{"record":{"id":"7cd84191a2d872dc","repo":"dotnet/aspnetcore","slug":"there-are-no-content-providers-with-the-given-sect","errorCode":null,"errorMessage":"There are no content providers with the given section ID '{identifier}'.","messagePattern":"There are no content providers with the given section ID '(.+?)'\\.","errorType":"exception","errorClass":"InvalidOperationException","httpStatus":null,"severity":"error","filePath":"src/Components/Components/src/Sections/SectionRegistry.cs","lineNumber":39,"sourceCode":"            providers = new();\n            _providersByIdentifier.Add(identifier, providers);\n        }\n\n        if (isDefaultProvider)\n        {\n            providers.Insert(0, provider);\n        }\n        else\n        {\n            providers.Add(provider);\n        }\n    }\n\n    public void RemoveProvider(object identifier, SectionContent provider)\n    {\n        if (!_providersByIdentifier.TryGetValue(identifier, out var providers))\n        {\n            throw new InvalidOperationException($\"There are no content providers with the given section ID '{identifier}'.\");\n        }\n\n        var index = providers.LastIndexOf(provider);\n\n        if (index < 0)\n        {\n            throw new InvalidOperationException($\"The provider was not found in the providers list of the given section ID '{identifier}'.\");\n        }\n\n        providers.RemoveAt(index);\n\n        if (index == providers.Count)\n        {\n            // We just removed the most recently added provider, meaning we need to change\n            // the current content to that of second most recently added provider.\n            var contentProvider = GetCurrentProviderContentOrDefault(providers);\n            NotifyContentChangedForSubscriber(identifier, contentProvider);\n","sourceCodeStart":21,"sourceCodeEnd":57,"githubUrl":"https://github.com/dotnet/aspnetcore/blob/3600ca084e9c8b5f4174fc5e747f4c52d2100806/src/Components/Components/src/Sections/SectionRegistry.cs#L21-L57","documentation":"Thrown by Blazor's internal SectionRegistry.RemoveProvider when SectionContent.Dispose (or a SectionId change on SectionContent) tries to unregister a provider for a section identifier that has no entry in _providersByIdentifier. It signals an unbalanced AddProvider/RemoveProvider pairing in the component lifecycle. The registry is keyed by the SectionName/SectionId object, so a missing key means that identifier was never registered, or was already removed.","triggerScenarios":"SectionContent.SetParametersAsync calls _registry.RemoveProvider(_registeredIdentifier, this) when the identifier changed, or SectionContent.Dispose calls it on teardown. The throw fires only when _providersByIdentifier has no list for that identifier — i.e. RemoveProvider was invoked without a preceding AddProvider, or the same identifier was already removed (double-dispose).","commonSituations":"Disposing a SectionContent instance whose AddProvider never ran (e.g. SetParametersAsync threw before line 78), calling Dispose twice on the same SectionContent, mutating SectionId from a background thread while a render is mid-flight, or a custom host that drives SectionContent outside the normal component lifecycle.","solutions":["Confirm SectionContent is rendered through the standard Blazor component lifecycle (not instantiated/disposed manually) so AddProvider always precedes RemoveProvider.","Make sure Dispose is idempotent in your own code — do not call Dispose on the same SectionContent from two paths (e.g. a using block plus an explicit Dispose).","Avoid mutating SectionName/SectionId from a non-UI thread; route identifier changes through ComponentState so SetParametersAsync runs the Add→Remove pair atomically.","If you have a custom SectionContent subclass or a host that calls into the registry directly, audit every AddProvider/RemoveProvider call site to ensure they are symmetric per identifier."],"exampleFix":"// before: double dispose path\n_sectionA?.Dispose();\n_sectionA?.Dispose(); // second call throws [340]\n\n// after: guard the dispose\nif (_sectionA is { } s && Interlocked.Exchange(ref _sectionA, null) is not null) s.Dispose();","handlingStrategy":"validation","validationCode":"// Before rendering, assert each SectionContent's identifier was AddProvider'd\n// by routing all SectionContent usage through the standard component lifecycle.\n// In tests, walk the render tree and confirm every SectionContent has a non-null\n// SectionName or SectionId and that the registry has a matching provider list:\n// foreach (var (id, list) in registryProviders) Console.WriteLine($\"{id}: {list.Count}\");","typeGuard":"// C#: SectionContent is sealed; you cannot subclass. The actionable guard is on identifiers.\nstatic bool IsValidSectionIdentifier(object? id) => id is string { Length: > 0 } s || (id is not null && !id.Equals(string.Empty));","tryCatchPattern":null,"preventionTips":["Never call SectionRegistry methods directly from app code; rely on SectionContent/SectionOutlet.","Treat SectionContent.Dispose as renderer-owned — do not double-dispose.","Keep SectionId/SectionName immutable after first render, or use @key to force clean re-instantiation on change."],"tags":["blazor","components","sections","lifecycle","invalidoperation"],"backgroundTag":null,"analyzedSha":"3600ca084e9c8b5f4174fc5e747f4c52d2100806","analyzedAt":"2026-08-11T16:32:30.678Z","contentChangedAt":null,"schemaVersion":2},"datasetVersion":"2026-09-14T00:17:10.932Z"}