How do I use query parameters in attributes?

Question

I want to use query parameters in my endpoint attributes but I'm not sure how to use them.

I tried this:

[HttpPost("fooBar/{version}?amount={amount}&date={date}")]

But I get this error instead:

Microsoft.AspNetCore.Routing.Patterns.RoutePatternException: The literal section '?amount=' is invalid. Literal sections cannot contain the '?' character. at Microsoft.AspNetCore.Routing.Patterns.RoutePatternParser.Parse(String pattern)

Or, what's the proper approach to set the query parameters if I want to hit an endpoint that looks like the one above?

@Euridice01 don't use them in the route template, they will be included once there are matching parameters in the action. — Nkosi, Jan 07 '20 at 01:56
@Nkosi can you provide an example with the proper way to do this? I am also using MediatR with .net core. Not sure if that changes anything as well. — Euridice01, Jan 07 '20 at 01:58

Nkosi · Accepted Answer · 2020-01-07T02:02:17.207

Don't use them in the route template, they will be included once there are matching parameters in the action.

//POST fooBar/v2?amount=1234&date=2020-01-06
[HttpPost("fooBar/{version}")]
public IActionResult FooBar(string version, int amount,  DateTime date) {
    //...
}

Or explicitly state where they will come from using attributes

//POST fooBar/v2?amount=1234&date=2020-01-06
[HttpPost("fooBar/{version}")]
public IActionResult FooBar([FromRoute]string version, [FromQuery]int amount,  [FromQuery]DateTime date) {
    //...
}

Reference Model Binding in ASP.NET Core

How do I use query parameters in attributes?

1 Answers1