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Layout View

The Views/Shared/_Layout.cshtml is the mother of all pages

Partial Views

  • A partial view is a .cshtml markup file without an @page directive maintained within the Views folder (MVC) or Pages folder (Razor Pages)

  • ASP.NET will look at the below path for resolving a partial view:

    • Razor Pages

      1. Currently executing page's folder
      2. Directory graph above the page's folder
      3. /Shared
      4. /Pages/Shared
      5. /Views/Shared

    • MVC

      1. /Areas/<Area-Name>/Views/<Controller-Name>
      2. /Areas/<Area-Name>/Views/Shared
      3. /Views/Shared
      4. /Pages/Shared

  • Name of them should start with _

  • Simply with the below syntax we can import them inside of the other pages:

    <partial name="_PartialName" />

View Model

At the top of each .html file, we should have a @model tag, this tag will point into the ViewModel of the HTML file, like the below code:

@model BulkyBook.Models.ViewModels.ProductVM

For this tag we can easily pass the Entity model, or for the complex scenarios, we can create a custom ViewModel like the below:

public class ProductVM {
    public Product Product { get; set; }
    public IEnumerable<SelectListItem> CategoryList { get; set; }
    public IEnumerable<SelectListItem> CoverTypeList { get; set; }
}

Tag Helpers

  • Tag Helpers are introduced with ASP.NET Core.
  • Tag Helpers enable server-side code to participate in creating and rendering HTML elements in Razor files.
  • Tag Helpers are very focused around the html elements and much more natural to use.
@* -------HTML Helper-------- *@
@Html.Label("FirstName", "FirstName : ", new { @class = "form-control" })

@* -------TAG Helper-------- *@
<label class="form-control" asp-for="FirstName"></label>

@* -------HTML Helper-------- *@
@Html.LabelFor(m=>m.FirstName, new { @class="col-md-2 control-label" })

@* -------TAG Helper-------- *@
<label asp-for="FirstName" class="col-md-2 control-label"></label>

@* -------HTML Helper-------- *@
@using (Html.BeginForm("Index", "Users", FormMethod.Post, new { @class = "form-horizontal" }))
{
}

@* -------TAG Helper-------- *@
<form class="form-horizontal" method="post" asp-controller="Users" asp-action="Index"></form>
<form class="form-horizontal" method="post" asp-page="Users/Index"></form>

View Component

  1. The runtime searches for the view in the following paths:

    • /Views/{Controller Name}/Components/{View Component Name}/{View Name}
    • /Views/Shared/Components/{View Component Name}/{View Name}
    • /Pages/Shared/Components/{View Component Name}/{View Name}

  2. The default view name for a view component is Default, which means view files will typically be named Default.cshtml

  3. Render syntax

    @await Component.InvokeAsync("Name of view component", {Anonymous Type Containing Parameters})