WebAPI request query parameter values are null in .netcore

Question

I have a REST API controller in new .NET CORE app. If I make the following call: https://localhost/api/search?query=someText, I am able to execute the code below, so it looks like the routing is correct, however, query.query is always null. I would expect the value to be "someText".

What is wrong here?

[HttpGet]
public IActionResult Get([FromQuery]SearchQuery query)
{
} 

public class SearchQuery
    {
        [FromQuery(Name = "query")]
        public string query { get; set; }

    }

Please try changing the parameter name in your Get action method from SearchQuery query to SearchQuery model to avoid ambiguity with the property name inside your model. — Timothy Macharia
– Timothy Macharia, Commented Jun 9, 2019 at 1:33

Diogo Rocha · Accepted Answer · 2019-06-09 01:38:39Z

4

The problem is that your parameters names conflict causing an ambiguity, because they are all query.

If you have it like this, it will work:

[HttpGet]
public IActionResult Get([FromQuery]SearchQuery queryParam)
{
  // here you can use queryParam.query
} 

public class SearchQuery
{
    [FromQuery(Name = "query")]
    public string query { get; set; }

}

You can also made it to work changing your parameter [FromQuery(Name = "query")] name to something else than query, but in this case you will need to change your request query string according.

edited Jun 9, 2019 at 1:38

answered Jun 9, 2019 at 1:33

Diogo Rocha

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