有时候返回时这个
{
	"infcode": -1,
	"detail_msg": null
}
 
有时后也可能时这个
 
{
	"infcode": "-1",
	"detail_msg": null
}

public class IntJsonConverter : JsonConverter<string>  //这里因为实体类的属性是string 这里就配置储层string
    {
        public override string? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
        {
	
            if (reader.TokenType == JsonTokenType.Number)
            {
		//这里就简单处理以下 如果时number, 转换为decimal后在toString即可
                return reader.GetDecimal().ToString();
            }
            else
            {
                return reader.GetString();
            }
        }     
    }

 var serializeOptions = new JsonSerializerOptions
 {
 	WriteIndented = true,
 };
serializeOptions.Converters.Add(new IntJsonConverter());
fsiResponse = JsonSerializer.Deserialize<FsiResponse>(contentStream, serializeOptions);

 public class FsiResponse
    {
        [JsonConverter(typeof(IntJsonConverter))]
        public string? infcode { get; set; }

fsiResponse = JsonSerializer.Deserialize<FsiResponse>(contentStream);