我正在使用Rotativa工具来显示PDF。它在localhost上工作正常，但在Azure平台上不起作用。
下面是我的代码...
public ActionResult GeneratePDF(int id = 0)
{
ReportTransactionData reporttransactiondata = db.ReportTransactionDatas.Find(id);
var viewFileToPrint = @"~/Views/ReportTranData/PDFReport.cshtml";
//var oRotativaPDF = new Rotativa.ViewAsPdf();
var oRotativaPDF = new Rotativa.PartialViewAsPdf();
try
{
if (reporttransactiondata == null)
{
return HttpNotFound();
}
else
{
// Populate reporttransactiondata with Verfier Name...TO BE IMPLEMENTED LATER...
//reporttransactiondata.VerifierName = GetVerifierNameByID(reporttransactiondata.VerifierID);
}
// Code to call a function/action...
//return new Rotativa.ActionAsPdf("PrintRptInPDF", reporttransactiondata)
//oRotativaPDF = new Rotativa.ViewAsPdf(viewFileToPrint, reporttransactiondata)
// {
// FileName = "Technician Job Report.pdf",
// PageSize = Size.A4,
// PageOrientation = Orientation.Portrait,
// PageMargins = new Margins(0, 0, 0, 0),
// PageWidth = 230, //250 //300 // 350
// PageHeight = 360, // 380 // 400 //420 // 450
// CustomSwitches = "--disable-smart-shrinking"
// };
oRotativaPDF = new Rotativa.PartialViewAsPdf(viewFileToPrint, reporttransactiondata)
{
FileName = "Technician Job Report.pdf",
PageSize = Size.A4,
PageOrientation = Orientation.Portrait,
PageMargins = new Margins(0, 0, 0, 0),
PageWidth = 230, //250 //300 // 350
PageHeight = 360, // 380 // 400 //420 // 450
CustomSwitches = "--disable-smart-shrinking"
};
}
catch (Exception ex)
{
// TODO: Code here...
}
return oRotativaPDF;
}
请忽略注释代码。这工作得很好，但是当我部署 Web 应用程序时，客户端不会下载 PDF 文件，并且一段时间后我的 IE 浏览器会显示 500 内部服务器错误。
我进一步探讨了这个问题，发现这个错误可能是因为 wkhtmltopdf.exe 没有在 Azure 平台上自行执行。因此，我在网上搜索有关问题解决方案的帮助下得出了以下解决方案......
公共(public) ActionResult 生成 PDF(int id = 0) { ReportTransactionData reporttransactiondata = db.ReportTransactionDatas.Find(id); 字符串 viewName = @"~/Views/ReportTranData/PDFReport.cshtml"; 字符串 wkhtmltopdfPath = Server.MapPath(@"~/Rotativa/"); 字符串开关 = string.Empty; 尝试 { if (报告交易数据 == null) { 返回 HttpNotFound(); }
string fullPath = Server.MapPath(@"~/ApplicationFiles/TechnicianJobReport.pdf");
FileInfo objFileInfo = new System.IO.FileInfo(fullPath);
if (objFileInfo.Exists)
{
objFileInfo.Delete();
}
string sViewString = RenderRazorViewToString(viewName, reporttransactiondata);
var byteArray = ConvertHTMLtoPDF(wkhtmltopdfPath, switches, sViewString);
var fileStream = new FileStream(fullPath, FileMode.Create, FileAccess.Write);
fileStream.Write(byteArray, 0, byteArray.Length);
fileStream.Close();
// Download file at client side...
Response.Clear();
Response.ClearContent();
Response.ClearHeaders();
Response.Charset = "UTF-8";
Response.ContentEncoding = Encoding.UTF8;
Response.AddHeader("Content-Disposition", "attachment; filename=" + Server.UrlEncode(objFileInfo.Name));
Response.ContentType = "application/pdf";
Response.WriteFile(objFileInfo.FullName);
Response.End();
}
catch (Exception ex)
{
// Handle exception here and Log Error to file...
Repositories.Repository objRepository = new Repositories.Repository();
string sLogFilePath = Server.MapPath(@"~/ApplicationFiles/ErrorLogFile.txt");
objRepository.LogErrorToFile(ex, sLogFilePath, this.ControllerContext.Controller.ToString());
}
return View(reporttransactiondata);
}
public string RenderRazorViewToString(string viewName, object model)
{
ViewData.Model = model;
using (var sw = new StringWriter())
{
var viewResult = ViewEngines.Engines.FindPartialView(ControllerContext,viewName);
var viewContext = new ViewContext(ControllerContext, viewResult.View, ViewData, TempData, sw);
viewResult.View.Render(viewContext, sw);
viewResult.ViewEngine.ReleaseView(ControllerContext, viewResult.View);
return sw.GetStringBuilder().ToString();
}
}
/// <summary>
/// Converts given URL or HTML string to PDF.
/// </summary>
/// <param name="wkhtmltopdfPath">Path to wkthmltopdf.</param>
/// <param name="switches">Switches that will be passed to wkhtmltopdf binary.</param>
/// <param name="html">String containing HTML code that should be converted to PDF.</param>
/// <returns>PDF as byte array.</returns>
private static byte[] ConvertHTMLtoPDF(string wkhtmltopdfPath, string switches, string html)
{
// switches:
// "-q" - silent output, only errors - no progress messages
// " -" - switch output to stdout
// "- -" - switch input to stdin and output to stdout
switches = "-q " + switches + " -";
// generate PDF from given HTML string, not from URL
if (!string.IsNullOrEmpty(html))
switches += " -";
var proc = new Process
{
StartInfo = new ProcessStartInfo
{
FileName = Path.Combine(wkhtmltopdfPath, "wkhtmltopdf.exe"),
Arguments = switches,
UseShellExecute = false,
RedirectStandardOutput = true,
RedirectStandardError = true,
RedirectStandardInput = true,
WorkingDirectory = wkhtmltopdfPath,
CreateNoWindow = true
}
};
proc.Start();
// generate PDF from given HTML string, not from URL
if (!string.IsNullOrEmpty(html))
{
using (var sIn = proc.StandardInput)
{
sIn.WriteLine(html);
}
}
var ms = new MemoryStream();
using (var sOut = proc.StandardOutput.BaseStream)
{
byte[] buffer = new byte[4096];
int read;
while ((read = sOut.Read(buffer, 0, buffer.Length)) > 0)
{
ms.Write(buffer, 0, read);
}
}
string error = proc.StandardError.ReadToEnd();
if (ms.Length == 0)
{
throw new Exception(error);
}
proc.WaitForExit();
return ms.ToArray();
}
但这在本地主机上再次工作正常，但在 Azure 服务器上却不行，并给出相同的 500 内部服务器错误，没有任何异常。请看看这里是否有人可以提供帮助。我使用这个 wkhtmltopdf exe 因为我可以根据我的(A4 页面大小的一半)纸张尺寸要求指定 pdf 的高度和宽度。如果有任何其他选项可能不会导致我最终遇到执行外部 exe 或 dll 的问题，请也建议该选项。
最佳答案
像 (#Fabrizio Accatino) 写道:Rotativa 正在运行 wkhtmltopdf.exe。它位于项目根目录下的“Rotativa”文件夹中。所以问题可能是:
- 在部署期间 - 不会创建 Rotativa 文件夹(确保您已在项目中添加该文件夹和 .exe 并将该文件的属性设置为“始终复制”)。
- 服务器上缺少库(确保服务器上存在 - msvcp120.dll 和 msvcr120.dll/在 sysWOW64 文件夹/下)
- 确保应用池用户拥有运行可执行文件和存储临时 .pdf 文件所需的权限。
- 确保路径名称不超过最大长度(我认为是 250 位数字)。
我希望这能指导您解决问题。
关于pdf - 我正在使用 Rotativa 工具来显示 pdf。它在本地主机上运行良好，但在 Azure 平台上不起作用，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/28940062/