vb.net图像处理

[小猪打滚]

以下代码为什么不能在窗体显示图像？而把Form_load事件改为Form_paint事件图像就可以在窗体显示呢？

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        Dim graph As Graphics = Me.CreateGraphics
        Dim pencil1 As Pen = New Pen(Color.Blue, 2)
        Dim pencil2 As Pen = New Pen(Color.Red, 3)
        Dim x1, y1, y As Single
        graph.TranslateTransform(60, 60)
        pencil2.SetLineCap(Drawing2D.LineCap.Flat, Drawing2D.LineCap.ArrowAnchor, Drawing2D.DashCap.Flat)
        graph.DrawLine(pencil2, 100, 150, 100, 5)
        graph.DrawLine(pencil2, 20, 100, 180, 100)
        x1 = 30
        y1 = 8
        For i = 31 To 170
            y = (100 - (-10 + (i - 50) / 5) ^ 2) / 2 + 50
            graph.DrawLine(pencil1, x1, y1, i, y)
            x1 = i
            y1 = y
        Next
        graph.Dispose()
    End Sub

[赵4老师]

Form_load事件发生时，窗体还没创建完呢。我猜。

[一笑拔剑]

方法二、调用某控件或窗体的CreateGraphics方法 调用某控件或窗体的CreateGraphics方法以获取对Graphics对象的引用，该对象表示该控件或窗体的绘图图面。如果想在已存在的窗体或控件上绘图，通常会使用此方法。 CreateGraphics本来就需要你窗体paint以后才能用的 paint这个时间在load事件之后. 事件的顺序： Form Events: Construtor Load Layout Activated Paint­ Closing Closed Deactivate Dispose

[闪星2]

要是vb6.0的话，在显示图片之前加个me.show就可以，.net你试试？