Vb.net 在Framework 4.0中的ListView第一行上显示工具提示

我有一个WinForm应用程序，是用VB.Net在Framework 2.0中开发的，它在所有ListView对象上使用事件MouseMove在ListView的第一行上显示工具提示文本-据我所知，如果没有第三方工具，ColumnHeader上不可能有工具提示

问题是，自从我将应用程序转换为Framework4.0后，这个“技巧”就不起作用了，工具提示也不再显示

有人知道一种解决方案，或者更好的方法，在ListView列标题上显示工具提示吗

以下是我的代码片段：

Private Sub ShowTooltip(ByVal sender As Object, ByVal e As MouseEventArgs) 
    Handles myListView.MouseMove
  Dim iColumn As System.Int32 = FindListViewColumnHeader(e.X, e.Y)
  If Me.myListView.Columns.Count > 0 AndAlso iColumn >= 0 AndAlso
     iColumn <= Me.myListView.Columns.Count - 1 Then
         Me.myToolTip.Active = True
         Me.myToolTip.UseAnimation = True
         Me.myToolTip.UseFading = True
         Me.myToolTip.AutomaticDelay = 10000
         Me.myToolTip.AutoPopDelay = 10000
         Me.myToolTip.InitialDelay = 0
         Me.myToolTip.ReshowDelay = 2000

         Dim sTooltipText As System.String = SomeText(...)
         If sTooltipText <> DirectCast(Me.myToolTip.Tag, System.String) Then
                 Me.myToolTip.Tag = sTooltipText
                 Me.myToolTip.SetToolTip(Me.myListView, sTooltipText)
         End If
  Else
         Me.myToolTip.Active = False
  End If
End Sub

Protected Overridable Function FindListViewColumnHeader(ByVal X As System.Int32, 
       ByVal Y As System.Int32) As System.Int32
   If Y > 20 And Y < 40 Then
       Dim iCount As System.Int32
       Dim iLeft As System.Int32
       For iCount = 0 To myListView.Columns.Count - 1
           iLeft = iLeft + myListView.Columns(iCount).Width
           If X <= iLeft Then
               Return iCount
               Exit For
           End If
       Next
       Return iCount
   Else
       Return -1
   End If
End Function

而myListView是

Protected WithEvents myListView As System.Windows.Forms.ListView

请注意，如问题所述：

---

，

ShowItemToolTips

已设置为True。

您可以获取标题列的句柄并将其子类化：

<DllImport("user32.dll", SetLastError:=True)> _
Private Shared Function SetWindowLong(ByVal hWnd As IntPtr, ByVal nIndex As Integer, ByVal newProc As Win32WndProc) As IntPtr

End Function

<DllImport("user32.dll")> _
Private Shared Function CallWindowProc(lpPrevWndFunc As IntPtr, hWnd As IntPtr, Msg As UInteger, wParam As Integer, lParam As Integer) As Integer
End Function

<DllImport("user32.dll", SetLastError:=True, CharSet:=CharSet.Auto)> _
Private Shared Function SendMessage(ByVal hWnd As IntPtr, ByVal Msg As UInteger, ByVal wParam As Integer, ByVal lParam As Integer) As IntPtr
End Function

Private Delegate Function Win32WndProc(ByVal hWnd As IntPtr, ByVal Msg As UInteger, ByVal wParam As Integer, ByVal lParam As Integer) As Integer

Private Const GWL_WNDPROC As Integer = -4
Private Const WM_LBUTTONDOWN As Integer = &H201
Private Const WM_MOUSEMOVE As Integer = &H200

Private oldWndProc As IntPtr = IntPtr.Zero
Private newWndProc As Win32WndProc = Nothing

Private Sub SubclassHWnd(ByVal hWnd As IntPtr)
    'hWnd is the window you want to subclass...,
    'create a new delegate for the new wndproc
    newWndProc = New Win32WndProc(AddressOf MyWndProc)
    'subclass
    oldWndProc = SetWindowLong(hWnd, GWL_WNDPROC, newWndProc)
End Sub

Private Function MyWndProc(ByVal hWnd As IntPtr, ByVal Msg As UInteger, ByVal wParam As Integer, ByVal lParam As Integer) As Integer

    Select Case Msg
        Case WM_LBUTTONDOWN
            'The lower 2 bytes of lParam are the x coordinate 
            'and the higher 2 bytes the y.
            ToolTip1.Show("My tooltip", ListView1, lParam And &HFFFF, (lParam >> 16) And &HFF, 2000)
            Exit Select
        Case Else
            Exit Select
    End Select

    Return CallWindowProc(oldWndProc, hWnd, Msg, wParam, lParam)
End Function

为了方便起见，我使用了

WM_LBUTTONDOWN

事件。您可以使用

WM_MOUSEMOVE

事件检查鼠标所在的列等。。。并显示工具提示

---

子类化的代码：

ColumnHeader不会生成MouseMove或MouseHover类型的事件，因此即使LV也不知道鼠标位于头部分上。事实上，如果您在对象浏览器中查看，它的唯一事件是

Disposed

。工具提示提供程序不适用于

ColumnHeader

，因此我想知道什么是

ToolTipText（）

？ListViewItems具有该属性，但不具有标题<代码>lsRecords是个谜too@Plutonix我想代码是可疑的。什么是lsRecords？看起来应该是myListView。我更正了代码片段，lsRecords是个错误。我的问题是，在Framework4.0中，工具提示也不适用于ListViewItems。LVI有自己的内置工具提示文本属性。我看不出它是如何工作的：

DirectCast（Me.myListView.Columns（iColumn），ColumnHeader.ToolTipText（）

不会编译，因为

ColumnHeader

上没有

ToolTipText

提供的代码不会在NET2.0中的ColumnHeader上显示工具提示。当鼠标移到某个项目或子项目上时，它会立即显示，但当鼠标移到标题上时，它会立即消失。您的解决方案非常有效，谢谢！我只是做了一个小的修正来正确读取x坐标：lParam和&HFFFF。

<DllImport("user32.dll", SetLastError:=True)> _
Private Shared Function SetWindowLong(ByVal hWnd As IntPtr, ByVal nIndex As Integer, ByVal newProc As Win32WndProc) As IntPtr

End Function

<DllImport("user32.dll")> _
Private Shared Function CallWindowProc(lpPrevWndFunc As IntPtr, hWnd As IntPtr, Msg As UInteger, wParam As Integer, lParam As Integer) As Integer
End Function

<DllImport("user32.dll", SetLastError:=True, CharSet:=CharSet.Auto)> _
Private Shared Function SendMessage(ByVal hWnd As IntPtr, ByVal Msg As UInteger, ByVal wParam As Integer, ByVal lParam As Integer) As IntPtr
End Function

Private Delegate Function Win32WndProc(ByVal hWnd As IntPtr, ByVal Msg As UInteger, ByVal wParam As Integer, ByVal lParam As Integer) As Integer

Private Const GWL_WNDPROC As Integer = -4
Private Const WM_LBUTTONDOWN As Integer = &H201
Private Const WM_MOUSEMOVE As Integer = &H200

Private oldWndProc As IntPtr = IntPtr.Zero
Private newWndProc As Win32WndProc = Nothing

Private Sub SubclassHWnd(ByVal hWnd As IntPtr)
    'hWnd is the window you want to subclass...,
    'create a new delegate for the new wndproc
    newWndProc = New Win32WndProc(AddressOf MyWndProc)
    'subclass
    oldWndProc = SetWindowLong(hWnd, GWL_WNDPROC, newWndProc)
End Sub

Private Function MyWndProc(ByVal hWnd As IntPtr, ByVal Msg As UInteger, ByVal wParam As Integer, ByVal lParam As Integer) As Integer

    Select Case Msg
        Case WM_LBUTTONDOWN
            'The lower 2 bytes of lParam are the x coordinate 
            'and the higher 2 bytes the y.
            ToolTip1.Show("My tooltip", ListView1, lParam And &HFFFF, (lParam >> 16) And &HFF, 2000)
            Exit Select
        Case Else
            Exit Select
    End Select

    Return CallWindowProc(oldWndProc, hWnd, Msg, wParam, lParam)
End Function

    'LVM_GETHEADER = &H101F
    Dim hwndHeader As IntPtr = SendMessage(ListView1.Handle, &H101F, 0, 0)
    SubclassHWnd(hwndHeader)