ContainerControl.ValidateChildren ContainerControl.ValidateChildren ContainerControl.ValidateChildren ContainerControl.ValidateChildren Method

Definición

Hace que todos los controles secundarios de un control que admiten validación validen sus datos.Causes all of the child controls within a control that support validation to validate their data.

Sobrecargas

ValidateChildren() ValidateChildren() ValidateChildren() ValidateChildren()

Hace que todos los controles secundarios de un control que admiten validación validen sus datos.Causes all of the child controls within a control that support validation to validate their data.

ValidateChildren(ValidationConstraints) ValidateChildren(ValidationConstraints) ValidateChildren(ValidationConstraints)

Hace que todos los controles secundarios de un control que admiten validación validen sus datos.Causes all of the child controls within a control that support validation to validate their data.

ValidateChildren() ValidateChildren() ValidateChildren() ValidateChildren()

Hace que todos los controles secundarios de un control que admiten validación validen sus datos.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

Devoluciones

true si todos los elementos secundarios se validan correctamente; de lo contrario, false.true if all of the children validated successfully; otherwise, false. Si se llama desde los controladores de eventos Validating o Validated, este método siempre devolverá false.If called from the Validating or Validated event handlers, this method will always return false.

Ejemplos

En el ejemplo de código siguiente se desactiva la validación implícita de un formulario y todos sus controles independientes y en su lugar, realiza manualmente la validación de todos los elementos secundarios del formulario cuando se hace clic en un botón del mouse.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
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 'Main

    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

Comentarios

ValidateChildren se desciende en una jerarquía de control y examine cada control para ver si admite la validación.ValidateChildren will descend a control's hierarchy and examine each control to see if it supports validation. Si el usuario puede seleccionar el control y su CausesValidation propiedad es true, ValidateChildren hará que el Validating eventos que se produzca.If the control can be selected by the user and its CausesValidation property is true, ValidateChildren will cause the Validating event to occur. Si cualquiera de los controles cancelar el Validating evento, este método devolverá false; en caso contrario, devolverá true.If any of the controls cancel the Validating event, this method will return false; otherwise, it will return true.

Si un control se enlaza a un origen de datos y el Validating evento tiene lugar, hará que el control va a devolver los datos actuales al origen de datos.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.

Una llamada a ValidateChildren equivale a llamar a ValidateChildren con un ValidationConstraints de None.Calling ValidateChildren is equivalent to calling ValidateChildren with a ValidationConstraints of None.

ValidateChildren(ValidationConstraints) ValidateChildren(ValidationConstraints) ValidateChildren(ValidationConstraints)

Hace que todos los controles secundarios de un control que admiten validación validen sus datos.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

Parámetros

validationConstraints
ValidationConstraints ValidationConstraints ValidationConstraints ValidationConstraints

Especifica restricciones referentes a los controles para los que se genera el evento Validating.Places restrictions on which controls have their Validating event raised.

Devoluciones

true si todos los elementos secundarios se validan correctamente; de lo contrario, false.true if all of the children validated successfully; otherwise, false. Si se llama desde los controladores de eventos Validating o Validated, este método siempre devolverá false.If called from the Validating or Validated event handlers, this method will always return false.

Ejemplos

El ejemplo de código siguiente hará que solo el Validating que se produce en los elementos secundarios inmediatos del formulario cuya propiedad Enabled propiedad es true.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 'Form1_Load


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


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


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


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


        Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles button1.Click
            Me.ValidateChildren((ValidationConstraints.ImmediateChildren Or ValidationConstraints.Enabled))
        End Sub 'Button1_Click
    End Class 'Form1
End Namespace 'ValidateChildrenWithConstraints

Comentarios

ValidateChildren examinará todos los elementos secundarios del control actual, provocando la Validating eventos que se produzca en un control si cumple los criterios especificados por ValidationConstraints.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.

Se pueden usar varios ValidationConstraints parámetros a la vez mediante la combinación de ellos con un operador OR bit a bit.You may use several ValidationConstraints parameters at once by combining them with a bitwise OR operator. Combinación de parámetros con un operador OR bit a bit dará como resultado una operación AND lógica.Combining parameters with a bitwise OR operator will result in a logical AND operation. Por ejemplo, al llamar a ValidateChildren(ValidationConstraints.ImmediateChildren | ValidationConstraints.Enabled) solo generará el Validating eventos de los controles que son elementos secundarios inmediatos del contenedor y están habilitadas.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.

Independientemente de los parámetros especificados para este método, debe tener un control de su CausesValidation propiedad establecida en true en orden para su Validating eventos que se produzca.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. También debe establecer el AutoValidate propiedad del control o del contenedor del control a false si desea que ocurra sólo cuando se llama a la validación ValidateChildren, y no cuando el usuario desplace el foco del control.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.

Si un control se enlaza a un origen de datos y el Validating evento tiene lugar, hará que el control va a devolver los datos actuales al origen de datos.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.

No se puede lograr el efecto contrario de una ValidationConstraints parámetro aplicando un operador de negación bit a bit.You cannot achieve the opposite effect of a ValidationConstraints parameter by applying a bitwise negation operator. Por ejemplo, si proporciona el valor negativo de la Visible campo ValidateChildren, no validará los elementos secundarios que no son visibles en el contenedor.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. Proporcionar cualquier parámetro negativo a ValidateChildren no tendrán ningún efecto en el contenedor o sus elementos secundarios.Supplying any negative parameter to ValidateChildren will have no effect on the container or its children.

Se aplica a