{"record":{"id":"7ba37b4878b5e009","repo":"JamesNK/Newtonsoft.Json","slug":"can-not-convert-0-to-int32","errorCode":null,"errorMessage":"Can not convert {0} to Int32.","messagePattern":"Can not convert (.+?) to Int32\\.","errorType":"exception","errorClass":"ArgumentException","httpStatus":null,"severity":"error","filePath":"Src/Newtonsoft.Json/Linq/JToken.cs","lineNumber":815,"sourceCode":"            {\n                return (char?)integer;\n            }\n#endif\n\n            return (v.Value != null) ? (char?)Convert.ToChar(v.Value, CultureInfo.InvariantCulture) : null;\n        }\n\n        /// <summary>\n        /// Performs an explicit conversion from <see cref=\"JToken\"/> to <see cref=\"Int32\"/>.\n        /// </summary>\n        /// <param name=\"value\">The value.</param>\n        /// <returns>The result of the conversion.</returns>\n        public static explicit operator int(JToken value)\n        {\n            JValue? v = EnsureValue(value);\n            if (v == null || !ValidateToken(v, NumberTypes, false))\n            {\n                throw new ArgumentException(\"Can not convert {0} to Int32.\".FormatWith(CultureInfo.InvariantCulture, GetType(value)));\n            }\n\n#if HAVE_BIG_INTEGER\n            if (v.Value is BigInteger integer)\n            {\n                return (int)integer;\n            }\n#endif\n\n            return Convert.ToInt32(v.Value, CultureInfo.InvariantCulture);\n        }\n\n        /// <summary>\n        /// Performs an explicit conversion from <see cref=\"JToken\"/> to <see cref=\"Int16\"/>.\n        /// </summary>\n        /// <param name=\"value\">The value.</param>\n        /// <returns>The result of the conversion.</returns>\n        public static explicit operator short(JToken value)","sourceCodeStart":797,"sourceCodeEnd":833,"githubUrl":"https://github.com/JamesNK/Newtonsoft.Json/blob/4f73e74372445108d2c1bda37b36e6f5e43402e0/Src/Newtonsoft.Json/Linq/JToken.cs#L797-L833","documentation":"Thrown by the explicit (non-nullable) cast operator int(JToken) at JToken.cs:815. The token type must be in NumberTypes = {Integer, Float, String, Comment, Raw, Boolean}. A JSON null, a Date/Guid/Uri/Bytes value, or a container (JObject/JArray) fails this ArgumentException. Non-numeric string contents fail later with FormatException, not this message.","triggerScenarios":"Casting a JSON null JValue to (int)token; casting a JTokenType.Date/Object/Array/Guid to int; an omitted field parsed as null.","commonSituations":"An optional count/quantity that returned null; a field re-typed to an object; reading a Date-typed value as an integer index.","solutions":["Use the nullable cast (int?)token and coalesce: ((int?)token) ?? 0.","Guard with token.Type == JTokenType.Integer || token.Type == JTokenType.Float before the cast.","Use token.Value<int?>() to tolerate null/missing.","Deserialize into a nullable int POCO property."],"exampleFix":"// before\nint count = (int)token[\"count\"]; // throws when count is null\n\n// after\nint count = (int?)token[\"count\"] ?? 0;","handlingStrategy":"type-guard","validationCode":"// Verify the token is a number-compatible scalar before the non-nullable int cast\nstatic bool CanToInt(JToken? t) =>\n    t is JValue v && (v.Type == JTokenType.Integer || v.Type == JTokenType.Float\n                      || v.Type == JTokenType.String || v.Type == JTokenType.Boolean);","typeGuard":"static int? SafeInt(JToken? t) => t switch {\n    JValue v when v.Type is JTokenType.Integer or JTokenType.Float\n                       or JTokenType.String or JTokenType.Boolean => (int?)t,\n    JValue v when v.Type is JTokenType.Null or JTokenType.Undefined => null,\n    _ => null\n};","tryCatchPattern":"try\n{\n    int i = (int)token;\n}\ncatch (ArgumentException ex) when (ex.Message.StartsWith(\"Can not convert\"))\n{\n    // token is null/container/date; default to 0\n}","preventionTips":["Use the nullable cast (int?)token for fields that may be JSON null.","Check token.Type is Integer/Float before the non-nullable int cast.","Prefer token.Value<int?>() which tolerates missing/null.","Deserialize into a nullable int POCO property."],"tags":["linq-to-json","jtoken","cast","int32","argumentexception"],"analyzedSha":"4f73e74372445108d2c1bda37b36e6f5e43402e0","analyzedAt":"2026-08-07T06:10:08.596Z","schemaVersion":2},"datasetVersion":"2026-08-07T07:17:06.508Z"}