aspnetcore/docs/list-of-diagnostics.md

List of Diagnostics Produced by ASP.NET Libraries APIs

Analyzer Warnings

ASP (ASP0000-ASP0024)

Diagnostic ID	Description
ASP0000	Do not call 'IServiceCollection.BuildServiceProvider' in 'ConfigureServices'
ASP0001	Authorization middleware is incorrectly configured
ASP0003	Do not use model binding attributes with route handlers
ASP0004	Do not use action results with route handlers
ASP0005	Do not place attribute on method called by route handler lambda
ASP0006	Do not use non-literal sequence numbers
ASP0007	Route parameter and argument optionality is mismatched
ASP0008	Do not use ConfigureWebHost with WebApplicationBuilder.Host
ASP0009	Do not use Configure with WebApplicationBuilder.WebHost
ASP0010	Do not use UseStartup with WebApplicationBuilder.WebHost
ASP0011	Suggest using builder.Logging over Host.ConfigureLogging or WebHost.ConfigureLogging
ASP0012	Suggest using builder.Services over Host.ConfigureServices or WebHost.ConfigureServices
ASP0013	Suggest switching from using Configure methods to WebApplicationBuilder.Configuration
ASP0014	Suggest using top level route registrations
ASP0015	Suggest using IHeaderDictionary properties
ASP0016	Do not return a value from RequestDelegate
ASP0017	Invalid route pattern
ASP0018	Unused route parameter
ASP0019	Suggest using IHeaderDictionary.Append or the indexer
ASP0020	Complex types referenced by route parameters must be parsable
ASP0021	When implementing BindAsync(...) method, the return type must be ValueTask<T>
ASP0022	Route conflict detected between route handlers
ASP0023	Route conflict detected between controller actions
ASP0024	Route handler has multiple parameters with the [FromBody] attribute

API (API1000-API1003)

Diagnostic ID	Description
API1000	Action returns undeclared status code
API1001	Action returns undeclared success result
API1002	Action documents status code that is not returned
API1003	Action methods on ApiController instances do not require explicit model validation check

MVC (MVC1000 - MVC1006)

Diagnostic ID	Description
MVC1000	Use of IHtmlHelper.{0} should be avoided
MVC1001	Filters cannot be applied to page handler methods
MVC1002	Route attributes cannot be applied to page handler methods
MVC1003	Route attributes cannot be applied to page models
MVC1004	Rename model bound parameter
MVC1005	Cannot use UseMvc with Endpoint Routing
MVC1006	Methods containing TagHelpers must be async and return Task

BL (BL0001-BL0007)

Diagnostic ID	Description
BL0001	Component parameter should have public setters
BL0002	Component has multiple CaptureUnmatchedValues parameters
BL0003	Component parameter with CaptureUnmatchedValues has the wrong type
BL0004	Component parameter should be public
BL0005	Component parameter should not be set outside of its component
BL0006	Do not use RenderTree types
BL0007	Component parameters should be auto properties

Request Delegate Generator (RDG001-RDG004)

Diagnostic ID	Description
RDG001	Unable to resolve route pattern
RDG002	Unable to resolve endpoint handler
RDG003	Unable to resolve parameter
RDG004	Unable to resolve anonymous type
RDG005	Invalid abstract type
RDG006	Invalid constructor parameters
RDG007	No valid constructor found
RDG008	Multiple public constructors found
RDG009	Invalid nested AsParameters
RDG010	Unexpected nullable type

SignalR Source Generator (SSG0000-SSG0110)

Diagnostic ID	Description
SSG0000	Non-interface generic type argument
SSG0001	Unsupported return type
SSG0002	Too many HubServerProxy attributed methods
SSG0003	HubServerProxy attributed method has bad accessibility
SSG0004	HubServerProxy attributed method is not partial
SSG0005	HubServerProxy attributed method is not an extension method
SSG0006	HubServerProxy attributed method has bad number of type arguments
SSG0007	HubServerProxy attributed method type argument and return type does not match
SSG0008	HubServerProxy attributed method has bad number of arguments
SSG0009	HubServerProxy attributed method has argument of wrong type
SSG0100	Unsupported return type
SSG0102	Too many HubClientProxy attributed methods
SSG0103	HubClientProxy attributed method has bad accessibility
SSG0104	HubClientProxy attributed method is not partial
SSG0105	HubClientProxy attributed method is not an extension method
SSG0106	HubClientProxy attributed method has bad number of type arguments
SSG0107	HubClientProxy attributed method type argument and return type does not match
SSG0108	HubClientProxy attributed method has bad number of arguments
SSG0109	HubClientProxy attributed method has first argument of wrong type
SSG0110	HubClientProxy attributed method has wrong return type