1.Web.config配置：
<configuration>
  <connectionStrings>
    <add name="MongoSessionServices" connectionString="mongodb://192.168.2.88:27017" />
  </connectionStrings>
</configuration>
2.建立BaseDal.cs
public class BaseDal
{
    protected static IMongoDatabase MogoDatabase
    {
        get
        {
            return new MongoClient(ConfigurationManager.ConnectionStrings["MongoSessionServices"].ToString()).GetDatabase("数据库名称");
        }
    }

    /// <summary>
    /// MongoDb查询
    /// </summary>
    /// <typeparam name="T">对象名称</typeparam>
    /// <param name="collectionName">表名</param>
    /// <returns></returns>
    protected static IQueryable<T> IQueryableInit<T>(string collectionName) where T : new()
    {
        var colls = MogoDatabase.GetCollection<T>(collectionName);
        var query = from n in colls.AsQueryable() select n;
        return query;
    }
}
3.建立Model
public class Text
{
    //mongodb生成的_id可由下列方式生成
    //[BsonId]
    //public ObjectId Id { get; set; } //时间戳，机器ID，进程ID和序列号组成的12字节值
    [BsonId(IdGenerator = typeof(StringObjectIdGenerator))]
    public string Id { get; set; }  //由字符串组成
    //[BsonId(IdGenerator = typeof(CounterIdGenerator))]
    //public int Id { get; set; } //由数字组成
    [BsonElement("name")]  //mongodb中的名称
    public string Name { get; set; }
}

public class CounterIdGenerator : IIdGenerator
{
    private static int _counter = 0;
    public object GenerateId(object container, object document)
    {
        return _counter++;
    }

    public bool IsEmpty(object id)
    {
        return id.Equals(default(int));
    }
}
4.查询
public class GenericArticle_Dal : BaseDal
{

    public static IQueryable<MongoDB_Models.GenericArticle> GetInit()
    {
        var query = IQueryableInit<MongoDB_Models.GenericArticle>(MongoDB_Models.Collections.GenericArticle);
        return query;
    }
}
static void Main(string[] args)
{
    var list=GenericArticle_Dal.IQueryable<MongoDB_Models.GenericArticle>().ToList();
}
5.多表查询
public class Video_Dal
{
    public static IQueryable<VideoExt> GetInit(IMongoCollection<Video> coll1, IMongoCollection<VideoList> coll2)
    {
        var temp = from n in coll1.AsQueryable()
                   join f in coll2.AsQueryable() on n.ID equals f.ID
                   select new HeavenVideoExt()
                   {
                       Id = n.Id,
                       ModelId = n.ModelId,
                       AddMongoDateTime = n.AddMongoDateTime,
                       ID = n.ID,
                       Title = n.Title,
                       UploadImgPath = n.UploadImgPath,
                       VideoList = f
                   };
        return temp;
    }
}
var colls1 = MogoDatabase.GetCollection<Video>("Video");
var colls2 = MogoDatabase.GetCollection<VideoList>("VideoList");
var list = Video_Dal.GetInit(colls1, colls2).ToList();