Keywords
View
ViewData | ViewBag | TempData | @page | @model
@addTagHelper | @removeTagHelper | @Html.AntiForgeryToken()
RenderBody | RenderSection
Html.BeginForm("<Action>", "<Controller>")
Html.RenderPartialAsync("<Name of file with extension .cshtml>")
Html.DisplayNameFor(model => model.ReleaseDate)
Html.DisplayFor(model => model.Title)
Model
ViewData | ViewBag | TempData | View() | Page()
IActionResult | ModelState | RedirectToPage
Data Annotation
Reference: https://dev.to/ssmak/test-2fl0
[BindProperty] | [BindProperty(Name = "Name123")] | [BindProperty(SupportsGet = true)]
[Key] | [DisplayName] | [Column] | [StringLength], [Range], [RegularExpression]
[HttpPost] | [ValidateAntiForgeryToken]
Tag Helper
Reference: https://docs.microsoft.com/en-us/aspnet/core/mvc/views/tag-helpers/built-in/?view=aspnetcore-3.1
asp-page | asp-page-handler | asp-route-<> | asp-action | asp-controller
asp-for | asp-items
/*
Use with <div>
e.g.
<div asp-validation-summary="All">
<span>Please correct the following errors</span>
</div>
*/
asp-validation-summary
/*
Use with <span>
e.g
<span asp-validation-for="FirstName" class="myclass"></span>
*/
asp-validation-for
/*
Import partial view
*/
<partial name="_MenuPartial" />
/*
Import view component
*/
<vc:priority-list max-priority="2" is-done="false">
</vc:priority-list>
Html Helper
Html.DisplayNameFor | Html.DisplayFor | Html.RenderPartialAsync
Html.Partial
Code References
Form validation
<!-- asp-validation-summary, asp-for, asp-validation-for -->
<form method="post">
<div asp-validation-summary="ModelOnly" class="text-danger"></div>
<input type="hidden" asp-for="Products.ProductId" />
<div class="form-group">
<label asp-for="Products.ProductName" class="control-label"></label>
<input asp-for="Products.ProductName" class="form-control" />
<span asp-validation-for="Products.ProductName" class="text-danger"></span>
</div>
</form>
Import external JavaScript file
@* @section, Scripts, Html.RenderPartialAsync *@
@section Scripts {
@{await Html.RenderPartialAsync("_ValidationScriptsPartial");}
}
Custom tag helper
public class EmailTagHelper : TagHelper
{
private const string EmailDomain = "contoso.com";
// Can be passed via <email mail-to="..." />.
// Pascal case gets translated into lower-kebab-case.
public string MailTo { get; set; }
public override void Process(TagHelperContext context, TagHelperOutput output)
{
output.TagName = "a"; // Replaces <email> with <a> tag
var address = MailTo + "@" + EmailDomain;
output.Attributes.SetAttribute("href", "mailto:" + address);
output.Content.SetContent(address);
}
}
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