{"record":{"id":"21ad7cbe31bbf73b","repo":"stride3d/stride","slug":"could-not-resolve-generic-arguments","errorCode":null,"errorMessage":"Could not resolve generic arguments","messagePattern":"Could not resolve generic arguments","errorType":"exception","errorClass":"InvalidOperationException","httpStatus":null,"severity":"error","filePath":"sources/core/Stride.Core.AssemblyProcessor/DispatcherProcessor.cs","lineNumber":511,"sourceCode":"        {\n            if (genericArgument.IsGenericParameter)\n            {\n                var genericParameter = GetGenericParameterForArgument(relativeType, genericArgument);\n                if (genericParameter != null)\n                {\n                    genericArguments.Add(genericParameter);\n                }\n            }\n            else\n            {\n                var newGenericArgument = ChangeGenericArguments(context, genericArgument, relativeType);\n                genericArguments.Add(newGenericArgument);\n            }\n        }\n\n        if (genericArguments.Count != genericInstance.GenericArguments.Count)\n        {\n            throw new InvalidOperationException(\"Could not resolve generic arguments\");\n        }\n\n        return context.Assembly.MainModule.ImportReference(genericInstance.Resolve()).MakeGenericInstanceType(genericArguments.ToArray());\n    }\n\n    private MethodReference ChangeGenericArguments(AssemblyProcessorContext context, MethodReference method, TypeReference relativeType)\n    {\n        if (method is not GenericInstanceMethod genericInstance)\n            return method.Resolve().MakeGeneric([.. relativeType.Resolve().GenericParameters]);\n\n        Debugger.Launch();\n\n        var genericArguments = new List<TypeReference>();\n        foreach (var genericArgument in genericInstance.GenericArguments)\n        {\n            if (genericArgument.IsGenericParameter)\n            {\n                var genericParameter = GetGenericParameterForArgument(relativeType, genericArgument);","sourceCodeStart":493,"sourceCodeEnd":529,"githubUrl":"https://github.com/stride3d/stride/blob/96fad776d210c221682aac1ccdf4c79dc046fc38/sources/core/Stride.Core.AssemblyProcessor/DispatcherProcessor.cs#L493-L529","documentation":"DispatcherProcessor (IL weaver for generic dispatchers) rebuilds a GenericInstanceType by mapping each generic argument; when the rebuilt argument list has fewer entries than the original generic instance, it throws this InvalidOperationException because the generic type could not be fully closed.","triggerScenarios":"AssemblyProcessor scanning an assembly containing a generic instance type whose arguments cannot all be mapped to concrete types in the processing context, during dispatcher method generation.","commonSituations":"Using generic types/methods over types the processor cannot resolve (e.g. deeply nested or externally defined generics); assemblies compiled with generic patterns the weaver did not anticipate; mixing assemblies compiled against different Stride versions.","solutions":["Identify the generic type in your code that fails to close and simplify it (use a non-generic or fully closed type)","Ensure all referenced assemblies containing the generic arguments are available and built with a compatible Stride version","Rebuild clean (delete bin/obj) so the processed assembly matches current sources","If a specific API pattern triggers it, avoid that generic pattern or report it as an AssemblyProcessor bug"],"exampleFix":"// before\nclass Dispatcher<T> : IMyDispatcher where T : struct { ... }\n// after (close the generic explicitly in usage)\nvar d = new Dispatcher<MyStruct>(); // fully closed instantiation the processor can resolve","handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":"// build-time error; wrap assembly processing in the build task\ncatch (InvalidOperationException ex) when (ex.Message == \"Could not resolve generic arguments\")\n{\n    // identify offending generic type, make instantiation closed\n}","preventionTips":["Prefer closed generic instantiations in code processed by AssemblyProcessor","Clean rebuild after Stride upgrades","Keep all referenced assemblies available to the processor"],"tags":["il-weaving","generics","assemblyprocessor","build"],"backgroundTag":"internal-invariant-violation","analyzedSha":"96fad776d210c221682aac1ccdf4c79dc046fc38","analyzedAt":"2026-09-14T02:59:31.279Z","contentChangedAt":"2026-09-14T02:59:31.279Z","schemaVersion":2},"datasetVersion":"2026-09-15T23:17:13.987Z"}