VB.NET画图是不能设置双缓冲的，双缓冲是指窗体，从来没说是针对控件。
创新互联是一家专业提供沙县企业网站建设,专注与成都网站设计、做网站、H5页面制作、小程序制作等业务。10年已为沙县众多企业、政府机构等服务。创新互联专业网站建设公司优惠进行中。
不用graphic.clear清理重画就不会闪烁。你可以先把容器删了再重新建立一个再去画。
简单举例：
Graphics g;
Pen p;
Panel pl;
构造函数初始化：
p=new Pen(Color.Red,2);
pl=panel1;
造成闪烁的画法：
g=pl.CreateGraphics();
g.Clear(SystemColor.ButtonFace);
//.....画新的
不会闪烁的办法：
this.Controls.ReMoveAt(panel1);
pl=new Panel();
pl.Name="panel1";
//....创建容器控件
this.Controls.Add(pl);
//继续画
代码：
Public Class Form1
'*********************************************************************
'作者：章鱼哥，QQ：3107073263 群：309816713
'如有疑问或好的建议请联系我，大家一起进步
'*********************************************************************
'绘制圆角矩形函数
Private Function GetRoundedRectPath(ByVal rect As Rectangle, ByVal radius As Integer) As System.Drawing.Drawing2D.GraphicsPath
rect.Offset(-1, -1)
Dim RoundRect As New Rectangle(rect.Location, New Size(radius - 1, radius - 1))
Dim path As New System.Drawing.Drawing2D.GraphicsPath
path.AddArc(RoundRect, 180, 90) '左上角
RoundRect.X = rect.Right - radius '右上角
path.AddArc(RoundRect, 270, 90)
RoundRect.Y = rect.Bottom - radius '右下角
path.AddArc(RoundRect, 0, 90)
RoundRect.X = rect.Left '左下角
path.AddArc(RoundRect, 90, 90)
path.CloseFigure()
Return path
End Function
'绘制矩形
Private Sub DrawingRect()
Dim g As Graphics = Me.CreateGraphics
Dim Pen As New Pen(Brushes.DarkRed, 2)
Dim Hei As Integer = Me.Height
Dim Wid As Integer = Me.Width
'矩形的位置和长宽随着窗体的变化而改变
Dim Rec As New Rectangle(Int(Wid / 5), Int(Hei / 5), Int(Wid / 2), Int(Hei / 2))
' g.DrawRectangle(Pen, Rec)
'清楚现有的矩形
g.Clear(Me.BackColor)
g.DrawPath(Pen, GetRoundedRectPath(Rec, 30))
End Sub
Private Sub Form1_Paint(ByVal sender As System.Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
DrawingRect()
End Sub
Private Sub Form1_SizeChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.SizeChanged
Me.Invalidate() '此函数可引发Paint事件
End Sub
End Class
效果截图:
原窗口：
缩小后：
VB.net与VB不同。
VB.net已经有专门绘图的类。
可以定义笔刷然后用Drawing类中的方法绘制。
Private Sub DrawEllipse()
Dim myPen As New System.Drawing.Pen(System.Drawing.Color.Red)
Dim formGraphics as System.Drawing.Graphics
formGraphics = Me.CreateGraphics()
formGraphics.DrawEllipse(myPen, New Rectangle(0,0,200,300))
myPen.Dispose()
formGraphics.Dispose()
End Sub
Private Sub DrawRectangle()
Dim myPen As New System.Drawing.Pen(System.Drawing.Color.Red)
Dim formGraphics as System.Drawing.Graphics
formGraphics = Me.CreateGraphics()
formGraphics.DrawRectangle(myPen, New Rectangle(0,0,200,300))
myPen.Dispose()
formGraphics.Dispose()
End Sub
