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最新推荐文章于 2024-09-26 14:05:02 发布

sasasa_sa

最新推荐文章于 2024-09-26 14:05:02 发布

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CC 4.0 BY-SA版权

文章标签： string exception null class file

本文链接：https://blog.youkuaiyun.com/zhoulihua214/article/details/2936225

using System;
using System.Collections.Generic;
using System.Text;
using System.Drawing;
using System.Drawing.Printing;
using System.IO;
using System.Windows.Forms;

namespace WindowsApplication6
{
    class CustomDocument:PrintDocument
    {
        private Font _printFont;
        private string _fileToPrint;
        private Single _headerHeight;
        private TextReader _printStream;
        public string FieldToPrint
        {
            get
            {
                return _fileToPrint;
            }
            set
            {
                if (File.Exists(value))
                {
                    _fileToPrint = value;
                }
                else
                    throw (new Exception("File not found."));
            }
        }
        public Font PrintFont
        {
            get
            {
                return _printFont;
            }
            set
            {
                _printFont=value;
            }
        }
        public Single HeaderHeight
        {
            get
            {
                return _headerHeight;
            }
            set
            {
                _headerHeight = value;
            }
        }
        protected virtual Single printPageHeader(RectangleF bounds,
            PrintPageEventArgs e)
        {
            Graphics g = e.Graphics;
            Font drawFont = new Font("Arial", 16, FontStyle.Bold);
            string headerText = this.DocumentName;
            RectangleF headerTextLayout = new RectangleF(bounds.X, bounds.Y, bounds.Width , bounds.Height);
            Single localHeaderHeight;
         StringFormat headerStringFormat = new StringFormat();
            headerStringFormat.Alignment = StringAlignment.Center;
            localHeaderHeight = g.MeasureString(headerText, drawFont, headerTextLayout.Size,headerStringFormat).Height;
            g.DrawString(headerText, drawFont, Brushes.Black, headerTextLayout, headerStringFormat);
            return localHeaderHeight;
        }
        protected override void OnBeginPrint(PrintEventArgs e)
        {
            base.OnBeginPrint(e);
            _printStream = new StreamReader(FieldToPrint);

        }
        protected override void OnEndPrint(PrintEventArgs e)
        {
            base.OnEndPrint(e);
            _printStream.Close();
        }

         protected override void OnPrintPage(PrintPageEventArgs e)
        {
            base.OnPrintPage(e);
            Graphics gdipage=e.Graphics ;
            Single leftMargin = e.MarginBounds.Left;
            Single topMargin = e.MarginBounds.Top;
            Single width = e.MarginBounds.Width;
            Single height = e.MarginBounds.Height;
            Single lineHeight = _printFont.GetHeight(gdipage);
            Single linePerpage = e.MarginBounds.Height;
            int lineCount = 0;
            string lineText = null;
            Single headerSize;
            Single currentPosition = topMargin;
            RectangleF headerBounds = new RectangleF(leftMargin, topMargin, width ,height);
            headerBounds.Height = this.HeaderHeight;
            headerSize = printPageHeader(headerBounds, e);
            currentPosition += (headerSize + 20);
            while (lineCount < linePerpage && ((lineText = _printStream.ReadLine()) != null))
            {
                gdipage.DrawString(lineText, _printFont, Brushes.Black, leftMargin, (currentPosition + (lineCount++ * lineHeight)));
            }
            if (lineText != null)
                e.HasMorePages = true;
            else
                e.HasMorePages=false;
        }

}