Crie seu primeiro aplicativo .NET Core com o MongoDB Atlas

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dotnet new console --output MongoExample

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Install-Package MongoDB.Driver -Version 2.14.1

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dotnet add package MongoDB.Driver

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using MongoDB.Driver;
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using MongoDB.Bson;
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MongoClient client = new MongoClient("ATLAS_URI_HERE");
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List<string> databases = client.ListDatabaseNames().ToList();
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foreach(string database in databases) {
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    Console.WriteLine(database);
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}

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using MongoDB.Bson;
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public class Playlist {
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    public ObjectId _id { get; set; }
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    public string username { get; set; } = null!;
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    public List<string> items { get; set; } = null!;
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    public Playlist(string username, List<string> movieIds) {
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        this.username = username;
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        this.items = movieIds;
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    }
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}

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{
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    "_id": ObjectId("61d8bb5e2d5fe0c2b8a1007d"),
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    "username": "nraboy",
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    "items": [ "1234", "5678" ]
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}

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using MongoDB.Bson;
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using MongoDB.Bson.Serialization.Attributes;
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public class Playlist {
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    public ObjectId _id { get; set; }
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    [BsonElement("username")]
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    public string user { get; set; } = null!;
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    public List<string> items { get; set; } = null!;
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    public Playlist(string username, List<string> movieIds) {
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        this.user = username;
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        this.items = movieIds;
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    }
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}

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using MongoDB.Driver;
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MongoClient client = new MongoClient("ATLAS_URI_HERE");
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var playlistCollection = client.GetDatabase("sample_mflix").GetCollection<Playlist>("playlist");
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List<string> movieList = new List<string>();
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movieList.Add("1234");
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playlistCollection.InsertOne(new Playlist("nraboy", movieList));

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// Previous code here ...
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FilterDefinition<Playlist> filter = Builders<Playlist>.Filter.Eq("username", "nraboy");
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List<Playlist> results = playlistCollection.Find(filter).ToList();
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foreach(Playlist result in results) {
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    Console.WriteLine(string.Join(", ", result.items));
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}

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// Previous code here ...
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FilterDefinition<Playlist> filter = Builders<Playlist>.Filter.Eq("username", "nraboy");
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// Previous code here ...
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UpdateDefinition<Playlist> update = Builders<Playlist>.Update.AddToSet<string>("items", "5678");
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playlistCollection.UpdateOne(filter, update);
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results = playlistCollection.Find(filter).ToList();
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foreach(Playlist result in results) {
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    Console.WriteLine(string.Join(", ", result.items));
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}

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// Previous code here ...
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FilterDefinition<Playlist> filter = Builders<Playlist>.Filter.Eq("username", "nraboy");
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// Previous code here ...
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playlistCollection.DeleteOne(filter);

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using MongoDB.Driver;
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MongoClient client = new MongoClient("ATLAS_URI_HERE");
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var playlistCollection = client.GetDatabase("sample_mflix").GetCollection<Playlist>("playlist");
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List<string> movieList = new List<string>();
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movieList.Add("1234");
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playlistCollection.InsertOne(new Playlist("nraboy", movieList));
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FilterDefinition<Playlist> filter = Builders<Playlist>.Filter.Eq("username", "nraboy");
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List<Playlist> results = playlistCollection.Find(filter).ToList();
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foreach(Playlist result in results) {
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    Console.WriteLine(string.Join(", ", result.items));
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}
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UpdateDefinition<Playlist> update = Builders<Playlist>.Update.AddToSet<string>("items", "5678");
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playlistCollection.UpdateOne(filter, update);
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results = playlistCollection.Find(filter).ToList();
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foreach(Playlist result in results) {
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    Console.WriteLine(string.Join(", ", result.items));
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}
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playlistCollection.DeleteOne(filter);