text
stringlengths 0
13.4k
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Since Humanizer will be used to rewrite dates rendered in the view, you
|
can use it directly in the view itself. First, add a @using statement at the
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top of the view:
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Views/Todo/Index.cshtml
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@model TodoViewModel
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@using Humanizer
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// ...
|
Then, update the line that writes the DueAt property to use Humanizer's
|
Humanize method:
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<td>@item.DueAt.Humanize()</td>
|
Now the dates are much more readable:
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46
|
Add external packages
|
There are packages available on NuGet for everything from parsing XML
|
to machine learning to posting to Twitter. ASP.NET Core itself, under the
|
hood, is nothing more than a collection of NuGet packages that are
|
added to your project.
|
The project file created by dotnet new mvc includes a single
|
reference to the Microsoft.AspNetCore.All package, which is a
|
convenient "metapackage" that references all of the other
|
ASP.NET Core packages you need for a typical project. That way,
|
you don't need to have hundreds of package references in your
|
project file.
|
In the next chapter, you'll use another set of NuGet packages (a system
|
called Entity Framework Core) to write code that interacts with a
|
database.
|
47
|
Use a database
|
Use a database
|
Writing database code can be tricky. Unless you really know what you're
|
doing, it's a bad idea to paste raw SQL query strings into your application
|
code. An object-relational mapper (ORM) makes it easier to write code
|
that interacts with a database by adding a layer of abstraction between
|
your code and the database itself. Hibernate in Java and ActiveRecord in
|
Ruby are two well-known ORMs.
|
There are a number of ORMs for .NET, including one built by Microsoft
|
and included in ASP.NET Core by default: Entity Framework Core. Entity
|
Framework Core makes it easy to connect to a number of different
|
database types, and lets you use C# code to create database queries that
|
are mapped back into C# models (POCOs).
|
Remember how creating a service interface decoupled the
|
controller code from the actual service class? Entity Framework
|
Core is like a big interface over your database. Your C# code can
|
stay database-agnostic, and you can swap out different providers
|
depending on the underlying database technology.
|
Entity Framework Core can connect to relational databases like SQL
|
Server, PostgreSQL, and MySQL, and also works with NoSQL (document)
|
databases like Mongo. During development, you'll use SQLite in this
|
project to make things easy to set up.
|
48
|
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