wkhtmltopdf 生成pdf

   public class PdfHelper
    {

        static string RootPath
        {
            get
            {
                string AppPath = "";
                HttpContext HttpCurrent = HttpContext.Current;
                if (HttpCurrent != null)
                {
                    AppPath = HttpCurrent.Server.MapPath("~");
                }

                return AppPath.Trim(new char[]{'\'});
            }
        }

       
        public static void GetPdf(HttpResponseBase response,string pdfUrl)
        {
            string fileName = Guid.NewGuid().ToString("N") + ".pdf";
            string filePath = RootPath + "\pdfs\" + fileName;
            string exePath=RootPath + "\wkhtmltopdf\wkhtmltopdf.exe";
            string args=pdfUrl + " --zoom 1.25 "" + filePath+""";
          
          
            Process p =new Process();
            p.StartInfo.FileName = exePath;
            p.StartInfo.Arguments = args;
            p.StartInfo.UseShellExecute = false;
            p.StartInfo.RedirectStandardInput = true;
            p.StartInfo.RedirectStandardOutput = true;
            p.StartInfo.RedirectStandardError = true;
            p.StartInfo.CreateNoWindow = false;

            try
            {
                p.Start();
                p.WaitForExit();               
                p.StandardOutput.ReadToEnd();
                p.Close();

                FileStream fs = new FileStream(filePath, FileMode.Open);
                byte[] file = new byte[fs.Length];
                fs.Read(file, 0, file.Length);
                fs.Close();


                response.Clear();
                response.AddHeader("content-disposition", "attachment; filename=" + fileName);
                response.ContentType = "application/octet-stream";
                response.BinaryWrite(file);
                response.Flush();
                
            }
            catch
            {

            }
        
        }
    }

 对于要打印成pdf的html要求:

    1. dom元素的 height/width/margin/padding以及定位,尽量使用百分比的形式。

    2. 图片的像素质量尽量高一些，因为生成pdf的过程会有缩放。另外加入html的时候设置显示的高度跟宽度。

    3. 对于pdf的分页，可以直接使用一些属性来实现：

          <header page-break-before="always"></header>

         {page-break-before:always;}//添加到header的dom元素实现换页 

          <footer page-break-after="always"></footer>                                  
         {page-break-after:always;}  //添加到footer的dom元素实现换页

                                                    
         {page-break-inside:avoid;}