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classes that interact with a database.
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Adding a service class that interacts with Entity Framework Core
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(and your database) with the singleton lifecycle (or other lifecycles)
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can cause problems, because of how Entity Framework Core
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manages database connections per request under the hood. To
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avoid that, always use the scoped lifecycle for services that
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interact with Entity Framework Core.
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The TodoController that depends on an injected ITodoItemService will
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be blissfully unaware of the change in services classes, but under the
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hood it'll be using Entity Framework Core and talking to a real database!
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Test it out
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Start up the application and navigate to http://localhost:5000/todo .
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The fake items are gone, and your application is making real queries to
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the database. There doesn't happen to be any saved to-do items, so it's
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59
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Create a new service class
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blank for now.
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In the next chapter, you'll add more features to the application, starting
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with the ability to create new to-do items.
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60
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Add more features
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Add more features
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Now that you've connected to a database using Entity Framework Core,
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you're ready to add some more features to the application. First, you'll
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make it possible to add new to-do items using a form.
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61
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Add new to-do items
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Add new to-do items
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The user will add new to-do items with a simple form below the list:
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Adding this feature requires a few steps:
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Adding a form to the view
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Creating a new action on the controller to handle the form
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Adding code to the service layer to update the database
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Add a form
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The Views/Todo/Index.cshtml view has a placeholder for the Add Item
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form:
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<div class="panel-footer add-item-form">
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<!-- TODO: Add item form -->
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</div>
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To keep things separate and organized, you'll create the form as a partial
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view. A partial view is a small piece of a larger view that lives in a
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separate file.
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Create an AddItemPartial.cshtml view:
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Views/Todo/AddItemPartial.cshtml
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Add new to-do items
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@model TodoItem
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<form asp-action="AddItem" method="POST">
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<label asp-for="Title">Add a new item:</label>
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<input asp-for="Title">
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