{"record":{"id":"ddfccb5b8884a220","repo":"JamesNK/Newtonsoft.Json","slug":"the-number-of-elements-in-the-source-jobject-is-gr-ddfccb","errorCode":null,"errorMessage":"The number of elements in the source JObject is greater than the available space from arrayIndex to the end of the destination array.","messagePattern":"The number of elements in the source JObject is greater than the available space from arrayIndex to the end of the destination array\\.","errorType":"exception","errorClass":"ArgumentException","httpStatus":null,"severity":"error","filePath":"Src/Newtonsoft.Json/Linq/JObject.cs","lineNumber":683,"sourceCode":"        }\n\n        void ICollection<KeyValuePair<string, JToken?>>.CopyTo(KeyValuePair<string, JToken?>[] array, int arrayIndex)\n        {\n            if (array == null)\n            {\n                throw new ArgumentNullException(nameof(array));\n            }\n            if (arrayIndex < 0)\n            {\n                throw new ArgumentOutOfRangeException(nameof(arrayIndex), \"arrayIndex is less than 0.\");\n            }\n            if (arrayIndex >= array.Length && arrayIndex != 0)\n            {\n                throw new ArgumentException(\"arrayIndex is equal to or greater than the length of array.\");\n            }\n            if (Count > array.Length - arrayIndex)\n            {\n                throw new ArgumentException(\"The number of elements in the source JObject is greater than the available space from arrayIndex to the end of the destination array.\");\n            }\n\n            int index = 0;\n            foreach (JProperty property in _properties)\n            {\n                array[arrayIndex + index] = new KeyValuePair<string, JToken?>(property.Name, property.Value);\n                index++;\n            }\n        }\n\n        bool ICollection<KeyValuePair<string, JToken?>>.IsReadOnly => false;\n\n        bool ICollection<KeyValuePair<string, JToken?>>.Remove(KeyValuePair<string, JToken?> item)\n        {\n            if (!((ICollection<KeyValuePair<string, JToken?>>)this).Contains(item))\n            {\n                return false;\n            }","sourceCodeStart":665,"sourceCodeEnd":701,"githubUrl":"https://github.com/JamesNK/Newtonsoft.Json/blob/4f73e74372445108d2c1bda37b36e6f5e43402e0/Src/Newtonsoft.Json/Linq/JObject.cs#L665-L701","documentation":"ArgumentException thrown by JObject's ICollection<KeyValuePair<string,JToken?>>.CopyTo when the destination array does not have enough space from arrayIndex to its end to hold all the JObject's properties. The count of source properties exceeds (array.Length - arrayIndex).","triggerScenarios":"Calling CopyTo with a destination array sized smaller than jObject.Count minus arrayIndex — e.g. a 2-element buffer for a 5-property object, or a valid arrayIndex that leaves too little room.","commonSituations":"Reusing a fixed-size buffer; sizing the destination from an estimated count that is too small; chaining CopyTo from multiple sources into one buffer without accounting for prior writes.","solutions":["Size the destination from the actual source count: new KeyValuePair<string,JToken?>[jObject.Count + arrayIndex].","Use LINQ ToArray()/ToList() which allocate correctly for you.","Track a running offset and resize the buffer when remaining space is insufficient."],"exampleFix":"// before\nvar arr = new KeyValuePair<string, JToken?>[2];\n((ICollection<KeyValuePair<string, JToken?>>)jObject).CopyTo(arr, 0); // too small\n\n// after\nvar arr = new KeyValuePair<string, JToken?>[jObject.Count];\n((ICollection<KeyValuePair<string, JToken?>>)jObject).CopyTo(arr, 0);","handlingStrategy":"validation","validationCode":"if (jObject.Count > array.Length - arrayIndex) throw new ArgumentException(\"Destination too small.\");\n((ICollection<KeyValuePair<string, JToken?>>)jObject).CopyTo(array, arrayIndex);","typeGuard":null,"tryCatchPattern":"try { ((ICollection<KeyValuePair<string,JToken?>>)jObject).CopyTo(arr, idx); }\ncatch (ArgumentException ex) when (ex.Message.Contains(\"greater than the available space\"))\n{\n    Array.Resize(ref arr, idx + jObject.Count);\n    ((ICollection<KeyValuePair<string,JToken?>>)jObject).CopyTo(arr, idx);\n}","preventionTips":["Size the destination from the actual source: jObject.Count + arrayIndex.","Use LINQ ToArray()/ToList() to avoid manual sizing.","Resize buffers when remaining space is insufficient."],"tags":["newtonsoft-json","linq-to-json","jobject","copyto","argument-validation"],"analyzedSha":"4f73e74372445108d2c1bda37b36e6f5e43402e0","analyzedAt":"2026-08-07T06:10:08.596Z","schemaVersion":2},"datasetVersion":"2026-08-07T07:17:06.508Z"}