在服务端中可以通过以下代码来取得正确的ActiveSheetViewIndex值：
后台代码
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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