[英]Converting inconsistent json values using System.Text.Json
The service I'm working with returns an empty array instead of null for objects.我正在使用的服务为对象返回一个空数组而不是 null。 Which causes errors during deserialization.
这会在反序列化过程中导致错误。
System.Text.Json.JsonException : The JSON value could not be converted to Models.Error.
System.Text.Json.JsonException:无法将 JSON 值转换为 Models.Error。 Path: $.errors |
路径:$.errors | LineNumber: 8 |
行号:8 | BytePositionInLine: 13.
字节位置内联:13。
Sample #1:示例#1:
{
"data": {
"code": 100,
"message": "Success",
"authority": "A00000000000000000000000000112233444",
"fee_type": "Payer",
"fee": 10
},
"errors": []
}
Sample #2:示例#2:
{
"data": [],
"errors": {
"code": -9,
"message": "The input params invalid, validation error."
}
}
This is what it came up with:这是它想出的:
internal class InconsistentConverter<T> : JsonConverter<T>
{
public override T Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
{
if (reader.TokenType == JsonTokenType.StartArray)
{
_ = reader.Read();
return default;
}
return JsonSerializer.Deserialize<T>(ref reader, options);
}
public override void Write(Utf8JsonWriter writer, T objectToWrite, JsonSerializerOptions options)
{
throw new NotImplementedException();
}
}
I want to use the converter for the data as well:我也想将转换器用于数据:
public class Result<T>
where T : class
{
[JsonPropertyName("data")]
[JsonConverter(typeof(InconsistentConverter<T>))] // can't do this
public T? Data { get; set; }
[JsonPropertyName("errors")]
[JsonConverter(typeof(InconsistentConverter<Error>))] // this works
public Error? Error { get; set; }
}
I guess this would've been really easy in Json.NET but unfortunately I can't use it here.我想这在 Json.NET 中会很容易,但不幸的是我不能在这里使用它。
A quick workaround is to create a non-generic version of your converter:一个快速的解决方法是创建转换器的非通用版本:
internal class InconsistentConverter : JsonConverter<object>
{
public override bool CanConvert(Type typeToConvert) => true;
public override object Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
{
if (reader.TokenType == JsonTokenType.StartArray)
{
_ = reader.Read();
return default;
}
var deserialize = JsonSerializer.Deserialize(ref reader, typeToConvert, options);
return deserialize;
}
public override void Write(Utf8JsonWriter writer, object objectToWrite, JsonSerializerOptions options)
{
throw new NotImplementedException();
}
}
And use it for the generic property:并将其用于通用属性:
public class Result<T>
where T : class
{
[JsonPropertyName("data")]
[JsonConverter(typeof(InconsistentConverter))]
public T? Data { get; set; }
[JsonPropertyName("errors")]
[JsonConverter(typeof(InconsistentConverter<Error>))] // this works
public Error? Error { get; set; }
}
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