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場景：我最近添加了一個組件到我的ASP.NET MVC應用程序，允許他們將文件上傳到數據庫中。由於這些文件平均超過2MB，我選擇使用FILESTREAM。我將HttpPostedFileBase保存爲臨時文件，執行一些業務邏輯，然後上載文件。上傳後，用戶將被重定向到一個頁面，該頁面在瀏覽器中內聯查看文件。下面是相關的上傳代碼：SQL FILESTREAM打破
var DocContext = new DocumentEntities();
var dbFile = new File
{
DocumentID = Guid.NewGuid(),
Name = fileName,
Type = file.ContentType
};
DocContext.Document.Add(dbFile);
DocContext.SaveChanges();
using (var scope = new TransactionScope(TransactionScopeOption.Required, new TransactionOptions { IsolationLevel = IsolationLevel.ReadCommitted }))
using (var sqlFS = dbFile.Open(DocContext, FileAccess.Write))
using (var tempFS = tempFile.OpenRead())
{
tempFS.CopyTo(sqlFS);
scope.Complete();
}
下面是相關查看/下載代碼：
public ActionResult File(Guid? id = null)
{
if (id == null)
return RedirectToActionPermanent("Index");
return File(DocContext.Document.Find(id.Value) as File);
}
private ActionResult File(File file)
{
if (file == null)
throw new HttpException(404, "Unknown document type");
var scope = new TransactionScope(TransactionScopeOption.Required, new TransactionOptions { IsolationLevel = IsolationLevel.RepeatableRead });
Disposing += d => { scope.Complete(); scope.Dispose(); };
var fs = file.Open(DocContext, FileAccess.Read);
Disposing += d => fs.Dispose();
return new Misc.InlineFileStreamResult(fs, file.MimeType) { FileDownloadName = file.FileName, Inline = true };
}
和開放的方法：
public partial class File
{
public SqlFileStream Open(DocumentEntities db, FileAccess access)
{
var path = db.Database.SqlQuery<string>(
@"SELECT FileData.PathName() FROM [File] WHERE DocumentID = @docID",
new SqlParameter("docID", DocumentID)).First();
var context = db.Database.SqlQuery<byte[]>(
@"SELECT Get_FILESTREAM_TRANSACTION_CONTEXT() FROM [File] WHERE DocumentID = @docID",
new SqlParameter("docID", DocumentID)).First();
return new SqlFileStream(path, context, access);
}
}
查看以前上傳的文件精美作品。查看用戶上傳的文件（最近？），發生以下異常： The transaction operation cannot be performed because there are pending requests working on this transaction.
發生了什麼事？
更新：我假設因爲我是一個SQL系統管理員，我可以上傳文件並查看他們罰款。