CODEWITHSUNDEEP
c#asp.netasp.net-mvcasp.net-corehttp
Tony Chen
Tony Chen

Reputation: 19

Why this HTTPGET method in Controller can work？

I'm learning ASP.NET CORE 6 with MS official website below： https://learn.microsoft.com/en-us/aspnet/core/tutorials/first-mvc-app/search?view=aspnetcore-6.0

Then I found a instruction said "There's no [HttpPost] overload of the Index method as you might expect. You don't need it, because the method isn't changing the state of the app, just filtering data." and I'm confused with it.

the following code is the sample from teaching page, a form tag without method atrribute, so I think it should be "post" as the default.

<form asp-action="index">  
    Search: <input type="text" name="searchText" />
    <input type="submit" value="GO" class="btn btn-secondary" />
</form>

And the following action method without [HTTPXXX] attribute should be [HTTPGET] as the default, right?

// GET: Movies
public async Task<IActionResult> Index(string searchText)
{
    if (!string.IsNullOrEmpty(searchText))
    {
        var result = _context.Movie.Where(m=>m.Title!.Contains(searchText));
        return View(await result.ToListAsync());
    }
      return View(await _context.Movie.ToListAsync());
}

So the question is why I ask a request with POST method, but it still can lead to a GET action method?

Upvotes: 0

Views: 835

Answers (2)

Md Farid Uddin Kiron
Md Farid Uddin Kiron

Reputation: 22495

And the following action method without [HTTPXXX] attribute should be [HTTPGET] as the default, right?

Well, if you don't define your from submit method attribute by default it will authometically generate method type as post like this method="post". If you could inspect you can see as below:

enter image description here

So the question is why I ask a request with POST method, but it still can lead to a GET action method?

Yes you are right. In that case, either you have to define as method="get" or you can define and controller and action together. Like this

<form asp-action="index" asp-controller="YourController">

Or

 <form asp-action="index" method="get">

Note: In official document they used asp-controller="Movies" however, you haven't use it in your code which created the issue.

Output:

enter image description here

Note: Using method attribute method="get" is more suitable to resolve your issue other than in browser compiler autometically generate post by default.

Upvotes: 1

SergVro
SergVro

Reputation: 971

According to HTML specification default value for form.method attributge is 'get'. See https://www.w3.org/TR/html401/interact/forms.html#edef-FORM and https://developer.mozilla.org/en-US/docs/Web/API/HTMLFormElement/method. That's why it works with GET action, as if you specified <form asp-action="index" method="get">

Upvotes: 1

Related Questions