[InvalidOperationException: 可为空的对象必须具有一个值。]
System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource) +56
HMsoft.Web.ColumnDetail.Render() +924
HMsoft.Web.ColumnDetail.OnLoad(EventArgs e) +851
System.Web.UI.Control.LoadRecursive() +68
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3785
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