silverlight 调用默认打印机

打印辅助类。

首先添加

using System.Windows.Printing;

命名空间

public class SilverPrint
    {
        //设置每一项之间的间距
        int listPrintIndex = 0;
        private List<PrintStr> listStr = null;
        public void Print(List<PrintStr> strs)
        {
            listStr = strs;
            PrintDocument printDoc = new PrintDocument();
            printDoc.PrintPage += OnPrintPage;
            PrinterFallbackSettings settings = new PrinterFallbackSettings();
            settings.ForceVector = true;
            printDoc.Print("dd", settings, true);//dd是文档的名字
        }
        public void OnPrintPage(object sender, PrintPageEventArgs e)
        {
            Canvas printSurface = new Canvas();
            //得到最顶端位置
            double topPosition = e.PageMargins.Top;
            //遍历当前的ListBox.Items
            while (listPrintIndex < listStr.Count)
            {
                //实例化TextBlock用来存放每一行的值
                TextBlock txt = new TextBlock();
                txt.FontSize = listStr[listPrintIndex].FontSize;
                txt.Text = listStr[listPrintIndex].Content;
                double measuredHeight = txt.ActualHeight;
                //如果打印的当前行高度不合适的话，则进行分页
                if (measuredHeight > (e.PrintableArea.Height - topPosition))
                {
                    e.HasMorePages = true;
                    topPosition = e.PageMargins.Top;
                    break;
                }
                //设置TextBlock在Canvas中的位置
                txt.SetValue(Canvas.TopProperty, topPosition);
                txt.SetValue(Canvas.LeftProperty, e.PageMargins.Left);
                //将TextBlock添加到打印的元素中去
                printSurface.Children.Add(txt);
                listPrintIndex++;
                //追加高度
                topPosition = topPosition + measuredHeight;
            }
            e.PageVisual = printSurface;
        }
    }
    //打印内容类
    public class PrintStr
    {
       public string Content { set; get; }
       public int FontSize { set; get; }
       public PrintStr(string str,int size=10)
       {
           this.Content = str;
           this.FontSize = size;
       }
    }

打印直接调用

new SilverPrint().Print(printStrs);

如果是silverlight5.0之前会弹出打印预览。。。如果是silverlight5.0 允许浏览器外允许 增加权限。就可以不用弹出打印预览，直接打印了。