Use ControlPaint class
ControlPaint.DrawReversibleLine Method
See here: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemwindowsformscontrolpaintclasstopic.asp
ControlPaint.DrawReversibleLine Method
See here: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemwindowsformscontrolpaintclasstopic.asp
上MSDN (http://msdn.microsoft.com/default.aspx)
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