先在NuGet中下载并安装驱动mongocsharpdriver，和客户端包MongoDB.Driver

代码如下

using MongoDB.Bson;
using MongoDB.Bson.Serialization;
using MongoDB.Driver;
using MongoDB.Driver.Builders;

namespace TestMongoDB
{
    [Serializable]
    class Customer
    {
        public int id { set; get; }
        public string name { set; get; }
        public int age { set; get; }
    }

    class Program
    {
        public static void Main()
        {
			MongoClient client;
			MongoServer server;
			client = new MongoClient("mongodb://admin:Abc12345@localhost:27017/admin");
			if (client != null)
            {
                Console.WriteLine("MongoDB connect success.");

				server = client.GetServer();
				MongoDatabase mdb = server.GetDatabase("foo");
				MongoCollection<BsonDocument> collection = mdb.GetCollection("bar");

				// Select operation
				var records = collection.FindAll();
				foreach (BsonDocument record in records)
                {
                    Console.WriteLine(record);
                }

				// Insert operation
				Customer customer = new Customer
				{
					id = 8,
					name = "zahngsan",
					age = 28
				};
				collection.Insert<Customer>(customer);
				
				// Update operation
				IMongoQuery iq4u = Query.EQ("name", "zhangsan_1");
				IMongoUpdate iu = Update.Set("name", "zhangsan").Set("age", 98);
				collection.Update(iq4u, iu, UpdateFlags.Multi);

				// Delete operation
				IMongoQuery iq4d = Query.EQ("name", "zhangsan_2");
				collection.Remove(iq4d);

				// Select as Object
				/*MongoCollection<Customer> collection2 = mdb.GetCollection<Customer>("bar");
				var customer1 = collection2.FindOne();
				var customer2 = collection2.FindOneAs<Customer>();
				foreach (BsonDocument record in records)
				{
					var customer3 = BsonSerializer.Deserialize<Customer>(record);
				}*/
			}
			else
            {
                Console.WriteLine("MongoDB connect fail.");
            }
        }
	}
}