如何在MongoDB数据库中找到名称中带有特定字符串的所有集合？

Question

I've got a database containing several collections. Some has got a name like "carpenter_title_year_version". Others has got a name like "plumber_title_year_version". How do I set up a filter to retrieve all collections where the string "carpenter" is in the collectionname?

I'm thinking something like:

       var filterBuilder = Builders<GroupEntity>.Filter;
        var projectionBuilder = Builders<GroupEntity>.Projection;
        var collection = Database.GetCollection<GroupEntity>("dbname");
        var filter = filterBuilder.ElemMatch("carpenter..., ?"); //<--- ???
        var projection = projectionBuilder.Exclude("_id");
        var list = await collection.Find(filter).Project(projection).ToListAsync();

Answer 1

There's (and an async version of it)

IAsyncCursor<MongoDB.Bson.BsonDocument> IMongoDatabase.ListCollections(ListCollectionsOptions options = null, CancellationToken cancellationToken = null);

You can use the filter from the collection options to match the collection name.

  // <CAPS INSIDE> are wildcards
  var _client = new MongoClient(@"connection string");
  var _database = _client.GetDatabase("<DATABASE NAME>");
  var bre = new BsonRegularExpression("<YOUR REGEX PATTERN>");
  var copt = new ListCollectionsOptions{ Filter = 
    Builders<BsonDocument>.Filter.Regex ("name", bre )
  };
  var collectionsWithMatchingNames = _database.ListCollections(copt).ToList().Select (col => col["name"]); 

Only then you get your particular collection, like:

foreach (var x in collectionsWithMatchingNames)
     var collection = _database.GetCollection<BsonDocument>(x);