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PO"Specified method is not supported" error with iTextSharp
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  1. PO"Specified method is not supported" error with iTextSharp
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    copied!<p>I'm using <a href="http://sourceforge.net/projects/itextsharp/" rel="nofollow">iTextSharp</a> to generate PDFs. I've added a test method below that makes a simple page with one paragraph. It works, the PDF is generated, however, sometime after the PDF is sent to the browser I get a NotSupportedException in the Event log (or if I catch them myself from Application_Error). Here's the simplest code that causes this error:</p> <pre><code>public FileStreamResult TestPdf() { using (var ms = new MemoryStream()) { using (var document = new Document()) { PdfWriter.GetInstance(document, ms); document.Open(); document.Add(new Paragraph("Hello World!")); document.Close(); } Response.ContentType = "application/pdf"; Response.AddHeader("content-disposition", "attachment;filename=test.pdf"); Response.Buffer = true; Response.Clear(); Response.OutputStream.Write(ms.GetBuffer(), 0, ms.GetBuffer().Length); Response.OutputStream.Flush(); Response.End(); } return new FileStreamResult(Response.OutputStream, "application/pdf"); } </code></pre> <p>And the error it throws (sometime after the request was completed)</p> <pre><code>Exception information: Exception type: NotSupportedException Exception message: Specified method is not supported. at System.Web.HttpResponseStream.Read(Byte[] buffer, Int32 offset, Int32 count) at System.Web.Mvc.FileStreamResult.WriteFile(HttpResponseBase response) at System.Web.Mvc.FileResult.ExecuteResult(ControllerContext context) at System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult) at System.Web.Mvc.ControllerActionInvoker.&lt;&gt;c__DisplayClass1c.&lt;InvokeActionResultWithFilters&gt;b__19() at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) at System.Web.Mvc.ControllerActionInvoker.&lt;&gt;c__DisplayClass1c.&lt;&gt;c__DisplayClass1e.&lt;InvokeActionResultWithFilters&gt;b__1b() at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) at System.Web.Mvc.Controller.ExecuteCore() at System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) at System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) at System.Web.Mvc.MvcHandler.&lt;&gt;c__DisplayClass6.&lt;&gt;c__DisplayClassb.&lt;BeginProcessRequest&gt;b__5() at System.Web.Mvc.Async.AsyncResultWrapper.&lt;&gt;c__DisplayClass1.&lt;MakeVoidDelegate&gt;b__0() at System.Web.Mvc.Async.AsyncResultWrapper.&lt;&gt;c__DisplayClass8`1.&lt;BeginSynchronous&gt;b__7(IAsyncResult _) at System.Web.Mvc.Async.AsyncResultWrapper.WrappedAsyncResult`1.End() at System.Web.Mvc.MvcHandler.&lt;&gt;c__DisplayClasse.&lt;EndProcessRequest&gt;b__d() at System.Web.Mvc.SecurityUtil.&lt;GetCallInAppTrustThunk&gt;b__0(Action f) at System.Web.Mvc.SecurityUtil.ProcessInApplicationTrust(Action action) at System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) at System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean&amp; completedSynchronously) </code></pre> <p>Any ideas on how I could fix this? Is there a problem with the library or something else?</p> <p>Thanks!</p> <p><strong>Edit:</strong></p> <p>To solve this problem, rather than return FileStreamResult I was able to use FileContentResult instead via the Controller's File method. Here's the working code:</p> <pre><code>public ActionResult TestPdf() { using (var ms = new MemoryStream()) { using (var document = new Document()) { PdfWriter.GetInstance(document, ms); document.Open(); document.Add(new Paragraph("Hello World!")); document.Close(); } Response.ContentType = "application/pdf"; Response.AddHeader("content-disposition", "attachment;filename=test.pdf"); Response.Buffer = true; Response.Clear(); return File(ms.ToArray(), "application/pdf"); } } </code></pre>
 

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