如何修复 {document}.Id 不支持错误

Question

我的 mongo 域对象有继承：

public abstract class Entity : IEntity
{
   [BsonId]     
   [BsonRepresentation(BsonType.ObjectId)]
   public string Id { get; set; }
   [BsonIgnore]
   public abstract string CollectionName { get; }
}

[BsonDiscriminator(Required = true)]
[BsonKnownTypes(typeof(Sub1), typeof(Sub2), typeof(Sub3))]
public class Main:Entity
{
   public string Name {get; set;}
   public string Address {get; set;}
}

[BsonDiscriminator(SubType.Sub1)]
public class Sub1: Main, IWorkAttached
{}

[BsonDiscriminator(SubType.Sub2)]
public class Sub2: Main, IWorkAttached
{}

[BsonDiscriminator(SubType.Sub3)]
public class Sub3: Main
{}

public interface IWorkAttached
{
   public string WorkId {get; set;}
}

我有更新实体的方法：

public void Update(IWorkAttached entity)
{
   var col = _db.GetCollection<IWorkAttached>("ColName");
   var updDefinition = Builders<IWorkAttached>.Update
      .Set(t => t.Name, entity.Name)
      .Set(t => t.Address, entity.Address)
      .Set(t => t.WorkId, entity.WorkId) // interface property

   col.UpdateOne(t => t.Id == entity.Id, updDefinition)
}

这个想法是有一种方法来更新两种类型的实体（Sub1和Sub2），然后我可以将它用于这两个实体：

var sub1 = new Sub1 {...};
var sub2 = new Sub2 {...};

Update(sub1);
Update(sub2);

但是，这不起作用。我得到以下异常：

不支持 {document}.Id。

如果我在方法中使用特定类型Update而不是接口，那么一切正常。是否可以以这种方式使用 mongo 驱动程序？

堆栈跟踪：

   at MongoDB.Driver.Linq.Translators.PredicateTranslator.GetFieldExpression(Expression expression)
   at MongoDB.Driver.Linq.Translators.PredicateTranslator.TranslateComparison(Expression variableExpression, ExpressionType operatorType, ConstantExpression constantExpression)
   at MongoDB.Driver.Linq.Translators.PredicateTranslator.Translate(Expression node)
   at MongoDB.Driver.Linq.Translators.PredicateTranslator.Translate(Expression node, IBsonSerializerRegistry serializerRegistry)
   at MongoDB.Driver.MongoCollectionImpl`1.ConvertWriteModelToWriteRequest(WriteModel`1 model, Int32 index)
   at System.Linq.Enumerable.<SelectIterator>d__154`2.MoveNext()
   at MongoDB.Driver.Core.Operations.BulkMixedWriteOperation.BatchHelper.<FindOrderedRuns>d__8.MoveNext()
   at MongoDB.Driver.Core.Misc.ReadAheadEnumerable`1.ReadAheadEnumerator.MoveNext()
   at MongoDB.Driver.Core.Operations.BulkMixedWriteOperation.BatchHelper.<GetBatches>d__6.MoveNext()
   at MongoDB.Driver.Core.Operations.BulkMixedWriteOperation.<ExecuteAsync>d__39.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at MongoDB.Driver.OperationExecutor.<ExecuteWriteOperationAsync>d__3`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at MongoDB.Driver.MongoCollectionImpl`1.<ExecuteWriteOperationAsync>d__62`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at MongoDB.Driver.MongoCollectionImpl`1.<BulkWriteAsync>d__22.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at MongoDB.Driver.MongoCollectionBase`1.<UpdateOneAsync>d__47.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)

Answer 1

确保您的房产有public getter & setter，这就是我的情况的问题。