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<li>
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<a asp-controller="Todo" asp-action="Index">My to-dos</a>
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</li>
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The asp-controller and asp-action attributes on the <a> element
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are called tag helpers. Before the view is rendered, ASP.NET Core
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replaces these tag helpers with real HTML attributes. In this case, a URL
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to the /Todo/Index route is generated and added to the <a> element
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43
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Update the layout
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as an href attribute. This means you don't have to hard-code the route
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to the TodoController . Instead, ASP.NET Core generates it for you
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automatically.
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If you've used Razor in ASP.NET 4.x, you'll notice some syntax
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changes. Instead of using @Html.ActionLink() to generate a link
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to an action, tag helpers are now the recommended way to create
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links in your views. Tag helpers are useful for forms, too (you'll see
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why in a later chapter). You can learn about other tag helpers in
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the documentation at https://docs.asp.net.
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44
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Add external packages
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Add external packages
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One of the big advantages of using a mature ecosystem like .NET is that
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the number of third-party packages and plugins is huge. Just like other
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package systems, you can download and install .NET packages that help
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with almost any task or problem you can imagine.
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NuGet is both the package manager tool and the official package
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repository (at https://www.nuget.org). You can search for NuGet
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packages on the web, and install them from your local machine through
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the terminal (or the GUI, if you're using Visual Studio).
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Install the Humanizer package
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At the end of the last chapter, the to-do application displayed to-do
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items like this:
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The due date column is displaying dates in a format that's good for
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machines (called ISO 8601), but clunky for humans. Wouldn't it be nicer
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if it simply read "X days from now"?
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You could write code yourself that converted an ISO 8601 date into a
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human-friendly string, but fortunately, there's a faster way.
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The Humanizer package on NuGet solves this problem by providing
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methods that can "humanize" or rewrite almost anything: dates, times,
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durations, numbers, and so on. It's a fantastic and useful open-source
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45
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Add external packages
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project that's published under the permissive MIT license.
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To add it to your project, run this command in the terminal:
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dotnet add package Humanizer
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If you peek at the AspNetCoreTodo.csproj project file, you'll see a new
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PackageReference line that references Humanizer .
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Use Humanizer in the view
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To use a package in your code, you usually need to add a using
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statement that imports the package at the top of the file.
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