static void InsertOneInMongoDB()
        {
        
            MongoClient client = new MongoClient("mongodb://127.0.0.1:27017");
          
            IMongoDatabase db = client.GetDatabase("TestDb1");
     
            IMongoCollection<Person> persons = db.GetCollection<Person>("Persons");
            IMongoCollection<Dog> dogs = db.GetCollection<Dog>("Dogs");
}

{
            MongoClient client = new MongoClient("mongodb://127.0.0.1:27017");
            IMongoDatabase db = client.GetDatabase("TestDb1");
            IMongoCollection<BsonDocument> dogs = db.GetCollection<BsonDocument>("Dogs");

            string json = "{Name:'大黄',Age:10,Weight:50}";
            BsonDocument d1 = BsonDocument.Parse(json);//解析Json数据
            dogs.InsertOne(d1);

}

 public void DeleteAllPurchases()
        {
            MyShoppingCollection.DeleteMany(FilterDefinition<PurchaseBson>.Empty, null);
        }

public PurchaseBson[] FindPurchases()
        {
            var purchases = MyShoppingCollection.Find(FilterDefinition<PurchaseBson>.Empty, null).ToList();
            return purchases.ToArray();
        }

 public async Task<IActionResult> Update()
        {
            var query = from k in (from a in _context.Books.AsQueryable()
                                    where a.Title == "Test Book 2"
                                    from b in a.Posts
                                    select b)
                         where k.Title == "Second One"
                         select k;
            var result = await query.FirstOrDefaultAsync();
            result.ReadCount = 5;

            _context.Books
                .FindOneAndUpdate(x => x.Title == "Test Book 2" && x.Posts.Any(p => p.Title == "Second One"),
                                    Builders<Book>.Update.Set(x => x.Posts[-1], result));

            return Redirect("/");
        }

class Program
    {
       static void Main(string[] args)
        {
           string template = "mongodb://{0}:{1}@{2}/?replicaSet=rs0&readpreference={3}";
           string username = "root";
           string password = "rootroot";
           string clusterEndpoint = "sample-cluster.cluster-cqjaxx9hbhi0.us-west-2.docdb.amazonaws.com:27017";
           string readPreference = "secondaryPreferred";

           string connectionString = String.Format(template, username, password, clusterEndpoint, readPreference);
           var settings = MongoClientSettings.FromUrl(new MongoUrl(connectionString));
           var client = new MongoClient(settings);

           var database = client.GetDatabase("library");
           var collection = database.GetCollection<BsonDocument>("Books");

           var docToInsert = new BsonDocument { { "title", "Harry Potter" } };
           collection.InsertOne(docToInsert);
        }
    }

 public class CustomerService
    {
        private readonly IMongoCollection<Customer> _customer;
        private readonly DeveloperDatabaseConfiguration _settings;

        public CustomerService(IOptions<DeveloperDatabaseConfiguration> settings)
        {
            _settings = settings.Value;
            var client = new MongoClient(_settings.ConnectionString);
            var database = client.GetDatabase(_settings.DatabaseName);
            _customer = database.GetCollection<Customer>(_settings.CustomerCollectionName);
        }

        public async Task<List<Customer>> GetAllAsync()
        {
            return await _customer.Find(c => true).ToListAsync();
        }
    }

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace WorkingWithMongoDB.WebAPI.Configuration
{
    public class DeveloperDatabaseConfiguration
    {
        public string CustomerCollectionName { get; set; }
        public string ConnectionString { get; set; }
        public string DatabaseName { get; set; }
    }
}

{
  "DeveloperDatabaseConfiguration": {
    "CustomerCollectionName": "Customers",
    "ConnectionString": "mongodb://localhost:27017",
    "DatabaseName": "DevelopmentDatabase"
  },
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    }
  },
  "AllowedHosts": "*"
}