WPF 打印图片

效果如图

打印结果

private string outputDic { get { return $"{AppDomain.CurrentDomain.BaseDirectory}\\Temp\\"; } }

private void PrintImage(object sender, RoutedEventArgs e)
{
	//将控件imageBorder的画面输出图片
	var outputPath = GetPicFromControl(imageBorder as FrameworkElement);
	//打印
	Print(outputPath);
	//删除图片
	File.Delete(outputPath);
}

private string GetPicFromControl(FrameworkElement element)
{
	//96为显示器DPI
	double dpiX = 96;
	double dpiY = 96;

	var bitmapRender = new RenderTargetBitmap((int)element.ActualWidth, (int)element.ActualHeight, dpiX, dpiY, PixelFormats.Pbgra32);//位图 宽度  高度   水平DPI  垂直DPI  位图的格式    高度+100保证整个图都能截取
	//控件内容渲染RenderTargetBitmap
	bitmapRender.Render(element);
	BitmapEncoder encoder = new JpegBitmapEncoder();
	var outputPath = $"{outputDic}\\{Guid.NewGuid().ToString()}.jpg";
	//对于一般的图片，只有一帧，动态图片是有多帧的。
	encoder.Frames.Add(BitmapFrame.Create(bitmapRender));//添加图
	if (!Directory.Exists(System.IO.Path.GetDirectoryName(outputPath)))
		Directory.CreateDirectory(System.IO.Path.GetDirectoryName(outputPath));
	using (var file = File.Create(outputPath))//存储文件
		encoder.Save(file);
	return outputPath;
}

private void Print(string outputPath)
{
	try
	{
		this.Cursor = Cursors.Wait;
		var bi = new BitmapImage();
		bi.BeginInit();
		bi.CacheOption = BitmapCacheOption.OnLoad;
		//加载图片
		bi.UriSource = new Uri(outputPath);
		bi.EndInit();

		var vis = new DrawingVisual();
		using (var dc = vis.RenderOpen())
		{
			dc.DrawImage(bi, new Rect { Width = bi.Width, Height = bi.Height });
		}

		var pdialog = new PrintDialog();
		if (pdialog.ShowDialog() == true)
		{
			pdialog.PrintVisual(vis, "My Image");
		}
	}
	finally
	{
		this.Cursor = Cursors.AppStarting;
	}
}

打印表单，参考用WPF实现打印及打印预览

打印图片的思路是将控件的画面保存为图片->打印图片
打印表单的思路是xaml模板+数据->打印表单

示例代码

PrintImage
打印表单的代码PrintTable

参考资料

Load image from file and print it using WPF… how?