如何在 ASP.NET Core MVC“待办事项”应用程序中提取 URL 的文件名并在视图中显示给用户？

Question

I have an ASP.NET Core MVC To Do app. When I start the app, the app has a default URL of https://localhost but how do I get the filename from a URL like this one https://localhost/14-11-2020 . I need to get the 14-11-2020 as parameter and display it in a .cshtml file between <time></time> tags as 14 / 11 / 2020 . Each time the user changes the date, it needs to show the tasks from that date (since this is a "TODO" app). I have already setup the model with a database with DateTime attribute.

My question is that: how do I extract the filename of a URL and show it to the user in the View?

Answer 1

how do I extract the filename of a URL and show it to the user in the View?

The AbsolutePath property contains the path information that the server uses to resolve requests for information in C#. (More Details)

passing data to view from controller (more details) I am using ViewData here,

ViewData is a ViewDataDictionary object accessed through string keys. String data can be stored and used directly without the need for a cast, but you must cast other ViewData object values to specific types when you extract them. You can use ViewData to pass data from controllers to views and within views, including partial views and layouts.

[HttpGet]
    public IActionResult Index()
    {
      Uri baseUri = new Uri("http://www.contoso.com/");
      Uri myUri = new Uri(baseUri, "catalog/shownew.htm?date=today");
      string name = Path.GetFileName(myUri.AbsolutePath);
      ViewData["FileName"] = name;
      return View();
    }

For the Path class use namespace using System.IO; and inside view use,

<title>@ViewData["FileName"] - WebApplication</title>

Answer 2

You can parse the url params from the method on the controller

public class ToDoController : Controller
{
    [HttpGet]
    [Route("{date:DateTime}")]
    public IActionResult Index(DateTime date)
    {
        //// filter by date

        return View();
    }
}

In the above example a url of http://localhost:1234/todo/01-01-2020 would pass a date time of '01/01/2020 00:00:00' into the todo controller method

Answer 3

Get the date from RouteData and store it in ViewBag or ViewDate in controller, then access it the view:

Controller:

public IActionResult Index()
{
    string date = RouteData.Values.Values.LastOrDefault().ToString();
    var mydate = date.Replace("-", "/");
    ViewBag.CurrentDate = mydate;
    return View();
}

View:

<time>@ViewBag.CurrentDate</time>