“/”应用程序中的服务器错误。

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行 42:             var fn = this.Server.MapPath(@"~/App_Data/ViewState/" + viewStateID);
行 43:             //ThreadPool.QueueUserWorkItem(File.WriteAllText(fn, value));
行 44:             File.WriteAllText(fn, value);
行 45:             Cache.Insert(viewStateID, value);
行 46:             base.SavePageStateToPersistenceMedium(viewStateID);

[DirectoryNotFoundException: 未能找到路径“D:\wwwroot\quanwujiaju\PC\App_Data\ViewState\638490851901312268”的一部分。]
   System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath) +281
   System.IO.FileStream.Init(String path, FileMode mode, FileAccess access, Int32 rights, Boolean useRights, FileShare share, Int32 bufferSize, FileOptions options, SECURITY_ATTRIBUTES secAttrs, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost) +1242
   System.IO.FileStream..ctor(String path, FileMode mode, FileAccess access, FileShare share, Int32 bufferSize, FileOptions options, String msgPath, Boolean bFromProxy, Boolean useLongPath, Boolean checkHost) +146
   System.IO.StreamWriter.CreateFile(String path, Boolean append, Boolean checkHost) +126
   System.IO.StreamWriter..ctor(String path, Boolean append, Encoding encoding, Int32 bufferSize, Boolean checkHost) +105
   System.IO.File.InternalWriteAllText(String path, String contents, Encoding encoding, Boolean checkHost) +83
   System.Web.UI.BasePage.SavePageStateToPersistenceMedium(Object state) in D:\wwwroot\quanwujiaju\PC\App_Code\BasePage.cs:44
   System.Web.UI.Page.SaveAllState() +924
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +4015