NET Core Connection MongoDB

Two days ago in learning MongoDB related knowledge, did a small demo, do is the province below how many schools, well, do more rough ...

Connect MongoDB first to add a MongoDB package through NuGet, download this package

Start writing code after installation, create a province entity, a school entity

Using MongoDB.Bson.Serialization.Attributes;
Using System.collections.generic;namespace mongocore.models{public    class province    {        [Bsonid]        public int Provinceid {get; set;}        public string Provincename {get; set;}        <summary>///The        provinces have multiple schools here to save///        </summary> public        ilist<school> Schoolname {get; set;}}}    Namespace mongocore.models{
        Used to add school later
       Public School (String schoolname, String years)
{
Schoolname = Schoolname;
years = years;
Public    class School    {public        string Schoolname {get; set;}        string Years {get; set;}     }}

Create context class, connect MongoDB

namespace mongocore.models{public    class Provincecontext    {        //define Database        private ReadOnly Imongodatabase _ Database = null;        Public Provincecontext ()        {            ///connection server name  MONGO default port 27017            var client = new Mongoclient ("mongodb:// .....: 27017 ");            if (client! = NULL)                //Connect to database                _database = client. Getdatabase ("database name");        }        Public Imongocollection<province> province        {            get            {                return _database. Getcollection<province> ("Province");}}}    

Create a Controller

  Private readonly Provincecontext _context = new Provincecontext ();        Public async task<iactionresult> Index ()        {            var list = await _context. Province.find (_ = = True). Tolistasync ();            return View (list);        }

View

@model list<mongocore.models.province>@{viewdata["Title"] = "Index";} 
When running, modify the configuration in Startup.cs.
The effect is this, and now there is no data,
Click the New button Add province, here I added Hubei province
Add the province code as follows: Back end
   Public Iactionresult Create ()        {            return View ();        }        [HttpPost]        [Validateantiforgerytoken]        Public Async task<actionresult> Create (province Item)        {            try            {                                //Initialize school type data                item. Schoolname = new list<school> ();                                Await _context. Province.insertoneasync (item);                Return Redirecttoaction (nameof (Index));            }            Catch            {                return View ();            }        }
View:
@model mongocore.models.province@{    viewdata["Title"] = "Create";} 
The next step is to add the school below the province.
  
 Public Async task<iactionresult> Insert (int provinceid) {var num = await _context. Province.find (p = P.provinceid = = Provinceid).            Singleordefaultasync ();        return View (num); } [HttpPost] [Validateantiforgerytoken] public async task<iactionresult> Insert (int prov Inceid, string years, String schoolname) {var item = await _context. Province.find (p = P.provinceid = = Provinceid).            Singleordefaultasync ();            School SL = new School (schoolname,years); Add School item.            Schoolname.add (SL); Update Replaceoneresult ActionResult = await _context. Province.                                       Replaceoneasync (n = n.provinceid.equals (Provinceid), item            , new UpdateOptions {Isupsert = true});        Return Redirecttoaction (nameof (Index)); }
View:
@model mongocore.models.province@{    viewdata["Title"] = "Insert";} 
Then add the school, I added two schools, in MongoDB can see the data
NET Core Connection MongoDB