CODEWITHSUNDEEP
c#asp.net-coremodel-view-controller.net-core
Harry R
Harry R

Reputation: 79

How to resolve "Could not load type 'Microsoft.AspNetCore.Mvc.MvcJsonOptions' " in .Net core 3.1?

when I am running my application then it's showing me error like Could not load type 'Could not load type 'Microsoft.AspNetCore.Mvc.MvcJsonOptions' from assembly 'Microsoft.AspNetCore.Mvc.Formatters.Json, Version=3.1.1.0, Culture=neutral, PublicKeyToken=adb9793829ddae60.

My csproj file contains code like below :

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>netcoreapp3.1</TargetFramework>
    <RootNamespace>Insurance_Customer_Portal_API</RootNamespace>
    <AddRazorSupportForMvc>true</AddRazorSupportForMvc>
  </PropertyGroup>

  <ItemGroup>
    <FrameworkReference Include="Microsoft.AspNetCore.App" />
    <PackageReference Include="Microsoft.AspNetCore.Cors" Version="2.2.0" />
    <PackageReference Include="Microsoft.AspNetCore.Mvc.Versioning.ApiExplorer" Version="4.1.1" />
    <PackageReference Include="SwashBuckle.AspNetCore.MicrosoftExtensions" Version="0.5.0" />
    <PackageReference Include="Swashbuckle.AspNetCore.SwaggerUI" Version="5.0.0" />
  </ItemGroup>

</Project>

Is there any things which I need to change in code ?

Upvotes: 0

Views: 7347

Answers (1)

alsami
alsami

Reputation: 9845

You have some dependencies in your project that are not required anymore, which are causing a mismatch of actually used DLLs that end up in the build-output.

  1. When your project uses Microsoft.NET.Sdk.Web and >= netcoreapp3.0, a reference to Microsoft.AspNetCore.App is not required so that line can be safely removed.
  2. Microsoft.AspNetCore.Cors is also part of the framework now so you don't need an explicit reference.
  3. Last but not least, add a NuGet reference to Microsoft.AspNetCore.Mvc.NewtonsoftJson which can be found here.

Upvotes: 2

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