33 lines
1007 B
Markdown
33 lines
1007 B
Markdown
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---
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title: "ASP0020: Complex types referenced by route parameters must be parsable"
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description: "Learn about analysis rule ASP0020: Complex types referenced by route parameters must be parsable."
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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: 03/24/2023
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uid: diagnostics/asp0020
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---
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# ASP0020: Complex types referenced by route parameters must be parsable
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| | Value |
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| **Rule ID** |ASP0020|
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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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A route parameter is a complex type that isn't parsable.
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## Rule description
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This diagnostic is emitted when a route parameter is a complex type that isn't parsable.
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## How to fix violations
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To fix a violation of this rule, define a `bool TryParse(string, IFormatProvider, out T)` method, where `T` is the complex type identified in the error message. As an alternative, implement <xref:System.IParsable%601>.
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## When to suppress warnings
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Do not suppress a warning from this rule.
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