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我可以Robomongo運行它,但我不知道如何在C#如何在Mongo C#中搜索嵌套列表?
db.getCollection('package').find({'Items': {$elemMatch: {'Coupons': {$elemMatch:{_id : 33944115}}}}})
我試試這個代碼做到這一點,但跳投返回null。
var filter = Builders<Coupon>.Filter.Eq(coupon => coupon.Id, 33944115);
var filter1 = Builders<Item>.Filter.ElemMatch(item => item.Coupons, filter);
var filter2 = Builders<Package>.Filter.ElemMatch(package => package.Items, filter1);
var result = PackageCollection.Find(filter2).FirstOrDefault();
我的班級:
public class Package
{
public int Id { get; set; }
public IList<Item> Items { get; set; }
}
public class Item
{
public int Id { get; set; }
public IList<Coupon> Coupons { get; set; }
}
public class Coupon
{
public int Id { get; set; }
}