ASP.NET Core MVC Check Box

Introduction

ASP.NET Core MVC is a web framework developed by Microsoft that allows developers to build modern web applications using the Model-View-Controller (MVC) architectural pattern. Check boxes are commonly used in web forms to allow users to select one or more options from a list of choices. In this tutorial, we will explore how to create check boxes in an ASP.NET Core MVC application using C#.

Prerequisites

To follow along with this tutorial, you should have a basic understanding of C# programming and ASP.NET Core MVC. You will also need to have the following tools installed on your machine:

• .NET Core SDK
• Visual Studio or Visual Studio Code (with C# extension)

Creating a New ASP.NET Core MVC Project

First, let's create a new ASP.NET Core MVC project. Open Visual Studio and select "Create a New Project". Choose "ASP.NET Core Web Application" and give your project a name. Select "Web Application (Model-View-Controller)" as the project template and click "Create".

Adding a Check Box to a View

To add a check box to our view, we will use the built-in HTML helper method Html.CheckBoxFor(). Open the view where you want to add the check box and add the following code:

@model MyViewModel

<label>
    @Html.CheckBoxFor(m => m.IsSelected)
    @Model.Name
</label>

This code will create a label element with a check box and the name of the item we want to display. The Html.CheckBoxFor() method takes a lambda expression that specifies the property on our model that we want to bind to the check box. In this example, we're binding to the IsSelected property.

Handling Check Box Values in a Controller

When the user submits the form, the values of the check boxes will be sent to the server in the form of a form collection. We can access this collection in our controller method by using the IFormCollection object. Here's an example of how to handle check box values in a controller:

[HttpPost]
public IActionResult MyAction(MyViewModel viewModel)
{
    var selectedItems = viewModel.Items.Where(x => x.IsSelected).ToList();
    // Do something with the selected items
    return RedirectToAction("Index");
}

In this example, we're binding our view model to the controller method and accessing the Items property, which is a collection of items that have a boolean IsSelected property. We're then using LINQ to filter out the selected items and do something with them, such as storing them in a database or sending them in an email.

Conclusion

In this tutorial, we learned how to create check boxes in an ASP.NET Core MVC application using C#. We also saw how to handle check box values in a controller and use LINQ to filter out the selected items. Feel free to experiment with different HTML helper methods and customize your check boxes to fit your application's needs.