使用PDFSharp时访问Azure Web App中的字体时出错

Question

我正在使用PDFSharp在我的网络应用程序中动态生成PDF.Web应用程序在本地工作正常但是,当我将应用程序推送到Azure(作为Web应用程序)时,我得到以下异常:

{"message":"An error has occurred.","exceptionMessage":"Internal error. Font data could not retrieved.","exceptionType":"System.InvalidOperationException","stackTrace":" at PdfSharp.Fonts.OpenType.FontData.CreateGdiFontImage(XFont font, XPdfFontOptions options)\r\n at PdfSharp.Fonts.OpenType.FontData..ctor(XFont font, XPdfFontOptions options)\r\n at PdfSharp.Fonts.OpenType.OpenTypeDescriptor..ctor(XFont font, XPdfFontOptions options)\r\n at PdfSharp.Fonts.OpenType.OpenTypeDescriptor..ctor(XFont font)\r\n at PdfSharp.Fonts.FontDescriptorStock.CreateDescriptor(XFont font)\r\n at PdfSharp.Drawing.XFont.get_Metrics()\r\n at PdfSharp.Drawing.XFont.Initialize()\r\n at PdfSharp.Drawing.XFont..ctor(String familyName, Double emSize)\r\n at Spiro.Services.OrderService.GetOrderLabel(Int32 id, Nullable`1 quantity)\r\n at Spiro.Web.Controllers.WebApi.V1.OrderController.GetOrderLabel(Int32 id, Nullable`1 quantity)\r\n at lambda_method(Closure , Object , Object[] )\r\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass10.b__9(Object instance, Object[] methodParameters)\r\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.Execute(Object instance, Object[] arguments)\r\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Controllers.ApiControllerActionInvoker.d__0.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Controllers.ActionFilterResult.d__2.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Controllers.AuthenticationFilterResult.d__0.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Dispatcher.HttpControllerDispatcher.d__1.MoveNext()"}

我创建文本如下:

var document = new PdfDocument();
var page = document.AddPage();
var gfx = XGraphics.FromPdfPage(page);
var font = new XFont("Calibri", 30);


gfx.DrawString(rows[i], font, XBrushes.Black,
    new XPoint(XUnit.FromMillimeter(10),
               XUnit.FromMillimeter(10)),
               XStringFormats.TopLeft);

我可以看到Azure服务器安装了一堆字体 - 我不知道问题是什么...感谢您的帮助.

Answer 1

Azure应用服务(又名Azure网站)实施了许多比云服务或IaaS(VM)更严格的安全约束.被阻止的一件事是访问大部分GDI API表面区域,其中包括一些字体操作.正如其他人所指出的那样,如果相同的代码适用于普通的IaaS VM,云服务,甚至是本地桌面/笔记本电脑,那么您遇到的问题就是对底层GDI调用的硬性阻碍.