从DocumentDB查询POCO实体

我正在关注Microsoft的这篇博客文章，测试DocumentDB。

我已经创建了一个集合，并通过我的应用程序中的不同POCO类插入了2个文档。它创建了文档，但是我无法将它们过滤回各自的POCO类中。我意识到我正在查询所有集合，因此显然是在检索存储在该集合中的所有文档。

在查询时区分文档的最佳方法是什么，以便我可以按类型分别查询它们？

我可以在类型字段添加到文档中，可以通过获取WHERE type="user"，但我不知道，我不能做SELECT * FROM users与users作为一个文档类型（如果在DocumentDB这样的事情），而不是一个集合。

这是我创建文档的方式：

    var user1= new User()
    {
        UserTypeId = 0,
        UserName = "[email protected]",
        Password = "12345",
        PasswordSalt = "saltyPassword",
        UserStatusId = 1,
        ProfilePhotoKey = "KJSY"
    };
    await DocumentDBRepository<User>.CreateItemAsync(user1);

    var client = new Client()
    {
        ClientName = "client1",
        Secret = "rxPBsIVYya2Jg2ZHPNG8gL0P36TnutiBehvEFgk938M=",
        Title = "Administration Front End Application",
        ApplicationTypeId = 0,
        Active = false,
        RefreshTokenLifeTime = 60,
        AllowedOrigin = "http://localhost:8080",
        AllowedRoles = "admin"
    };
    await DocumentDBRepository<Client>.CreateItemAsync(client);

文档Db存储库类

public static class DocumentDBRepository<T>
{
    //Use the Database if it exists, if not create a new Database
    private static Database ReadOrCreateDatabase()
    {
        var db = Client.CreateDatabaseQuery()
                        .Where(d => d.Id == DatabaseId)
                        .AsEnumerable()
                        .FirstOrDefault();

        if (db == null)
        {
            db = Client.CreateDatabaseAsync(new Database { Id = DatabaseId }).Result;
        }

        return db;
    }

    //Use the DocumentCollection if it exists, if not create a new Collection
    private static DocumentCollection ReadOrCreateCollection(string databaseLink)
    {
        var col = Client.CreateDocumentCollectionQuery(databaseLink)
                          .Where(c => c.Id == CollectionId)
                          .AsEnumerable()
                          .FirstOrDefault();

        if (col == null)
        {
            var collectionSpec = new DocumentCollection { Id = CollectionId };
            var requestOptions = new RequestOptions { OfferType = "S1" };

            col = Client.CreateDocumentCollectionAsync(databaseLink, collectionSpec, requestOptions).Result;
        }

        return col;
    }

    //Expose the "database" value from configuration as a property for internal use
    private static string databaseId;
    private static String DatabaseId
    {
        get
        {
            if (string.IsNullOrEmpty(databaseId))
            {
                databaseId = ConfigurationManager.AppSettings["database"];
            }

            return databaseId;
        }
    }

    //Expose the "collection" value from configuration as a property for internal use
    private static string collectionId;
    private static String CollectionId
    {
        get
        {
            if (string.IsNullOrEmpty(collectionId))
            {
                collectionId = ConfigurationManager.AppSettings["collection"];
            }

            return collectionId;
        }
    }

    //Use the ReadOrCreateDatabase function to get a reference to the database.
    private static Database database;
    private static Database Database
    {
        get
        {
            if (database == null)
            {
                database = ReadOrCreateDatabase();
            }

            return database;
        }
    }

    //Use the ReadOrCreateCollection function to get a reference to the collection.
    private static DocumentCollection collection;
    private static DocumentCollection Collection
    {
        get
        {
            if (collection == null)
            {
                collection = ReadOrCreateCollection(Database.SelfLink);
            }

            return collection;
        }
    }

    //This property establishes a new connection to DocumentDB the first time it is used, 
    //and then reuses this instance for the duration of the application avoiding the
    //overhead of instantiating a new instance of DocumentClient with each request
    private static DocumentClient client;
    private static DocumentClient Client
    {
        get
        {
            // change policy to ConnectionMode: Direct and ConnectionProtocol: TCP on publishing to AZURE
            if (client == null)
            {
                string endpoint = ConfigurationManager.AppSettings["endpoint"];
                string authKey = ConfigurationManager.AppSettings["authKey"];
                Uri endpointUri = new Uri(endpoint);
                client = new DocumentClient(endpointUri, authKey);
            }

            return client;
        }
    }


    /* QUERY HELPERS */
    public static IEnumerable<T> GetAllItems()
    {
        return Client.CreateDocumentQuery<T>(Collection.DocumentsLink)
            .AsEnumerable();
    }
    public static IEnumerable<T> GetItems(Expression<Func<T, bool>> predicate)
    {
        return Client.CreateDocumentQuery<T>(Collection.DocumentsLink)
            .Where(predicate)
            .AsEnumerable();
    }
    public static async Task<Document> CreateItemAsync(T item)
    {
        return await Client.CreateDocumentAsync(Collection.SelfLink, item);
    }
    public static T GetItem(Expression<Func<T, bool>> predicate)
    {
        return Client.CreateDocumentQuery<T>(Collection.DocumentsLink)
                    .Where(predicate)
                    .AsEnumerable()
                    .FirstOrDefault();
    }

    public static async Task<Document> UpdateItemAsync(string id, T item)
    {
        Document doc = GetDocument(id);
        return await Client.ReplaceDocumentAsync(doc.SelfLink, item);
    }

    private static Document GetDocument(string id)
    {
        return Client.CreateDocumentQuery(Collection.DocumentsLink)
            .Where(d => d.Id == id)
            .AsEnumerable()
            .FirstOrDefault();
    }
}

我正在尝试获得：

    var q = DocumentDBRepository<User>.GetAllItems().ToList();
    var t = DocumentDBRepository<Client>.GetAllItems().ToList();

q应该只包含那些由...创建的用户文档

await DocumentDBRepository<User>.CreateItemAsync(user1);

并且t应该仅包含那些由...创建的客户文档

await DocumentDBRepository<Client>.CreateItemAsync(client1);