The Art of SQL Server FILESTREAM - Red Gate Software

Chapter 4: FILESTREAM with Entity Framework and LINQ to SQLstatic void ReadItem(int itemId){// Obtain info about the objectusing (NorthPoleEntities e = new NorthPoleEntities()){// This does not cause the BLOB to be read with T-SQL as long as// the BLOB column is in a different object,// or excluded from the model altogether (preferred)Item i = e.Items.SingleOrDefault(itm => itm.ItemID == itemId);if (i != null){Console.WriteLine("Read Item GUID: {0}", i.ItemGuid.ToString());bool OpenedConn = false;try{// Ensure the connection is open before// attempting to start a transaction// NOTE: connection is probably closedif (e.Connection.State != System.Data.ConnectionState.Open){e.Connection.Open();OpenedConn = true;}// There are also ways to use// Systems.Transactions.TransactionScope// to enlist in an existing transaction// at the business logic level if desiredusing (System.Data.Common.DbTransaction tran =e.Connection.BeginTransaction()){// Now read the item using SqlFileStream,// leveraging the stored// procedure that's mapped as a functionGetSqlFileStreamInfo_Result info =e.GetSqlFileStreamInfo(i.ItemID).ToList()[0];// If there is a BLOB, there is a file pathif (!string.IsNullOrEmpty(info.FilePath) &&info.Size > 0){using (MemoryStream ms = new MemoryStream())155