public static MongoDatabase GetDataBase(){//MongoDB 服务器地址var client = new MongoClient(Config.BasicConfig.DbAddress);var server = client.GetServer();//MongoDb 数据库名称return server.GetDatabase(Config.BasicConfig.DbName);}

//访问一个名为test的文件集合或表，如果没有，则自动创建
DbHelper.GetDataBase().GetGridFS(new MongoGridFSSettings { Root = "Test"});
//获取默认的集合或表“fs”
DbHelper.GetDataBase().GridFS;

//huo de wen jian ji he
var fs = DbHelper.GetDataBase().GetGridFS(new MongoGridFSSettings { Root = fileType });
//chuang jian wen jian shu xing , zhi jie shang chuan de wen jian mei you ContentType shu xing , xu yao shou dong zhi ding
var op = new MongoDB.Driver.GridFS.MongoGridFSCreateOptions { ContentType = contentType };
//wen jian shang chuan
var fileInfo = fs.Upload(stream, filename, op);

//获取文件
public FileItem GetFile(string fileNo, string fileType){//组装文件名称var filename = string.Format("{0}_{1}", fileType, fileNo);var fs = DbHelper.GetDataBase().GetGridFS(new MongoGridFSSettings{Root = fileType});//根据文件名称，查找文件var fileInfo = fs.FindOne(filename);if (fileInfo != null && fileInfo.Exists){using (var fileStream = fileInfo.Open(FileMode.Open, FileAccess.Read)){var bytes = new byte[fileStream.Length];//读取文件为bytesfileStream.Read(bytes, 0, bytes.Length);return new FileItem {ContentType = fileInfo.ContentType, FileContent = bytes, Filename = fileInfo.Name, MD5 = fileInfo.MD5, Size = fileInfo.Length + "", UploadDate = fileInfo.UploadDate};}}return null;}

//修改文件（覆盖）
public FileItem Upload(string fileNo, string fileType, Stream stream){var filename = string.Format("{0}_{1}", fileType, fileNo);var fs = DbHelper.GetDataBase().GetGridFS(new MongoGridFSSettings { Root = fileType });var oldFileInfo = fs.FindOne(filename);if (oldFileInfo != null && oldFileInfo.Exists){var bytes = new byte[stream.Length];stream.Read(bytes, 0, bytes.Length);using (var sw = oldFileInfo.OpenWrite()){sw.Seek(0, SeekOrigin.Begin);sw.Write(bytes, 0, bytes.Length);sw.Flush();oldFileInfo.Refresh();}}return new FileItem { ContentType = oldFileInfo.ContentType, FileContent = null, Filename = oldFileInfo.Name, MD5 = oldFileInfo.MD5, Size = oldFileInfo.Length + "", UploadDate = oldFileInfo.UploadDate };}