ContainerControl.ValidateChildren Methode

Definition

Bewirkt, dass alle untergeordneten Steuerelemente in einem Steuerelement, die die Validierung unterstützen, ihre Daten validieren.Causes all of the child controls within a control that support validation to validate their data.

Überlädt

ValidateChildren()

Bewirkt, dass alle untergeordneten Steuerelemente in einem Steuerelement, die die Validierung unterstützen, ihre Daten validieren.Causes all of the child controls within a control that support validation to validate their data.

ValidateChildren(ValidationConstraints)

Bewirkt, dass alle untergeordneten Steuerelemente in einem Steuerelement, die die Validierung unterstützen, ihre Daten validieren.Causes all of the child controls within a control that support validation to validate their data.

ValidateChildren()

Bewirkt, dass alle untergeordneten Steuerelemente in einem Steuerelement, die die Validierung unterstützen, ihre Daten validieren.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

Gibt zurück

true, wenn alle untergeordneten Elemente erfolgreich validiert wurden, andernfalls false.true if all of the children validated successfully; otherwise, false. Wenn sie vom Validating-Ereignishandler oder vom Validated-Ereignishandler aufgerufen wird, gibt diese Methode immer false zurück.If called from the Validating or Validated event handlers, this method will always return false.

Attribute

Beispiele

Im folgenden Codebeispiel wird die implizite Validierung für ein Formular und alle darin enthaltenen Steuerelemente deaktiviert. stattdessen wird die Überprüfung aller untergeordneten Formulare manuell durchführt, wenn auf eine Maustaste geklickt wird.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

Hinweise

ValidateChildren wird die Hierarchie eines Steuer Elements herabsteigen und jedes Steuerelement untersuchen, um festzustellen, ob es die ValidierungValidateChildren will descend a control's hierarchy and examine each control to see if it supports validation. Wenn das Steuerelement vom Benutzer ausgewählt werden kann und dessen CausesValidation-Eigenschaft trueist, bewirkt ValidateChildren, dass das Validating Ereignis auftritt.If the control can be selected by the user and its CausesValidation property is true, ValidateChildren will cause the Validating event to occur. Wenn eines der Steuerelemente das Validating Ereignis abbricht, gibt diese Methode falsezurück. Andernfalls wird truezurückgegeben.If any of the controls cancel the Validating event, this method will return false; otherwise, it will return true.

Wenn ein-Steuerelement an eine Datenquelle gebunden ist und das Validating-Ereignis auftritt, bewirkt dies, dass das-Steuerelement seine aktuellen Daten zurück an die Datenquelle überträgt.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.

Das Aufrufen von ValidateChildren entspricht dem Aufrufen von ValidateChildren mit einer ValidationConstraints None.Calling ValidateChildren is equivalent to calling ValidateChildren with a ValidationConstraints of None.

ValidateChildren(ValidationConstraints)

Bewirkt, dass alle untergeordneten Steuerelemente in einem Steuerelement, die die Validierung unterstützen, ihre Daten validieren.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

Parameter

validationConstraints
ValidationConstraints

Schränkt ein, bei welchen Steuerelementen das Validating-Ereignis ausgelöst wird.Places restrictions on which controls have their Validating event raised.

Gibt zurück

true, wenn alle untergeordneten Elemente erfolgreich validiert wurden, andernfalls false.true if all of the children validated successfully; otherwise, false. Wenn sie vom Validating-Ereignishandler oder vom Validated-Ereignishandler aufgerufen wird, gibt diese Methode immer false zurück.If called from the Validating or Validated event handlers, this method will always return false.

Attribute

Beispiele

Im folgenden Codebeispiel wird nur das Validating Ereignis für unmittelbare untergeordnete Elemente des Formulars ausgelöst, dessen Enabled-Eigenschaft trueist.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

Hinweise

ValidateChildren untersucht alle untergeordneten Elemente des aktuellen Steuer Elements und bewirkt, dass das Validating-Ereignis in einem Steuerelement auftritt, wenn es die von ValidationConstraintsgeschriebenen Kriterien erfüllt.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.

Sie können mehrere ValidationConstraints Parameter gleichzeitig verwenden, indem Sie Sie mit einem bitweisen OR-Operator kombinieren.You may use several ValidationConstraints parameters at once by combining them with a bitwise OR operator. Die Kombination von Parametern mit einem bitweisen OR-Operator führt zu einer logischen and-Operation.Combining parameters with a bitwise OR operator will result in a logical AND operation. Wenn Sie ValidateChildren(ValidationConstraints.ImmediateChildren | ValidationConstraints.Enabled) aufrufen, wird z. b. nur das Validating-Ereignis für Steuerelemente erhoben, die sowohl unmittelbar untergeordnete Elemente des Containers sind und aktiviert sind.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.

Unabhängig von den Parametern, die Sie für diese Methode angeben, muss für ein Steuerelement die CausesValidation-Eigenschaft auf true festgelegt sein, damit das Validating Ereignis auftritt.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. Sie sollten auch die AutoValidate-Eigenschaft des Steuer Elements oder des Containers des Steuer Elements auf false festlegen, wenn die Validierung nur beim aufzurufen von ValidateChildrenerfolgen soll, und nicht, wenn der Benutzer den Fokus vom Steuerelement verschiebt.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.

Wenn ein-Steuerelement an eine Datenquelle gebunden ist und das Validating-Ereignis auftritt, bewirkt dies, dass das-Steuerelement seine aktuellen Daten zurück an die Datenquelle überträgt.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.

Sie können den umgekehrten Effekt eines ValidationConstraints-Parameters nicht durch Anwenden eines bitweisen Negations Operators erzielen.You cannot achieve the opposite effect of a ValidationConstraints parameter by applying a bitwise negation operator. Wenn Sie z. b. den negativen Wert des Visible Felds ValidateChildrenangeben, werden nicht alle untergeordneten Elemente überprüft, die im Container nicht sichtbar sind.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. Das Bereitstellen eines negativen Parameters für ValidateChildren hat keine Auswirkung auf den Container oder seine untergeordneten Elemente.Supplying any negative parameter to ValidateChildren will have no effect on the container or its children.

Gilt für: