Object getting null value FromForm in ASP.NET Core Web API

Question

API controller and the request send from react app.

When using FromForm only then getting null value

    [Route("PotService")]
    [HttpPost]
    [Consumes("application/json")]
    public IActionResult Post([FromForm] ServiceInfo serviceInfo)
    {
        //using (MemoryStream stream = new MemoryStream())
        //{
        //    service.Images.CopyToAsync(stream);
        //}
        bool result = _serManager.AddService(serviceInfo);
        return Ok(result);
    }

You have Consumes("application/json") and then using [FromForm]. If you're expecting Json then use [FromBody]. [FromForm] is for "application/x-www-url-formencoded" — Yitz
– Yitz, Commented Sep 16, 2022 at 11:09
NO it's not happening, when i use "application/x-www-url-formencoded" and [FromForm] not hit my controller, i also change on my frontend const res = await fetch(newSerPost, { method: 'POST', body: JSON.stringify(data), headers: { 'Content-type': 'application/x-www-url-formencoded; carset=UTF-8', }, — Mahmud Hasan
– Mahmud Hasan, Commented Sep 16, 2022 at 12:09

Zhi Lv · Accepted Answer · 2022-09-19 07:50:03Z

0

The Consumes attribute specifies data types that an action accepts. If you are using application/json, it will receive the parameters transferred via the request body. And from your frontend code, it also seems that you are transfer the data from body, so, try to use the [FromBody] attribute and use the following code.

[Route("PotService")]
[HttpPost]
[Consumes("application/json")]
public IActionResult Post([FromBody] ServiceInfo serviceInfo)
{
    //using (MemoryStream stream = new MemoryStream())
    //{
    //    service.Images.CopyToAsync(stream);
    //}
    bool result = _serManager.AddService(serviceInfo);
    return Ok(result);
}

If you want to send the parameters via the Form, try to use application/x-www-form-urlencoded or multipart/form-data data type.

Refer to the following screenshot:

answered Sep 19, 2022 at 7:50

Zhi Lv

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