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Version du 20 mars 2024 à 12:47

Access to a collection

var mongoClient = new MongoClient("MONGODB_CONNECTION_STRING");
var database = mongoClient.GetDatabase("DB_NAME");
var collection = database.GetCollection<Collection>("COLLECTION_NAME");

Filter

var builder = Builders<MyClass>.Filter;
FilterDefinition<MyClass> filter = filterDefinition.Empty;

filter &= builder.Eq(x => x.Property1, "id");
filter &= builder.In(x => x.Property1, new[] { "id1", "id2" });  // filter by Property1 equals to one of the ids

var result = (await collection.FindAsync(filter)).ToList();

Pipeline

var stages = new BsonDocument[]
{
    MatchStage(getTimeSeriesQuery),
    ProjectionStage(),
    SortStage()
};
var pipeline = PipelineDefinition<InputClass, OutputClass>.Create(stages);

var results = (await myCollection.AggregateAsync(pipeline)).List();

BsonDocument GetMatchStage(GetTimeSeriesQuery getTimeSeriesQuery)
{
    var match = new BsonDocument("property1", "value1");
    if (!string.IsNullOrEmpty(variable2))
    {
        match.AddRange(
            new BsonDocument("property2", variable2)
        );
    }
}

BsonDocument GetProjectionStage() =>
    new BsonDocument(
        "$project",
        new BsonDocument
        {
            { "_id", 0 },
            { "property1", 1 },
            { "property2", 1 }
        }
    );

BsonDocument GetSortStage() =>
    new BsonDocument("$sort", new BsonDocument("timestamp", 1));

Log

var mongoUrl = new MongoUrl("MONGODB_CONNECTION_STRING");
var mongoClientSettings = MongoClientSettings.FromUrl(mongoUrl);
mongoClientSettings.ClusterConfigurator = cb =>
{
    cb.Subscribe<CommandStartedEvent>(e =>
    {
        logger.LogTrace($"{e.CommandName} - {e.Command.ToJson()}");
    });
};
this.mongoClient = new MongoClient(mongoClientSettings);

Configure the Log so it will be displayed in Visual Studio Output Debug window.