打印辅助类。

首先添加

using System.Windows.Printing;

命名空间

1 public class SilverPrint 2     { 3         //设置每一项之间的间距 4         int listPrintIndex = 0; 5         private List
     
       listStr = null; 6         public void Print(List
      
        strs) 7         { 8             listStr = strs; 9             PrintDocument printDoc = new PrintDocument();10             printDoc.PrintPage += OnPrintPage;11             PrinterFallbackSettings settings = new PrinterFallbackSettings();12             settings.ForceVector = true;13             printDoc.Print("dd", settings, true);//dd是文档的名字14         }15         public void OnPrintPage(object sender, PrintPageEventArgs e)16         {17             Canvas printSurface = new Canvas();18             //得到最顶端位置19             double topPosition = e.PageMargins.Top;20             //遍历当前的ListBox.Items21             while (listPrintIndex < listStr.Count)22             {23                 //实例化TextBlock用来存放每一行的值24                 TextBlock txt = new TextBlock();25                 txt.FontSize = listStr[listPrintIndex].FontSize;26                 txt.Text = listStr[listPrintIndex].Content;27                 double measuredHeight = txt.ActualHeight;28                 //如果打印的当前行高度不合适的话，则进行分页29                 if (measuredHeight > (e.PrintableArea.Height - topPosition))30                 {31                     e.HasMorePages = true;32                     topPosition = e.PageMargins.Top;33                     break;34                 }35                 //设置TextBlock在Canvas中的位置36                 txt.SetValue(Canvas.TopProperty, topPosition);37                 txt.SetValue(Canvas.LeftProperty, e.PageMargins.Left);38                 //将TextBlock添加到打印的元素中去39                 printSurface.Children.Add(txt);40                 listPrintIndex++;41                 //追加高度42                 topPosition = topPosition + measuredHeight;43             }44             e.PageVisual = printSurface;45         }46     }47     //打印内容类48     public class PrintStr49     {50        public string Content { set; get; }51        public int FontSize { set; get; }52        public PrintStr(string str,int size=10)53        {54            this.Content = str;55            this.FontSize = size;56        }57     }
      
     

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。