessageBox.Show("TextBox2 Validating!")
        End Sub


        Sub TextBox3_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles TextBox3.Validating
            MessageBox.Show("TextBox3 Validating!")
        End Sub


        Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles button1.Click
            Me.ValidateChildren((ValidationConstraints.ImmediateChildren Or ValidationConstraints.Enabled))
        End Sub
    End Class
End Namespace 'ValidateChildrenWithConstraints

注釈

ValidateChildren は、現在のコントロールのすべての子を調べ、ValidationConstraintsによってスペルチェックされた条件を満たす場合に、Validating イベントがコントロールで発生するようにします。ValidateChildren will examine all the children of the current control, causing the Validating event to occur on a control if it meets the criteria spelled out by ValidationConstraints.

複数の ValidationConstraints パラメーターを、ビットごとの OR 演算子と組み合わせて使用することもできます。You may use several ValidationConstraints parameters at once by combining them with a bitwise OR operator. パラメーターをビットごとの OR 演算子と組み合わせると、論理 AND 演算になります。Combining parameters with a bitwise OR operator will result in a logical AND operation. たとえば、ValidateChildren(ValidationConstraints.ImmediateChildren | ValidationConstraints.Enabled) を呼び出すと、コンテナーの直下の子であり、かつ有効になっているコントロールに対してのみ、Validating イベントが発生します。For example, calling ValidateChildren(ValidationConstraints.ImmediateChildren | ValidationConstraints.Enabled) will only raise the Validating event on controls that are both immediate children of the container AND are enabled.

このメソッドに指定するパラメーターに関係なく、コントロールの CausesValidation プロパティを true に設定して、その Validating イベントを発生させる必要があります。Regardless of which parameters you specify for this method, a control must have its CausesValidation property set to true in order for its Validating event to occur. また、ユーザーがコントロールからフォーカスを移動したときではなく、ValidateChildrenを呼び出したときにのみ検証を実行する場合は、コントロールまたはコントロールのコンテナーの AutoValidate プロパティを false に設定する必要があります。You should also set the AutoValidate property of the control or of the control's container to false if you want validation to happen only when you call ValidateChildren, and not when the user shifts focus from the control.

コントロールがデータソースにバインドされていて、Validating イベントが発生した場合は、コントロールによって現在のデータがデータソースにプッシュされます。If a control is bound to a data source, and the Validating event occurs, it will cause the control to push its current data back to the data source.

ビットごとの否定演算子を適用することによって、ValidationConstraints パラメーターの反対の効果を実現することはできません。You cannot achieve the opposite effect of a ValidationConstraints parameter by applying a bitwise negation operator. たとえば、Visible フィールドの負の値を ValidateChildrenに指定した場合、コンテナーに表示されていないすべての子は検証されません。For example, if you supply the negative value of the Visible field to ValidateChildren, it will not validate all children that are not visible on the container. ValidateChildren に負のパラメーターを指定しても、コンテナーまたはその子には影響しません。Supplying any negative parameter to ValidateChildren will have no effect on the container or its children.

適用対象