Exception when trying to return Report Object

code_blue

Hi

I am trying to configure JSReport to return PDF from static HTML. I am facing Unhandled exception. This is the same code.

   [MiddlewareFilter(typeof(JsReportPipeline))]
   public async Task<jsreport.Types.Report> InvoiceWithCover()

    {

        var report = await JsReportMVCService.RenderAsync(new RenderRequest()

        {

            Template = new Template

            {

                Content = "<html><body><h1>Hello</h1></body></html>",

                Engine = Engine.None,

                Recipe = Recipe.ChromePdf

            },

            Options = new RenderOptions()

            {

                Preview = true

            }

        }); 
       return report;
 }

This is exception message

0_1611854806293_Screen Shot 2021-01-28 at 5.26.30 PM.png

code_blue

@jan_blaha Can you please help with this?

jan_blaha

When you use [MiddlewareFilter(typeof(JsReportPipeline))], you want to return an MVC View that produces some content and pipe it to jsreport which does report rendering and streams the result to the caller.

When you use JsReportMVCService.RenderAsync, it returns jsreport.Report entity, which wraps the rendering output. You can do what ever you want with it, but you are just returning it from the controller action. You probably don't want that. The asp.net mvc tryies to serialize it and fails.

You either should put the HTML to the view and use the jsreport MiddlewareFilter. Or properly return stream from the controller action. You can find the report stream on the report.Content.

Just linking basic example:
https://github.com/jsreport/jsreport-dotnet-example-webapp

code_blue

@jan_blaha Thanks for your explanation. So i can take stream from report.content and return a byte array or File?
If I am using JsReportMVCService.RenderAsync then i don't need to use the MiddlewareFilter?

jan_blaha

Yes, you can take report.Content from ReportMVCService.RenderAsync result and return it in the same way as any other stream.

The MiddlewareFilter should be used only when you want to return View.