How to pass array property in model Asp.net Core in HttpGet?

Question

I have Asp.Net WebApi 2 project, Now converted into Asp.Net Core 2.0

HttpGet method with array property not able to bind model.

the model comes null in Asp.net Core 2.0 (using swagger to test)

Any changes required?

public class Customer
{       
    public string name { get; set; }
    public new string[] systemId { get; set; }
}

CustomerController.cs

[HttpGet]
public IActionResult RetrieveData(Customer filters)
{
// code

In Asp.net WebApi2 It was working properly, but in Asp.net Core values are not able to bind, values are null.

If change it to [HttpPost] it will work fine but why not with [HttpGet] as working like ASP.Net WebApi2.

provide a minimal reproducible example that can be used to reproduce the problem. include example request. — Nkosi
– Nkosi, Commented Oct 17, 2017 at 10:55
@Neo, how do you test the request? I think you should do: GET YourApi/RetrieveData?name=SomeName&system_id=1&system_id=2 — cnom
– cnom, Commented Mar 26, 2018 at 9:49

abatishchev · Accepted Answer · 2018-06-11 19:08:12Z

1

.net core changed it default binding to FromBody. So your signature should now be:

[HttpGet]
public IActionResult RetrieveData([FromBody]Customer filters)
{
// code

And send it as body.

You could also use the data-attribute: FromQuery.

cheers!

abatishchev

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answered Oct 17, 2017 at 10:57

Roelant M

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9 Comments

a GET request has no body

ahh, correct, misread it! but the FromQuery would still apply

You are close to the answer. review this learn.microsoft.com/en-us/aspnet/core/mvc/models/model-binding and reformulate your answer.

both properties are empty? how does your url look like?

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