是否有办法在VB。NET使组件，如按钮和菜单栏显示在设计视图，你添加它们在编程?
现在在Java中，如果您在代码中添加一个按钮，它将显示在设计视图中，如果您来回切换。这可以在VB.NET中完成吗?
代码:Imports System.IO
Public Class Form1
Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
'defining the main menu bar
Dim mnuBar As New MainMenu()
'defining the menu items for the main menu bar
Dim myMenuItemFile As New MenuItem("&File")
Dim myMenuItemEdit As New MenuItem("&Edit")
Dim myMenuItemView As New MenuItem("&View")
Dim myMenuItemProject As New MenuItem("&Project")
'adding the menu items to the main menu bar
mnuBar.MenuItems.Add(myMenuItemFile)
mnuBar.MenuItems.Add(myMenuItemEdit)
mnuBar.MenuItems.Add(myMenuItemView)
mnuBar.MenuItems.Add(myMenuItemProject)
' defining some sub menus
Dim myMenuItemNew As New MenuItem("&New")
Dim myMenuItemOpen As New MenuItem("&Open")
Dim myMenuItemSave As New MenuItem("&Save")
'add sub menus to the File menu
myMenuItemFile.MenuItems.Add(myMenuItemNew)
myMenuItemFile.MenuItems.Add(myMenuItemOpen)
myMenuItemFile.MenuItems.Add(myMenuItemSave)
'add the main menu to the form
Me.Menu = mnuBar
' Set the caption bar text of the form.
Me.Text = "tutorialspoint.com"
'create a new TreeView
Dim TreeView1 As TreeView
TreeView1 = New TreeView()
TreeView1.Location = New Point(5, 30)
TreeView1.Size = New Size(150, 150)
Me.Controls.Add(TreeView1)
TreeView1.Nodes.Clear()
'Creating the root node
Dim root = New TreeNode("Application")
TreeView1.Nodes.Add(root)
TreeView1.Nodes(0).Nodes.Add(New TreeNode("Project 1"))
'Creating child nodes under the first child
For loopindex As Integer = 1 To 4
TreeView1.Nodes(0).Nodes(0).Nodes.Add(New _
TreeNode("Sub Project" & Str(loopindex)))
Next loopindex
' creating child nodes under the root
TreeView1.Nodes(0).Nodes.Add(New TreeNode("Project 6"))
'creating child nodes under the created child node
For loopindex As Integer = 1 To 3
TreeView1.Nodes(0).Nodes(1).Nodes.Add(New _
TreeNode("Project File" & Str(loopindex)))
Next loopindex
' Set the caption bar text of the form.
Me.Text = "tutorialspoint.com"
End Sub
Private Sub openInWeb()
Try
Dim url As String = "http://www.stackoverflow.com"
Process.Start(url)
Catch ex As Exception
MsgBox("There's something wrong!")
Finally
End Try
End Sub
Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
Dim fileReader As System.IO.StreamReader
fileReader =
My.Computer.FileSystem.OpenTextFileReader("C:Usersitpr13266DesktopAsnreiu3.txt")
Dim stringReader As String
stringReader = fileReader.ReadLine()
MsgBox("The first line of the file is " & stringReader)
openInWeb()
End Sub
Private Sub Button2_Click(sender As System.Object, e As System.EventArgs) Handles Button2.Click
Dim myStream As Stream = Nothing
Dim openFileBox As New OpenFileDialog()
openFileBox.InitialDirectory = "c:"
openFileBox.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*"
openFileBox.FilterIndex = 2
openFileBox.RestoreDirectory = True
If openFileBox.ShowDialog() = System.Windows.Forms.DialogResult.OK Then
Try
myStream = openFileBox.OpenFile()
If (myStream IsNot Nothing) Then
' Insert code to read the stream here.
'**************************
' your code will go here *
'**************************
End If
Catch Ex As Exception
MessageBox.Show("Cannot read file from disk. Original error: " & Ex.Message)
Finally
If (myStream IsNot Nothing) Then
myStream.Close()
End If
End Try
End If
End Sub
Private Sub Button3_Click(sender As System.Object, e As System.EventArgs) Handles Button3.Click
Dim myStream As Stream
Dim saveFileDialog1 As New SaveFileDialog()
saveFileDialog1.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*"
saveFileDialog1.FilterIndex = 2
saveFileDialog1.RestoreDirectory = True
If saveFileDialog1.ShowDialog() = DialogResult.OK Then
myStream = saveFileDialog1.OpenFile()
If (myStream IsNot Nothing) Then
' Code to write the stream goes here.
myStream.Close()
End If
End If
End Sub
Private Sub ToolTip1_Popup(sender As System.Object, e As System.Windows.Forms.PopupEventArgs) Handles ToolTip1.Popup
End Sub
Private Sub Button(p1 As Object)
Throw New NotImplementedException
End Sub
Private Function myButton() As Windows.Forms.Button
Throw New NotImplementedException
End Function
Private Sub Button4_Click(sender As System.Object, e As System.EventArgs) Handles Button4.Click
AboutBox1.Show()
End Sub
Private Sub Button5_Click(sender As System.Object, e As System.EventArgs) Handles Button5.Click
Dim lbl As New Label
lbl.Size = New System.Drawing.Size(159, 23) 'set your size (if required)
lbl.Location = New System.Drawing.Point(12, 190) 'set your location
lbl.Text = "You just clicked button 5" 'set the text for your label
Me.Controls.Add(lbl) 'add your new control to your forms control collection
End Sub
Public Sub HellowWorld()
MsgBox("Hello World!")
End Sub
Private Sub Button6_Click(sender As System.Object, e As System.EventArgs) Handles Button6.Click
HellowWorld()
End Sub
Private Sub Button7_Click(sender As System.Object, e As System.EventArgs) Handles Button7.Click
Dim ProgressBar1 As ProgressBar
Dim ProgressBar2 As ProgressBar
ProgressBar1 = New ProgressBar()
ProgressBar2 = New ProgressBar()
'set position
ProgressBar1.Location = New Point(10, 200)
ProgressBar2.Location = New Point(10, 250)
'set values
ProgressBar1.Minimum = 0
ProgressBar1.Maximum = 200
ProgressBar1.Value = 130
ProgressBar2.Minimum = 0
ProgressBar2.Maximum = 100
ProgressBar2.Value = 40
'add the progress bar to the form
Me.Controls.Add(ProgressBar1)
Me.Controls.Add(ProgressBar2)
' Set the caption bar text of the form.
End Sub
End Class
设计器只显示在FormName.Designer.vb文件中创建的控件。它不运行FormName.vb文件中的代码。当在设计器中添加控件时，它们被添加到FormName.Designer.vb文件中的InitializeComponent()方法中。
所以在设计器中显示控件的唯一方法是在设计器中添加它们或手动编辑FormName.Designer.vb文件。如果选择后者，则应该非常接近地模拟由设计器生成的代码，以避免在显示设计器时出现问题。此外，要做好准备，设计器将FormName.Designer.vb文件视为完全生成的代码，并可能决定早晚重新创建该文件，省略它无法处理的部分。
边注:为了看到FormName.Designer.vb文件，你应该在解决方案资源管理器中为项目选择"显示所有文件"。