/// <summary>
        /// 打印次数
        /// </summary>
        private int _PrintCount;

        /// <summary>
        /// 打印元素
        /// </summary>
        Canvas printCanvas = new Canvas();

        /// <summary>
        /// 打印
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void btnSave_Click(object sender, RoutedEventArgs e)
        {
            if (Application.Current.IsRunningOutOfBrowser)
            {
                PrintDocument document = new PrintDocument();

                // tell the API what to print
                document.PrintPage += Document_PrintPage;
                document.EndPrint += Document_EndPrint;

                PrinterFallbackSettings setting = new PrinterFallbackSettings();
                setting.ForceVector = false;
                try
                {
                    _PrintCount = 0;
                    indicator.IsBusy = true;
                    //indicator.BusyContent = "正在处理，请稍候...";

                    rootPage.Children.Remove(rootPrint);
                    printCanvas.Children.Add(rootPrint);
                                     
                    document.Print("报表打印", setting, false);
                }
                catch
                {
                    MessageBox.Show("打印时发生了错误");
                }
            }
        }

        /// <summary>
        /// 页打印
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void Document_PrintPage(object sender, PrintPageEventArgs e)
        {
            if (PrintPages > 0)
            {
                printCanvas.Width = e.PrintableArea.Width;
                printCanvas.Height = e.PrintableArea.Height;
                rootPrint.Width = e.PrintableArea.Width;
                
                //定义一个打印的元素
                e.PageVisual = printCanvas;

                //得到最顶端位置
                double topPosition = e.PrintableArea.Height * _PrintCount;

                //位移
                Canvas.SetTop(rootPrint, topPosition * -1);
                _PrintCount++;

                bool hasPages = rootPrint.ActualHeight - topPosition > e.PrintableArea.Height;

                //打印多份
                if (PrintPages > 1)
                {
                    e.HasMorePages = true;

                    if (!hasPages)
                    {
                        PrintPages--;
                        _PrintCount = 0;
                    }
                }
                else
                {
                    e.HasMorePages = hasPages;
                }
            }
            else
            {
                e.HasMorePages = false;
            }
        }