Question

如何使用Mongo C＃Driver列出连接的所有数据库？

Answer 1

很容易：

var server = MongoServer.Create("mongodb://localhost/?safe=true");
var databaseNames = server.GetDatabaseNames();

Answer 2

在2.0.0版本中不推荐使用MongoServer类。

您可以使用ListDatabasesAsync

using (var cursor = await client.ListDatabasesAsync())
{
    await cursor.ForEachAsync(d => Console.WriteLine(d.ToString()));
}

Answer 3

工作解决方案：

MongoClient client = new MongoClient("mongodb://localhost:27017");
using (IAsyncCursor<BsonDocument> cursor = client.ListDatabases())
{
    while (cursor.MoveNext())
    {
        foreach (var doc in cursor.Current)
        {
            Console.WriteLine(doc["name"]); // database name
        }
    }
}

Answer 4

Juri指出，版本2.0.0中不推荐使用MongoServer类。如果您不想使用异步，请按以下步骤操作：

var client = new MongoClient("mongodb://" + server_username + ":" + server_password + "@" + server_host + ":" +  server_port);

List<MongoDB.Bson.BsonDocument> databases = client.ListDatabases();

只有一件事。它采用BsonDocument格式，有2个元素：＆＃34; name＆＃34;和＆＃34; sizeOnDisk＆＃34;。

希望这有帮助。

Answer 5

我无法验证给定数据库是否存在现有答案，所以这是我对它的看法：

    // extension method on IMongoClient
    public static IMongoClient AssertDbExists(this IMongoClient client, string dbName)
    {
        bool dbFound = false;

        using(var cursor = client.ListDatabases())
        {
            var databaseDocuments = cursor.ToList();
            foreach (var db in databaseDocuments)
            {
                if (db["name"].ToString().Equals(dbName))
                {
                    dbFound = true;
                    break;
                }
            }
        }

        if (!dbFound) throw new ArgumentException("Can't connect to a specific database with the information provided", nameof(MongoSettings.ConnectionString));

        return client;
    }

然后像这样使用它：

// either you get the client with the DB validated or throws
_client = new MongoClient(settings.ConnectionString).AssertDbExists(_dbName);

使用： Mongo官方C＃驱动程序v2.4.4

MongoDB：获取所有数据库的列表？

5 个答案: