当我添加到具有Backgroudimage的面板时按钮闪烁 [英] Button Flicker When I Add To Panel With Backgroudimage

问题描述

这是我面临的问题



我有一个面板添加了一个面板让我们称之为PanelFloorPlan



当我将所有表格（按钮）刷新到PanelFloorPlan（使用计时器）时，按钮闪烁。当我的PanelFloorPlan具有背景图像时，它变得最糟糕。我尝试过Me.PanelFloorPlan.SuspendLayout（）和Me.PanelFloorPlan.ResumeLayout（）。但它不起作用。



我试过Me.DoubleBuffered = True但它仍然是一样的。



请帮助！谢谢。

Here is the issue i am facing

I have a form with a Panel added let's call it PanelFloorPlan

When i refresh all my Tables (Buttons) into the PanelFloorPlan (Using Timer), the Button Flicker. It gets worst when my PanelFloorPlan has a Background Image. I have tried "Me.PanelFloorPlan.SuspendLayout()" and "Me.PanelFloorPlan.ResumeLayout()". But it's not working.

I have tried "Me.DoubleBuffered = True" but it's still the same.

Please Help! Thanks.

Private Sub frmForm_Load(sender As System.Object, e As System.EventArgs) Handles MyBase.Load
        Timer.Interval = 3000
        Timer.Enabled = True
        Me.DoubleBuffered = True
        GetTableList()  
        PanelFloorPlan.BackgroundImage = Image.FromFile("c:\FloorPlan.jpg")  
End Sub  
  
Private Sub GetTableList()  
        Me.PanelFloorPlan.SuspendLayout()  
        Me.PanelFloorPlan.Controls.Clear()  
        Dim strSelectCmd As String = "SQL Command"  
        Try  
            sqlCmd = New SqlClient.SqlCommand(strSelectCmd, sqlConn)  
            If Not sqlConn.State = ConnectionState.Open Then  
                sqlConn.Open()  
            End If  
            sqlRdr = sqlCmd.ExecuteReader()  
            While sqlRdr.Read()  
                'Define Btn and Set Parameters to the Button  
                Dim Btn As New Button  
                Btn.Name = sqlRdr("TableName").ToString  
                'Add Buttons to Form  
                Me.PanelFloorPlan.Controls.Add(Btn)  
            End While  
            Me.PanelFloorPlan.ResumeLayout()  
            sqlRdr.Close()  
            sqlConn.Close()  
        Catch ex As Exception  
            MessageBox.Show("GetTableList Error : " & ex.Message)  
            sqlConn.Close()  
        End Try  
 End Sub  
  
Private Sub Timer_Tick(sender As System.Object, e As System.EventArgs) Handles Timer.Tick  
        GetTableList()  
End Sub  

推荐答案

我也有这个问题，我通过创建一个继承自Panel的类并添加了以下代码来解决它

I had this problem too and i solved it by creating a class that inherits from Panel and added the following code

Public Class myPanel
    Inherits Panel

    Public Sub New()
        MyBase.New()
        Me.SetStyle(ControlStyles.UserPaint, True)
        Me.SetStyle(ControlStyles.AllPaintingInWmPaint, True)
        Me.SetStyle(ControlStyles.OptimizedDoubleBuffer, True)
    End Sub

    Protected Overrides Sub OnScroll(se As ScrollEventArgs)
        Me.Invalidate()

        MyBase.OnScroll(se)
    End Sub
    Protected Overrides ReadOnly Property CreateParams() As CreateParams
        Get
            Dim cp As CreateParams = MyBase.CreateParams
            cp.ExStyle = cp.ExStyle Or &H2000000
            ' WS_CLIPCHILDREN
            Return cp
        End Get
    End Property

这样做会重建你的项目并使用myPanel控制来控制面板控制。

这对我有用。



我在论坛的某个地方找到了这个代码但是忘记了哪里（我希望这不是问题）

Do this rebuild your project and use myPanel control insteed of panel control.
That worked for me.

I found this code somewhere in a forum but idont remember where (i hope this is not a problem)

是的，这对我有用。谢谢。

Yes, this works for me. Thank you.

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