在服务端中可以通过以下代码来取得正确的ActiveSheetViewIndex值:
 
protected void FpSpread1_ActiveSheetChanged(object sender, EventArgs e)

        {

            int index = FpSpread1.ActiveSheetViewIndex;

        }

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在客户没有提供现成的ActiveSheetViewIndex属性,不过通过以下代码可以取到当前的ActiveSheetViewIndex值:
后台代码
 
protected override void Render(HtmlTextWriter writer)

        {

            WebControl c = FpSpread1.FindControl("viewport") as WebControl;

            c.Attributes.Add("ActiveSheet", FpSpread1.ActiveSheetViewIndex.ToString());

            base.Render(writer);

        }

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前台代码
 
<script language="javascript" type="text/javascript">

            var ss;



            function window.onload() {

                ss = document.getElementById("FpSpread1");

                ss.onCallBackStopped = MyFunction;

            }



            function MyFunction() {

                var viewport;

                viewport = document.getElementById("FpSpread1_viewport");

                alert(viewport.getAttribute("ActiveSheet"));

            }

    </script>

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