2
我有一个这样的文件:过滤器+ ElemMatch
{
"File" : "xxxxxxx.txt",
"Content" : [
{ "tag" : "Book",
"name" : "TestBook1",
"value" : "xxx"
},
{ "tag" : "Dept",
"name" : "TestDept1",
"value" : "yyy"
},
{ "tag" : "Employee",
"name" : "TestEmployee1",
"value" : "zzz"
}]
}
用下面的代码
var subFilter = Builders<BsonDocument>.Filter.Eq("tag", "Dept");
var filter = Builders<BsonDocument>.Filter.ElemMatch("Content", subFilter);
var result =
collection.Find(filter)
.Project(Builders<BsonDocument>.Projection.Exclude("_id").Include("Content.$"))
.ToList();
我能得到
{
"tag" : "Dept",
"name" : "TestDept1",
"value" : "yyy"
}
,我应该怎么做,如果我还需要过滤File
字段?
所以我的查询是这样的:
If File = "xxxxxx.txt" and Content.tag = "Dept"
试试这个。 var andFilter = subFilter&filter var result = collection.Find(andFilter).Project(Builders .Projection.Exclude(“_ id”).include(“Content。$”)) .ToList(); –
notionquest
什么驱动程序版本? – profesor79