1.需要添加引用  O2S.Components.PDFRender4NET

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实例代码：

/// <summary>
/// 将PDF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 PdfToPng(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
if(endPageNum == 1)
{
Bitmap pageImage = pdfFile.GetPageImage(1 – 1, 56 * (int)definition);
pageImage.Save(imageOutputPath + imageName + “.” + imageFormat.ToString(), imageFormat);
pageImage.Dispose();
}
else
{
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();
}