我有两个模型,一个是用户和一个团队,如下所示:
[BsonRepresentation(BsonType.ObjectId)]
public ObjectId _id { get; set; }
[Display(Name = "Password:")]
public string Password { get; set; }
[Display(Name = "Confirm:")]
public string ConfirmPassword { get; set; }
[Display(Name = "Email:")]
public string Email { get; set; }
[Display(Name = "Username:")]
public string UserName { get; set; }
[Display(Name = "Firtname:")]
public string Firstname { get; set; }
[Display(Name = "Lastname:")]
public string Lastname { get; set; }
[Display(Name = "Country:")]
public string Country { get; set; }
[Display(Name = "City:")]
public string City { get; set; }
[Display(Name = "Birthdate:")]
public int Birthdate { get; set; }
public List<Team> Teams { get; set; }
[BsonRepresentation(BsonType.ObjectId)]
public ObjectId TeamID { get; set; }
public string TeamName { get; set; }
public string UserName { get; set; }
public int LeagueID { get; set; }
public List<Player> Player { get; set; }
所以我创建了一个用户,但现在我想向我的用户添加团队。 这是我正在使用的代码:
var databaseClient = new MongoClient(Settings.Default.FantasySportsConnectionString);
var server = databaseClient.GetServer();
var database = server.GetDatabase("Users");
var collection = database.GetCollection<User>("users");
var user = collection.AsQueryable().First(o => o._id == Session["ID"]);
user.Teams.Add(new Team { TeamID = new ObjectId(), TeamName = "Some Team" });
但是当我这样做时,我得到了这些错误:
1:Instance argument: cannot convert from 'MongoDB.Driver.MongoCollection<SportsFantasy_2._0.Models.User>' to 'System.Collections.IEnumerable'
2:'MongoDB.Driver.MongoCollection<SportsFantasy_2._0.Models.User>' does not contain a definition for 'AsQueryable' and the best extension method overload 'System.Linq.Queryable.AsQueryable(System.Collections.IEnumerable)' has some invalid arguments
答案 0 :(得分:11)
您缺少名称空间MongoDB.Driver.Linq
,只需将其添加到顶部:
using MongoDB.Driver.Linq;
具体方法是:
LinqExtensionMethods
{
public static IQueryable<T> AsQueryable<T>(this MongoCollection<T> collection);
//...
}
答案 1 :(得分:2)
我在使用.NET驱动程序v2.3.0时遇到了同样的错误。我删除它并使用NuGet安装v2.2.4并且它工作正常。我一直得到的错误:
找不到方法:'MongoDB.Driver.Linq.IMongoQueryable 1<!!0> MongoDB.Driver.IMongoCollectionExtensions.AsQueryable(MongoDB.Driver.IMongoCollection
1)'。