我有一个BsonDocument
列表:
var list = db.GetCollection<BsonDocument>(collectionName);
var myIds = list.Find(_ => true)
.Project(Builders<BsonDocument>.Projection.Include("_id"))
.ToList();
包含:
myIds = "{ { "_id" : "cc9d9282-c9d2-4cba-a776-ffddsds274d5" }, { "_id" : "2c1ddd82-c9d2-4dda-afr6-d79ff1274d56" }, { "_id" : "ss969281-c9d2-4cba-a776-d79ffds274d5" } }"
并想要像这样查询:
var deleted =list.DeleteMany(Builders<MessageExchange>.Filter.In("_id", myIds));
我也试过以下内容:
var filter = new BsonDocument("_id", new BsonDocument("$in", new BsonArray(myIds)));
var deleted = list.DeleteMany(filter);
返回属性DeletedCount = 0
有人可以指出过滤器似乎有什么问题吗?
您必须从BsonDocument中提取_id,如下所示:
var extractedIds = myIds.Select(x => x["_id"].ToString()).ToList();
之后,您可以在过滤器中使用它。
list.DeleteMany(Builders<MessageExchange>.Filter.In("_id", extractedIds));
确保过滤器的_id部分与MessageExchange类的_id部分匹配
另一种方法是强制输入:
list.DeleteMany(Builders<MessageExchange>.Filter.In(x => x.Id, extractedIds));
这也有效(根据Skami的回答):
var filter = new BsonDocument("_id", new BsonDocument("$in", new BsonArray(extractedIds)));
list.DeleteMany(filter);
因此与MessageExchange
类无关。