c# pdf转图片
/ <param name="imageFormat">设置所需图片格式</param>
/// <param name="resolution">设置图片的分辨率,数字越大越清晰,默认值为1</param>
public static void ConvertPDF2Image(string pdfInputPath, string imageOutputPath, string imageName, int startPageNum, int endPageNum, ImageFormat ima