Could not load type 'Microsoft.AspNetCore.Mvc.MvcJsonOptions' from assembly 'Microsoft.AspNetCore.Mvc.Formatters.Json,

Question

I am in the process of migrating an application from dotnetcore2.0 to 3.1 and I am facing some issues with the newtonsoft dependency.

services.AddAuthorization()
                .AddApiExplorer()
                .AddMvcOptions(option => option.EnableEndpointRouting = false)
                .AddNewtonsoftJson(n =>
                {
                    n.SerializerSettings.Converters.Add(new StringEnumConverter());
                    n.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
                    n.SerializerSettings.NullValueHandling = NullValueHandling.Ignore;
                })
                .AddDataAnnotations();

When I try to debug the application, I am getting this error "Could not load type 'Microsoft.AspNetCore.Mvc.MvcJsonOptions'" from the module `` BuildWebHost(args).Run(); — Chinnadurai
– Chinnadurai, Commented Oct 21, 2021 at 8:59

KimKulling · Accepted Answer · 2021-10-21 09:19:34Z

1

If I get it right the issue is caused by Swashbuckle 4 used in a .Net Core 3-Environment. What you can do to solve this is to upgrade to Swashbuckle 5. (use command install-package Swashbuckle.AspNetCore).

I found this answer here: Check this answer

answered Oct 21, 2021 at 9:19

KimKulling

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