向 Mongo 添加复杂的类
我在尝试向 Mongo 中的现有文档添加复杂类型时遇到了麻烦。
我有以下两节课。
public class UserObjectCollection {
[BsonId]
public Guid UserId { get; set; }
public Dictionary<string, object> UserObjects { get; set; }
public UserObjectCollection() {
UserObjects = new Dictionary<string, object>();
}
}
public class ComplexClass {
public string Bar { get; set; }
public int Foo { get; set; }
}
然后我创建一个新对象用于插入。
var bd = new UserObjectCollection() {
UserId = Guid.NewGuid(),
UserObjects = {
{ "data", 12 },
{ "data2", 123 },
{ "data3", new ComplexClass() { Bar= "bar", Foo=1234 } }
}
};
插入文档。
mongoCollection.Insert(bd.ToBsonDocument());
我得到了结果文件。
{“_id”：BinData（3，“t089M1E1j0OFVS3YVuEDwg==”），“UserObjects”：{“数据”：12， “数据2”：123，“数据3”：{“_t”：“ComplexClass”，“酒吧”：“酒吧”，“Foo”：1234} } }
文档插入正确。然后我修改其中一个值。
var query = Query.EQ("UserObjects.data", BsonValue.Create(12));
collection.FindAndModify(
query,
SortBy.Null,
Update.SetWrapped<ComplexClass>("data2", new ComplexClass() { Foo = -1234, Bar = "FooBar" }),
returnNew: false,
upsert: true);
数据库中显示的文档。
{“UserObjects”：{“数据”：12，“数据2”：{“酒吧”：“FooBar”，“Foo”：-1234}， "data3" : { "_t" : "ComplexClass", "Bar" : "bar", "Foo" : 1234 } }, "_id" : BinData(3,"W11Jy+hYqE2nVfrBdxn54g==") }
如果我尝试检索此记录时，我收到 FileFormatException。
var theDocument = collection.Find(query).First();
（未处理的异常：System.IO.FileFormatException：无法确定实际的t 要反序列化的对象的类型。 NominalType 是 System.Object，BsonType 是 Docum 条目。）。
与 data3 不同，data2 没有鉴别器。我在做什么？
I'm having trouble when trying to add complex types to existing documents in Mongo.
I have the following two classes.
public class UserObjectCollection {
[BsonId]
public Guid UserId { get; set; }
public Dictionary<string, object> UserObjects { get; set; }
public UserObjectCollection() {
UserObjects = new Dictionary<string, object>();
}
}
public class ComplexClass {
public string Bar { get; set; }
public int Foo { get; set; }
}
I then create a new object for insertion.
var bd = new UserObjectCollection() {
UserId = Guid.NewGuid(),
UserObjects = {
{ "data", 12 },
{ "data2", 123 },
{ "data3", new ComplexClass() { Bar= "bar", Foo=1234 } }
}
};
Insert the document.
mongoCollection.Insert(bd.ToBsonDocument());
And I get the resulting document.
{ "_id" : BinData(3,"t089M1E1j0OFVS3YVuEDwg=="), "UserObjects" : { "data" : 12,
"data2" : 123, "data3" : { "_t" : "ComplexClass", "Bar" : "bar", "Foo" : 1234 }
} }
The document inserts correctly. Then I modify one of the values.
var query = Query.EQ("UserObjects.data", BsonValue.Create(12));
collection.FindAndModify(
query,
SortBy.Null,
Update.SetWrapped<ComplexClass>("data2", new ComplexClass() { Foo = -1234, Bar = "FooBar" }),
returnNew: false,
upsert: true);
The document as it appears in the database.
{ "UserObjects" : { "data" : 12, "data2" : { "Bar" : "FooBar", "Foo" : -1234 },
"data3" : { "_t" : "ComplexClass", "Bar" : "bar", "Foo" : 1234 } }, "_id" : BinData(3,"W11Jy+hYqE2nVfrBdxn54g==") }
If I attempt to retrieve this record, I get a FileFormatException.
var theDocument = collection.Find(query).First();
(Unhandled Exception: System.IO.FileFormatException: Unable to determine actual t
ype of object to deserialize. NominalType is System.Object and BsonType is Docum
ent.).
Unlike data3, data2 doesn't have a discriminator. What am I doing?
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（2）
好的，如果驱动程序想要鉴别器，您可以通过将您的类强制转换为更新中的对象来提供它：
这将解决您的问题。
顺便说一句，您的更新实际上并未更新 UserObjects 中的 data2 字段，而是在文档中创建新的 data2 字段，以下代码应该可以正常工作：
Okay, if driver want discriminator you can give it by casting your class to object in update:
This will solve your issue.
BTW, your update not actually updating data2 field within
UserObjects, it creating new data2 field within document, following code should work correctly:解串器无法根据 Bson 表示自行确定应使用什么类型。看看我前几天的提问吧。我认为它澄清了一些事情。实现 BsonSerialized 可以解决这个问题。
存储复合/嵌套对象图
The Deserializer can't figure out it self what type it should used based on Bson representation. Take a look at my question a few days ago. I think it clarifies a few things. Implementing BsonSerializable would solve the Issue.
Storing composite/nested object graph