Accept only int value for ASP.NET Web API action method parameter

In this short post, find solution to how to accept only int value for ASP.NET Web API action method parameter. Below is an example of Web API action method which accepts an int type parameter. And it returns the same value as response.

// GET api/values/5
[HttpGet("{id}")]
public string Get(int id)
{
    return id.ToString();
}

So when you hit http://localhost:59845/api/values/5, you get “5” returned in response. And when you hit http://localhost:59845/api/values/abc, then you get “0” as returned. But what if, you want to accept only integer value and if input parameter is not “int” then return a 404 error.

With attribute routing, you can also define the data type constraint for parameter. So updated action method is,

// GET api/values/5
[HttpGet("{id:int}")]
public string Get(int id)
{
    return id.ToString();
}

So now when you hit http://localhost:59845/api/values/abc, then you shall get 404 error. You can use any data type for route constraint as per your requirement.

Hope you like it. Stay tuned for more!.

Read More

Cascading DropDown List with ASP.NET Core WEB API and AngularJS 2

Cascading DropDown List with ASP.NET Core WEB API and Angular 2

Earlier I posted about Cascading DropDown List using Angular 2 and in this post, we take it to next level and implement it with ASP.NET Core Web API and Angular 2. But starting/configuring AngularJS 2 with ASP.NET Core is not straightforward and it requires some manual configurations to be done. If you are not sure how to do it, I recommend you to read this helpful post to find out post how to start with Angular 2 in ASP.NET Core with TypeScript using Visual Studio 2015.

(more…)

Read More