RicoSuter/NSwag

The JSON property 'item' is defined multiple times on type 'System.ComponentModel.ComponentCollection'.

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#2,188 opened on May 23, 2019

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Description

I'm use NSwag.AspNetCore in my asp.net core 2.2 project. But when I visit redoc url, I get a error message. The JSON property 'item' is defined multiple times on type 'System.ComponentModel.ComponentCollection'.

The StackTrace is

System.InvalidOperationException: The JSON property 'item' is defined multiple times on type 'System.ComponentModel.ComponentCollection'.
   at NJsonSchema.Generation.JsonSchemaGenerator.LoadPropertyOrFieldAsync(JsonProperty property, MemberInfo propertyInfo, Type parentType, JsonSchema4 parentSchema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GeneratePropertiesAsync(Type type, JsonSchema4 schema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateInheritanceAsync(Type type, JsonSchema4 schema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateObjectAsync(Type type, JsonTypeDescription typeDescription, JsonSchema4 schema, JsonSchemaResolver schemaResolver)
   at NSwag.SwaggerGeneration.SwaggerJsonSchemaGenerator.GenerateObjectAsync(Type type, JsonTypeDescription typeDescription, JsonSchema4 schema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, TSchemaType schema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, JsonSchemaResolver schemaResolver)
   at NSwag.SwaggerGeneration.SwaggerJsonSchemaGenerator.GenerateObjectAsync(Type type, JsonTypeDescription typeDescription, JsonSchema4 schema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, TSchemaType schema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateWithReferenceAndNullabilityAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, Boolean isNullable, JsonSchemaResolver schemaResolver, Func`3 transformation)
   at NSwag.SwaggerGeneration.SwaggerJsonSchemaGenerator.GenerateWithReferenceAndNullabilityAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, Boolean isNullable, JsonSchemaResolver schemaResolver, Func`3 transformation)
   at NJsonSchema.Generation.JsonSchemaGenerator.LoadPropertyOrFieldAsync(JsonProperty property, MemberInfo propertyInfo, Type parentType, JsonSchema4 parentSchema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GeneratePropertiesAsync(Type type, JsonSchema4 schema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateObjectAsync(Type type, JsonTypeDescription typeDescription, JsonSchema4 schema, JsonSchemaResolver schemaResolver)
   at NSwag.SwaggerGeneration.SwaggerJsonSchemaGenerator.GenerateObjectAsync(Type type, JsonTypeDescription typeDescription, JsonSchema4 schema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, TSchemaType schema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, JsonSchemaResolver schemaResolver)
   at NSwag.SwaggerGeneration.SwaggerJsonSchemaGenerator.GenerateObjectAsync(Type type, JsonTypeDescription typeDescription, JsonSchema4 schema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, TSchemaType schema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateWithReferenceAndNullabilityAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, Boolean isNullable, JsonSchemaResolver schemaResolver, Func`3 transformation)
   at NSwag.SwaggerGeneration.SwaggerJsonSchemaGenerator.GenerateWithReferenceAndNullabilityAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, Boolean isNullable, JsonSchemaResolver schemaResolver, Func`3 transformation)
   at NJsonSchema.Generation.JsonSchemaGenerator.LoadPropertyOrFieldAsync(JsonProperty property, MemberInfo propertyInfo, Type parentType, JsonSchema4 parentSchema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GeneratePropertiesAsync(Type type, JsonSchema4 schema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateObjectAsync(Type type, JsonTypeDescription typeDescription, JsonSchema4 schema, JsonSchemaResolver schemaResolver)
   at NSwag.SwaggerGeneration.SwaggerJsonSchemaGenerator.GenerateObjectAsync(Type type, JsonTypeDescription typeDescription, JsonSchema4 schema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, TSchemaType schema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, JsonSchemaResolver schemaResolver)
   at NSwag.SwaggerGeneration.SwaggerJsonSchemaGenerator.GenerateObjectAsync(Type type, JsonTypeDescription typeDescription, JsonSchema4 schema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, TSchemaType schema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateWithReferenceAndNullabilityAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, Boolean isNullable, JsonSchemaResolver schemaResolver, Func`3 transformation)
   at NSwag.SwaggerGeneration.SwaggerJsonSchemaGenerator.GenerateWithReferenceAndNullabilityAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, Boolean isNullable, JsonSchemaResolver schemaResolver, Func`3 transformation)
   at NJsonSchema.Generation.JsonSchemaGenerator.LoadPropertyOrFieldAsync(JsonProperty property, MemberInfo propertyInfo, Type parentType, JsonSchema4 parentSchema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GeneratePropertiesAsync(Type type, JsonSchema4 schema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateInheritanceAsync(Type type, JsonSchema4 schema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateObjectAsync(Type type, JsonTypeDescription typeDescription, JsonSchema4 schema, JsonSchemaResolver schemaResolver)
   at NSwag.SwaggerGeneration.SwaggerJsonSchemaGenerator.GenerateObjectAsync(Type type, JsonTypeDescription typeDescription, JsonSchema4 schema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, TSchemaType schema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, JsonSchemaResolver schemaResolver)
   at NSwag.SwaggerGeneration.SwaggerJsonSchemaGenerator.GenerateObjectAsync(Type type, JsonTypeDescription typeDescription, JsonSchema4 schema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, TSchemaType schema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateWithReferenceAndNullabilityAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, Boolean isNullable, JsonSchemaResolver schemaResolver, Func`3 transformation)
   at NSwag.SwaggerGeneration.SwaggerJsonSchemaGenerator.GenerateWithReferenceAndNullabilityAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, Boolean isNullable, JsonSchemaResolver schemaResolver, Func`3 transformation)
   at NJsonSchema.Generation.JsonSchemaGenerator.LoadPropertyOrFieldAsync(JsonProperty property, MemberInfo propertyInfo, Type parentType, JsonSchema4 parentSchema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GeneratePropertiesAsync(Type type, JsonSchema4 schema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateObjectAsync(Type type, JsonTypeDescription typeDescription, JsonSchema4 schema, JsonSchemaResolver schemaResolver)
   at NSwag.SwaggerGeneration.SwaggerJsonSchemaGenerator.GenerateObjectAsync(Type type, JsonTypeDescription typeDescription, JsonSchema4 schema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, TSchemaType schema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, JsonSchemaResolver schemaResolver)
   at NSwag.SwaggerGeneration.SwaggerJsonSchemaGenerator.GenerateObjectAsync(Type type, JsonTypeDescription typeDescription, JsonSchema4 schema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, TSchemaType schema, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, JsonSchemaResolver schemaResolver)
   at NJsonSchema.Generation.JsonSchemaGenerator.GenerateWithReferenceAndNullabilityAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, Boolean isNullable, JsonSchemaResolver schemaResolver, Func`3 transformation)
   at NSwag.SwaggerGeneration.SwaggerJsonSchemaGenerator.GenerateWithReferenceAndNullabilityAsync[TSchemaType](Type type, IEnumerable`1 parentAttributes, Boolean isNullable, JsonSchemaResolver schemaResolver, Func`3 transformation)
   at NSwag.SwaggerGeneration.AspNetCore.Processors.OperationResponseProcessor.ProcessAsync(OperationProcessorContext operationProcessorContext)
   at NSwag.SwaggerGeneration.AspNetCore.AspNetCoreToSwaggerGenerator.RunOperationProcessorsAsync(SwaggerDocument document, ApiDescription apiDescription, Type controllerType, MethodInfo methodInfo, SwaggerOperationDescription operationDescription, List`1 allOperations, SwaggerGenerator swaggerGenerator, SwaggerSchemaResolver schemaResolver)
   at NSwag.SwaggerGeneration.AspNetCore.AspNetCoreToSwaggerGenerator.AddOperationDescriptionsToDocumentAsync(SwaggerDocument document, Type controllerType, List`1 operations, SwaggerGenerator swaggerGenerator, SwaggerSchemaResolver schemaResolver)
   at NSwag.SwaggerGeneration.AspNetCore.AspNetCoreToSwaggerGenerator.GenerateForControllersAsync(SwaggerDocument document, IGrouping`2[] apiGroups, SwaggerSchemaResolver schemaResolver)
   at NSwag.SwaggerGeneration.AspNetCore.AspNetCoreToSwaggerGenerator.GenerateAsync(ApiDescriptionGroupCollection apiDescriptionGroups)
   at NSwag.SwaggerGeneration.AspNetCore.AspNetCoreToSwaggerGenerator.GenerateAsync(Object serviceProvider)
   at NSwag.AspNetCore.SwaggerDocumentProvider.GenerateAsync(String documentName)
   at NSwag.AspNetCore.Middlewares.SwaggerDocumentMiddleware.GenerateDocumentAsync(HttpContext context)
   at NSwag.AspNetCore.Middlewares.SwaggerDocumentMiddleware.GetDocumentAsync(HttpContext context)
   at NSwag.AspNetCore.Middlewares.SwaggerDocumentMiddleware.Invoke(HttpContext context)
   at IdentityServer4.Hosting.IdentityServerMiddleware.Invoke(HttpContext context, IEndpointRouter router, IUserSession session, IEventService events) in C:\local\identity\server4\IdentityServer4\src\Hosting\IdentityServerMiddleware.cs:line 72
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
   at IdentityServer4.Hosting.BaseUrlMiddleware.Invoke(HttpContext context) in C:\local\identity\server4\IdentityServer4\src\Hosting\BaseUrlMiddleware.cs:line 36
   at Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.Invoke(HttpContext context)
   at DataExplorer.Server.Middleware.CustomExceptionHandlerMiddleware.Invoke(HttpContext context) in E:\Source\Repos\DataExplorer\server\DataExplorer.Server\Middleware\CustomExceptionHandlerMiddleware.cs:line 52

Contributor guide

Research direction
Investigate the System.ComponentModel.ComponentCollection type to understand why the JSON property 'item' is defined multiple times. Check the inheritance hierarchy and any explicit interface implementations that might cause duplication. Look at the NJsonSchema generator's handling of properties from interfaces and base classes.
Tech stack
csharp
Domain
backendapi
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
.NETASP.NET CoreNSwag
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60