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把 O2S.Components.PDFRender4NET.dll添加到引用中（下载地址：https://www.so.com/s?q=O2S.Components.PDFRender4NET.dll&src=se_zoned）

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using System;

using System.Collections.Generic;

using System.Linq;

using System.Windows.Forms;

using O2S.Components.PDFRender4NET;

using System.Drawing;

using System.Drawing.Imaging;

using System.IO;

namespace O2S.Components.PDFRender4NET.pdf2image

{

public static class Program

{

public enum Definition

{

One = 1, Two = 2, Three = 3,

Four = 4, Five = 5, Six = 6,

Seven = 7, Eight = 8,

Nine = 9, Ten = 10

}

/// <summary>

/// 将PDF文档转换为图片的方法

/// </summary>

/// <param name="pdfInputPath">PDF文件路径</param>

/// <param name="imageOutputPath">图片输出路径</param>

/// <param name="imageName">生成图片的名字</param>

/// <param name="startPageNum">从PDF文档的第几页开始转换</param>

/// <param name="endPageNum">从PDF文档的第几页开始停止转换</param>

/// <param name="imageFormat">设置所需图片格式</param>

/// <param name="definition">设置图片的清晰度，数字越大越清晰</param>

public static void ConvertPDF2Image(string pdfInputPath, string imageOutputPath,

string imageName, int startPageNum, int endPageNum, ImageFormat imageFormat, Definition definition)

{

PDFFile pdfFile = PDFFile.Open(pdfInputPath);

if (!Directory.Exists(imageOutputPath))

{

Directory.CreateDirectory(imageOutputPath);

}

// validate pageNum

if (startPageNum <= 0)

{

startPageNum = 1;

}

if (endPageNum > pdfFile.PageCount)

{

endPageNum = pdfFile.PageCount;

}

if (startPageNum > endPageNum)

{

int tempPageNum = startPageNum;

startPageNum = endPageNum;

endPageNum = startPageNum;

}

// start to convert each page

for (int i = startPageNum; i <= endPageNum; i++)

{

Bitmap pageImage = pdfFile.GetPageImage(i - 1, 56 * (int)definition);

pageImage.Save(imageOutputPath + imageName + i.ToString() + "." + imageFormat.ToString(), imageFormat);

pageImage.Dispose();

}

pdfFile.Dispose();

}

public static void Main(string[] args)

{

ConvertPDF2Image("F:\\Events.pdf", "F:\\", "A", 1, 5, ImageFormat.Jpeg, Definition.One);

}

}

}