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title MVC1000: Avoid using IHtmlHelper.Partial
description Learn about analysis rule MVC1000: Use of IHtmlHelper.Partial should be avoided
author pranavkm
monikerRange >= aspnetcore-3.1
ms.author riande
ms.date 10/21/2021
uid diagnostics/mvc1000

MVC1000: Use of IHtmlHelper.Partial should be avoided

Value
Rule ID MVC1000
Fix is breaking or non-breaking Non-breaking

Cause

The xref:Microsoft.AspNetCore.Mvc.Rendering.HtmlHelperPartialExtensions.Partial%2A or xref:Microsoft.AspNetCore.Mvc.Rendering.HtmlHelperPartialExtensions.RenderPartial%2A method was called or referenced.

Rule description

Rendering a partial using IHtmlHelper.Partial or IHtmlHelper.RenderPartial extension methods results in blocking calls. This may result in performance degradation and application dead locks issues due to thread pool starvation.

How to fix violations

  • Use the xref:Microsoft.AspNetCore.Mvc.TagHelpers.PartialTagHelper
  • Use the xref:Microsoft.AspNetCore.Mvc.Rendering.HtmlHelperPartialExtensions.PartialAsync%2A or xref:Microsoft.AspNetCore.Mvc.Rendering.HtmlHelperPartialExtensions.RenderPartialAsync%2A

When to suppress warnings

It's safe to suppress this rule if updating the application to use the suggested fixes is non-trivial. Before the validation is disabled, be sure to consider the risks of thread pool starvation to the application.