I'm unable to successfully execute any run commands using the new C Sharp driver. We previously used the C Sharp driver V1.1. Similar commands worked properly in that environment. In addition I'm also using the MongoDB Java driver V3.6.3. The exact same commands work properly via RunCommand.

Here is the simplified VB source I'm using.
Dim _oClient As MongoClient = Nothing
Dim _oDatabase As MongoDatabase = Nothing
Dim _oCommandResult As CommandResult = Nothing
_oClient = New MongoClient("connstring")
_oDatabase = _oClient.GetServer().GetDatabase(New MongoUrl("connstring").DatabaseName)
Dim sCommand As String = "{aggregate:""restaurants"", pipeline:[{$group:{_id:""$borough"",borough:{$sum:1}}}]}"
_oCommandResult = _oDatabase.RunCommand(sCommand)

Here is the stacktrace that results. What is wrong? I get "no such command" messages no matter what syntax I try.

Thanks in advance,
Clifton Sothoron of Logi Analytics

Command {aggregate:"restaurants", pipeline:[{$group:{_id:"$borough",borough:{$sum:1}}}]} failed: no such command: '{aggregate:"restaurants", pipeline:[{$group:{_id:"$borough",borough:{$sum:1}}}]}', bad cmd: '{ {aggregate:"restaurants", pipeline:[{$group:{_id:"$borough",borough:{$sum:1}}}]}: 1 }'.
Source:
MongoDB.Driver.Core
Stack Trace:
at MongoDB.Driver.Core.WireProtocol.CommandWireProtocol`1.ProcessReply(ConnectionId connectionId, ReplyMessage`1 reply) in C:\work\rstam\mongo-csharp-driver-v2.5.0\src\MongoDB.Driver.Core\Core\WireProtocol\CommandWireProtocol.cs:line 189

at MongoDB.Driver.Core.WireProtocol.CommandWireProtocol`1.Execute(IConnection connection, CancellationToken cancellationToken) in C:\work\rstam\mongo-csharp-driver-v2.5.0\src\MongoDB.Driver.Core\Core\WireProtocol\CommandWireProtocol.cs:line 154

at MongoDB.Driver.Core.Servers.Server.ServerChannel.ExecuteProtocol[TResult](IWireProtocol`1 protocol, CancellationToken cancellationToken) in C:\work\rstam\mongo-csharp-driver-v2.5.0\src\MongoDB.Driver.Core\Core\Servers\Server.cs:line 728

at MongoDB.Driver.Core.Servers.Server.ServerChannel.Command[TResult](ICoreSession session, ReadPreference readPreference, DatabaseNamespace databaseNamespace, BsonDocument command, IElementNameValidator commandValidator, BsonDocument additionalOptions, Func`1 responseHandling, Boolean slaveOk, IBsonSerializer`1 resultSerializer, MessageEncoderSettings messageEncoderSettings, CancellationToken cancellationToken) in C:\work\rstam\mongo-csharp-driver-v2.5.0\src\MongoDB.Driver.Core\Core\Servers\Server.cs:line 362

at MongoDB.Driver.Core.Operations.CommandOperationBase`1.ExecuteProtocol(IChannelHandle channel, ICoreSessionHandle session, ReadPreference readPreference, CancellationToken cancellationToken) in C:\work\rstam\mongo-csharp-driver-v2.5.0\src\MongoDB.Driver.Core\Core\Operations\CommandOperationBase.cs:line 152

at MongoDB.Driver.Core.Operations.CommandOperationBase`1.ExecuteProtocol(IChannelSource channelSource, ICoreSessionHandle session, ReadPreference readPreference, CancellationToken cancellationToken) in C:\work\rstam\mongo-csharp-driver-v2.5.0\src\MongoDB.Driver.Core\Core\Operations\CommandOperationBase.cs:line 182

at MongoDB.Driver.Core.Operations.WriteCommandOperation`1.Execute(IWriteBinding binding, CancellationToken cancellationToken) in C:\work\rstam\mongo-csharp-driver-v2.5.0\src\MongoDB.Driver.Core\Core\Operations\WriteCommandOperation.cs:line 57

at MongoDB.Driver.OperationExecutor.ExecuteWriteOperation[TResult](IWriteBinding binding, IWriteOperation`1 operation, CancellationToken cancellationToken) in C:\work\rstam\mongo-csharp-driver-v2.5.0\src\MongoDB.Driver\OperationExecutor.cs:line 44

at MongoDB.Driver.MongoDatabase.ExecuteWriteOperation[TResult](IClientSessionHandle session, IWriteOperation`1 operation) in C:\work\rstam\mongo-csharp-driver-v2.5.0\src\MongoDB.Driver.Legacy\MongoDatabase.cs:line 1052

at MongoDB.Driver.MongoDatabase.RunCommandAs[TCommandResult](IClientSessionHandle session, IMongoCommand command, IBsonSerializer`1 resultSerializer, ReadPreference readPreference) in C:\work\rstam\mongo-csharp-driver-v2.5.0\src\MongoDB.Driver.Legacy\MongoDatabase.cs:line 1084

at MongoDB.Driver.MongoDatabase.RunCommandAs[TCommandResult](IClientSessionHandle session, IMongoCommand command, ReadPreference readPreference) in C:\work\rstam\mongo-csharp-driver-v2.5.0\src\MongoDB.Driver.Legacy\MongoDatabase.cs:line 923

at MongoDB.Driver.MongoDatabase.<>c_DisplayClass71_0`1.b_0(IClientSessionHandle session) in C:\work\rstam\mongo-csharp-driver-v2.5.0\src\MongoDB.Driver.Legacy\MongoDatabase.cs:line 913

at MongoDB.Driver.MongoDatabase.UsingImplicitSession[TResult](Func`2 func) in C:\work\rstam\mongo-csharp-driver-v2.5.0\src\MongoDB.Driver.Legacy\MongoDatabase.cs:line 1110

at rdServer.MongoDBReader.OpenConnection() in C:\ReportDev\VB\rdServer\DataEngine\DataReaders\MongoDBReader.vb:line 853