C# GDI 绘图打印

用了很久的水晶报表，最近经常遇到客户电脑上无法安装水晶报表，只能重装系统解决。决定用最原始的 GDI 绘图来打印报表。

using MySql.Data.MySqlClient;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Printing;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            MyDocument d = new MyDocument();
            //d.DefaultPageSettings.PrinterSettings.PrinterName = "GP-L80160 Series";//设置打印机
            //Console.WriteLine(d.DefaultPageSettings.PrintableArea.Width);//可以获得打印机的默认纸张宽度
            //d.DefaultPageSettings.Landscape = true; 横向纵向控制
            d.DefaultPageSettings.PaperSize = GetSize("MyPaper", 100, 500);
            if (true)
            {
                d.Preview();//调用扩展方法
            }
            else
            {
                d.Print();
            }
            Console.ReadLine();
        }

        //宽高为毫米
        static PaperSize GetSize(string name, float width, float height)
        {
            float mul = 3.937f;//GDI 打印尺寸为百分之一英寸，需要对毫米进行转换
            return new PaperSize(name, (int)Math.Floor(width * mul), (int)Math.Floor(height * mul));
        }
    }

    public class MyDocument : PrintDocument
    {
        //与 Print_PrintPage 相关的变量需要在 MyDocument_BeginPrint 中初始化。
        //仅在构造函数中初始化是不够的。在反复调用 PrintDocument 的 Print 方法时 pageIndex 的值会出错。
        int pageIndex;
        public MyDocument()
        {
            this.BeginPrint += MyDocument_BeginPrint;
            this.PrintPage += Print_PrintPage;
        }

        private void MyDocument_BeginPrint(object sender, PrintEventArgs e)
        {
            pageIndex = 0;
        }

        private void Print_PrintPage(object sender, PrintPageEventArgs e)
        {
            string text = "abcdefghijklmn";
            Font f = new Font("宋体", 10);
            StringFormat sf = new StringFormat()
            {
                Alignment = StringAlignment.Center,
                LineAlignment = StringAlignment.Center,
                FormatFlags = StringFormatFlags.NoWrap
            };
            //测量字符串，可以指定宽度和是否换行, 默认是允许换行的
            SizeF size = e.Graphics.MeasureString(text, f, 100, sf);
            float x, y;
            x = y = 10;
            //在实际绘制文本时使用的文本，字体等样式必须与测量时一致，并使用测量得到的尺寸
            e.Graphics.DrawString(text, f, Brushes.Black, new RectangleF(x, y, size.Width, size.Height), sf);
            //绘制线条
            e.Graphics.DrawLine(Pens.Black, 0, 0, 200, 200);
            if (pageIndex == 0)
            {
                pageIndex++;
                e.HasMorePages = true;
            }
        }
    }

    public static class PrintDocumentExtension
    {
        public static void Preview(this PrintDocument document)
        {
            PrintPreviewDialog ppd = new PrintPreviewDialog();
            ppd.Document = document;
            (ppd as Form).WindowState = FormWindowState.Maximized;
            ppd.ShowDialog();
        }
    }
}