VB.Net/GUI/TextBox Validation
Содержание
TextBox Validating Event
<source lang="vbnet"> Imports System Imports System.Collections Imports System.Data Imports System.IO Imports System.Xml.Serialization Imports System.Windows.Forms Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Drawing.Text Imports System.Drawing.Printing
Public Class MainClass
Shared Sub Main()
Dim form1 As Form = New Form1()
Application.Run(form1)
End Sub
End Class
Public Class Form1
Inherits System.Windows.Forms.Form
- Region " Windows Form Designer generated code "
Public Sub New()
MyBase.New()
"This call is required by the Windows Form Designer.
InitializeComponent()
"Add any initialization after the InitializeComponent() call
End Sub
"Form overrides dispose to clean up the component list.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub
Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
Friend WithEvents Label1 As System.Windows.Forms.Label
"Required by the Windows Form Designer
Private components As System.ruponentModel.Container
"NOTE: The following procedure is required by the Windows Form Designer
"It can be modified using the Windows Form Designer.
"Do not modify it using the code editor.
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.TextBox1 = New System.Windows.Forms.TextBox()
Me.Label1 = New System.Windows.Forms.Label()
Me.SuspendLayout()
"
"TextBox1
"
Me.TextBox1.Font = New System.Drawing.Font("Microsoft Sans Serif", 10.2!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
Me.TextBox1.Location = New System.Drawing.Point(48, 104)
Me.TextBox1.Name = "TextBox1"
Me.TextBox1.Size = New System.Drawing.Size(192, 27)
Me.TextBox1.TabIndex = 1
Me.TextBox1.Text = ""
"
"Label1
"
Me.Label1.Font = New System.Drawing.Font("Microsoft Sans Serif", 10.2!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
Me.Label1.Location = New System.Drawing.Point(24, 24)
Me.Label1.Name = "Label1"
Me.Label1.Size = New System.Drawing.Size(232, 48)
Me.Label1.TabIndex = 2
Me.Label1.Text = "Type somthing"
"
"Form1
"
Me.AutoScaleBaseSize = New System.Drawing.Size(6, 15)
Me.ClientSize = New System.Drawing.Size(292, 268)
Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.Label1, Me.TextBox1})
Me.Name = "Form1"
Me.Text = "Key Event Examples"
Me.ResumeLayout(False)
End Sub
- End Region
Private Sub TextBox1_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.TextChanged
End Sub
Public Sub TextBox1_Validating(ByVal sender As Object, _
ByVal e As System.ruponentModel.CancelEventArgs) _
Handles TextBox1.Validating
" cancel the focus shift if the textbox is empty
MessageBox.Show("Validating")
If TextBox1.Text.Trim = Nothing Then e.Cancel = True
End Sub
End Class
</source>
TextBox validation: validate in Button click event
<source lang="vbnet"> Imports System Imports System.Drawing Imports System.Windows.Forms
Public Class MainClass
Shared Sub Main()
Dim form1 As Form = New Form1
Application.Run(form1)
End Sub
End Class Public Class Form1
Inherits System.Windows.Forms.Form
- Region " Windows Form Designer generated code "
Public Sub New()
MyBase.New()
"This call is required by the Windows Form Designer.
InitializeComponent()
"Add any initialization after the InitializeComponent() call
End Sub
"Form overrides dispose to clean up the component list.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub
"Required by the Windows Form Designer
Private components As System.ruponentModel.IContainer
"NOTE: The following procedure is required by the Windows Form Designer
"It can be modified using the Windows Form Designer.
"Do not modify it using the code editor.
Friend WithEvents GroupBox1 As System.Windows.Forms.GroupBox
Friend WithEvents Label2 As System.Windows.Forms.Label
Friend WithEvents Label1 As System.Windows.Forms.Label
Friend WithEvents txtFirstName As System.Windows.Forms.TextBox
Friend WithEvents txtLastName As System.Windows.Forms.TextBox
Friend WithEvents Button1 As System.Windows.Forms.Button
Friend WithEvents errProvider As System.Windows.Forms.ErrorProvider
Friend WithEvents txtEmail As System.Windows.Forms.TextBox
Friend WithEvents Label3 As System.Windows.Forms.Label
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.GroupBox1 = New System.Windows.Forms.GroupBox()
Me.Label2 = New System.Windows.Forms.Label()
Me.Label1 = New System.Windows.Forms.Label()
Me.txtFirstName = New System.Windows.Forms.TextBox()
Me.txtLastName = New System.Windows.Forms.TextBox()
Me.Button1 = New System.Windows.Forms.Button()
Me.errProvider = New System.Windows.Forms.ErrorProvider()
Me.txtEmail = New System.Windows.Forms.TextBox()
Me.Label3 = New System.Windows.Forms.Label()
Me.GroupBox1.SuspendLayout()
Me.SuspendLayout()
"
"GroupBox1
"
Me.GroupBox1.Controls.AddRange(New System.Windows.Forms.Control() {Me.Label3, Me.txtEmail, Me.Label2, Me.Label1, Me.txtFirstName, Me.txtLastName})
Me.GroupBox1.Location = New System.Drawing.Point(8, 8)
Me.GroupBox1.Name = "GroupBox1"
Me.GroupBox1.Size = New System.Drawing.Size(368, 124)
Me.GroupBox1.TabIndex = 11
Me.GroupBox1.TabStop = False
"
"Label2
"
Me.Label2.Location = New System.Drawing.Point(16, 52)
Me.Label2.Name = "Label2"
Me.Label2.Size = New System.Drawing.Size(64, 16)
Me.Label2.TabIndex = 8
Me.Label2.Text = "Last Name:"
"
"Label1
"
Me.Label1.Location = New System.Drawing.Point(16, 28)
Me.Label1.Name = "Label1"
Me.Label1.Size = New System.Drawing.Size(64, 16)
Me.Label1.TabIndex = 7
Me.Label1.Text = "First Name:"
"
"txtFirstName
"
Me.txtFirstName.Location = New System.Drawing.Point(84, 24)
Me.txtFirstName.Name = "txtFirstName"
Me.txtFirstName.Size = New System.Drawing.Size(152, 21)
Me.txtFirstName.TabIndex = 4
Me.txtFirstName.Text = ""
"
"txtLastName
"
Me.txtLastName.Location = New System.Drawing.Point(84, 48)
Me.txtLastName.Name = "txtLastName"
Me.txtLastName.Size = New System.Drawing.Size(152, 21)
Me.txtLastName.TabIndex = 5
Me.txtLastName.Text = ""
"
"Button1
"
Me.Button1.Location = New System.Drawing.Point(152, 204)
Me.Button1.Name = "Button1"
Me.Button1.Size = New System.Drawing.Size(76, 24)
Me.Button1.TabIndex = 10
Me.Button1.Text = "OK"
"
"txtEmail
"
Me.txtEmail.Location = New System.Drawing.Point(84, 84)
Me.txtEmail.Name = "txtEmail"
Me.txtEmail.Size = New System.Drawing.Size(152, 21)
Me.txtEmail.TabIndex = 9
Me.txtEmail.Text = ""
"
"Label3
"
Me.Label3.Location = New System.Drawing.Point(16, 88)
Me.Label3.Name = "Label3"
Me.Label3.Size = New System.Drawing.Size(64, 16)
Me.Label3.TabIndex = 10
Me.Label3.Text = "Email:"
"
"ErrorProviderValidation
"
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 14)
Me.ClientSize = New System.Drawing.Size(388, 238)
Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.GroupBox1, Me.Button1})
Me.Font = New System.Drawing.Font("Tahoma", 8.25!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
Me.Name = "ErrorProviderValidation"
Me.Text = "ErrorProvider Validation"
Me.GroupBox1.ResumeLayout(False)
Me.ResumeLayout(False)
End Sub
- End Region
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim InvalidInput As Boolean = False
Dim ctrl As Control
For Each ctrl In Me.GroupBox1.Controls
If errProvider.GetError(ctrl) <> "" Then
InvalidInput = True
Exit For
End If
Next
If InvalidInput = True Then
MessageBox.Show("You still have invalid input.", "Invalid Input", MessageBoxButtons.OK, MessageBoxIcon.Warning)
Else
Me.Close()
End If
End Sub
End Class
</source>
TextBox validation: validate in Validating Event
<source lang="vbnet"> Imports System Imports System.Drawing Imports System.Windows.Forms
Public Class MainClass
Shared Sub Main()
Dim form1 As Form = New Form1
Application.Run(form1)
End Sub
End Class Public Class Form1
Inherits System.Windows.Forms.Form
- Region " Windows Form Designer generated code "
Public Sub New()
MyBase.New()
"This call is required by the Windows Form Designer.
InitializeComponent()
"Add any initialization after the InitializeComponent() call
End Sub
"Form overrides dispose to clean up the component list.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub
"Required by the Windows Form Designer
Private components As System.ruponentModel.IContainer
"NOTE: The following procedure is required by the Windows Form Designer
"It can be modified using the Windows Form Designer.
"Do not modify it using the code editor.
Friend WithEvents GroupBox1 As System.Windows.Forms.GroupBox
Friend WithEvents Label2 As System.Windows.Forms.Label
Friend WithEvents Label1 As System.Windows.Forms.Label
Friend WithEvents txtFirstName As System.Windows.Forms.TextBox
Friend WithEvents txtLastName As System.Windows.Forms.TextBox
Friend WithEvents Button1 As System.Windows.Forms.Button
Friend WithEvents errProvider As System.Windows.Forms.ErrorProvider
Friend WithEvents txtEmail As System.Windows.Forms.TextBox
Friend WithEvents Label3 As System.Windows.Forms.Label
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
Me.GroupBox1 = New System.Windows.Forms.GroupBox()
Me.Label2 = New System.Windows.Forms.Label()
Me.Label1 = New System.Windows.Forms.Label()
Me.txtFirstName = New System.Windows.Forms.TextBox()
Me.txtLastName = New System.Windows.Forms.TextBox()
Me.Button1 = New System.Windows.Forms.Button()
Me.errProvider = New System.Windows.Forms.ErrorProvider()
Me.txtEmail = New System.Windows.Forms.TextBox()
Me.Label3 = New System.Windows.Forms.Label()
Me.GroupBox1.SuspendLayout()
Me.SuspendLayout()
"
"GroupBox1
"
Me.GroupBox1.Controls.AddRange(New System.Windows.Forms.Control() {Me.Label3, Me.txtEmail, Me.Label2, Me.Label1, Me.txtFirstName, Me.txtLastName})
Me.GroupBox1.Location = New System.Drawing.Point(8, 8)
Me.GroupBox1.Name = "GroupBox1"
Me.GroupBox1.Size = New System.Drawing.Size(368, 124)
Me.GroupBox1.TabIndex = 11
Me.GroupBox1.TabStop = False
"
"Label2
"
Me.Label2.Location = New System.Drawing.Point(16, 52)
Me.Label2.Name = "Label2"
Me.Label2.Size = New System.Drawing.Size(64, 16)
Me.Label2.TabIndex = 8
Me.Label2.Text = "Last Name:"
"
"Label1
"
Me.Label1.Location = New System.Drawing.Point(16, 28)
Me.Label1.Name = "Label1"
Me.Label1.Size = New System.Drawing.Size(64, 16)
Me.Label1.TabIndex = 7
Me.Label1.Text = "First Name:"
"
"txtFirstName
"
Me.txtFirstName.Location = New System.Drawing.Point(84, 24)
Me.txtFirstName.Name = "txtFirstName"
Me.txtFirstName.Size = New System.Drawing.Size(152, 21)
Me.txtFirstName.TabIndex = 4
Me.txtFirstName.Text = ""
"
"txtLastName
"
Me.txtLastName.Location = New System.Drawing.Point(84, 48)
Me.txtLastName.Name = "txtLastName"
Me.txtLastName.Size = New System.Drawing.Size(152, 21)
Me.txtLastName.TabIndex = 5
Me.txtLastName.Text = ""
"
"Button1
"
Me.Button1.Location = New System.Drawing.Point(152, 204)
Me.Button1.Name = "Button1"
Me.Button1.Size = New System.Drawing.Size(76, 24)
Me.Button1.TabIndex = 10
Me.Button1.Text = "OK"
"
"txtEmail
"
Me.txtEmail.Location = New System.Drawing.Point(84, 84)
Me.txtEmail.Name = "txtEmail"
Me.txtEmail.Size = New System.Drawing.Size(152, 21)
Me.txtEmail.TabIndex = 9
Me.txtEmail.Text = ""
"
"Label3
"
Me.Label3.Location = New System.Drawing.Point(16, 88)
Me.Label3.Name = "Label3"
Me.Label3.Size = New System.Drawing.Size(64, 16)
Me.Label3.TabIndex = 10
Me.Label3.Text = "Email:"
"
"ErrorProviderValidation
"
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 14)
Me.ClientSize = New System.Drawing.Size(388, 238)
Me.Controls.AddRange(New System.Windows.Forms.Control() {Me.GroupBox1, Me.Button1})
Me.Font = New System.Drawing.Font("Tahoma", 8.25!, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, CType(0, Byte))
Me.Name = "ErrorProviderValidation"
Me.Text = "ErrorProvider Validation"
Me.GroupBox1.ResumeLayout(False)
Me.ResumeLayout(False)
End Sub
- End Region
Private Sub txtName_Validating(ByVal sender As Object, ByVal e As System.ruponentModel.CancelEventArgs) Handles txtFirstName.Validating, txtLastName.Validating
If CType(sender, TextBox).Text = "" Then
errProvider.SetError(sender, "You must enter a first and last name.")
Else
errProvider.SetError(sender, "")
End If
End Sub
End Class
</source>
Text Field Validation: five digits
<source lang="vbnet"> Imports System Imports System.ruponentModel Imports System.Windows.Forms Imports System.Data Imports System.Configuration Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Drawing.Text Imports System.Globalization Imports System.Text Imports System.Collections Public Class MainClass
Shared Sub Main()
Dim myform As Form = New Form1()
Application.Run(myform)
End Sub
End Class Public Class Form1
Private Sub TextBox1_Validating(ByVal sender As Object, ByVal e As System.ruponentModel.CancelEventArgs) Handles TextBox1.Validating, TextBox2.Validating, TextBox3.Validating
ValidateFiveDigits(DirectCast(sender, TextBox))
End Sub
Private Sub ValidateFiveDigits(ByVal text_box As TextBox)
If (text_box.Text.Length <> 0) And _
Not (text_box.Text Like "#####") _
Then
" Invalid. Set an error.
ErrorProvider1.SetError(text_box, _
text_box.Name & " must contain exactly five digits")
Else
" Valid. Clear the error.
ErrorProvider1.SetError(text_box, "")
End If
End Sub
Private Sub Form1_FormClosing(ByVal sender As Object, ByVal e As System.Windows.Forms.FormClosingEventArgs) Handles Me.FormClosing
e.Cancel = True
If IsInvalidField(TextBox1) Then
Exit Sub
End If
If IsInvalidField(TextBox3) Then
Exit Sub
End If
e.Cancel = False
End Sub
Private Function IsInvalidField(ByVal ctl As Control) As Boolean
If ErrorProvider1.GetError(ctl).Length = 0 Then
Return False
Else
MessageBox.Show(ErrorProvider1.GetError(ctl))
ctl.Focus()
Return True
End If
End Function
End Class <Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _ Partial Public Class Form1
Inherits System.Windows.Forms.Form
"Form overrides dispose to clean up the component list.
<System.Diagnostics.DebuggerNonUserCode()> _
Protected Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing AndAlso components IsNot Nothing Then
components.Dispose()
End If
MyBase.Dispose(disposing)
End Sub
"Required by the Windows Form Designer
Private components As System.ruponentModel.IContainer
"NOTE: The following procedure is required by the Windows Form Designer
"It can be modified using the Windows Form Designer.
"Do not modify it using the code editor.
<System.Diagnostics.DebuggerStepThrough()> _
Private Sub InitializeComponent()
Me.ruponents = New System.ruponentModel.Container
Me.Label1 = New System.Windows.Forms.Label
Me.TextBox1 = New System.Windows.Forms.TextBox
Me.TextBox2 = New System.Windows.Forms.TextBox
Me.Label2 = New System.Windows.Forms.Label
Me.TextBox3 = New System.Windows.Forms.TextBox
Me.Label3 = New System.Windows.Forms.Label
Me.ErrorProvider1 = New System.Windows.Forms.ErrorProvider(Me.ruponents)
CType(Me.ErrorProvider1, System.ruponentModel.ISupportInitialize).BeginInit()
Me.SuspendLayout()
"
"Label1
"
Me.Label1.AutoSize = True
Me.Label1.Location = New System.Drawing.Point(8, 8)
Me.Label1.Name = "Label1"
Me.Label1.Size = New System.Drawing.Size(56, 13)
Me.Label1.TabIndex = 0
Me.Label1.Text = "Five Digits"
"
"TextBox1
"
Me.TextBox1.Location = New System.Drawing.Point(72, 8)
Me.TextBox1.Name = "TextBox1"
Me.TextBox1.Size = New System.Drawing.Size(80, 20)
Me.TextBox1.TabIndex = 1
"
"TextBox2
"
Me.TextBox2.Location = New System.Drawing.Point(72, 32)
Me.TextBox2.Name = "TextBox2"
Me.TextBox2.Size = New System.Drawing.Size(80, 20)
Me.TextBox2.TabIndex = 3
"
"Label2
"
Me.Label2.AutoSize = True
Me.Label2.Location = New System.Drawing.Point(8, 32)
Me.Label2.Name = "Label2"
Me.Label2.Size = New System.Drawing.Size(56, 13)
Me.Label2.TabIndex = 2
Me.Label2.Text = "Five Digits"
"
"TextBox3
"
Me.TextBox3.Location = New System.Drawing.Point(72, 56)
Me.TextBox3.Name = "TextBox3"
Me.TextBox3.Size = New System.Drawing.Size(80, 20)
Me.TextBox3.TabIndex = 5
"
"Label3
"
Me.Label3.AutoSize = True
Me.Label3.Location = New System.Drawing.Point(8, 56)
Me.Label3.Name = "Label3"
Me.Label3.Size = New System.Drawing.Size(56, 13)
Me.Label3.TabIndex = 4
Me.Label3.Text = "Five Digits"
"
"ErrorProvider1
"
Me.ErrorProvider1.ContainerControl = Me
"
"Form1
"
Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
Me.ClientSize = New System.Drawing.Size(210, 83)
Me.Controls.Add(Me.TextBox3)
Me.Controls.Add(Me.Label3)
Me.Controls.Add(Me.TextBox2)
Me.Controls.Add(Me.Label2)
Me.Controls.Add(Me.TextBox1)
Me.Controls.Add(Me.Label1)
Me.Name = "Form1"
Me.Text = "Deferred Validation"
CType(Me.ErrorProvider1, System.ruponentModel.ISupportInitialize).EndInit()
Me.ResumeLayout(False)
Me.PerformLayout()
End Sub
Friend WithEvents Label1 As System.Windows.Forms.Label
Friend WithEvents TextBox1 As System.Windows.Forms.TextBox
Friend WithEvents TextBox2 As System.Windows.Forms.TextBox
Friend WithEvents Label2 As System.Windows.Forms.Label
Friend WithEvents TextBox3 As System.Windows.Forms.TextBox
Friend WithEvents Label3 As System.Windows.Forms.Label
Friend WithEvents ErrorProvider1 As System.Windows.Forms.ErrorProvider
End Class
</source>
