{"record":{"id":"191e130e10d0ad27","repo":"StockSharp/StockSharp","slug":"parameters-191e13","errorCode":null,"errorMessage":"parameters","messagePattern":"parameters","errorType":"validation","errorClass":"ArgumentOutOfRangeException","httpStatus":null,"severity":"error","filePath":"Algo.Gpu/Indicators/GpuMovingAverageCrossoverCalculator.cs","lineNumber":72,"sourceCode":"\t/// <param name=\"accelerator\">ILGPU accelerator.</param>\n\tpublic GpuMovingAverageCrossoverCalculator(Context context, Accelerator accelerator)\n\t\t: base(context, accelerator)\n\t{\n\t\t_paramsSeriesKernel = Accelerator.LoadAutoGroupedStreamKernel\n\t\t\t<Index3D, ArrayView<GpuCandle>, ArrayView<GpuIndicatorResult>, ArrayView<int>, ArrayView<int>, ArrayView<GpuMovingAverageCrossoverParams>>(MovingAverageCrossoverParamsSeriesKernel);\n\t}\n\n\t/// <inheritdoc />\n\tpublic override GpuIndicatorResult[][][] Calculate(GpuCandle[][] candlesSeries, GpuMovingAverageCrossoverParams[] parameters)\n\t{\n\t\tArgumentNullException.ThrowIfNull(candlesSeries);\n\t\tArgumentNullException.ThrowIfNull(parameters);\n\n\t\tif (candlesSeries.Length == 0)\n\t\t\tthrow new ArgumentOutOfRangeException(nameof(candlesSeries));\n\n\t\tif (parameters.Length == 0)\n\t\t\tthrow new ArgumentOutOfRangeException(nameof(parameters));\n\n\t\tvar seriesCount = candlesSeries.Length;\n\n\t\t// Flatten input\n\t\tvar totalSize = 0;\n\t\tvar seriesOffsets = new int[seriesCount];\n\t\tvar seriesLengths = new int[seriesCount];\n\n\t\tfor (var s = 0; s < seriesCount; s++)\n\t\t{\n\t\t\tseriesOffsets[s] = totalSize;\n\t\t\tvar len = candlesSeries[s]?.Length ?? 0;\n\t\t\tseriesLengths[s] = len;\n\t\t\ttotalSize += len;\n\t\t}\n\n\t\tvar flatCandles = new GpuCandle[totalSize];\n\t\tvar maxLen = 0;","sourceCodeStart":54,"sourceCodeEnd":90,"githubUrl":"https://github.com/StockSharp/StockSharp/blob/601a191de678bff83da28b14828f8885214ca71c/Algo.Gpu/Indicators/GpuMovingAverageCrossoverCalculator.cs#L54-L90","documentation":"GpuMovingAverageCrossoverCalculator.Calculate throws ArgumentOutOfRangeException when the parameters array (GpuMovingAverageCrossoverParams[]) is empty. The method iterates over parameters to compute fast/slow MA crossover signals for each set; an empty array means nothing to compute and would produce a misleading empty result.","triggerScenarios":"Calling Calculate with Array.Empty<GpuMovingAverageCrossoverParams>() or a zero-length parameters array as the second argument.","commonSituations":"Parameter optimization grid filtered out all fast/slow period combinations; config deserialization yielded an empty list; dynamic parameter builder has a bug producing zero entries.","solutions":["Check parameters.Length > 0 before calling Calculate","Inspect the parameter sweep/generation logic upstream for empty-result bugs","Log a warning and skip the indicator run when no parameter sets are configured"],"exampleFix":"// before\nvar results = calculator.Calculate(candlesSeries, parameters);\n\n// after\nif (parameters is null || parameters.Length == 0)\n    throw new InvalidOperationException(\"No MA crossover parameter sets configured.\");\nvar results = calculator.Calculate(candlesSeries, parameters);","handlingStrategy":"validation","validationCode":"// Validate before calling GpuMovingAverageCrossoverCalculator.Calculate\nif (parameters is null || parameters.Length == 0)\n{\n    throw new InvalidOperationException(\"At least one MA crossover parameter set is required.\");\n}","typeGuard":"static bool IsValidParameters(GpuMovingAverageCrossoverParams[] parameters) =>\n    parameters is { Length: > 0 };","tryCatchPattern":"try\n{\n    var results = calculator.Calculate(candlesSeries, parameters);\n}\ncatch (ArgumentOutOfRangeException ex) when (ex.ParamName == nameof(parameters))\n{\n    logger.LogWarning(\"Empty parameters passed to MA crossover calculator\");\n    return Array.Empty<GpuIndicatorResult[][]>();\n}","preventionTips":["Validate the parameter array at config-load time and fail fast at startup","Provide sensible default parameter sets so the array is never empty","Log a warning whenever the parameter generator yields zero entries"],"tags":["gpu","validation","argument","ilgpu","moving-average-crossover","indicators"],"backgroundTag":null,"analyzedSha":"601a191de678bff83da28b14828f8885214ca71c","analyzedAt":"2026-08-13T20:43:24.460Z","schemaVersion":2},"datasetVersion":"2026-08-14T00:17:13.853Z"}