33 lines
1.1 KiB
Markdown
33 lines
1.1 KiB
Markdown
---
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title: "ASP0021: The return type of the BindAsync method must be ValueTask<T>"
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description: "Learn about analysis rule ASP0021: When implementing the BindAsync(...) method, the return type must be ValueTask<T>."
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author: tdykstra
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monikerRange: '>= aspnetcore-8.0'
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ms.author: tdykstra
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ms.date: 03/27/2023
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uid: diagnostics/asp0021
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---
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# ASP0021: The return type of the BindAsync method must be `ValueTask<T>`.
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| **Rule ID** |ASP0021|
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| **Category** |Usage|
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| **Fix is breaking or non-breaking** |Non-breaking|
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## Cause
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An implementation of the <xref:Microsoft.AspNetCore.Http.IBindableFromHttpContext%601.BindAsync%2A> method has a return type that isn't <xref:System.Threading.Tasks.ValueTask%601>.
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## Rule description
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This diagnostic is emitted when an implementation of the `BindAsync` method has a return type that isn't `ValueTask<T>`.
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## How to fix violations
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To fix a violation of this rule, define a `ValueTask<T>` return type for `BindAsync` and consider implementing <xref:Microsoft.AspNetCore.Http.IBindableFromHttpContext%601> to enforce implementation.
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## When to suppress warnings
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Do not suppress a warning from this rule.
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