消息类型：EntityException
消息内容：基础提供程序在 Open 上失败。
引发异常的方法：Void OpenStoreConnectionIf(Boolean, System.Data.Common.DbConnection, System.Data.Common.DbConnection, System.String, System.String, Boolean ByRef)
引发异常源：System.Data.Entity 在 System.Data.EntityClient.EntityConnection.OpenStoreConnectionIf(Boolean openCondition, DbConnection storeConnectionToOpen, DbConnection originalConnection, String exceptionCode, String attemptedOperation, Boolean& closeStoreConnectionOnFailure)
在 System.Data.EntityClient.EntityConnection.Open()
在 System.Data.Objects.ObjectContext.EnsureConnection()
在 System.Data.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption)
在 System.Data.Objects.ObjectQuery`1.System.Collections.Generic.IEnumerable.GetEnumerator()
在 System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source)
在 AutoWebSite10.DoClass.ChannelDo.Read(Int32 id)
在 AutoWebSite10.PageClass.Site.NavPage(String table, Int32 id)
在 AutoWebSite10.DoClass.Navigation..ctor(Nullable`1 parentId, Boolean isChannel, String navIdPre, Boolean idPosition)
在 AutoWebSite10.Pages.NavMain()
在 ASP.pages_master.__Renderform1(HtmlTextWriter __w, Control parameterContainer)
在 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
在 System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer)
在 System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer)
在 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
在 System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer)
在 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
在 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
在 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children)
在 System.Web.UI.Page.Render(HtmlTextWriter writer)
在 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter)
在 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)