导出excel页面假死
如果是asp.net页面
public override void VerifyRenderingInServerForm(Control control) {}
如果是Sharepoint web part：
<asp:Button ID="btnExportToExcel" runat="server" Text="Export to Excel" onclick="btnExportToExcel_Click" OnClientClick="_spFormOnSubmitCalled = false;_spSuppressFormOnSubmitWrapper=true;" />