Url query parameter with no value on ASP.NET Web API 2

Question

This is my controller's action for POST api/foo?bar=true requests:

[HttpPost]
[Route("api/foo")]
public async Task<HttpResponseMessage> Update(bool bar)
{}

It works fine, but when I try to do the same with a query parameter with no value like POST api/foo?bar, the action above doesn't work and this message is returned:

The parameters dictionary contains a null entry for parameter 'bar' of non-nullable type 'System.Boolean' for method 'System.Threading.Tasks.Task`[System.Net.Http.HttpResponseMessage] Update(Boolean)' in 'Foo.Controllers.FooController'. An optional parameter must be a reference type, a nullable type, or be declared as an optional parameter.

How can I make requests like POST api/foo?bar get into the Update() action? Optional parameter/Other type for the parameter?

Any help is welcome! Thanks.

Iñigo · Accepted Answer · 2019-07-30 11:26:39Z

0

Solved!

Made the parameter nullable leaving the action like this:

[HttpPost]
[Route("api/foo")]
public async Task<HttpResponseMessage> Update(bool? bar)
{}

answered Jul 30, 2019 at 11:26

Iñigo

2,02610 gold badges33 silver badges62 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Url query parameter with no value on ASP.NET Web API 2

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related