WEB.API does not deserialize incoming JSON in POST method [duplicate]

Question

I have created Web.Api based on .Net-Core. There are two methods:

IEnumerable GetRoles() - (Get)
ResponseObject GetUsers(PagerRequest pagerRequest) - (Post). It has the following attributes: [Route("api/users/getusers")] [HttpPost]

Both methods are called by Angular. Method GetRoles is working find but problem is in POST.

PagerRequest is a simple class which has a few int properties. It's filled in by Angular. Fiddler shows correct JSON:

POST http://localhost/Pir.API/api/users/getusers HTTP/1.1
Host: localhost
Connection: keep-alive
Content-Length: 84
Accept: application/json, text/plain, */*
Origin: http://localhost:4200
User-Agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36
content-type: application/json
Referer: http://localhost:4200/
Accept-Encoding: gzip, deflate, br
Accept-Language: ru-RU,ru;q=0.9,en-US;q=0.8,en;q=0.7

{
  "CountButtons": 5,
  "ItemsCount": 0,
  "PageSize": 5,
  "CurrentPageIndex": 0
}

GetUsers method is calling but input parameter is not initialized. In another words desirialization is not working and I cannot understand why.

Before this project was based on classic .Net and run in the IIS. It was working fine. But .Net CORE is a problems.

Who knows where the problem is?

Below code examples:

-------------- PagerRequest.cs --------------------

public class PagerRequest
{
     public int ItemsCount { get; set; }
     public int PageSize { get; set; }
     public int CurrentPageIndex { get; set; }
     public int CountButtons { get; set; }
 }

-------------- PagerRequest.ts --------------------

export class PagerRequest{
    ItemsCount:number;
    PageSize:number;
    CurrentPageIndex:number;
    CountButtons:number;    
}

Marcus Höglund · Accepted Answer · 2018-09-25 07:36:07Z

6

You need to tell the framework to read the data from the request body. Do this with the FromBody Attribute

[HttpPost]
ResponseObject GetUsers([FromBody]PagerRequest pagerRequest)

Note: If performing a HttpPost, the name GetUsers is missleading. A tip is to change that

answered Sep 25, 2018 at 7:36

Marcus Höglund

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2 Comments

Mike Tkachev Over a year ago

Thanks. It helped. Why was it working in classing application without this attribute?

Marcus Höglund Over a year ago

@MikeTkachev Np, please accept answer :), In Asp.Net Web Api/MVC reading request data from the body was default in Controller methods.

staticvoidmain · Accepted Answer · 2018-09-25 07:46:32Z

0

1) You are missing the FromBody.

2) One tip while working on apis is to configure Swagger . Swagger creates a sample html by default where you can see what type of request body is needed from the UI frameworks (for example see this url https://petstore.swagger.io, all the api endpoints are visible as html by default and we can see the type of request needed).

Hope this helps.

answered Sep 25, 2018 at 7:46

staticvoidmain

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