如何在C＃中截取Winforms控件/表单的屏幕截图？

我有一个winforms表单上的listview控件。 它填满了整个屏幕，但屏幕上显示的项目比屏幕更多。

如何将整个控件的屏幕截图视为可以在屏幕上显示listview的全部内容？ 因此，如果整个listview需要1000 x 4000像素，那么我想要一个该大小的图像/位图。

我该怎么做呢？ 当我尝试打印屏幕时，它只返回屏幕上的内容，屏幕外的任何内容都显示为灰色。

Answer 1

表单是控件，因此您应该能够将整个内容保存到位图，例如：

 var bm = new Bitmap(yourForm.Width, yourForm.Height); yourForm.DrawToBitmap(bm, bm.Size); bm.Save(@"c:\whatever.gif", ImageFormat.Gif); 

更新

DrawToBitmap仅绘制屏幕上的内容。 如果要绘制列表的全部内容，则必须遍历列表以查找内容的大小，然后绘制每个项目。 就像是：

 var f = yourControl.Font; var lineHeight = f.GetHeight(); // Find size of canvas var s = new SizeF(); using (var g = yourControl.CreateGraphics()) { foreach (var item in yourListBox.Items) { s.Height += lineHeight ; var itemWidth = g.MeasureString(item.Text, f).Width; if (s.Width < itemWidth) s.Width = itemWidth; } } using( var canvas = new Bitmap(s) ) using( var g = Graphics.FromImage(canvas) ) { var pt = new PointF(); foreach (var item in yourListBox.Items) { pt.Y += lineHeight ; g.DrawString(item.Text, f, Brushes.Black, pt); } canvas.Save(wherever); } 

Answer 2

除非你不喜欢爆炸，

 Private Declare Function BitBlt Lib "gdi32" _ (ByVal hDCDest As IntPtr, ByVal XDest As IntPtr, _ ByVal YDest As IntPtr, ByVal nWidth As IntPtr, _ ByVal nHeight As IntPtr, ByVal hDCSrc As IntPtr, _ ByVal XSrc As IntPtr, ByVal YSrc As IntPtr, _ ByVal dwRop As IntPtr) As IntPtr Private Declare Function GetWindowDC Lib "user32" _ (ByVal hWnd As IntPtr) As IntPtr Private Declare Function ReleaseDC Lib "user32" _ (ByVal hWnd As IntPtr, ByVal hdc As IntPtr) As IntPtr Private Sub Blast() Dim dc As IntPtr dc = GetWindowDC(Me.Handle) Dim bm As Bitmap = New Bitmap(Me.Width, Me.Height) Dim g As Graphics = Graphics.FromImage(bm) Const vbSrcCopy = &HCC0020 Dim gdc = g.GetHdc() BitBlt(gdc, 0, 0, Me.Width, Me.Height, dc, 0, 0, vbSrcCopy) g.ReleaseHdc() bm.Save("C:\yourfile.bmp", System.Drawing.Imaging.ImageFormat.Bmp) ReleaseDC(Me.Handle, dc) End Sub