using MongoDB.Bson;
using MongoDB.Driver;

var client = new MongoClient("mongodb://127.0.0.1:27017");
      var database = client.GetDatabase("foo");
      var collection = database.GetCollection<object>("app");
      var document = new
      {
        name="添加到mongodb"
      };
      var a= collection.AsQueryable<object>();//查询
      Console.WriteLine(a.Count());
      collection.InsertOne(document);//添加一条数据