PUT request values always null

I'm trying to update an object to an API using PUT method, but when the update() method in the API is called, passed values are always null.

null

Controller in the API :

[HttpPut]
[Route("{id:int}", Name = "UpdatePolicy")]
[SwaggerResponse(HttpStatusCode.NoContent, Description = "No Content")]
[ValidateModel]
public virtual void Update(int id, [FromBody]Policy p)
{
_policyBusinessService.Update(id, p);
}


Code from Angular component :

update(id) {

id = this.policyId;
this.policyModel.id = id;
console.log(this.policyModel);
this.policyService.update(this.policyId, this.policyModel).subscribe(res => {
// this.router.navigate(['/policies', id, 'get']);
}, (e) => {
console.log(e);
}
);
}


code from service :

update(id: number, pm: PolicyModel): Observable<PolicyModel> {
console.log(pm);
return this.http.put<PolicyModel>(`${environment.baseApiUrl}/${environment.apiVersion}/policies/${id}`, {pm});
}


what is passed to the PUT request :

{id: 1, name: "new name"}


So, the data sent from service is like just above. And in the api update() method, the "Policy" object is always null. I first thought it had to do with [FromBody] but now I think it may have something to do with the JSON data format, but not sure..

update()

null

[FromBody]

And if that's right, what can I do to pass the right data in my request?

Thanks guys!

EDIT : It seems I was just missing the 'content-type' in the header. So I modified the service like this :

update(id: number, pm: PolicyModel): Observable<PolicyModel> {
console.log('before stringify :' + pm);
const stringifiedPm = JSON.stringify(pm);
console.log('after stringify :' + test);
return this.http.put<PolicyModel>(`${environment.baseApiUrl}/${environment.apiVersion}/policies/${id}`, stringifiedPm,
{headers: { 'Content-Type': 'application/json' }});
}


So now it works fine.

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