解决方法
使用FileContentResult：
@H_301_10@protected FileContentResult ViewPdf(string pageTitle,string viewName,object model)
{
// Render the view html to a string.
string htmlText = this.htmlViewRenderer.RenderViewToString(this,viewName,model);
// Let the html be rendered into a PDF document through iTextSharp.
byte[] buffer = standardPdfRenderer.Render(htmlText,pageTitle);
// Return the PDF as a binary stream to the client.
return File(buffer,"application/pdf","file.pdf");
}
