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我对MongoDB完全陌生，所以也许这是显而易见的。但谷歌搜索不起作用。MongoDB GridFS错误：重复的元素名称'文件名'
我创建了一个全新的MongoDB帐户，使用accnt'resizer'和密码'test'创建了一个名为'resizer-test'的数据库。然后我使用网页界面成功上传了名为'flames.jpg'的图片。
然后我试着用下面的代码和官方C＃驱动程序下载从C＃中的文件（1.3.1版本）
string connectionString = "mongodb://resizer:[email protected]:10028/resizer-test";
this.db = MongoDatabase.Create(connectionString);
gridSettings = new MongoGridFSSettings();
grid = db.GetGridFS(gridSettings);
return grid.OpenRead("flames.jpg");
但立即得到这个异常：
InvalidOperationException: Duplicate element name 'filename'.
at MongoDB.Bson.BsonDocument.Add(BsonElement element) in C:\work\10gen\mongodb\mongo-csharp-driver\Bson\ObjectModel\BsonDocument.cs:line 452
at MongoDB.Bson.BsonDocument.Deserialize(BsonReader bsonReader, Type nominalType, IBsonSerializationOptions options) in C:\work\10gen\mongodb\mongo-csharp-driver\Bson\ObjectModel\BsonDocument.cs:line 720
at MongoDB.Bson.BsonDocument.ReadFrom(BsonReader bsonReader) in C:\work\10gen\mongodb\mongo-csharp-driver\Bson\ObjectModel\BsonDocument.cs:line 393
at MongoDB.Bson.Serialization.BsonSerializer.Deserialize(BsonReader bsonReader, Type nominalType, IBsonSerializationOptions options) in C:\work\10gen\mongodb\mongo-csharp-driver\Bson\Serialization\BsonSerializer.cs:line 214
at MongoDB.Driver.Internal.MongoReplyMessage`1.ReadFrom(BsonBuffer buffer, IBsonSerializationOptions serializationOptions) in C:\work\10gen\mongodb\mongo-csharp-driver\Driver\Internal\MongoReplyMessage.cs:line 94
at MongoDB.Driver.Internal.MongoConnection.ReceiveMessage[TDocument](BsonBinaryReaderSettings readerSettings, IBsonSerializationOptions serializationOptions) in C:\work\10gen\mongodb\mongo-csharp-driver\Driver\Internal\MongoConnection.cs:line 383
at MongoDB.Driver.MongoCursorEnumerator`1.GetReply(MongoConnection connection, MongoRequestMessage message) in C:\work\10gen\mongodb\mongo-csharp-driver\Driver\Core\MongoCursorEnumerator.cs:line 263
at MongoDB.Driver.MongoCursorEnumerator`1.GetFirst() in C:\work\10gen\mongodb\mongo-csharp-driver\Driver\Core\MongoCursorEnumerator.cs:line 223
at MongoDB.Driver.MongoCursorEnumerator`1.MoveNext() in C:\work\10gen\mongodb\mongo-csharp-driver\Driver\Core\MongoCursorEnumerator.cs:line 126
at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source)
at MongoDB.Driver.GridFS.MongoGridFSFileInfo.Refresh() in C:\work\10gen\mongodb\mongo-csharp-driver\Driver\GridFS\MongoGridFSFileInfo.cs:line 447
at MongoDB.Driver.GridFS.MongoGridFSFileInfo.get_Exists() in C:\work\10gen\mongodb\mongo-csharp-driver\Driver\GridFS\MongoGridFSFileInfo.cs:line 150
at MongoDB.Driver.GridFS.MongoGridFSStream..ctor(MongoGridFSFileInfo fileInfo, FileMode mode, FileAccess access) in C:\work\10gen\mongodb\mongo-csharp-driver\Driver\GridFS\MongoGridFSStream.cs:line 76
at MongoDB.Driver.GridFS.MongoGridFSFileInfo.Open(FileMode mode, FileAccess access) in C:\work\10gen\mongodb\mongo-csharp-driver\Driver\GridFS\MongoGridFSFileInfo.cs:line 408
at MongoDB.Driver.GridFS.MongoGridFSFileInfo.OpenRead() in C:\work\10gen\mongodb\mongo-csharp-driver\Driver\GridFS\MongoGridFSFileInfo.cs:line 416
at MongoDB.Driver.GridFS.MongoGridFS.OpenRead(String remoteFileName) in C:\work\10gen\mongodb\mongo-csharp-driver\Driver\GridFS\MongoGridFS.cs:line 696
at ImageResizer.Plugins.MongoReader.MongoReaderPlugin.MongoVirtualFile.Open() in C:\Users\Administrator\Documents\resizer\Plugins\MongoReader\MongoReaderPlugin.cs:line 79
at ImageResizer.ImageBuilder.GetStreamFromSource(Object source, ResizeSettings settings, Boolean& disposeStream, String& path, Boolean& restoreStreamPosition) in C:\Users\Administrator\Documents\resizer\Core\ImageBuilder.cs:line 253
at ImageResizer.ImageBuilder.LoadImage(Object source, ResizeSettings settings, Boolean restoreStreamPos) in C:\Users\Administrator\Documents\resizer\Core\ImageBuilder.cs:line 135
at ImageResizer.ImageBuilder.BuildJob(ImageJob job) in C:\Users\Administrator\Documents\resizer\Core\ImageBuilder.cs:line 388
at ImageResizer.ImageBuilder.Build(ImageJob job) in C:\Users\Administrator\Documents\resizer\Core\ImageBuilder.cs:line 371
at ImageResizer.ImageBuilder.Build(Object source, Object dest, ResizeSettings settings, Boolean disposeSource, Boolean addFileExtension) in C:\Users\Administrator\Documents\resizer\Core\ImageBuilder.cs:line 357
at ImageResizer.ImageBuilder.Build(Object source, Object dest, ResizeSettings settings, Boolean disposeSource) in C:\Users\Administrator\Documents\resizer\Core\ImageBuilder.cs:line 343
at ImageResizer.ImageBuilder.Build(Object source, Object dest, ResizeSettings settings) in C:\Users\Administrator\Documents\resizer\Core\ImageBuilder.cs:line 330
at ImageResizer.InterceptModule.<>c__DisplayClass2.<HandleRequest>b__1(Stream stream) in C:\Users\Administrator\Documents\resizer\Core\InterceptModule.cs:line 266
at ImageResizer.Plugins.Basic.NoCacheHandler.ProcessRequest(HttpContext context) in C:\Users\Administrator\Documents\resizer\Core\Plugins\Basic\NoCacheHandler.cs:line 28
at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)
什么时我错过了？