sending multiple objects to back-end post method using angular 4 http services

Question

Hi I am trying to send two objects using http post method to backend

my environment is angular4, typescirpt, asp.net MVC 5

but it is throwing 500 internal server error

the same approach if I am passing single object to the backend my backend method is getting called

here is the code with passing single object

clientSidePostCall(Results:any,Details:any):Observable<any>{
   return this._http.post(Global.ENDPOINT +'BackendMethod/',Results)
            .map((response: Response) => <any>response.json())
            .catch((err:any) => { throw err; });
        }

the above code is working fine if I send Results object to BackendMethod if it is expecting single parameter

The same code is not working if I send multiple objects to backendMethod when it is expecting two objcets.

   clientSidePostCall(Results:any,Details:any):Observable<any>{
       return this._http.post(Global.ENDPOINT +'BackendMethod/',Results,Details)
                .map((response: Response) => <any>response.json())
                .catch((err:any) => { throw err; });
            }

The above code is not working and throwing 500 internal server error

here is my backend method signature

 [HttpPost]
        public HttpResponseMessage BackendMethod([FromBody] resultsType Results, [FromBody] detailsType Details)

please help me with this

and I am having another doubt that can we pass object in http.get in angular 4 and typescript

Kevin · Accepted Answer · 2018-03-06 19:12:23Z

4

In your angular code make the Results, and Details be properties of a larger object... So send this object:

const myPostBody = { resultsType: Results, detailsType: Details }

return this._http.post(Global.ENDPOINT +'BackendMethod', myPostBody)
                .map((response: Response) => <any>response.json())
                .catch((err:any) => { throw err; });
            }

Also make sure that your API class type Results actually matches the Class Results that you're sending it

answered Mar 6, 2018 at 19:12

Kevin

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1 Comment

gary Over a year ago

I have followed that, Thank you Kevin

funkizer · Accepted Answer · 2018-03-06 19:10:38Z

3

I don't know how asp.net works but the third argument of HttpClient.post is not for another post body. In fact a post request cannot have two bodies. If your backend expects an array, do:

this._http.post(url, [Results, Details])

answered Mar 6, 2018 at 19:10

funkizer

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7 Comments

Pankaj Parkar Over a year ago

Will server will deserialize it in correct form? I doubt

funkizer Over a year ago

Depends on the server. If it's JSON-decoding the body and expects it to be an array, yes.

funkizer Over a year ago

Ie. whatever you pass to post() as the body, gets JSON encoded and sent as the raw post body by default.

funkizer Over a year ago

In JSON it cannot.. An array is [1, 2, { "foo": 12} ] and object is {"a":1, "foo":"foo"}

funkizer Over a year ago

As said, I don't know asp.net enough to tell from the code snippet what the server is expecting, an array or a few nested objects?

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NitinSingh · Accepted Answer · 2018-03-09 10:04:40Z

1

Wrapping up child entities in a parent entity is required for HTTP Post. The child entity would usually be a business entity. On the receiving service end, you will use the entity names as properties to receive the individual items. All this assume your entity itself is serializable.

answered Mar 9, 2018 at 10:04

NitinSingh

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