C# 打印屏幕活动窗口

我目前正在尝试使用 Visual C# 打印活动窗口的屏幕。我有这个代码：

SaveFileDialog saveImageDialog = new SaveFileDialog();
saveImageDialog.Title = "Select output file:";
saveImageDialog.Filter = "JPeg Image|*.jpg|Bitmap Image|*.bmp|Gif Image|*.gif";
//saveImageDialog.FileName = printFileName;
if (saveImageDialog.ShowDialog() == DialogResult.OK)
{
    // Set the bitmap object to the size of the screen
    bmpScreenshot = new Bitmap(this.Bounds.Width, this.Bounds.Height, PixelFormat.Format32bppArgb);
    // Create a graphics object from the bitmap
    gfxScreenshot = Graphics.FromImage(bmpScreenshot);
    // Take the screenshot from the upper left corner to the right bottom corner
    gfxScreenshot.CopyFromScreen(this.Bounds.X, this.Bounds.Y, 0, 0, this.Bounds.Size, CopyPixelOperation.SourceCopy);
    // Save the screenshot to the specified path that the user has chosen
    bmpScreenshot.Save(saveImageDialog.FileName, ImageFormat.Png);
}

但此代码也捕获了 SaveImageDialog。有办法解决这个问题吗？多谢。

最简单的方法是切换代码：

// Set the bitmap object to the size of the screen
bmpScreenshot = new Bitmap(this.Bounds.Width, this.Bounds.Height,
                           PixelFormat.Format32bppArgb);
// Create a graphics object from the bitmap
gfxScreenshot = Graphics.FromImage(bmpScreenshot);
// Take the screenshot from the upper left corner to the right bottom corner
gfxScreenshot.CopyFromScreen(this.Bounds.X, this.Bounds.Y, 0, 0,
                             this.Bounds.Size, CopyPixelOperation.SourceCopy);

SaveFileDialog saveImageDialog = new SaveFileDialog();
saveImageDialog.Title = "Select output file:";
saveImageDialog.Filter = "JPeg Image|*.jpg|Bitmap Image|*.bmp|Gif Image|*.gif";
//saveImageDialog.FileName = printFileName;
if (saveImageDialog.ShowDialog() == DialogResult.OK)
{
    // Save the screenshot to the specified path that the user has chosen
    bmpScreenshot.Save(saveImageDialog.FileName, ImageFormat.Png);
}

首先创建屏幕截图，然后显示保存对话框，如果单击“确定”关闭对话框，则将其保存到光盘。

问题是，在您的代码中，程序没有时间重新绘制您的表单。如果您想保留代码的结构，您需要给它一些时间来处理待处理的事件，可能通过调用应用程序.DoEvents.