原文：http://support.microsoft.com/?id=909455
在 wss v2 sp2(moss2003) 中以及之后的版本都会出现这个错误
wss sp2 的安全性被增强了，所以会出现这样的异常信息：
Microsoft.SharePoint.SPException: Cannot complete this action. Please try again. ---> System.Runtime.InteropServices.COMException (0x80004005): Cannot complete this action. Please try again. at Microsoft.SharePoint.Library.SPRequestInternalClass.CalculatePermissionsForCurrentThread(Object& pvarAcl, Boolean bOnlyAces, UInt64& pPermGrant, UInt64& pPermDeny, Boolean& pbIsSiteAdmin, Boolean& pbIsSiteAuditor) at Microsoft.SharePoint.Library.SPRequest.CalculatePermissionsForCurrentThread(Object& pvarAcl, Boolean bOnlyAces, UInt64& pPermGrant, UInt64& pPermDeny, Boolean& pbIsSiteAdmin, Boolean& pbIsSiteAuditor) --- End of inner exception stack trace ---
解决办法：
using System.Security.PrincipalWindowsImpersonationContext wic = WindowsIdentity.GetCurrent().Impersonate(); // implement OM code here wic.Undo(); 这个问题困扰了我好几天了，昨天去驾校领完本，下午心惊胆战的过了一下车隐，晚上又心情大好的穿齐了8件T6。今天早上又顺利的 Google 到微软的 KB。啊哈哈，这两天实在是好日子呀。转载于:https://www.cnblogs.com/eclairs/archive/2009/02/26/1398489.html
