vb.net中窗体中的缩小,放大,关闭可以去掉吗?

可以，属性controlBox 为false可以去掉三个按钮，另外还有maximize,minimize 可以分别控制最大化和最小化按钮的显示。

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vb.net让窗口关闭时,取消关闭,隐藏窗口

问题补充：我用VB.NET写的，FORM2用来实现数据采样并显示实时曲线，关闭后再'取消FORM2的关闭 这样就把FORM2隐藏起来了，需要调出来的时候只需以下代码

VB2008 如何取消窗体的关闭按钮

设置ControlBox为False是可以的，不过全部按钮都会消失（包括最小化，最大化）

用API可以单独把关闭按钮干掉……

'VB.NET Code

Public Class Form1

Private Declare Function GetSystemMenu Lib "User32 " (ByVal hwnd As Integer, ByVal bRevert As Long) As Integer

Private Declare Function RemoveMenu Lib "User32 " (ByVal hMenu As Integer, ByVal nPosition As Integer, ByVal wFlags As Integer) As Integer

Private Declare Function DrawMenuBar Lib "User32 " (ByVal hwnd As Integer) As Integer

Private Declare Function GetMenuItemCount Lib "User32 " (ByVal hMenu As Integer) As Integer

Private Const MF_BYPOSITION = H400

Private Const MF_DISABLED = H2

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

Dim hMenu As Integer, nCount As Integer

hMenu = GetSystemMenu(Me.Handle.ToInt32, 0)

nCount = GetMenuItemCount(hMenu)

'Debug.Print(nCount)

Call RemoveMenu(hMenu, nCount - 1, MF_DISABLED Or MF_BYPOSITION)

DrawMenuBar(Me.Handle.ToInt32)

End Sub

End Class

'VB6 code =============================================================

Private Declare Function GetSystemMenu Lib "User32 " (ByVal hwnd As Long, ByVal bRevert As Long) As Integer

Private Declare Function RemoveMenu Lib "User32 " (ByVal hMenu As Long, ByVal nPosition As Long, ByVal wFlags As Long) As Long

Private Declare Function DrawMenuBar Lib "User32 " (ByVal hwnd As Long) As Long

Private Declare Function GetMenuItemCount Lib "User32 " (ByVal hMenu As Long) As Long

Private Const MF_BYPOSITION = H400

Private Const MF_DISABLED = H2

Private Sub Form1_Load()

Dim hMenu As Long, nCount As Long

hMenu = GetSystemMenu(Me.hWnd, 0)

nCount = GetMenuItemCount(hMenu)

'Debug.Print nCount

Call RemoveMenu(hMenu, nCount - 1, MF_DISABLED Or MF_BYPOSITION)

DrawMenuBar Me.hWnd

End Sub

VB.net 打开文件之后怎样关闭？

你都用.net了，这是vb的旧语法，不推荐使用。vb.net是面向对象的，推荐您使用

dim OpF as new io.filestream(OpenFileDialog1.FileName, IO.FileMode.Open)

...

OpF.close

或是

Using OpF as new io.filestream(OpenFileDialog1.FileName, IO.FileMode.Open)

...

End Using

但是你如果执意要用的话，也可以：

FileOpen(1, OpenFileDialog1.FileName, OpenMode.Input)

...

FileClose(1) '这里可以同时关闭多个文件号，文件号之间用,隔开

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