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Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim memoryImage As Bitmap
Dim myGraphics As Graphics = Me.CreateGraphics()
Dim s As Size = New Size(1280, 1024)
memoryImage = New Bitmap(s.Width, s.Height, myGraphics)
Dim memoryGraphics As Graphics = Graphics.FromImage(memoryImage)
memoryGraphics.CopyFromScreen(0, 0, 0, 0, s) '在此换成Picturebox的坐标
memoryImage.Save("aa.jpg")
End Sub
End Class