<asp:Button runat="server" ID="hiddenPopupPatientRegistration" Style="display: none" />
    <asp:ModalPopupExtender ID="popupPatientRegistration" runat="server" PopupControlID="panelPatientRegistration"
        TargetControlID="hiddenPopupPatientRegistration" BackgroundCssClass="cssmodalbackground"
        BehaviorID="modalBehaviour" CancelControlID="btnClose">
    </asp:ModalPopupExtender>
    <div id="panelPatientRegistration" class="cssmodalpopup" style="display: none">
        <iframe id="iframePatientRegistration"  class="csstable" runat="server" width="600px"
            height="485px" scrolling="auto"></iframe>
        <table>
            <tr>
                <td align="right">
                    <asp:Button ID="btnClose" runat="server" CssClass="cssbutton" Text="Close" />
                </td>
            </tr>
        </table>
    </div>
    protected void btn_Click(object sender, EventArgs e)
    {
          iframePatientRegistration.Attributes["src"] = "Patient_Registration.aspx?flowType=" + flowType + "&fromTime=" + hidFromTime.Value + "&toTime=" + hidToTime.Value + "&acqModalityID=" + hidAcqModalityID.Value + "&schLocationID=" + ddlScheduledProcedureStepLocation.SelectedValue;
            popupPatientRegistration.Show();
    }
我必须在模式弹出扩展器控件中显示 aspx 页面。并通过查询字符串传递值,但 ASPX 页面未加载到 Iframe.code 后面。
当我看到 html 源代码然后得到这两行
<HTML>
</HTML>