C＃打印屏幕活動窗口

Question

我目前正在嘗試使用Visual C＃打印屏幕活動窗口。我有這樣的代碼：

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); 
} 

但是，這段代碼也捕獲了SaveImageDialog。任何解決這個問題？非常感謝。

Answer 1

最簡單的方法將是切換代碼：

// 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); 
} 

首先創建截圖和比顯示保存對話框，並將其保存到光盤，如果對話框用OK關閉。

問題是，在您的代碼中，程序沒有時間重新繪製表單。如果你想保留你的代碼結構，你需要給它一些時間來處理未決事件，可能通過調用Application.DoEvents。