WPF 打印

先说一下思路：把控件保存为图片，然后把图片保存为xps文件，然后打印xps文件。保存为xps文件，下次再打印就不用重新调整打印设置了。

控件保存为图片的方法：

            //提取控件中的图像
            RenderTargetBitmap bmp = new RenderTargetBitmap((int)控件.ActualWidth, (int)控件.ActualHeight, 96d, 96d, PixelFormats.Pbgra32);
            bmp.Render(控件);
            BitmapEncoder encoder = new PngBitmapEncoder();
            encoder.Frames.Add(BitmapFrame.Create(bmp));

            string path = "指定文件路径 *.png";

            using (FileStream file = new FileStream(path , FileMode.Create, FileAccess.Write))
            {
                encoder.Save(file);
            }

保存xps的方法

            string path =  "Data/xps/" + imgId + ".xps";
            if (!Directory.Exists( "Data/xps"))
                Directory.CreateDirectory("Data/xps");
            
            PageContent pageContent = new PageContent();
            FixedPage fixedPage = new FixedPage();
            Image img = new Image();
            img.Width = App.Photo_Width;
            img.Height = App.Photo_Height;
            img.Stretch = Stretch.Fill;

            img.Source = Printer.GetImage( "Data/NotePhotos/" + imgId + ".png");
            FixedPage.SetLeft(img, 0);
            FixedPage.SetTop(img, 0);
            fixedPage.Width = App.Photo_Height;
            fixedPage.Height = App.Photo_Width;
            img.RenderTransformOrigin = new Point(App.Photo_Height / (2 * App.Photo_Width), 0.5);
            img.RenderTransform = new RotateTransform(90);

            fixedPage.Children.Add((UIElement)img);
            Size sz = new Size(App.Photo_Height, App.Photo_Width);
            fixedPage.Measure(sz);
            fixedPage.Arrange(new Rect(new Point(), sz));
            fixedPage.UpdateLayout();
            ((System.Windows.Markup.IAddChild)pageContent).AddChild(fixedPage);

            XpsDocument doc = new XpsDocument(path, FileAccess.Write);
            XpsDocumentWriter writer = XpsDocument.CreateXpsDocumentWriter(doc);
            writer.Write(fixedPage);
            doc.Close();

上面的GetImage方法

/// <summary>
        /// 把文件读取到内存中，这样可以对文件进行其他操作
        /// </summary>
        /// <param name="url"></param>
        /// <returns></returns>
        public static BitmapSource GetImage(string url)
        {
            try
            {
                using (BinaryReader reader = new BinaryReader(File.Open(url, FileMode.Open)))
                {
                    FileInfo fi = new FileInfo(url);
                    byte[] bytes = reader.ReadBytes((int)fi.Length);
                    reader.Close();
                    BitmapImage bitmapImage = new BitmapImage();
                    bitmapImage.BeginInit();
                    bitmapImage.StreamSource = new MemoryStream(bytes);
                    bitmapImage.EndInit();
                    bitmapImage.CacheOption = BitmapCacheOption.OnLoad;
                    return bitmapImage;
                }
            }
            catch { return null; }
        }

打印

 /// <summary>
        /// 打印（使用默认打印机）
        /// </summary>
        /// <param name="imgId">要打印的图片编号</param>
        /// <param name="width">宽度</param>
        /// <param name="height">高度</param>
        public static void Print(string imgId)
        {

            //获取选中项
            if (imgId != string.Empty)
            {
                string path =  "Data/xps/" + imgId + ".xps";
                if (File.Exists(path))
                {
                    //LocalPrintServer ps = new LocalPrintServer();
                    //如果已存在该文件，则打印 使用系统默认打印机
                    PrintQueue defaultPrintQueue = LocalPrintServer.GetDefaultPrintQueue();
                    try { PrintSystemJobInfo xpsPringtJob = defaultPrintQueue.AddJob(imgId + ".xps", path, false); }
                    catch { }
                    defaultPrintQueue.Dispose();
                }
                else
                {
                    PageContent pageContent = new PageContent();
                    FixedPage fixedPage = new FixedPage();

                    Image img = new Image();
                    img.Width = Photo_Width;
                    img.Height = Photo_Height;
                    img.Stretch = Stretch.Fill; //Stretch.Fill;
                    img.Source = GetImage("Data/NotePhotos/" + imgId + ".png");

                    FixedPage.SetLeft(img, 0);
                    FixedPage.SetTop(img, 0);
                    fixedPage.Width = Photo_Height;
                    fixedPage.Height =Photo_Width;
                    img.RenderTransformOrigin = new Point((Photo_Height / 2) / Photo_Width, 0.5);
                    img.RenderTransform = new RotateTransform(90);//旋转调整图片
                    fixedPage.Children.Add((UIElement)img);

                    Size sz = new Size(Photo_Height, Photo_Width);
                    fixedPage.Measure(sz);
                    fixedPage.Arrange(new Rect(new Point(), sz));
                    fixedPage.UpdateLayout();
                    ((System.Windows.Markup.IAddChild)pageContent).AddChild(fixedPage);

                    XpsDocument doc = new XpsDocument(path, FileAccess.Write);
                    XpsDocumentWriter writer = XpsDocument.CreateXpsDocumentWriter(doc);
                    writer.Write(fixedPage);
                    doc.Close();
                    PrintQueue defaultPrintQueue = LocalPrintServer.GetDefaultPrintQueue();

                    try { PrintSystemJobInfo xpsPringtJob = defaultPrintQueue.AddJob(imgId + ".xps", path, false); }
                    catch { }
                    defaultPrintQueue.Dispose();
                }
            }

        }

需要引用的一些命名空间：

using System.Printing;
using System.IO;
using System.Windows.Documents;
using System.Windows.Xps.Packaging;//添加引用=》ReachFramework
using System.Windows.Xps;