33 lines
1.4 KiB
Markdown
33 lines
1.4 KiB
Markdown
---
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title: "MVC1000: Avoid using IHtmlHelper.Partial"
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description: "Learn about analysis rule MVC1000: Use of IHtmlHelper.Partial should be avoided"
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author: pranavkm
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monikerRange: '>= aspnetcore-3.1'
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ms.author: riande
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ms.date: 10/21/2021
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uid: diagnostics/mvc1000
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---
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# MVC1000: Use of IHtmlHelper.Partial should be avoided
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| **Rule ID** |MVC1000|
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| **Fix is breaking or non-breaking** |Non-breaking|
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## Cause
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The <xref:Microsoft.AspNetCore.Mvc.Rendering.HtmlHelperPartialExtensions.Partial%2A> or <xref:Microsoft.AspNetCore.Mvc.Rendering.HtmlHelperPartialExtensions.RenderPartial%2A> method was called or referenced.
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### Rule description
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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.
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## How to fix violations
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- Use the <xref:Microsoft.AspNetCore.Mvc.TagHelpers.PartialTagHelper>
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- Use the <xref:Microsoft.AspNetCore.Mvc.Rendering.HtmlHelperPartialExtensions.PartialAsync%2A> or <xref:Microsoft.AspNetCore.Mvc.Rendering.HtmlHelperPartialExtensions.RenderPartialAsync%2A>
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## When to suppress warnings
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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.
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