How to fix 'IMvcBuilder' does not contain a definition for 'AddNewtonsoftJson'
By FoxLearn 2/18/2024 9:45:32 AM 87
This post shows you how to fix 'Error CS1061 'IMvcBuilder' does not contain a definition for 'AddNewtonsoftJson' and no accessible extension method 'AddNewtonsoftJson' accepting a first argument of type 'IMvcBuilder' could be found (are you missing a using directive or an assembly reference?)'
To solve the problem you can right click on your project, then select Manage Nuget Packages => Install
Microsoft.AspNetCore.Mvc.NewtonsoftJson
Finally, you can call
services.AddControllers().AddNewtonsoftJson();
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