C# 当连接到ActivePivot的XMLA服务器时，Infragistics会启用MD ClassCastException

我正在尝试编辑Infragistics WPF PivotGrid示例，以便它能够连接到ActivePivot沙盒服务器。ActivePivot支持XMLA，我可以使用MS Excel中的“来自Analysis Services”数据源选项连接到同一个沙箱服务器，而不会出现任何问题。我编辑了odc文件，以匹配与下面完全相同的连接字符串，它工作正常

在Infragistics.Samples.WPF项目中的DataSourceAdomdNet.xaml文件中，我将AdomdDataSource替换为以下内容：

        <igOlap:AdomdDataSource x:Key="AdomdDataSource"
                                Database="Sandbox"
                                Cube="EquityDerivativesCube">
            <igOlap:AdomdDataSource.ConnectionSettings>
                <igOlap:AdomdConnectionSettings ConnectionString="Password=admin;Persist Security Info=True;User ID=admin;Initial Catalog=Sandbox;Provider=MSOLAP.4;Persist Security Info=True;Data Source=http://localhost:8080/xmla;MDX Compatibility=1;Safety Options=2;MDX Missing Member Mode=Error" />
            </igOlap:AdomdDataSource.ConnectionSettings>

        </igOlap:AdomdDataSource>

我对ActivePivot很有经验，但对Infragistics/ADOMD.NET不太熟悉。我在使用任何其他XMLA/ADOMD客户端和ActivePivot时从未见过这种类型的错误

有人能帮忙吗

谢谢

InnerException: System.InvalidCastException
   HResult=-2147467262
   Message=Object cannot be cast from DBNull to other types.
   Source=mscorlib
   StackTrace:
        at System.DBNull.System.IConvertible.ToDateTime(IFormatProvider provider)
        at System.Convert.ToDateTime(Object value, IFormatProvider provider)
        at Microsoft.AnalysisServices.AdomdClient.CubeDef.get_LastProcessed()
        at Infragistics.Olap.Adomd.AdomdDataProvider.LoadCubesWorkerDoWork(Object sender, DoWorkEventArgs e)
        at System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e)
        at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)
   InnerException: