{"record":{"id":"0e4bf62af9edff10","repo":"microsoft/aspire","slug":"the-leading-resource-argument-to-remove-cannot-be-empty","errorCode":null,"errorMessage":"The leading resource argument to remove cannot be empty.","messagePattern":"The leading resource argument to remove cannot be empty\\.","errorType":"validation","errorClass":"ArgumentException","httpStatus":null,"severity":"error","filePath":"src/Aspire.Hosting/ApplicationModel/ProjectLaunchArgsOverrideAnnotation.cs","lineNumber":76,"sourceCode":"    }\n\n    private static IReadOnlyList<string> ValidateArguments(IReadOnlyList<string> arguments)\n    {\n        ArgumentNullException.ThrowIfNull(arguments);\n\n        if (arguments.Count == 0)\n        {\n            throw new ArgumentException(\"Launch arguments must contain at least one entry.\", nameof(arguments));\n        }\n\n        return arguments;\n    }\n\n    private static string? ValidateLeadingResourceArgumentToRemove(string? leadingResourceArgumentToRemove)\n    {\n        if (leadingResourceArgumentToRemove is not null && leadingResourceArgumentToRemove.Length == 0)\n        {\n            throw new ArgumentException(\"The leading resource argument to remove cannot be empty.\", nameof(leadingResourceArgumentToRemove));\n        }\n\n        return leadingResourceArgumentToRemove;\n    }\n}\n","sourceCodeStart":58,"sourceCodeEnd":82,"githubUrl":"https://github.com/microsoft/aspire/blob/25830f84bd145686607ad00c057b3f84e2e51d43/src/Aspire.Hosting/ApplicationModel/ProjectLaunchArgsOverrideAnnotation.cs#L58-L82","documentation":"ValidateLeadingResourceArgumentToRemove permits null (no removal) but rejects the empty string. An empty value would be interpreted as 'remove the first empty argument', which is meaningless, so it is treated as an invalid argument rather than 'no removal'.","triggerScenarios":"Passing \"\" as LeadingResourceArgumentToRemove to the ProjectLaunchArgsOverrideAnnotation constructor or property setter; deriving the value from a substring/split operation that returned empty.","commonSituations":"A config value or CLI arg was present but empty (e.g. LEADING_ARG=\"\"); splitting an argument string that produced an empty first token; translating a nullable source where empty and missing were conflated.","solutions":["Pass null to indicate no removal instead of \"\"","Normalize: leadingArg.Length == 0 ? null : leadingArg before assigning","Fix the source (env var / config) that supplies an empty string"],"exampleFix":"// before\nvar annotation = new ProjectLaunchArgsOverrideAnnotation(args, leadingArg: envValue ?? \"\");\n// after\nvar annotation = new ProjectLaunchArgsOverrideAnnotation(args, leadingArg: string.IsNullOrEmpty(envValue) ? null : envValue);","handlingStrategy":"validation","validationCode":"leadingArg = string.IsNullOrEmpty(leadingArg) ? null : leadingArg;","typeGuard":null,"tryCatchPattern":"try { new ProjectLaunchArgsOverrideAnnotation(args, leadingArg); } catch (ArgumentException) { /* normalize empty to null and retry */ }","preventionTips":["Normalize empty strings to null for optional values","Never split/conflate 'missing' and 'empty' config inputs"],"tags":["launch-configuration","argument-validation","aspire-hosting"],"backgroundTag":"empty-required-field","analyzedSha":"25830f84bd145686607ad00c057b3f84e2e51d43","analyzedAt":"2026-09-16T11:10:06.193Z","contentChangedAt":"2026-09-16T11:10:06.193Z","schemaVersion":2},"datasetVersion":"2026-09-21T04:17:39.646Z"}