关于vb.net矩形随意拖动的信息
VB.net怎么实现运行时鼠标拖动改变控件的大小啊
控件是可以显示在里面的，你只要加个label，把label的属性设为visualble=fause就行。设置鼠标经过头像的mouseHover和mouseLeave事件，当mouseHover时label的属性visualble=true，当mouseLeave时label的属性visualble=fause即可。窗体的鼠标事件可以设置控件的cursor属性，里面可以选择许多种鼠标图形。 只要是正常的Form都可以改变窗体大小，但是无边框的窗体只能用函数改变或者设置属性，在debug后是不能改变的。拖动窗体需要在窗体的load时间里面写入当鼠标单击不放时的事件即可，不难。
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VB.NET怎么可以限制窗体不能被鼠标随便拖动位置
很简单，通过WindowsAPI，删除窗体菜单项就行了
首先在窗体类中声明API：
Declare Function GetSystemMenu Lib "user32" (ByVal hWnd As IntPtr, ByVal bRevert As Boolean) As IntPtr
Declare Function RemoveMenu Lib "user32" (ByVal lngHmenu As IntPtr, ByVal nPosition As Integer, ByVal wFlags As Integer) As Integer
其次声明API参数常量：
Const MF_BYPOSITION As Integer = H400
然后在窗体类中写入过程：
Private Sub UserForm_Initialize_stopmove() '禁止窗体移动
Dim lngHwnd As IntPtr
Dim lngHmenu As IntPtr
lngHwnd = Me.Handle
If lngHwnd 0 Then
lngHmenu = GetSystemMenu(lngHwnd, False)
RemoveMenu(lngHmenu, 0, MF_BYPOSITION) '这里的0代表菜单中从上往下数第一个菜单项
End If
End Sub
Private Sub UserForm_Initialize_onmove() '恢复窗体移动
Dim lngHwnd As IntPtr
Dim lngHmenu As IntPtr
lngHwnd = Me.Handle
If lngHwnd 0 Then
lngHmenu = GetSystemMenu(lngHwnd, True)
RemoveMenu(lngHmenu, 0, MF_BYPOSITION) '这里的0与禁止代码中的数值同步，原因时虽然表面上删除了菜单项，实则为隐藏了菜单项，各个菜单的索引值并没有变，所以0依然代表初始菜单的第一个菜单项，即被删除的那个菜单项
End If
End Sub
然后如果你的窗口菜单是动态变化的，建议声明常数：
Const MF_BYPOSITION As Integer = H0
然后使用相关的Windows功能的常数进行删除菜单。常数需要自行查看winuser.h头文件
如果找不到该头文件，可以看这里：网页链接
其余信息详见MSDN：网页链接
最后说一下，不建议前面网友说的重写WndProc的方法，因为这样拦截标题栏点击消息会导致窗体本身的菜单也无法显示出来，有损窗体功能，并且像双击左上角图标关闭窗体这样的功能也会跟着拦截消息的操作一起被吞掉。
vb.net 在Win窗体中如何实现图标或按钮的拖放功能。
VB.NET做的窗体托盘，可以把窗体缩小到任务栏图标，点右键可以触发事件-VB.NET do form tray can form down to the taskbar icon, point right to trigger events
VB.NET我要用鼠标轨迹画一个矩形框 然后选中控件。就像星际和魔兽争霸里对部队单位的选中一样~等大神回答
这个类继承自Panel，把它加到你的项目里面，先运行一下，然后从工具箱里把它拖到窗体上，然后再向里面添加其它控件就可以了，支持Shift加选，Alt减选
Imports System.Linq
Imports System.Collections
Public Class MyPanel
Inherits Panel
' 选择模式，相交还是包含
Enum SelectMode
Intersects
Contains
End Enum
Dim down As New Point(-1, -1)
Dim rect As Rectangle
Dim selected As New List(Of Control)
Dim editting As IEnumerable(Of Control)
Dim mode As SelectMode = SelectMode.Contains
Dim shift, alt As Boolean
Public Sub New()
Me.DoubleBuffered = True
End Sub
Protected Overrides Sub OnMouseDown(e As MouseEventArgs)
MyBase.OnMouseDown(e)
down = e.Location
editting = selected.ToArray().ToList()
OnMouseMove(e)
End Sub
Protected Overrides Sub OnMouseMove(e As MouseEventArgs)
MyBase.OnMouseMove(e)
If e.Button = Windows.Forms.MouseButtons.Left Then
Dim loc As New Point(Math.Min(down.X, e.X), Math.Min(down.Y, e.Y))
Dim size As New Size(Math.Abs(down.X - e.X), Math.Abs(down.Y - e.Y))
rect = New Rectangle(loc, size)
Dim cs As New List(Of Control)
For Each c In Controls
cs.Add(c)
Next
Dim a = cs.Where(Function(n As Control) (mode = SelectMode.Contains And rect.Contains(n.Bounds)) Or (mode = SelectMode.Intersects And rect.IntersectsWith(n.Bounds)))
If shift Then editting = a.Union(selected) Else If alt Then editting = selected.Except(a) Else editting = a
Invalidate()
End If
End Sub
Protected Overrides Sub OnMouseUp(e As MouseEventArgs)
MyBase.OnMouseUp(e)
down = New Point(-1, -1)
selected = editting.ToList()
editting = Nothing
Invalidate()
End Sub
Protected Overrides Function ProcessKeyPreview(ByRef m As Message) As Boolean
Dim KeyCode As Keys = CInt(m.WParam) And CInt(Keys.KeyCode)
Dim d As Boolean
If m.Msg = H100 Or m.Msg = H104 Then d = True Else If m.Msg = H101 Or m.Msg = H105 Then d = False Else Return MyBase.ProcessKeyPreview(m)
If KeyCode = Keys.ShiftKey Then
shift = d
ElseIf KeyCode = Keys.Menu Then
alt = d
End If
Return MyBase.ProcessKeyPreview(m)
End Function
Protected Overrides Sub OnPaint(e As PaintEventArgs)
MyBase.OnPaint(e)
For Each c As Control In IIf(editting Is Nothing, selected, editting)
e.Graphics.DrawRectangle(New Pen(Color.Gray) With {.DashStyle = Drawing2D.DashStyle.DashDot}, c.Left - 1, c.Top - 1, c.Width + 1, c.Height + 1)
Next
If (down.X 0) Then e.Graphics.DrawRectangle(New Pen(Color.Gray) With {.DashStyle = Drawing2D.DashStyle.DashDot}, rect)
End Sub
End Class
如何在VB.NET中限制窗体移动
VB中就有呀叫MDI窗体，你选择“工程—添加MDI窗体”就可以了，然后把你刚刚的FORM1窗体设为MDI的子窗体就在它的属性里MDIChild设为True就可以了
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