AspNetCore.Docs/aspnetcore/diagnostics/mvc1006.md

title	description	author	monikerRange	ms.author	ms.date	no-loc	uid
MVC1006: Methods containing TagHelpers must be async and return Task	Learn about analysis rule MVC1006: Methods containing TagHelpers must be async and return Task	pranavkm	>= aspnetcore-3.1	riande	10/22/2021	Home Privacy Kestrel appsettings.json ASP.NET Core Identity cookie Cookie Blazor Blazor Server Blazor WebAssembly Identity Let's Encrypt Razor SignalR	diagnostics/mvc1006

MVC1006: Methods containing TagHelpers must be async and return Task

	Value
Rule ID	MVC1006
Fix is breaking or non-breaking	Breaking

Cause

A tag helper was defined inside a Razor function that executes synchronously

Rule description

Tag Helper execution is asynchronous. When used inside a method or a lambda within a Razor Page, the containing function must also be declared to be async.

Consider the following cshtml file:

void Helper(string controller)
{
    <a asp-controller="@controller">Home</a>
}

asp-controller is a tag helper and will trigger this rule.

How to fix violations

Declare the function to be async and Task returning:

async Task Helper(string controller)
{
    <a asp-controller="@controller">Home</a>
}

When to suppress warnings

Do not suppress a warning from this rule.