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

定义

使控件内支持验证的所有子控件都对其数据进行验证。Causes all of the child controls within a control that support validation to validate their data.

重载

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

使控件内支持验证的所有子控件都对其数据进行验证。Causes all of the child controls within a control that support validation to validate their data.

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

使控件内支持验证的所有子控件都对其数据进行验证。Causes all of the child controls within a control that support validation to validate their data.

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

使控件内支持验证的所有子控件都对其数据进行验证。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

返回

如果成功验证所有子级,则为 true;否则为 falsetrue if all of the children validated successfully; otherwise, false. 如果是从 ValidatingValidated 事件处理程序调用的,则该方法将始终返回 falseIf called from the Validating or Validated event handlers, this method will always return false.

示例

下面的代码示例将关闭窗体及其包含的所有控件的隐式验证,并在单击鼠标按钮时手动执行窗体的所有子级的验证。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

注解

ValidateChildren将从控件的层次结构中进行检查,并检查每个控件是否支持验证。ValidateChildren will descend a control's hierarchy and examine each control to see if it supports validation. 如果用户可以选择CausesValidation控件,并且它的属性为trueValidateChildren则将导致Validating事件发生。If the control can be selected by the user and its CausesValidation property is true, ValidateChildren will cause the Validating event to occur. 如果任何控件取消Validating事件,则此方法将返回false; 否则将返回trueIf any of the controls cancel the Validating event, this method will return false; otherwise, it will return true.

如果将控件绑定到数据源,并Validating发生事件,则它将导致控件将其当前数据推送回数据源。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.

调用ValidateChildren等效于对ValidateChildren ValidationConstraintsNone调用。Calling ValidateChildren is equivalent to calling ValidateChildren with a ValidationConstraints of None.

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

使控件内支持验证的所有子控件都对其数据进行验证。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

参数

validationConstraints
ValidationConstraints ValidationConstraints ValidationConstraints ValidationConstraints

添加对哪些控件可以引发其 Validating 事件的限制。Places restrictions on which controls have their Validating event raised.

返回

如果成功验证所有子级,则为 true;否则为 falsetrue if all of the children validated successfully; otherwise, false. 如果是从 ValidatingValidated 事件处理程序调用的,则该方法将始终返回 falseIf called from the Validating or Validated event handlers, this method will always return false.

示例

下面的代码示例将仅为其Validating Enabled属性为true的窗体的直接子级导致事件发生。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

注解

ValidateChildren将检查当前控件的所有子级,从而导致Validating在控件上发生事件,前提是该事件满足的条件。 ValidationConstraintsValidateChildren 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.

你可以一次ValidationConstraints使用多个参数,方法是将它们与按位 or 运算符组合在一起。You may use several ValidationConstraints parameters at once by combining them with a bitwise OR operator. 使用按位 "或" 运算符组合参数将导致逻辑 AND 运算。Combining parameters with a bitwise OR operator will result in a logical AND operation. 例如,调用ValidateChildren(ValidationConstraints.ImmediateChildren | ValidationConstraints.Enabled)将仅对同时为Validating容器的直接子级的控件引发事件,并启用。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.

无论你为此方法指定的参数如何,控件都必须将其CausesValidation属性设置为true ,以使其Validating事件发生。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. 如果希望仅在调用AutoValidate ValidateChildren时进行验证,则还应将控件或控件false的容器的属性设置为,而不是在用户从控件中移动焦点时进行。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.

如果将控件绑定到数据源,并Validating发生事件,则它将导致控件将其当前数据推送回数据源。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.

不能通过应用按位求反ValidationConstraints运算符来实现相反的参数效果。You cannot achieve the opposite effect of a ValidationConstraints parameter by applying a bitwise negation operator. 例如,如果将Visible字段的负值提供给ValidateChildren,则不会验证容器上不可见的所有子级。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提供任何负参数将对容器或其子级不起任何作用。Supplying any negative parameter to ValidateChildren will have no effect on the container or its children.

适用于