/// <summary>
/// 打印類
/// </summary>
public class PrintService
{
????public PrintService()
???{
??????//創建一個PrintDialog的實例
??????PrintDialog dlg = new PrintDialog();

??????//創建一個PrintDocument的實例
??????PrintDocument?docToPrint?= new PrintDocument();

??????//將事件處理函數添加到PrintDocument的PrintPage事件中
??????docToPrint.PrintPage += new System.Drawing.Printing.PrintPageEventHandler?????????????????(docToPrint_PrintPage);

??????//把PrintDialog的Document屬性設為上面配置好的PrintDocument的實例
??????dlg.Document = docToPrint;

??????//根據用戶的選擇，開始打印
??????if (dlg.ShowDialog() == System.Windows.Forms.DialogResult.OK)
?????{
????????docToPrint.Print();//開始打印
??????}
???}

???//設置打印機開始打印的事件處理函數
???private void docToPrint_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
??{
????????e.Graphics.DrawString("Hello, world!", new System.Drawing.Font("Arial", 16,??System.Drawing.FontStyle.Regular), System.Drawing.Brushes.Black, 100, 100);
????}
}

????在這就可以看出Winform與WPF打印的不同了，在WPF在PrintDocument是一個打印方法。WPF有兩種打印途徑，一種是第一種方法中的PrintVisual,另一種就是PrintDocument。

????第三種：具體步驟如下：

　　1．PrintDialog

　　This sample illustrates how to create an instance of a simple PrintDialog and then display it. The sample uses both Extensible Application Markup Language (XAML) and procedural code.

　 　這個示例演示了如何進行一個最簡單的打印工作，為此需要引入兩個dll：ReachFramework.dll和System.Printing。

　 InvokePrint方法只是顯示了一個PrintDialog打印框，并未進行打印工作：

　 PrintDialog pDialog = new PrintDialog();
???pDialog.PageRangeSelection = PageRangeSelection.AllPages;
???pDialog.UserPageRangeEnabled = true;
???pDialog.ShowDialog();

　 有 PrintableAreaHeight和PrintableAreaWidth兩個屬性，分別用來表示可打印區域的高和寬。

　 而對 PrintDialog的設置，可以保存在PrintTicket中，下次再打開PrintDialog，就不必重復進行設置了。

　 PrintDialog pDialog = new PrintDialog();
???PrintTicket pt = pDialog.PrintTicket;　　

　 同樣，選擇使用哪一臺打印機的設置，存放在PrintQueue中，下次再打開PrintDialog，也不用再次設置了。

　　PrintDialog pDialog = new PrintDialog();
????PrintQueue pq = pDialog.PrintQueue;　　　

　 如果要把特定的內容打印輸出，則需要調用PrintDialog的PrintVisual方法：

　　if ((bool)pDialog.ShowDialog().GetValueOrDefault())
???{
????????DrawingVisual vis = new DrawingVisual();
????????DrawingContext dc = vis.RenderOpen();
????????dc.DrawLine(new Pen(), new Point(0, 0), new Point(0, 1));
????????dc.Close();
????????pDialog.PrintVisual(vis, "Hello, world!");
?????}

　　我們能打印的，都是Visual類型的對象，其中UIElement派生于 Visual，從而我們可以打印所有Panel、控件和其它元素，最一般的方法是使用派生于Visual的DrawingVisual類，利用它的 RenderOpen方法生成DrawingContext對象，為其繪制圖形，最后使用PrintDialog的PrintVisual方法，輸出圖形 和文字。

　　注意到，pDialog.ShowDialog()返回的是可空類型?bool，為此需要使用 GetValueOrDefault將其轉為bool值，對于null值也會轉為false。

　　 2．EnumerateSubsetOfPrintQueues

　　 EnumerateSubsetOfPrintQueues shows how to use the EnumeratedPrintQueueTypes enumeration to get a subset of available print queues.

　　這個程序演示了如何得到本地和共享的所有打印機列表。為此，需要 使用到EnumeratedPrintQueueTypes枚舉中的Local和Shared兩個值，組合成一個數組，

　　 EnumeratedPrintQueueTypes[] enumerationFlags =

??????????????????????{EnumeratedPrintQueueTypes.Local,EnumeratedPrintQueueTypes.Shared};

　　作為參數傳遞到查詢方法GetPrintQueues中：

　　LocalPrintServer printServer = new LocalPrintServer();
????PrintQueueCollection printQueuesOnLocalServer?= printServer.GetPrintQueues(enumerationFlags);

　　接著就可 以對PrintQueueCollection進行遍歷了，獲取每一個的PrintQueue名稱和所在位置：

　 foreach (PrintQueue printer in printQueuesOnLocalServer)
???{
?????????Console.WriteLine(""tThe shared printer " + printer.Name + " is located at " + printer.Location + ""n");
???}

???下面就看我的方法了，先創建一個打印用的類：DataPaginator，它繼承了Document虛基類，并進行擴展，從而為我們的功能實現做鋪墊。

??public class DataPaginator : DocumentPaginator
????{
????????#region??屬性及字段
????????private DataTable dataTable;
????????private Typeface typeFace;
????????private double fontSize;
????????private double margin;
????????private int rowsPerPage;
????????private int pageCount;
????????private Size pageSize;

????????public override Size PageSize
????????{
????????????get
????????????{
????????????????return pageSize;
????????????}
????????????set
????????????{
????????????????pageSize = value;
????????????????PaginateData();
????????????}
????????}
????????public override bool IsPageCountValid
????????{
????????????get { return true; }
????????}
????????public override int PageCount
????????{
????????????get { return pageCount; }
????????}
????????public override IDocumentPaginatorSource?Source
????????{
????????????get { return null; }
????????}
????????#endregion

????????#region??構造函數相關方法
????????//構造函數
????????public DataPaginator(DataTable dt, Typeface typeface, int fontsize, double margin, Size pagesize)
????????{
????????????this.dataTable = dt;
????????????this.typeFace = typeface;
????????????this.fontSize = fontsize;
????????????this.margin = margin;
????????????this.pageSize = pagesize;
????????????PaginateData();
????????}
????????/// <summary>
????????/// 計算頁數pageCount
????????/// </summary>
????????private void PaginateData()
????????{
????????????//字符大小度量標準
????????????FormattedText ft = GetFormattedText("A");??//取"A"的大小計算行高等；
????????????//計算行數
????????????rowsPerPage = (int)((pageSize.Height - margin * 2) / ft.Height);
????????????//預留標題行
????????????rowsPerPage = rowsPerPage - 1;
????????????pageCount = (int)Math.Ceiling((double)dataTable.Rows.Count / rowsPerPage);
????????}
????????/// <summary>
????????/// 格式化字符
????????/// </summary>
????????private FormattedText GetFormattedText(string text)
????????{
????????????return GetFormattedText(text, typeFace);
????????}
????????/// <summary>
????????/// 按指定樣式格式化字符
????????/// </summary>
????????private FormattedText GetFormattedText(string text, Typeface typeFace)
????????{
????????????return new FormattedText(text, CultureInfo.CurrentCulture, FlowDirection.LeftToRight, typeFace, fontSize, Brushes.Black);
????????}
????????/// <summary>
????????/// 獲取對應頁面數據并進行相應的打印設置
????????/// </summary>
????????public override DocumentPage GetPage(int pageNumber)
????????{
????????????//設置列寬
????????????FormattedText ft = GetFormattedText("A");
????????????List<double> columns = new List<double>();
????????????int rowCount = dataTable.Rows.Count;
????????????int colCount = dataTable.Columns.Count;
????????????double columnWith = margin;
????????????columns.Add(columnWith);
????????????for (int i = 1; i < colCount; i++)
????????????{
????????????????columnWith += ft.Width * 15;
????????????????columns.Add(columnWith);
????????????}
????????????//獲取頁面對應行數
????????????int minRow = pageNumber * rowsPerPage;
????????????int maxRow = minRow + rowsPerPage;
????????????//繪制打印內容
????????????DrawingVisual visual = new DrawingVisual();
????????????Point point = new Point(margin, margin);
????????????using (DrawingContext dc = visual.RenderOpen())
????????????{
????????????????Typeface columnHeaderTypeface = new Typeface(typeFace.FontFamily, FontStyles.Normal, FontWeights.Bold, FontStretches.Normal);
????????????????//獲取表頭
????????????????for (int i = 0; i < colCount; i++)
????????????????{
????????????????????point.X = columns[i];
????????????????????ft = GetFormattedText(dataTable.Columns[i].Caption, columnHeaderTypeface);
????????????????????dc.DrawText(ft, point);
????????????????}
????????????????dc.DrawLine(new Pen(Brushes.Black,3), new Point(margin, margin + ft.Height), new Point(pageSize.Width - margin, margin + ft.Height));
????????????????point.Y += ft.Height;
????????????????//獲取表數據
????????????????for (int i = minRow; i < maxRow; i++)
????????????????{
????????????????????if (i > (rowCount - 1)) break;
????????????????????for (int j = 0; j < colCount; j++)
????????????????????{
????????????????????????point.X = columns[j];
????????????????????????string colName = dataTable.Columns[j].ColumnName;
????????????????????????ft = GetFormattedText(dataTable.Rows[i][colName].ToString());
????????????????????????dc.DrawText(ft, point);
????????????????????}
????????????????????point.Y += ft.Height;
????????????????}
????????????}
????????????return new DocumentPage(visual);
????????}
????????#endregion
????}