Question

假设我有din文件

"Id" : "lot1",
"Fruits" : [
       [{ "Id": "fruit1", "Name": "apple"}, { "Id": "fruit2", "Name": "carrot"}]
       [{ "Id": "fruit3", "Name": "banana"}]
     ]

问：如何通过水果名称列表查询Fruits数组？

我试过这样的话：

var fruitNames = new List<string>(){ "apple", "banana" };
var builder = Builders<Lot>.Filter;
var filter = builder.AnyIn(l => l.Fruits.Select(f => f.Name), fruitNames); //TAKE 1
var filter = builder.Where(l => l.Fruits.Select(f => f.Name).Any(f => fruitNames.Contains(f)));//TAKE 2
var filter = builder.AnyIn("Fruits.Name", fruitNames );//TAKE 3
var results = mongoContext.Lots.Find(filter).ToList();

我尝试了这3种方法但没有成功。

Answer 1

你能试试吗？这是一个小小的黑客，但我很确定它会起作用：

var filter= Builders<Lot>.Filter.ElemMatch(y => y.fruits, x => fruitNames.Contains(x.name));

MongoDb中对象数组的复杂查询过滤（C＃Driver）

1 个答案: