The JSON value could not be converted to System.Int32

Question

I want to send data of object to my Web API. The API accepts a parameter of class, which properties are type of int and string.

This is my class:

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Answer 1

In .NET CORE 3.X the serialize/deserialize process is done using System.Text.Json not Newtonsoft Json. Edward's answer did not work entirely for me:

1. Installing from Nuget Manager Microsoft.AspNetCore.Mvc.NewtonsoftJson won't make step 2 to compile.
2. Yes, add in Startup services.AddControllers().AddNewtonsoftJson(); - you will receive an error, AddNewtonsoftJson() not recognized.

At least this happened to me.

As a fix, uninstall what you've installed at step 1. In package manager console, run: Install-Package Microsoft.AspNetCore.Mvc.NewtonsoftJson -Version 3.0.0-preview8.19405.7 . This worked for me.