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| name | vb-winforms |
| description | Windows Forms development patterns, UI threading, data binding |
| user-invocable | false |
| disable-model-invocation | true |
| version | 1.0.0 |
| category | toolchain |
| author | Claude MPM Team |
| license | MIT |
| tags | ["visualbasic","winforms","ui","desktop","data-binding"] |
Modern Windows Forms development with VB.NET focusing on proper UI threading, data binding, and event handling.
' Form definition
Public Class CustomerForm
Inherits Form
Private customerService As ICustomerService
Private bindingSource As New BindingSource()
Public Sub New()
InitializeComponent()
customerService = New CustomerService()
End Sub
' Async load
Private Async Sub CustomerForm_Load(sender As Object, e As EventArgs) Handles MyBase.Load
Await LoadCustomersAsync()
End Sub
Private Async Function LoadCustomersAsync() As Task
Try
Cursor = Cursors.WaitCursor
Dim customers = Await customerService.GetAllAsync()
bindingSource.DataSource = customers
dataGridView.DataSource = bindingSource
Catch ex As Exception
MessageBox.Show($"Error loading customers: {ex.Message}", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
Finally
Cursor = Cursors.Default
End
' Update UI from background thread
Private Sub BackgroundWorker_ProgressChanged(sender As Object, e As ProgressChangedEventArgs)
' Already on UI thread with BackgroundWorker
progressBar.Value = e.ProgressPercentage
lblStatus.Text = $"Processing: {e.ProgressPercentage}%"
End Sub
' Manual invoke when needed
Private Sub UpdateUIFromThread(text As String)
If lblStatus.InvokeRequired Then
lblStatus.Invoke(Sub() lblStatus.Text = text)
Else
lblStatus.Text = text
End If
End Sub
' Async pattern
Private Async Sub btnProcess_Click(sender As Object, e As EventArgs) Handles btnProcess.Click
btnProcess.Enabled = False
Try
Dim result = Await Task.Run(Function() LongRunningOperation())
lblResult.Text = result ' Safe - back on UI thread
Finally
btnProcess.Enabled = True
End Try
End Sub
Private WithEvents bgWorker As New BackgroundWorker With {
.WorkerReportsProgress = True,
.WorkerSupportsCancellation = True
}
Private Sub btnStart_Click(sender As Object, e As EventArgs) Handles btnStart.Click
If Not bgWorker.IsBusy Then
bgWorker.RunWorkerAsync()
End If
End Sub
Private Sub bgWorker_DoWork(sender As Object, e As DoWorkEventArgs) Handles bgWorker.DoWork
For i = 0 To 100
If bgWorker.CancellationPending Then
e.Cancel = True
Exit For
End If
' Simulate work
Threading.Thread.Sleep(50)
bgWorker.ReportProgress(i)
Next
End Sub
Private Sub bgWorker_ProgressChanged(sender As Object, e As ProgressChangedEventArgs) Handles bgWorker.ProgressChanged
progressBar.Value = e.ProgressPercentage
End Sub
Private Sub bgWorker_RunWorkerCompleted(sender As Object, e As RunWorkerCompletedEventArgs) Handles bgWorker.RunWorkerCompleted
If e.Cancelled Then
MessageBox.Show("Operation cancelled")
ElseIf e.Error IsNot Nothing Then
MessageBox.Show($"Error: {e.Error.Message}")
Else
MessageBox.Show("Operation completed")
End If
End Sub
Public Class CustomerForm
Private bindingSource As New BindingSource()
Private customers As List(Of Customer)
Private Async Sub Form_Load(sender As Object, e As EventArgs) Handles MyBase.Load
customers = Await customerService.GetAllAsync()
' Setup binding source
bindingSource.DataSource = customers
' Bind controls
dataGridView.DataSource = bindingSource
txtName.DataBindings.Add("Text", bindingSource, "Name")
txtEmail.DataBindings.Add("Text", bindingSource, "Email")
' Navigation
bindingNavigator.BindingSource = bindingSource
End Sub
' Filter
Private Sub txtSearch_TextChanged(sender As Object, e As EventArgs) Handles txtSearch.TextChanged
If String.IsNullOrEmpty(txtSearch.Text) Then
bindingSource.RemoveFilter()
Else
bindingSource.Filter = $"Name LIKE '%{txtSearch.Text}%'"
End If
End Sub
End Class
' Customer class with INotifyPropertyChanged
Public Class Customer
Implements INotifyPropertyChanged
Private _name As String
Public Property Name As String
Get
Return _name
End Get
Set(value As String)
If _name <> value Then
_name = value
OnPropertyChanged(NameOf(Name))
End If
End Set
End Property
Public Event PropertyChanged As PropertyChangedEventHandler _
Implements INotifyPropertyChanged.PropertyChanged
Protected Sub OnPropertyChanged(propertyName As String)
RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(propertyName))
End Sub
End Class
' Button click
Private Sub btnSave_Click(sender As Object, e As EventArgs) Handles btnSave.Click
If ValidateForm() Then
SaveCustomer()
End If
End Sub
' Multiple controls, same handler
Private Sub TextBox_TextChanged(sender As Object, e As EventArgs) _
Handles txtName.TextChanged, txtEmail.TextChanged
ValidateForm()
End Sub
' Custom event arguments
Public Class CustomerEventArgs
Inherits EventArgs
Public Property Customer As Customer
Public Sub New(customer As Customer)
Me.Customer = customer
End Sub
End Class
Public Event CustomerSaved As EventHandler(Of CustomerEventArgs)
Protected Sub OnCustomerSaved(customer As Customer)
RaiseEvent CustomerSaved(Me, New CustomerEventArgs(customer))
End Sub
Private Function ValidateForm() As Boolean
errorProvider.Clear()
Dim isValid = True
' Validate name
If String.IsNullOrWhiteSpace(txtName.Text) Then
errorProvider.SetError(txtName, "Name is required")
isValid = False
End If
' Validate email
If String.IsNullOrWhiteSpace(txtEmail.Text) OrElse Not txtEmail.Text.Contains("@") Then
errorProvider.SetError(txtEmail, "Valid email is required")
isValid = False
End If
' Enable/disable save button
btnSave.Enabled = isValid
Return isValid
End Function
' Real-time validation
Private Sub txtEmail_Validating(sender As Object, e As System.ComponentModel.CancelEventArgs) _
Handles txtEmail.Validating
If Not txtEmail.Text.Contains("@") Then
errorProvider.SetError(txtEmail, "Invalid email format")
e.Cancel = True
Else
errorProvider.SetError(txtEmail, "")
End If
End Sub
Public Class CustomerDialog
Inherits Form
Public Property Customer As Customer
Private Sub btnOK_Click(sender As Object, e As EventArgs) Handles btnOK.Click
If ValidateForm() Then
Customer = New Customer With {
.Name = txtName.Text,
.Email = txtEmail.Text
}
DialogResult = DialogResult.OK
Close()
End If
End Sub
Private Sub btnCancel_Click(sender As Object, e As EventArgs) Handles btnCancel.Click
DialogResult = DialogResult.Cancel
Close()
End Sub
End Class
' Usage
Private Sub ShowCustomerDialog()
Using dialog = New CustomerDialog()
If dialog.ShowDialog() = DialogResult.OK Then
' Use dialog.Customer
customers.Add(dialog.Customer)
RefreshGrid()
End If
End Using
End Sub
' Use async for I/O operations
Private Async Sub btnLoad_Click(sender As Object, e As EventArgs) Handles btnLoad.Click
Dim data = Await LoadDataAsync()
End Sub
' Dispose resources properly
Private Sub Form_FormClosing(sender As Object, e As FormClosingEventArgs) Handles MyBase.FormClosing
connection?.Dispose()
timer?.Dispose()
End Sub
' Use BindingSource for data binding
bindingSource.DataSource = customers
dataGridView.DataSource = bindingSource
' Validate on events
Private Sub txtName_Validating(sender As Object, e As CancelEventArgs) Handles txtName.Validating
' Use ErrorProvider for validation feedback
errorProvider.SetError(txtName, "Name is required")
' Don't block UI thread
Private Sub btnLoad_Click(sender As Object, e As EventArgs) Handles btnLoad.Click
Dim data = LoadDataAsync().Result ' Blocks UI!
End Sub
' Don't update UI from background thread directly
Task.Run(Sub()
lblStatus.Text = "Done" ' WRONG - cross-thread operation
End Sub)
' Don't forget to dispose forms
Dim form = New CustomerForm()
form.Show() ' Memory leak - use Using or handle FormClosed
' Don't use Application.DoEvents
While processing
Application.DoEvents() ' Bad practice - use async instead
End While
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