[InvalidCastException: 对象不能从 DBNull 转换为其他类型。]
System.DBNull.System.IConvertible.ToInt32(IFormatProvider provider) +52
System.Convert.ToInt32(Object value) +30
Dowork.dnum.Page_Load(Object sender, EventArgs e) +1559
System.Web.UI.Control.OnLoad(EventArgs e) +95
System.Web.UI.Control.LoadRecursive() +59
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +678
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