/// <summary>
/// 下载成流
/// </summary>
/// <param name="filename">文件名</param>
/// <returns></returns>
public Stream DownloadToStreamByName(string filename)
{
Stream destination = new MemoryStream();
bucket.DownloadToStreamByName(filename, destination);
return(destination);
}
public Stream Download()
{
DownloadResponse response = new DownloadResponse()
{
FileName = SysConfig.FileName,
Stream = new MemoryStream()
};
try
{
// open DB client and get DB reference
var client = new MongoClient(SysConfig.DBconn);
var database = client.GetDatabase("da_pp_db");
// download file as stream
var bucket = new GridFSBucket(database);
bucket.DownloadToStreamByName(response.FileName, response.Stream);
// return the stream
//response.Errored = false;
//response.Message = "Stream initiated";
return(response.Stream);
}
catch (Exception ex)
{
return(null);
}
}
public void DownloadToStreamByName(string fileName, Stream source, GridFSDownloadByNameOptions options = null)
{
MongoClient client = GetClient(m_connectionStr);
var db = client.GetDatabase(DatabaseName);
var bucket = new GridFSBucket(db, BucksOptions);
bucket.DownloadToStreamByName(fileName, source, options);
}
/// <summary>
/// 根据文件名下载文件
/// </summary>
/// <param name="filepath">保存文件的完整路径</param>
/// <param name="fileName">文件名（不含扩展名）</param>
/// <param name="collectionName">mongodb集合名</param>
public void DownLoadFileByName(string filepath, string fileName, string collectionName)
{
FileStream fileStream = new FileStream(filepath, FileMode.Append);
var bucket = new GridFSBucket(this.MongoDatabase, new GridFSBucketOptions
{
BucketName = collectionName,
ChunkSizeBytes = 358400,
WriteConcern = WriteConcern.WMajority,
ReadPreference = ReadPreference.Secondary
});
var options = new GridFSDownloadByNameOptions
{
Revision = 0
};
bucket.DownloadToStreamByName(fileName, fileStream, options);
fileStream.Close();
}