mongodb c sharp驱动文档更新报错

Question

我正在使用 c# mongo db 驱动程序来插入和更新文档。首先我插入一条记录，然后我尝试使用 FindOneAndUpdateAsync 方法更新特定的记录字段。我能够正确更新它，但更新后我收到错误“缺少类 SampleApp.Person 的属性‘名称’的必需元素‘名称’。”我使用的是 MongoCommunity 版本 4.4.1，而 mongo 驱动程序是 2.11.4。

我附上 mongo 指南针视图的图像供您参考。

我的收藏结构是

[BsonSerializer(typeof(ImpliedImplementationInterfaceSerializer<IPerson, Person>))]
public interface IPerson
{
    string Id { get; set; }
    string Name { get; set; }
    int Age { get; set; }
    string Email { get; set; }
    IAddress Address { get; set; }
    bool IsActive { get; set; }
}

public class Person : IPerson
{
    [BsonId]
    public string Id { get; set; }

    [BsonRequired]
    
    public string Name { get; set; }

    [BsonRequired]
    public int Age { get; set; }
    public string Email { get; set; }
    public IAddress Address { get; set; }

    [BsonRequired]
    public bool IsActive { get; set; }
}

public interface IAddress
{
    string Line1 { get; set; }
    string Line2 { get; set; }
    string Line3 { get; set; }
    string City { get; set; }
    string State { get; set; }
    string Pincode { get; set; }
}

public class Address : IAddress
{
    public string Line1 { get; set; }
    public string Line2 { get; set; }
    public string Line3 { get; set; }
    public string City { get; set; }
    public string State { get; set; }
    public string Pincode { get; set; }
}

我的插入和更新代码如下所示。

MongoClient client = new MongoClient("mongodb://localhost:27017");
var database = client.GetDatabase("test");
BsonClassMap.RegisterClassMap<Address>();
var peopleCollection = database.GetCollection<IPerson>("People");
IPerson person = new Person()
{
    Age = 50,
    Email = "a@a.com",
    IsActive = false,
    Name = "David",
    Id = ObjectId.GenerateNewId().ToString()
};
try
{
    await peopleCollection.InsertOneAsync(person);
    IAddress address = new Address()
    {
        City = "Bengaluru",
        Line1 = "Bengaluru",
        Line2 = "Bengaluru",
        Line3 = "Bengaluru",
        Pincode = "560001",
        State = "KA"
    };

    var updateDefinition = Builders<IPerson>.Update.Set(x => x.Address, address).Set(x => 
    x.IsActive, true);
    var filter = Builders<IPerson>.Filter.Eq(x => x.Email, "a@a.com");
    FindOneAndUpdateOptions<IPerson> updateOptions = new FindOneAndUpdateOptions<IPerson>
    {
        IsUpsert = false,
        ReturnDocument = ReturnDocument.After,
        Projection = Builders<IPerson>.Projection.Include(c => c.Address)
    };
    IPerson updatedPerson = await peopleCollection.FindOneAndUpdateAsync(filter, updateDefinition, updateOptions);

    }
    catch (Exception ex)
    {
       string s = ex.Message;
       Console.WriteLine(s);
    }

Answer 1

我的猜测是更新前的值根本没有 Name 属性，所以当FindOneAndUpdateAsync 获取数据并尝试反序列化它（在更新之前）它会失败并出现该错误。

两种解决方案

1. 尝试删除[BsonRequired]，以避免出现此错误。
2. 在运行代码之前，尝试更新 MongoDB 实例中的所有文档，使其具有 Name 属性。