How Can I Use the Select Tag Helper in ASP.NET Core MVC to Create Dropdown Lists?

ASP.NET CORE MVC's Select Tag Helper: Easily create a drop -down list

Overview

SELECT TAG Helper provides a simple way to create elements (drop -down list) in the ASP.NET Core MVC view using model data.

Binded to the option set <select>

Assume that the view model contains a attribute and a list of employees stored in attributes:

EmployeeId In the view, you can use Select Tag Helper to bind the options to EmployeesList collection:

<code class="language-csharp">public class MyViewModel
{
    public int EmployeeId { get; set; }
    public List<Employee> EmployeesList { get; set; }
}</code>

The option list displayed in the drop -down list of the attribute. EmployeesList The method is used to sort the list according to the attribute.

<code class="language-html"><select asp-for="EmployeeId" asp-items="@Model.EmployeesList.OrderBy(e => e.FullName)"></select></code>

Set the selection value

asp-items OrderBy The attribute specification will be selected from the drop -down list to the attributes in the view model. In this example, it is : FullName

When submitting the form, the selected value will be automatically bound to the property of the view model.

Use Selectlist

asp-for EmployeeId If your view model has

attributes, you can directly use it to

<code class="language-html"><select asp-for="EmployeeId" asp-items="@Model.EmployeesList.OrderBy(e => e.FullName)"></select></code>

attribute:

EmployeeId

More options

Multi -choice: List uses the array type for the asp-items attribute to enable multiple choices.

<code class="language-csharp">public class MyViewModel
{
    public int EmployeeId { get; set; }
    public List<Employee> Employees { get; set; }
}</code>

Grouping:

<code class="language-html"><select asp-for="EmployeeId" asp-items="@Model.Employees"></select></code>

Specify the

attribute of each to group the options in the drop -down list.

ViewBag:

You can use
• to dynamically pass the option list to the view: asp-for

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