dotnet type_error ai_generated true

System.Text.Json.JsonException: JSON 值无法转换为 System.String。路径: $.propertyName | 行号: 1 | 字节位置: 20。

System.Text.Json.JsonException: The JSON value could not be converted to System.String. Path: $.propertyName | LineNumber: 1 | BytePositionInLine: 20.

ID: dotnet/serialization-json-ignore-attribute

其他格式: JSON · Markdown 中文 · English
90%修复率
85%置信度
1证据数
2023-06-20首次发现

版本兼容性

版本状态引入弃用备注
System.Text.Json 6.0.x active — — —
System.Text.Json 7.0.x active — — —
System.Text.Json 8.0.x active — — —

根因分析

System.Text.Json 反序列化失败，因为 JSON 属性类型不匹配（例如数字而非字符串）或缺失，通常由模型属性不匹配（如 JsonIgnore）引起。

English

System.Text.Json deserialization fails because a JSON property has an unexpected type (e.g., number instead of string) or is missing, often due to mismatched model attributes like JsonIgnore.

generic

官方文档

https://learn.microsoft.com/en-us/dotnet/standard/serialization/system-text-json/how-to?pivots=dotnet-8-0

解决方案

  1. Add a custom JsonConverter to handle type conversion, e.g., convert number to string.
  2. Use JsonSerializerOptions.Converters to register converter globally.
  3. Change the C# model property type to object or JsonElement and handle casting manually.

无效尝试

常见但无效的做法:

  1. 95% 失败

    Adding JsonSerializerOptions.IgnoreNullValues doesn't fix type mismatches.

  2. 80% 失败

    Changing the JSON source to match the C# model is often not feasible in production.

  3. 90% 失败

    Using JsonSerializerOptions.PropertyNameCaseInsensitive only helps with casing, not types.