Question

我是MongoDB的新手，所以也许这是显而易见的。但谷歌搜索没有用。

我建立了一个全新的MongoDB帐户，用accnt'resizer'和密码'test'创建了一个名为'resizer-test'的数据库。然后，我成功地使用Web界面上传了一个名为'flames.jpg'的图像。

然后我尝试使用以下代码和官方C＃驱动程序（版本1.3.1）从C＃下载文件

string connectionString = "mongodb://resizer:test@staff.mongohq.com:10028/resizer-test";
this.db = MongoDatabase.Create(connectionString);
gridSettings = new MongoGridFSSettings();
grid = db.GetGridFS(gridSettings);
return grid.OpenRead("flames.jpg");

但是立即得到了这个例外：

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)

我错过了什么？

Answer 1

猜猜是什么！错误消息是合法的。

MongoHQ.COM在上传过程中将重复的文件名元素附加到文件中 - 这是他们手动文件管理界面中的一个错误。

MongoDB GridFS错误：重复的元素名称'filename'

1 个答案: