how to read webapi request as proper json format to populate object in webapi

Question

How do I get this web api request payload to be read as a normal json object inside the webapi. I'm sure I have to adjust the format somehow but I'm not familiar with how to read this and/or switch it to populate a custom object in the webapi.

here is a chrome dev screen to show how its coming over

here are some fiddler screenshots

my api... I'm trying different ways but bottom line is I need it to return a byte array since the going is to download a file.

here is the webapi

        [Route("api/excel/DownloadTopdayTrades2/")]
    [HttpPost]
    public HttpResponseMessage DownloadTopdayTrades2([FromBody]ListTradeDetailDTO trades)
    {

Can you show the code of the controller that is handling the request? — Marco Talento
– Marco Talento, Commented Feb 21, 2017 at 18:49
I have edit my comment below, I think that you are missing the [FromBody] atrribute! — Marco Talento
– Marco Talento, Commented Feb 21, 2017 at 18:55

Marco Talento · Accepted Answer · 2017-02-21 18:54:24Z

1

You have multiple solutions, you can read the body of the request and binding directly to a C# class var result = await Request.Content.ReadAsAsync<IEnumerable<ClassName>>(); or you can read it to a dynamic variable

dynamic obj = await Request.Content.ReadAsAsync<JObject>();
var y = obj.trades[0].AccountNumber;

EDIT: public byte[] DownloadTopdayTrades([FromBody]IEnumerable<TradeDetailDTO> trades) reads the content from the body request!

edited Feb 21, 2017 at 18:54

answered Feb 21, 2017 at 18:48

Marco Talento

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12 Comments

solarissf Over a year ago

I tried your edit but its null. as for dynamic variable example,, I get await must be task

Marco Talento Over a year ago

The problem is that you have an object and inside that object you have the trades property! You have to create a new DTO that has a property trades of type List<TradeDetailDTO > and then the serialization will work!

Marco Talento Over a year ago

public class MyDTO {      public List<TradeDetailDTO> trades { get; set; } }  public byte[] DownloadTopdayTrades([FromBody] MyDTO trades)

You have to create a new DTO with property trades and then change the action signature!

Marco Talento Over a year ago

Try to read the form date like this HttpResponseMessage DownloadTopdayTrades2(FormDataCollection formData)

Marco Talento Over a year ago

No problem, dont forget to upvote my answers! :) var dto = JsonConvert.DeserializeObject< MyDTO >(json); try this way, I am assuming that you are using Newtonsoft Json Library

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