DropDownList控件刷新问题

Question

我在页面上加了UpdatePanel,但是只要DropDownList加上事件之后，还是一直刷新。
有什么办法可以不然控件刷新吗？ListBox也是这样。
我的代码：
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    <div style="margin: 5px 5px 5px 5px;">
        <asp:UpdatePanel ID="UpdatePanel1" runat="server">
            <ContentTemplate>
                <table width="100%" border="0" cellpadding="0" cellspacing="0">
                     <tr>
                        <td>
                            Department:
                            <asp:DropDownList ID="DDL_DepartmentName" runat="server" Width="150px" Height="20px" AutoPostBack="true" OnSelectedIndexChanged="DDL_DepartmentName_SelectedIndexChanged">
                            </asp:DropDownList> 
                        <td>
                     </tr>
                     <tr>
                         <td>
                             Role:<asp:ListBox ID="lb_AllUser" SelectionMode="Multiple" runat="server" Height="300px" Width="140px" DataValueField="UId" DataTextField="Content" OnSelectedIndexChanged="lb_User_SelectedIndexChanged" AutoPostBack="True"></asp:ListBox>
                         </td>
                    </tr>
                </table>
            </ContentTemplate>
        </asp:UpdatePanel>
    </div>

Answer 1

AutoPostBack= "false"就不刷新了

Answer 2

UpdatePanel包错地方了
<table   width= "100% "   border= "0 "   cellpadding= "0 "   cellspacing= "0 ">
                                          <tr>
                                                <td> 
<asp:UpdatePanel   ID= "UpdatePanel1 "   runat= "server ">
                        <ContentTemplate> 
<asp:DropDownList   ID= "DDL_DepartmentName "   runat= "server "   Width= "150px "   Height= "20px "   AutoPostBack= "true "   OnSelectedIndexChanged= "DDL_DepartmentName_SelectedIndexChanged ">
                                                        </asp:DropDownList>   
        </ContentTemplate>
                </asp:UpdatePanel>
  <td>
                                          </tr>
                                          <tr>
                                                  <td>
                                                          Role: <asp:ListBox   ID= "lb_AllUser "   SelectionMode= "Multiple "   runat= "server "   Height= "300px "   Width= "140px "   DataValueField= "UId "   DataTextField= "Content "   OnSelectedIndexChanged= "lb_User_SelectedIndexChanged "   AutoPostBack= "True "> </asp:ListBox>
                                                  </td>
                                        </tr>
                                </table> 
UpdatePanel用哪包哪别多包

Answer 3

必须要有事件的，设置了AutoPostBack= "false"，事件就不管用了。

Answer 4

不刷新web怎么传递事件呢。
要么就不刷新，要想把事件传递那就得刷新。
除非你在前台编写javascript

Answer 5

写在ContentTemplate标签外面 UpdatePanel里面 
</ContentTemplate>
            <Triggers>
                <asp:AsyncPostBackTrigger    ControlID="DDL_DepartmentName" />
            </Triggers>
        </asp:UpdatePanel>

Answer 6

那你这样UpdatePanel把你整个DIV包起来
 

Answer 7

</ContentTemplate>
  <Triggers>
  <asp:AsyncPostBackTrigger ControlID="DDL_DepartmentName" />
<asp:AsyncPostBackTrigger ControlID="lb_AllUser " />
  </Triggers>
  </asp:UpdatePanel>这样不就行了嘛