网上一个关于支持打印的ListView类代码的一点改动

在该程序中，因为每次在预览后的打印是要重新填充那块“画布”的，

所以在private void EndPrint(object sender, PrintEventArgs e)处理中要重新初始化一些变量

整体代码如下（只对支持预览的改动，其他若有问题，请高手指点）

/* -----------------------------------------------------------------------------------------
* 【文件名】： PrintListView.cs
* 【说 明】： 支持 ListView 的所见即所得的打印的类
* 1、整个打印的部分分为页首、正文、页尾三个部分；
* 2、正文部分打印 ListView 的 ColumnHeader 以及 ListView 的 Items，通过 PrintPageBody() 实现；
* 3、页首、页尾的打印自由定制，默认的行为是页首打印标题，页尾打印页码和时间，需要改变页首和
* 页尾的默认打印方式，可以对 PrintPageHeader() 和 PrintPageTail() 函数进行重写，并进行打印区域
* 的重新计算；
* 4、支持预览
* 5、支持打印设置，如：是否每页都打印标题，设置页首、正文、页尾的打印字体，等。
*
* 【作 者】： sashow ( sashow @ 163.com )
* 【日 期】： 2005.05.10
* ----------------------------------------------------------------------------------------*/

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Drawing.Printing;

namespace ForCustoms
{
/// <summary>
/// ListView 的所见即所得的打印支持类。
/// </summary>
public 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_nFromPageSave;

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;

int listViewWidth;

/// <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; }
}

/// <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", 24, FontStyle.Bold, GraphicsUnit.World);
}

if (m_oBodyFont == null)
{
m_oBodyFont = new Font("楷体_GB2312", 18, 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 */
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_nPrintWidth - listViewWidth) / 2, 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_nFromPageSave = m_nFromPage;
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();
}
}

/// <summary>
/// 打印页首
/// </summary>
/// <param name="g"></param>
protected virtual void PrintPageHeader(Graphics g)
{
RectangleF textRect = new RectangleF(m_oHeaderRect.X, m_oHeaderRect.Y, m_oHeaderRect.Width, m_oHeaderRect.Height - 3);
CenterText(g, m_sPrintHeaderString, m_oHeaderFont, defaultBrush, textRect);
g.DrawLine(defaultPen, m_oHeaderRect.X, m_oHeaderRect.Bottom - 2, m_oHeaderRect.Right, m_oHeaderRect.Bottom - 2);
}

/// <summary>
/// 打印正文
/// </summary>
/// <param name="g"></param>
protected virtual void PrintPageBody(Graphics g)
{
Rectangle textRect = m_oBodyRect;
if (m_bIsAlwaysPrintHeader == false && m_nCurPrintPage != 1)
{
textRect = new Rectangle(m_oHeaderRect.X, m_oHeaderRect.Y, m_oHeaderRect.Width, m_oHeaderRect.Height + 2 + m_oBodyRect.Height);
}

/* 打印标题,也就是 columnHeader */
int columnHeaderFontHeight = m_oColumnHeaderFont.Height;
int bodyFontHeight = m_oBodyFont.Height;
Rectangle columnHeaderRect = new Rectangle(textRect.X, textRect.Y, textRect.Width, columnHeaderFontHeight + m_nLineSpace);
PrintColumnHeader(g, m_oColumnHeaderFont, defaultBrush, columnHeaderRect);

/* 打印元素 */
int itemHeight = bodyFontHeight + m_nLineSpace;
Rectangle itemRect;
int yPos = columnHeaderRect.Bottom;
int printItemPerPage = (textRect.Height - columnHeaderRect.Height) / (bodyFontHeight + m_nLineSpace);

for (int i = 0; (i < printItemPerPage) && (m_nCurPrintItem < this.Items.Count); i++)
{
itemRect = new Rectangle(textRect.X, yPos, textRect.Width, itemHeight);
PrintItem(g, m_oBodyFont, defaultBrush, itemRect);
m_nCurPrintItem++;
yPos += itemHeight;
}
}

/// <summary>
/// 打印页尾
/// </summary>
/// <param name="g"></param>
protected virtual void PrintPageTail(Graphics g)
{
g.DrawLine(defaultPen, m_oTailRect.X, m_oTailRect.Top + 1, m_oTailRect.Right, m_oTailRect.Top + 1);

RectangleF textRect = new RectangleF(m_oTailRect.X, m_oTailRect.Y + 3, m_oTailRect.Width, m_oTailRect.Height - 3);
string text = "第 " + m_nFromPage.ToString() + " 页 共 " + m_nTotalPage.ToString() + " 页";
m_nFromPage++;
CenterText(g, text, m_oTailFont, defaultBrush, textRect);

string time = "打印时间：" + DateTime.Now.ToLongDateString() + " ";
RightText(g, time, m_oTailFont, defaultBrush, textRect);
}

/// <summary>
/// 打印一页
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void PrintPage(object sender, PrintPageEventArgs e)
{
e.Graphics.PageUnit = GraphicsUnit.Inch;
e.Graphics.PageScale = .01f;

if (m_bIsAlwaysPrintHeader == true)
{
PrintPageHeader(e.Graphics);
}
else
{
if (m_nCurPrintPage == 1)
{
PrintPageHeader(e.Graphics);
}
}

PrintPageBody(e.Graphics);
PrintPageTail(e.Graphics);

if (m_nCurPrintPage == m_nPageCount)
{
e.HasMorePages = false;
}
else
{
e.HasMorePages = true;
}
m_nCurPrintPage++;

}

/// <summary>
/// 打印前的初始化设置
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void BeginPrint(object sender, PrintEventArgs e)
{
m_nCurPrintPage = 1;
}

/// <summary>
/// 打印结束后的资源释放
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void EndPrint(object sender, PrintEventArgs e)
{
m_nCurPrintItem = 0;
m_nFromPage = m_nFromPageSave;
}

/// <summary>
/// 居中显示文本信息
/// </summary>
private void CenterText(Graphics g, string t, Font f, Brush b, RectangleF rect)
{
StringFormat sf = new StringFormat();
sf.Alignment = StringAlignment.Center;
sf.LineAlignment = StringAlignment.Center;
g.DrawString(t, f, b, rect, sf);
}

/// <summary>
/// 居右显示文本信息
/// </summary>
private void RightText(Graphics g, string t, Font f, Brush b, RectangleF rect)
{
StringFormat sf = new StringFormat();
sf.Alignment = StringAlignment.Far;
sf.LineAlignment = StringAlignment.Center;
g.DrawString(t, f, b, rect, sf);
}

/// <summary>
/// 居左显示文本信息
/// </summary>
private void LeftText(Graphics g, string t, Font f, Brush b, RectangleF rect)
{
StringFormat sf = new StringFormat();
sf.Alignment = StringAlignment.Near;
sf.LineAlignment = StringAlignment.Center;
g.DrawString(t, f, b, rect, sf);
}

/// <summary>
/// 打印 listview 的 columnheader
/// </summary>
private void PrintColumnHeader(Graphics g, Font f, Brush b, Rectangle rect)
{
StringFormat sf = new StringFormat();
sf.Alignment = StringAlignment.Center;
sf.LineAlignment = StringAlignment.Center;

Rectangle itemRect;
Point location = new Point(rect.Location.X, rect.Location.Y);
Size itemSize;

for (int i = 0; i < this.Columns.Count; i++)
{
itemSize = new Size(this.Columns[i].Width, rect.Height);
itemRect = new Rectangle(location, itemSize);

g.DrawRectangle(defaultPen, itemRect);
g.DrawString(this.Columns[i].Text, f, b, itemRect, sf);

location.X += this.Columns[i].Width;
}
}

/// <summary>
/// 打印 listview 的 item
/// </summary>
private void PrintItem(Graphics g, Font f, Brush b, Rectangle rect)
{
StringFormat sf = new StringFormat();
sf.Alignment = StringAlignment.Near;
sf.LineAlignment = StringAlignment.Center;

Rectangle itemRect;
Point location = new Point(rect.Location.X, rect.Location.Y);
Size itemSize;

for (int i = 0; i < this.Columns.Count; i++)
{
itemSize = new Size(this.Columns[i].Width, rect.Height);
itemRect = new Rectangle(location, itemSize);

g.DrawRectangle(defaultPen, itemRect);
g.DrawString(this.Items[m_nCurPrintItem].SubItems[i].Text, f, b, itemRect, sf);

location.X += this.Columns[i].Width;
}
}
}
}
最后感谢原著