[RuntimeBinderException: 无法对 null 引用执行运行时绑定]
CallSite.Target(Closure , CallSite , Object ) +200
System.Dynamic.UpdateDelegates.UpdateAndExecute1(CallSite site, T0 arg0) +550
CallSite.Target(Closure , CallSite , Object ) +349
ASP.single_aspx.__Render__control1(HtmlTextWriter __w, Control parameterContainer) in d:\wwwroot\1718jc\web\single.aspx:6
System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +131
System.Web.UI.Page.Render(HtmlTextWriter writer) +40
System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +150
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5087
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