C#列印相關的知識點

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       GDI+可以用來建立和處理映像，還可以“繪製文本”。人們通常認為，文本時列印出來的，不是繪製出來的，但是在.NET中，顯示和渲染文本的技術類似於顯示圖形的技術：必須建立Graphics對象，然後利用該對象的方法來定位和渲染文本字串。所以，字型（Font）是列印的基礎知識，有關字型的知識請參閱MSDN  http://msdn.microsoft.com/zh-cn/library/system.drawing.font(v=vs.110).aspx 。

       System.Drawing.Printing命名空間的PrintDocument類提供了控制列印進程的方法、成員屬性和事件，因此，要建立輸出到印表機的程式，就首先要建立PrintDocument對象。

       PrintDocument pDocument = new PrintDocument();

然後調用PrintDocument.Print方法啟動列印進程，此時觸發PrintDocument類的BeginPrint和PrintPage事件，PrintPage事件處理方法包含產生輸出的邏輯和語句，包括確定列印行數、輸出DrawString語句、負責通知底層的列印控制器是否還有待列印的頁面（設定HasMorePages屬性）等。觸發流程如下：

private void FrmMain_Load(object sender, EventArgs e){sr = new StreamReader(@"資料的路徑(.txt)");//資料格式如下/*1000758,1050,SKJALDHAHDLKJAH,125.4701000758,1050,SKJALDHAHDLKJAH,125.4701000758,1050,SKJALDHAHDLKJAH,125.4701000758,1050,SKJALDHAHDLKJAH,125.4701000758,1050,SKJALDHAHDLKJAH,125.4701000758,1050,SKJALDHAHDLKJAH,125.4701000758,1050,SKJALDHAHDLKJAH,125.4701000758,1050,SKJALDHAHDLKJAH,125.4701000758,1050,SKJALDHAHDLKJAH,125.4701000758,1050,SKJALDHAHDLKJAH,125.470*/}

載入資料

1         StreamReader sr;2         string[] prtLine;3         Font rptFont;4         Font hdrFont;5         string title = "Title";6         float lineHeight;

類層級的變數

  private void pDocument_BeginPrint(object sender, PrintEventArgs e)        {            rptFont = new Font("Arial", 10);            hdrFont = new Font(rptFont, FontStyle.Bold);        }

BeginPrint事件，一般用於初始化字型等變數

 private void pDocument_EndPrint(object sender, PrintEventArgs e)        {           rptFont.Dispose();           hdrFont.Dispose();           sr.Close();        }

EndPrint事件，一般用於釋放資源，關閉資料連線等

 private void pDocument_PrintPage(object sender, PrintPageEventArgs e)        {            Graphics graphics = e.Graphics;            int xPos = e.MarginBounds.Left;            int lineCt = 0;            lineHeight = hdrFont.GetHeight(graphics);            int linesPerPage = (int)((e.MarginBounds.Bottom - e.MarginBounds.Top) / lineHeight - 2);            float yPos = 2 * lineHeight + e.MarginBounds.Top;            int hdrPos = e.MarginBounds.Top;            PrintHdr(graphics, hdrPos, 200);            string prod;            char[] delim = { ‘,‘ };            while ((prod = sr.ReadLine()) != null)            {                prtLine = prod.Split(delim, 4);                yPos += lineHeight;                PrintDetail(graphics, yPos);                if (lineCt == linesPerPage)                {                    e.HasMorePages = true;                    lineCt = 0;                    break;                }                lineCt++;            }        }

PrintPages事件，包括主要的列印邏輯以及HasMorePages屬性的設定

 private void PrintHdr(Graphics g, int yPos, int xPos)        {            g.DrawString(title, hdrFont, Brushes.Black, xPos, yPos);            float[] ts = { 80, 80, 200 };            StringFormat strFmt = new StringFormat();            strFmt.SetTabStops(0, ts);            g.DrawString("Code\tVender\tDescription\tCost", hdrFont, Brushes.Black, xPos, yPos + 2 * lineHeight, strFmt);        }

列印大標題和欄位標題

 private void PrintDetail(Graphics g, float yPos)        {            int xPos = 200;            StringFormat strFmt = new StringFormat();            strFmt.Trimming = StringTrimming.EllipsisCharacter;            strFmt.FormatFlags = StringFormatFlags.NoWrap;            RectangleF r = new RectangleF(xPos + 160, yPos, 200, lineHeight);            string invenid = prtLine[0];            string vendor = prtLine[1];            string desc = prtLine[2];            Decimal price = decimal.Parse(prtLine[3]);            g.DrawString(invenid, rptFont, Brushes.Black, xPos, yPos);            g.DrawString(vendor, rptFont, Brushes.Black, xPos + 80, yPos);            g.DrawString(desc, rptFont, Brushes.Black, r, strFmt);            strFmt.Alignment = StringAlignment.Far;            strFmt.Trimming = StringTrimming.None;            g.DrawString(price.ToString("#,###.00"), rptFont, Brushes.Black, xPos + 400, yPos, strFmt);        }

列印詳細內容

 private void btnPrint_Click(object sender, EventArgs e)        {            PrintDocument pDocument = new PrintDocument();            PrintDialog pDialog = new PrintDialog();            pDialog.Document = pDocument;            pDialog.AllowSomePages = true;            PrintPreviewDialog preDialog = new PrintPreviewDialog();            preDialog.Document = pDocument;            pDocument.PrintPage += new PrintPageEventHandler(pDocument_PrintPage);            pDocument.BeginPrint += new PrintEventHandler(pDocument_BeginPrint);            pDocument.EndPrint += new PrintEventHandler(pDocument_EndPrint);            if (pDialog.ShowDialog() == DialogResult.OK)            {                pDocument.Print();            }        }

按鈕事件

 

C#列印相關的知識點