POST JSON from Angular frontend to ASP.NET backend

Question

I would like to send data (originally arrays) as JSONs to my MVC-controller in the backend. I was trying this:

my-ng-service.ts

//... setEmployees(employees) { var employeesJSON = JSON.stringify(employees); console.log(employeesJSON); //working this.http.post('/api/employees', employeesJSON).subscribe(); } //... 

EmployeesController.cs

//... [Route("api/[controller]")] [HttpPost] public void Post(JsonResult data) { Console.Write("hallo: " + data); //error see below } //... 

I don't know how I have to write my controller. Can anybody help me?

Current error:

System.Argument.Exception: Type 'Microsoft-AspNetCore.Mvc:JsonResult' does not have a default constructor Parameter name: type

Thanks in forward!

Answer 1

JsonResult is a type you use to output JSON from an action method, not as input parameter.

See ASP.NET Core MVC : How to get raw JSON bound to a string without a type? and ASP.NET MVC Read Raw JSON Post Data: you can change the parameter type to dynamic or JObject, or you can manually read the request body as string.

But you should really reconsider this. Creating a model so you can bind your model strongly-typed is a matter of seconds work, and will benefit you greatly in the future.

Answer 2

Actually write the model name that you want to get from http request

[Route("api/[controller]")] [HttpPost] public void Post(YourJsonModel ModelObject) { Console.Write("hallo: " + data); //error see below }