組裝FileLoadException（訪問被拒絕）在一段時間後

Question

我有一段時間（幾天）正常工作的Web應用程序，然後在實例化引用外部DLL的類時開始拋出FileLoadException。

• 我沒有顯式加載程序集與任何程序集靜態方法。我只是實例化一個類，它自己實例化引用庫中的類。
• 我運行進程監視器，並只監視應用程序路徑。我只收到發生錯誤的源代碼文件的「PATH NOT FOUND」結果（在調試模式下編譯，所以我認爲這只是.NET的一部分，試圖顯示轉儲堆棧跟蹤時發生錯誤的行）
• 這是在內部的專用服務器上運行。該應用程序運行在.NET 3.5應用程序池以及使用相同引用的dll創建的另一個網站上。另一個網站有更多的流量，但從來沒有得到這個錯誤。
• 該應用程序在3個Web服務器之間進行負載均衡，所有3個服務器都在某個時間點出現此問題。

我打開了其中一個Web服務器上的程序集綁定日誌記錄。這裏是堆棧跟蹤的樣子：

System.Web.HttpUnhandledException: Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.IO.FileLoadException: Could not load file or assembly 'Project.Library, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. Access is denied. 
File name: 'Project.Library, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' 
    at ... 
    at System.Web.UI.Control.OnLoad(EventArgs e) 
    at System.Web.UI.Control.LoadRecursive() 
    at System.Web.UI.Control.LoadRecursive() 
    at System.Web.UI.Control.LoadRecursive() 
    at System.Web.UI.Control.LoadRecursive() 
    at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) 

Assembly manager loaded from: C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\mscorwks.dll 
Running under executable c:\windows\system32\inetsrv\w3wp.exe 
--- A detailed error log follows. 

=== Pre-bind state information === 
LOG: User = Unknown 
LOG: DisplayName = Project.Library, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null 
(Fully-specified) 
LOG: Appbase = file:///C:/websites/ProjectPath/ 
LOG: Initial PrivatePath = C:\websites\ProjectPath\bin 
Calling assembly : WebApp, Version=1.0.3723.37743, Culture=neutral, PublicKeyToken=null. 
=== 
LOG: This bind starts in default load context. 
LOG: Using application configuration file: C:\websites\ProjectPath\web.config 
LOG: Using host configuration file: \\?\c:\windows\microsoft.net\framework\v2.0.50727\aspnet.config 
LOG: Using machine configuration file from C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\config\machine.config. 
LOG: Policy not being applied to reference at this time (private, custom, partial, or location-based assembly bind). 
LOG: Attempting download of new URL file:///C:/WINDOWS/Microsoft.NET/Framework/v2.0.50727/Temporary ASP.NET Files/root/d77c161e/8751390/Project.Library.DLL. 
LOG: Attempting download of new URL file:///C:/WINDOWS/Microsoft.NET/Framework/v2.0.50727/Temporary ASP.NET Files/root/d77c161e/8751390/Project.Library/Project.Library.DLL. 
LOG: Attempting download of new URL file:///C:/websites/ProjectPath/bin/Project.Library.DLL. 
ERR: Failed to complete setup of assembly (hr = 0x80070005). Probing terminated. 

    --- End of inner exception stack trace --- 
    at System.Web.UI.Page.HandleError(Exception e) 
    at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) 
    at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) 
    at System.Web.UI.Page.ProcessRequest() 
    at System.Web.UI.Page.ProcessRequestWithNoAssert(HttpContext context) 
    at System.Web.UI.Page.ProcessRequest(HttpContext context) 
    at ASP.myaccount_home_aspx.ProcessRequest(HttpContext context) 
    at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() 
    at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) 

我不是很熟悉的調試文件加載異常，因此任何幫助是極大的讚賞（還有什麼我可以做調試等）。

謝謝。

Answer 1

可能您在Web.config中啓用了模擬。如果假冒並非真的必要，請將其關閉。否則，您需要使用C：\ WINDOWS \ Microsoft.NET \ Framework \ v2.0.50727 \ Temporary ASP.NET Files文件夾上的權限執行一些操作，以允許您的模擬用戶訪問該文件夾中的程序集。

Answer 2

當我將框架2的服務升級到框架4並啓用了模擬時，我遇到了同樣的異常。更新clent服務引用修復了這個異常。