C#中API GET数据无法正确映射至PUT请求的问题求助

我在C#中实现从API获取数据并复用部分字段发起PUT请求的功能时遇到异常：仅titleId能正确更新，imageUrl、playerName、allianceId、rankId未从GET返回结果中取值，honor和prestige使用了模型默认值。以下是相关日志与代码，求排查方向：

日志信息 #

2023-06-24 00:10:29.270 +00:00 [INF] Response received for /api/MemberDetail/"c4566a7e-fe3d-46e4-abbe-c34d2fc097ce":

{
 "memberId":"c4566a7e-fe3d-46e4-abbe-c34d2fc097ce",
 "imageUrl":"https://dev.xcl.one/Players/a9d17140-2a6b-465d-bcfb-a13770c03eda.jpg",
 "playerName":"FLU",
 "allianceId":"47f2cbcc-91e8-4d3a-ae95-27b2a3782bc1",
 "titleId":"3ccbba59-85fb-491e-92e6-f17f2584776b",
 "rankId":"bdbfe6e6-b515-42d3-b9c8-9dbba42fd06f",
 "honor":0,
 "prestige":100,
 "dateTimeUtc":"2023-06-23T18:35:59.7925881"
}

2023-06-24 00:10:29.287 +00:00 [INF] Sending PUT request with content:

{
 "memberId":"c4566a7e-fe3d-46e4-abbe-c34d2fc097ce",
 "titleId":"2902c1c0-0fba-4b04-908c-2c2aa7183c82",
 "imageUrl":"",
 "playerName":"",
 "allianceId":"00000000-0000-0000-0000-000000000000",
 "rankId":"00000000-0000-0000-0000-000000000000",
 "honor":0,
 "prestige":100,
 "dateTimeUtc":"2023-06-24T00:10:29.2785496Z"
}

问题代码 #

var getResponse = await client.GetAsync($"/api/MemberDetail/{passedMemberId}");

//_logger.LogInformation("GET request sent to /api/MemberDetail/{passedMemberId}", passedMemberId);

if (getResponse.IsSuccessStatusCode)
{
    var responseContent = await getResponse.Content.ReadAsStringAsync();
    _logger.LogInformation("Response received for /api/MemberDetail/{passedMemberId}: {responseContent}", passedMemberId, responseContent);

    if (!string.IsNullOrEmpty(responseContent))
    {
        var memberApiDetail = JsonSerializer.Deserialize<MemberDetail>(responseContent);

        if (memberApiDetail != null)
        {
            var promotionPayload = new
            {
                memberId = passedMemberId,
                titleId = passedTitleId,
                imageUrl = memberApiDetail.ImageUrl,
                playerName = memberApiDetail.PlayerName,
                allianceId = memberApiDetail.AllianceId,
                rankId = memberApiDetail.RankId,
                honor = memberApiDetail.Honor != 0 ? memberApiDetail.Honor : 0,
                prestige = memberApiDetail.Prestige != 100 ? memberApiDetail.Prestige : 100,
                dateTimeUtc = memberApiDetail.DateTimeUtc
            };

            var promotionPayloadString = JsonSerializer.Serialize(promotionPayload);
            var putContent = new StringContent(promotionPayloadString, Encoding.UTF8, "application/json");

            _logger.LogInformation("Sending PUT request with content: {content}", promotionPayloadString);

            var response = await client.PutAsync($"/api/MemberDetail/{passedMemberId}", putContent);

            if (response.IsSuccessStatusCode)
            {
                //_logger.LogInformation("Promotion successfully updated for memberId: {memberId}", passedMemberId);
            }
        }
    }
}
...
public class MemberDetail
{
    //public Guid Id { get; set; }
    [Key] 
    public Guid MemberId { get; set; }
    public string ImageUrl { get; set; } = string.Empty;
    public string PlayerName { get; set; } = string.Empty;
    public Guid AllianceId { get; set; } = Guid.Empty;
    public Guid TitleId { get; set; } = Guid.Empty;
    public Guid RankId { get; set; } = Guid.Empty;
    public int Honor { get; set; } = 0;
    public long Prestige { get; set; } = 100;
    public DateTime DateTimeUtc { get; set; } = DateTime.UtcNow;
}

排查方向 #

• 修复JSON反序列化大小写不匹配问题：
  MemberDetail类属性是大驼峰格式（如ImageUrl），但API返回的JSON字段是小驼峰（如imageUrl），默认System.Text.Json不会自动映射大小写，导致反序列化时这些字段无法被赋值，只能用类的默认值。解决方法是添加反序列化配置：

  var options = new JsonSerializerOptions { PropertyNameCaseInsensitive = true };
  var memberApiDetail = JsonSerializer.Deserialize<MemberDetail>(responseContent, options);
  

• 移除冗余的字段判断逻辑：
  honor和prestige的三元判断完全多余，比如memberApiDetail.Honor != 0 ? memberApiDetail.Honor : 0，因为Honor默认值就是0，API返回值也是0，直接使用memberApiDetail.Honor和memberApiDetail.Prestige即可，避免逻辑冗余。

• 验证反序列化结果：
  在反序列化后添加日志输出memberApiDetail的所有属性值，确认是否确实从API获取到数据：

  _logger.LogInformation("Deserialized data: ImageUrl={0}, PlayerName={1}, AllianceId={2}", 
      memberApiDetail.ImageUrl, memberApiDetail.PlayerName, memberApiDetail.AllianceId);
  

  以此确认是反序列化环节的问题，还是构建promotionPayload时的问题。

内容的提问来源于stack exchange，提问作者AlwaysResearching