C#中进行文本打印的功能

来源：互联网发布：淘宝购物最便宜的软件编辑：程序博客网时间：2024/05/22 09:27

问题描述：

一个记事本程序，要求能按标准打印其中的文档，包括在每行文字数目上进行控制等、

解决方法：

一、搞清楚打印的过程：

1、定义PrintDocument类，并且声明其PrintPage事件。

private void PrintDocument()
{
printDocument = new PrintDocument();
printDocument.PrintPage += new PrintPageEventHandler(printDocument_PrintPage);
}

2、实现PrintPage事件（关键）：

/**//// <summary>
/// 用来处理打印过程的核心事件。
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
/// <remarks></remarks>
void printDocument_PrintPage(object sender, PrintPageEventArgs e)
{
//StringReader lineReader = new StringReader(textBox.Text);
Graphics graphic = e.Graphics;//获取绘图对象
float linesPerPage = 0;//页面行号
float yPosition = 0;//绘制字符串的纵向位置
float leftMargin = e.MarginBounds.Left;//左边距
float topMargin = e.MarginBounds.Top;//上边距
string line = string.Empty;//读取的行字符串
int currentPageLine=0;//当前页读取的行数
Font charFont = richTextBox1.Font;//获取打印字体
SolidBrush brush = new SolidBrush(Color.Black);//刷子
linesPerPage = e.MarginBounds.Height / charFont.GetHeight(graphic);//每页可打印的行数
//countNum记录全局行数，currentPageLine记录当前打印页行数。
while (countNum < richTextBox1.Lines.Length)
{
if (currentPageLine < linesPerPage)
{
line = richTextBox1.Lines[countNum].ToString();
if (line.Length <= 50)
{
yPosition = topMargin + (currentPageLine * charFont.GetHeight(graphic));
//绘制当前行
graphic.DrawString(line, charFont, brush, leftMargin, yPosition, new StringFormat());
countNum++;
currentPageLine++;
}
else
{
//拆分后的行数
int moreLine = line.Length / 50 + 1;
string tempLine;
for (int i = 0; i < moreLine; i++)
{
//获得当前行的子串
if ((line.Length - i * 50) >= 50)
{
tempLine = line.Substring(i * 50, 50);
}
else
{
tempLine = line.Substring(i * 50, line.Length - i * 50);
}
yPosition = topMargin + (currentPageLine * charFont.GetHeight(graphic));
//绘制当前行
graphic.DrawString(tempLine, charFont, brush, leftMargin, yPosition, new StringFormat());
//当前打印页行数加1
currentPageLine++;
}
//总行数加1
countNum++;
}
}
else
{
line = null;
break;
}
}
//一页显示不完时自动重新调用此方法
if (line == null)
{
e.HasMorePages = true;
}
else
{
e.HasMorePages = false;
}
//每次打印完后countNum清0;
if (countNum >= richTextBox1.Lines.Length)
{
countNum = 0;
}
}

3、使用 printDocument.Print()进行打印

private void 打印PToolStripButton_Click(object sender, EventArgs e)
{
// tsmSave_Click(sender, e);
//初始化PrintDocument()
this.PrintDocument();
PrintDialog print = new PrintDialog();
//将初始化后的printDocument赋给print.Document
print.Document = printDocument;
try
{
if (print.ShowDialog() == DialogResult.OK)
{
//打印时直接调用PrintDocument的Print方法
printDocument.Print();
}
}
catch (Exception ex)
{
MessageBox.Show("打印出错:" + ex.ToString());
//出错则结束打印过程
printDocument.PrintController.OnEndPrint(printDocument, new PrintEventArgs());
}
}

4、定义打印预览（可选） \、、、、、、、
        private void 打印预览VToolStripMenuItem_Click(object sender, EventArgs e)
        {
            PrintPreviewDialog printPreview = new PrintPreviewDialog();
            //初始化PrintDocument
            this.PrintDocument();
            //将初始化后的printDocument赋给print.Document
            printPreview.Document = printDocument;
            try
            {
                printPreview.ShowDialog();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }