{"record":{"id":"e2da8a61649fb3d1","repo":"cefsharp/CefSharp","slug":"could-not-execute-method-name-parameters-op","errorCode":null,"errorMessage":"Could not execute method: {name}({parameters}) {optional: - Missing Parameters: {missingParams}}","messagePattern":"Could not execute method: (.+?)\\((.+?)\\) (.+?)\\}","errorType":"exception","errorClass":"InvalidOperationException","httpStatus":null,"severity":"error","filePath":"CefSharp/Internals/JavascriptObjectRepository.cs","lineNumber":386,"sourceCode":"                        {\n                            paramList.Add(Type.Missing);\n                        }\n\n                        parameters = paramList.ToArray();\n                    }\n\n                    if (obj.MethodInterceptor == null)\n                    {\n                        result = method.Function(obj.Value, parameters);\n                    }\n                    else\n                    {\n                        result = obj.MethodInterceptor.Intercept((p) => method.Function(obj.Value, p), parameters, method.ManagedName);\n                    }\n                }\n                catch (Exception e)\n                {\n                    throw new InvalidOperationException(\"Could not execute method: \" + name + \"(\" + String.Join(\", \", parameters) + \") \" + (missingParams > 0 ? \"- Missing Parameters: \" + missingParams : \"\"), e);\n                }\n\n                //For sync binding with methods that return a complex property we create a new JavascriptObject\n                //TODO: Fix the memory leak, every call to a method that returns an object will create a new\n                //JavascriptObject and they are never released\n                if (!obj.IsAsync && result != null && IsComplexType(result.GetType()))\n                {\n                    var jsObject = CreateJavascriptObject(rootObject: false);\n                    jsObject.Value = result;\n                    jsObject.Name = \"FunctionResult(\" + name + \")\";\n                    jsObject.JavascriptName = jsObject.Name;\n\n                    AnalyseObjectForBinding(jsObject, analyseMethods: false, analyseProperties: true, readPropertyValue: true);\n\n                    result = jsObject;\n                }\n\n                return new TryCallMethodResult(true, result, exception); ;","sourceCodeStart":368,"sourceCodeEnd":404,"githubUrl":"https://github.com/cefsharp/CefSharp/blob/16bc6e0711a4945be17e8bc4bc7ccf9469f3fdec/CefSharp/Internals/JavascriptObjectRepository.cs#L368-L404","documentation":"Thrown by the synchronous TryCallMethod path when invoking the bound method (method.Function or its MethodInterceptor) raises any exception. The original exception is wrapped as the InnerException of the InvalidOperationException, and the message records the method name, the joined parameter list, and (if > 0) the count of missing parameters. This is effectively a re-throw with extra context.","triggerScenarios":"The bound C# method throws (NullReferenceException, ArgumentException, business error); parameter conversion/binding fails; the MethodInterceptor raises; too few arguments were supplied (missingParams > 0) causing a downstream failure.","commonSituations":"Method body hits a null ref; invalid arguments from JS; type conversion mismatches between JS values and .NET parameter types; interceptor enforcing a rule and rejecting the call.","solutions":["Inspect the InnerException for the real root cause before the wrap.","Add null/argument validation at the start of the bound method and throw a clear domain exception.","Validate argument counts and types on the JS side before calling.","If using a MethodInterceptor, ensure it does not throw for valid calls."],"exampleFix":"// before\npublic User GetUser(int id) => _users[id]; // IndexOutOfRange if invalid\n\n// after\npublic User GetUser(int id)\n{\n    if (id < 0 || id >= _users.Count)\n        throw new ArgumentException(\"id out of range: \" + id, nameof(id));\n    return _users[id];\n}","handlingStrategy":"try-catch","validationCode":"// Validate argument count/types before calling if your interop layer exposes arity:\nif (parameters == null || parameters.Length < requiredParamCount)\n    throw new ArgumentException(\"Missing parameters for \" + name);","typeGuard":null,"tryCatchPattern":"try { result = repository.TryCallMethod(objectId, name, parameters, out result, out ex); }\ncatch (InvalidOperationException ex) when (ex.Message.StartsWith(\"Could not execute method\"))\n{ var root = ex.InnerException ?? ex; /* surface root cause to caller */ }","preventionTips":["Always inspect InnerException for the real cause.","Validate inputs inside bound methods and throw clear domain exceptions.","Check argument counts on the JS side before invoking."],"tags":["cefsharp","javascript-binding","method-invocation","wrapped-exception","sync"],"backgroundTag":null,"analyzedSha":"16bc6e0711a4945be17e8bc4bc7ccf9469f3fdec","analyzedAt":"2026-08-13T19:57:05.828Z","schemaVersion":2},"datasetVersion":"2026-08-14T00:17:13.853Z"}