C#按物理尺寸打印图片 e.Graphics.DrawImage(image,0,0)； //按物理尺寸打印

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

namespace SYS_TEST.BaseClass
{

    /// <summary>
    /// 图片直接打印方法
    /// </summary>
    public class PrintDirectClass
    {
        public const int PRINT_INIT = 0;
        public const int PRINT_FINISH= 1;
        public const int PRINT_CANCE = 2;
        public const int PRINT_ERROR = 3;
        public const int PRINTING = 4;
        public int result = PRINT_INIT; //打印结果

        private int printNum = 0;//多页打印
        public Image image = null;
        public string imageFile = "";//单个图片文件
        //private ArrayList fileList = new ArrayList();//多个图片文件
        public PrintDirectClass(Image image)
        {
            this.image = image;
            PrintPreview();
        }
        public PrintDirectClass(string imageFile)
        {
            this.imageFile = imageFile;
            PrintPreview();
        }
        public void PrintPreview()
        {
            PrintDocument docToPrint = new PrintDocument();
            docToPrint.BeginPrint += new System.Drawing.Printing.PrintEventHandler(this.docToPrint_BeginPrint);
            docToPrint.EndPrint += new System.Drawing.Printing.PrintEventHandler(this.docToPrint_EndPrint);
            docToPrint.PrintPage += new System.Drawing.Printing.PrintPageEventHandler(this.docToPrint_PrintPage);
            docToPrint.DefaultPageSettings.Landscape = false;
  

            PrintDialog printDialog = new PrintDialog();
            printDialog.AllowSomePages = true;
            printDialog.ShowHelp = true;
            printDialog.Document = docToPrint;
            //if (printDialog.ShowDialog() == DialogResult.OK)
            //{
                docToPrint.Print();
            //}
            //else
            //{
            //    result=PRINT_CANCE;
            //}

        }
        private void docToPrint_BeginPrint(object sender, System.Drawing.Printing.PrintEventArgs e)
        {
            result=PRINTING;
            //if (fileList.Count == 0)
            //    fileList.Add(imageFile);
        }
        private void docToPrint_EndPrint(object sender, System.Drawing.Printing.PrintEventArgs e)
        {
            result=PRINT_FINISH;
        }
        private void docToPrint_PrintPage(object sender, System.Drawing.Printing.PrintPageEventArgs e)
        {
            try
            {         
                //图片抗锯齿
                //e.Graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;

                if (this.image == null)
                {
                    //Stream fs = new FileStream(fileList[i].Trim(), FileMode.Open, FileAccess.Read);
                    Stream fs = new FileStream(imageFile.Trim(), FileMode.Open, FileAccess.Read);
                    System.Drawing.Image image = System.Drawing.Image.FromStream(fs);
                }
          
                //int x = e.MarginBounds.X;
                //int y = e.MarginBounds.Y;
                e.Graphics.DrawImage(image,0,0); //按物理尺寸打印
                //int width = image.Width;
                //int height = image.Height;
                if ((width / e.MarginBounds.Width) > (height / e.MarginBounds.Height))
                {
                    width = e.MarginBounds.Width;
                    height = image.Height * e.MarginBounds.Width / image.Width;
                }
                else
                {
                    height = e.MarginBounds.Height;
                    width = image.Width * e.MarginBounds.Height / image.Height;
                }

                DrawImage参数根据打印机和图片大小自行调整
                //System.Drawing.Rectangle destRect = new System.Drawing.Rectangle(x, y, width, height);
                //e.Graphics.DrawImage(image, destRect, 0, 0, image.Width, image.Height, System.Drawing.GraphicsUnit.Point);
                //System.Drawing.Rectangle destRect = new System.Drawing.Rectangle(x, y, width, height);
                //System.Drawing.Rectangle destRect = new System.Drawing.Rectangle(0, 0, width, height);
                //if (image.Height < 310)
                //{
                //    e.Graphics.DrawImage(image, 0, 30, image.Width + 20, image.Height);
                //    //    System.Drawing.Rectangle destRect1 = new System.Drawing.Rectangle(0, 30, image.Width, image.Height);
                //    //    e.Graphics.DrawImage(image, destRect1, 0, 0, image.Width, image.Height, System.Drawing.GraphicsUnit.Pixel);
                //}
                //else
                //{
                //    e.Graphics.DrawImage(image, 0, 0, image.Width + 20, image.Height);
                //    //    System.Drawing.Rectangle destRect2 = new System.Drawing.Rectangle(0, 0, image.Width, image.Height);
                //    //    e.Graphics.DrawImage(image, destRect2, 0, 0, image.Width, image.Height, System.Drawing.GraphicsUnit.Pixel);
                //}

                //if (printNum < fileList.Count - 1)
                //{
                //    printNum++;
                //    e.HasMorePages = true;//HasMorePages为true则再次运行PrintPage事件
                //    return;
                //}
                e.HasMorePages = false;
            }
            catch (Exception ex) {
                result = PRINT_ERROR;
            }
        }
    }
}

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