{"record":{"id":"f7c17fc01a0effe4","repo":"stride3d/stride","slug":"property-path-parse-error-could-not-find-binding-info-for","errorCode":null,"errorMessage":"Property path parse error: could not find binding info for index {0} in type {1}","messagePattern":"Property path parse error: could not find binding info for index (.+?) in type (.+?)","errorType":"validation","errorClass":"InvalidOperationException","httpStatus":null,"severity":"error","filePath":"sources/engine/Stride.Engine/Updater/UpdateEngine.cs","lineNumber":232,"sourceCode":"\n                        // Try interfaces\n                        if (updatableMember == null)\n                        {\n                            foreach (var implementedInterface in containerType.GetTypeInfo().ImplementedInterfaces)\n                            {\n                                UpdateMemberResolver resolver;\n                                if (MemberResolvers.TryGetValue(implementedInterface, out resolver))\n                                {\n                                    updatableMember = resolver.ResolveIndexer(indexerString);\n                                    if (updatableMember != null)\n                                        break;\n                                }\n                            }\n                        }\n\n                        if (updatableMember == null)\n                        {\n                            throw new InvalidOperationException(string.Format(\"Property path parse error: could not find binding info for index {0} in type {1}\", indexerString, containerType));\n                        }\n\n                        ProcessMember(ref state, animationPath, updatableMember, temporaryObjectsList);\n                    }\n                    else\n                    {\n                        // Note: first character might be a . delimiter, if so, skip it\n                        var propertyStart = state.ParseElementStart;\n                        if (animationPath.Name[propertyStart] == PathDelimiter)\n                            propertyStart++;\n\n                        // Check if it started with a parenthesis (to perform a cast operation)\n                        if (animationPath.Name[propertyStart] == PathCastOpen)\n                        {\n                            // Parse until end of cast operation\n                            state.ParseElementEnd = animationPath.Name.IndexOf(PathCastClose, ++propertyStart);\n                            if (state.ParseElementEnd == -1)\n                                throw new InvalidOperationException(\"Property path parse error: could not find cast operation ending ')'\");","sourceCodeStart":214,"sourceCodeEnd":250,"githubUrl":"https://github.com/stride3d/stride/blob/96fad776d210c221682aac1ccdf4c79dc046fc38/sources/engine/Stride.Engine/Updater/UpdateEngine.cs#L214-L250","documentation":"During UpdateEngine.Compile, after parsing an indexer value, the engine looks up the corresponding binding/accessor metadata on the container type. If no updatable member (binding info) is found for that index, it throws InvalidOperationException — meaning the numeric index cannot be resolved against the actual runtime type (e.g. index out of range or the member isn't indexable).","triggerScenarios":"Compiling a path like 'Items[5]' where the container type has no accessible indexer binding for 5 — the member is not an array/list, the type lacks the expected accessor metadata, or the compiled path element mismatches the real object graph (static type vs runtime type mismatch).","commonSituations":"Animation targeting a member that changed type between versions (array -> dictionary or plain field); paths built against one entity type but applied to another; indices beyond collection bounds surfaced as missing binding info; using paths on structs/types without registered updatable members.","solutions":["Verify the property path matches the actual type graph: correct member name, correct element type, and a valid index within bounds.","Ensure the target type is public and its array/list member is accessible to the updater (Blittable/Serializable as required).","Rebuild or fix the path after any schema/refactor change; re-export animations targeting renamed/retyped members.","Catch InvalidOperationException from Compile and report the container type + index to diagnose which member is unbindable."],"exampleFix":"// before\nvar path = \"Keyframes[10]\"; // Keyframes is a Dictionary, not an array\n// after\nvar path = \"KeyframeList[10]\"; // bind to the array/list member","handlingStrategy":"try-catch","validationCode":"bool canBind(object target, string member, int index) { var p = target.GetType().GetProperty(member); return p != null && (p.PropertyType.IsArray || (p.PropertyType.IsGenericType && p.PropertyType.GetGenericTypeDefinition() == typeof(List<>))); }","typeGuard":null,"tryCatchPattern":"try { engine.Compile(target, path, out attrs, out blittables, out updatables); } catch (InvalidOperationException ex) when (ex.Message.Contains(\"binding info\")) { log.Error($\"Path {path} does not match type {target.GetType()}: {ex.Message}\"); }","preventionTips":["Keep property paths in sync with the actual type graph","Re-export animations after refactors that rename or retype members","Ensure indexed members are arrays/lists with valid in-range indices","Make target types public/serializable so the updater can register accessors"],"tags":["property-path","binding","animation"],"backgroundTag":"invalid-argument-value","analyzedSha":"96fad776d210c221682aac1ccdf4c79dc046fc38","analyzedAt":"2026-09-14T02:59:31.279Z","contentChangedAt":"2026-09-14T02:59:31.279Z","schemaVersion":2},"datasetVersion":"2026-09-23T08:17:48.524Z"}