ListView中的数据打印(从百度大哥那里找了一个ListView类)

Question

using System;
using System.ComponentModel;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Printing;namespace Sdyy_Manager
{
    /// <summary>    
    /// ListView 的所见即所得的打印支持类。    
    /// </summary>    
    public partial class PrintListView : ListView
    {
        /// <summary>    
        /// 指示是否进行打印预览，默认值为 true    
        /// </summary>    
        private bool m_bIsPreview;        /// <summary>    
        /// 指示是否总是打印标题，默认值为 true    
        /// </summary>    
        private bool m_bIsAlwaysPrintHeader;        /// <summary>    
        /// 需要打印的页首字符串    
        /// </summary>    
        private string m_sPrintHeaderString;        /// <summary>    
        /// 页首字体    
        /// </summary>    
        private Font m_oHeaderFont;        /// <summary>    
        /// 正文字体    
        /// </summary>    
        private Font m_oBodyFont;        /// <summary>    
        /// 页尾字体    
        /// </summary>    
        private Font m_oTailFont;        /// <summary>    
        /// 正文部分的 ColumnHeader 字体，该字体为正文字体的加粗形式    
        /// </summary>    
        private Font m_oColumnHeaderFont;        /// <summary>    
        /// 打印文档    
        /// </summary>    
        private PrintDocument m_oPrintDoc;
        /// <summary>    
        /// 行间距    
        /// </summary>    
        private int m_nLineSpace;
        private int m_nPrintWidth;            // 打印区域宽度    
        private int m_nPrintHeight;            // 打印区域长度    
        private int m_nPageCount;            // 打印页数    
        private int m_nCurPrintPage;         // 当前正在打印的页码    
        private int m_nTotalPage;            // 共有的页数    
        private int m_nFromPage;            // 用户选择的打印起始页    
        private int m_nCurPrintItem;         // 当前正在打印的元素            private Rectangle m_oHeaderRect;      // 打印页首的区域    
        private Rectangle m_oBodyRect;         // 打印正文的区域    
        private Rectangle m_oTailRect;         // 打印页尾的区域            private Brush defaultBrush;
        private Pen defaultPen;        /// <summary>    
        /// 设置或获取是否进行打印预览    
        /// </summary>    
        public bool IsPreview
        {
            get { return m_bIsPreview; }
            set { m_bIsPreview = value; }
        }
        /// <summary>    
        /// 设置或获取是否总是打印标题    
        /// </summary>    
        public bool IsAlwaysPrintHeader
        {
            get { return m_bIsAlwaysPrintHeader; }
            set { m_bIsAlwaysPrintHeader = value; }
        }
        /// <summary>    
        /// 设置或获取打印的页首字符串    
        /// </summary>    
        public string PrintHeaderString
        {
            get { return m_sPrintHeaderString; }
            set { if (value != null) m_sPrintHeaderString = value; }
        }
        /// <summary>    
        /// 设置或获取页首字体    
        /// </summary>    
        public Font HeaderFont
        {
            set { m_oHeaderFont = value; }
            get { return m_oHeaderFont; }
        }
        /// <summary>    
        /// 设置或获取正文字体    
        /// 如果对正文字体的 Bold 属性设置为 true ，则发生 Exception 类型的异常    
        /// </summary>    
        public Font BodyFont
        {
            set
            {
                if (value == null)
                    return;
                if (value.Bold == true)
                {
                    throw new Exception("正文字体不能进行 [加粗] 设置.");
                }
                else
                {
                    m_oBodyFont = value;
                }
            }
            get { return m_oBodyFont; }
        }
        /// <summary>    
        /// 设置或获取页尾字体    
        /// </summary>    
        public Font TailFont
        {
            set { m_oTailFont = value; }
            get { return m_oTailFont; }
        }
直接调用DoPrint  出现异常`没有要打印的数据 也就是空的``但是里面有数据
这不是重载了listView了嘛 写好这个类`然后加上去不就行了吗？

Answer 1

 /// <summary>    
        /// 设置或获取行间距    
        /// </summary>    
        public int LineSpace
        {
            get { return m_nLineSpace; }
            set
            {
                if (value < 0)
                {
                    m_nLineSpace = 0;
                }
                m_nLineSpace = value;
            }
        }
        /// <summary>    
        /// 构造函数，设置打印信息的一些默认值    
        /// </summary>    
        public PrintListView()
        {
            m_bIsPreview = true;
            m_bIsAlwaysPrintHeader = true;
            m_sPrintHeaderString = "";
            m_oHeaderFont = null;
            m_oTailFont = null;
            m_oBodyFont = null;
            m_oColumnHeaderFont = null;
            m_oPrintDoc = null;            m_nPrintWidth = 0;
            m_nPrintHeight = 0;
            m_nPageCount = 0;
            m_nCurPrintPage = 1;
            m_nFromPage = 1;
            m_nLineSpace = 0;
            m_nCurPrintItem = 0;            defaultBrush = Brushes.Black;
            defaultPen = new Pen(defaultBrush, 1);
        }
        /// <summary>    
        /// 初始化打印文档的属性    
        /// </summary>    
        /// <returns></returns>    
        private void InitPrintDocument()
        {
            m_oPrintDoc = new PrintDocument();
            m_oPrintDoc.DocumentName = m_sPrintHeaderString;
            if (m_oPrintDoc.PrinterSettings.PrinterName == "<no default printer>")
            {
                throw new Exception("未找到默认打印机.");
            }
            else
            {
                m_oPrintDoc.PrintPage += new PrintPageEventHandler(PrintPage);
                m_oPrintDoc.BeginPrint += new PrintEventHandler(BeginPrint);
                m_oPrintDoc.EndPrint += new PrintEventHandler(EndPrint);
            }
            /* 设置打印字体 */
            if (m_oHeaderFont == null)
            {
                m_oHeaderFont = new Font("楷体_GB2312", 16, FontStyle.Bold, GraphicsUnit.World);
            }            if (m_oBodyFont == null)
            {
                m_oBodyFont = new Font("楷体_GB2312", 14, FontStyle.Regular, GraphicsUnit.World);
            }            m_oColumnHeaderFont = new Font(m_oBodyFont, FontStyle.Bold);            if (m_oTailFont == null)
            {
                m_oTailFont = new Font("楷体_GB2312", 12, FontStyle.Regular, GraphicsUnit.World);
            }
        }
        /// <summary>    
        /// 初始化打印纸张设置    
        /// </summary>    
        private bool InitPrintPage(out Margins margins)
        {
            margins = null;            /* 获取当前 listview 的分辨率 */
            Graphics g = this.CreateGraphics();
            float x = g.DpiX;
            g.Dispose();            /* 显示纸张设置对话框 */
            PageSetupDialog ps = new PageSetupDialog();
            ps.Document = m_oPrintDoc;
            if (ps.ShowDialog() == DialogResult.Cancel)
            {
                return false;
            }
            else
            {               // 根据用户设置的纸张信息计算打印区域，计算结果的单位为 1/100 Inch    
                m_nPrintWidth = ps.PageSettings.Bounds.Width - ps.PageSettings.Margins.Left - ps.PageSettings.Margins.Right;
                m_nPrintHeight = ps.PageSettings.Bounds.Height - ps.PageSettings.Margins.Top - ps.PageSettings.Margins.Bottom;
                margins = ps.PageSettings.Margins;
            }
            if (m_nPrintWidth <= 0 || m_nPrintHeight <= 0)
            {
                throw new Exception("纸张设置错误.");
            }            /* 将当前 listview 的各column的长度和转换为英寸，判断打印范围是否越界 */
            int listViewWidth = 0;
            for (int i = 0; i < this.Columns.Count; i++)
            {
                listViewWidth += this.Columns[i].Width;
            }
            if (Convert.ToInt32(listViewWidth / x * 100) > m_nPrintWidth)
            {
                //throw new Exception("打印内容超出纸张范围 ！\r\n请尝试调整纸张或纸张边距；\r\n或缩小表格各列的宽度。");   
            }
            m_oPrintDoc.DefaultPageSettings = ps.PageSettings;
            return true;
        }
        /// <summary>    
        /// 初始化打印页码设置    
        /// </summary>    
        private bool InitPrintPageNumber(Margins margins)
        {            /* 计算页数 */
            int headerFontHeight = m_oHeaderFont.Height;
            int columnHeaderFontHeight = m_oColumnHeaderFont.Height;
            int bodyFontHeight = m_oBodyFont.Height;
            int tailFontHeight = m_oTailFont.Height;            // 页首区域打印 页首字符串 以及一条横线    
            m_oHeaderRect = new Rectangle(margins.Left, margins.Top, m_nPrintWidth, headerFontHeight + m_nLineSpace + 3);            int tailHeight = tailFontHeight + m_nLineSpace + 3;
            // 页尾区域打印 一条横线，页码和打印时间（在同一行）    
            m_oTailRect = new Rectangle(margins.Left, margins.Top + m_nPrintHeight - tailHeight, m_nPrintWidth, tailHeight);            //正文区域为去掉页首和页尾区域的部分    
            m_oBodyRect = new Rectangle(margins.Left, m_oHeaderRect.Bottom + 2, m_nPrintWidth, m_oTailRect.Top - m_oHeaderRect.Bottom - 4);            /* 计算第一页能打印的元素个数 */
            int printItemPerPage = 0;
            int firstPageItem = Convert.ToInt32((m_oBodyRect.Height - columnHeaderFontHeight - m_nLineSpace) / (bodyFontHeight + m_nLineSpace));
            if (firstPageItem >= this.Items.Count)
            {   // 需打印的元素只有一页    
                m_nPageCount = 1;
            }
            else
            {                              // 需要打印的元素有多页    
                printItemPerPage = firstPageItem;
                int leftItems = this.Items.Count - firstPageItem;
                if (m_bIsAlwaysPrintHeader == false)
                {
                    printItemPerPage = (m_oBodyRect.Height + m_oHeaderRect.Height + 2 - columnHeaderFontHeight - m_nLineSpace) / (bodyFontHeight + m_nLineSpace);
                }
                if (leftItems % printItemPerPage == 0)
                {
                    m_nPageCount = leftItems / printItemPerPage + 1;
                }
                else
                {
                    m_nPageCount = leftItems / printItemPerPage + 2;
                }
            }
            m_nTotalPage = m_nPageCount;
            /* 显示打印对话框 */
            PrintDialog pd = new PrintDialog();
            pd.Document = m_oPrintDoc;
            pd.PrinterSettings.MinimumPage = 1;
            pd.PrinterSettings.MaximumPage = m_nPageCount;
            pd.PrinterSettings.FromPage = 1;
            pd.PrinterSettings.ToPage = m_nPageCount;            pd.AllowPrintToFile = false;      // 不设置打印到文件    
            if (m_nPageCount > 1)
            {
                pd.AllowSelection = true;
            }
            else
            {
                pd.AllowSelection = false;
            }
            pd.AllowSomePages = true;
            if (pd.ShowDialog() == DialogResult.OK)
            {
                m_nPageCount = pd.PrinterSettings.ToPage - pd.PrinterSettings.FromPage + 1;                if (pd.PrinterSettings.FromPage > 1)
                {
                    m_nCurPrintItem = firstPageItem + (pd.PrinterSettings.FromPage - 2) * printItemPerPage;
                }
                else
                {
                    m_nCurPrintItem = 0;
                }
                m_nFromPage = pd.PrinterSettings.FromPage;
                m_oPrintDoc.DocumentName = m_nPageCount.ToString();
                m_oPrintDoc.PrinterSettings = pd.PrinterSettings;
                return true;
            }
            else
            {
                return false;
            }
        }
        /// <summary>    
        /// 启动 ListView 的打印工作    
        /// </summary>    
        public virtual void DoPrint()
        {
            if (this.Items.Count <= 0)
            {
                throw new Exception("没有需要打印的元素.");
            }
            InitPrintDocument();            Margins margins = null;
            if (InitPrintPage(out margins) == false)
                return;            if (InitPrintPageNumber(margins) == false)
                return;            if (m_bIsPreview == false)
            {
                m_oPrintDoc.Print();
            }
            else
            {
                PrintPreviewDialog pd = new PrintPreviewDialog();
                pd.Document = m_oPrintDoc;
                pd.PrintPreviewControl.Zoom = 1.0;
                pd.WindowState = FormWindowState.Maximized;
                pd.ShowInTaskbar = true;
                pd.ShowDialog();
            }
        }

Answer 2

只能打印listview表头,不能打印listview中的数据,打印预览正常,但是实际打印只有表头.