MongoDB C#/.NET 驅動程序 - 如何反序列化 UUID 和 ISODate

Question

我在 MongoDB 集合中有一個文檔，如下所示：

{
  _id: new UUID("31daac77-bcbc-4cd5-bb93-382440f46f16"),
  CompanyId: 'XYZ',
  RequestDate: ISODate("2023-01-10T07:52:32.840Z")
}

它對應於 object，如下所示：

public class ReportRequest
{
    public ReportRequest(string companyId)
    {
        this.Id = Guid.NewGuid();
        this.CompanyId = companyId;
        this.RequestDate = DateTime.UtcNow;
    }

    [BsonId]
    [BsonElement("_id")]
    [BsonGuidRepresentation(GuidRepresentation.Standard)]
    public Guid Id { get; }

    [BsonElement]
    public string CompanyId { get; }

    [BsonElement]
    [BsonDateTimeOptions(Kind = DateTimeKind.Utc)]
    public DateTime RequestDate { get; }
}

然后我嘗試查詢具有特定CompanyId的所有文檔：

public async Task PrintAvailableReportDatesAsync(string companyId)
{
    var filter = Builders<ReportRequest>.Filter.Eq(r => r.CompanyId, companyId);
    var cursor = await _collection.FindAsync(filter);
    var reportRequests = await cursor.ToListAsync();

    foreach (var req in reportRequests)
        Console.WriteLine($"Id: {req.Id.ToString()}, Date: {req.RequestDate}");
}

我希望得到以下 output：

編號：31daac77-bcbc-4cd5-bb93-382440f46f16，日期：2023-01-10T07:52:32.840Z

相反，我得到這個：

編號：00000000-0000-0000-0000-000000000000，日期：0001-01-01T00:00:00

我究竟做錯了什么？

Answer 1

根據我在本地進行的測試，這些屬性的值是在構造函數中分配的。

有兩種方法可以修復它：

方法 1：為所有屬性提供設置器

public class ReportRequest
{
    public ReportRequest(string companyId)
    {
        this.Id = Guid.NewGuid();
        this.CompanyId = companyId;
        this.RequestDate = DateTime.UtcNow;
    }

    [BsonId]
    [BsonGuidRepresentation(GuidRepresentation.Standard)]
    public Guid Id { get; set; }

    public string CompanyId { get; set; }

    [BsonDateTimeOptions(Kind = DateTimeKind.Utc)]
    public DateTime RequestDate { get; set; }
}

演示

---

方法 2：創建具有三個參數的構造函數

public class ReportRequest
{
    ...

    public ReportRequest(Guid id, string companyId, DateTime requestDate)
    {
        this.Id = id;
        this.CompanyId = companyId;
        this.RequestDate = requestDate;
    }

    ...
}

演示