回发后获得价值 [英] Get Value After Postback Time

问题描述

嗨...

我使用One File上传，下拉列表和Button.But Droplist postback属性true我丢失fileupload值..参见此代码。解决方案ME。

 <   asp：ScriptManager     ID   =  ScriptManager1    runat   = 服务器 >  
 <   / asp：ScriptManager  >  
 < span class =code-keyword><   asp：UpdatePanel     ID   =  UpdatePanel1    runat   =  server >  
 <  触发器 >  
 <   asp：AsyncPostBackTrigger     ControlID   =  DropDownList1    EventName     =  DropDownList1_SelectedIndexChanged    /  >  
 <％  - < asp：PostBackTrigger ControlID =   DropDownList1 />  -  ％>  
 < ;   /触发器 >  
 <   ContentTemplate  >  
 <  表    class   =  style1 >  
 <   tr  >  
 <   td  >  
 <   asp：FileUpload     ID   =  FileUpload1    runat   =  server < span class =code-attribute>   /  >  
 <   / td  >  
 <   td  >  
 & nbsp;  
 <   / td  >  
 <   td  > ;  
 & nbsp;  
 <   / td  >  
 <  < span class =code-leadattribute> / tr  >  
 <   tr  >  
 <   td  >  
 <   asp：DropDownList     ID   =  DropDownList1    runat   =  server    AutoPostBack   =  True     OnSelectedIndexChanged   = < span class =code-keyword> DropDownList1_SelectedIndexChanged >  
 <   asp：ListItem  > 选择<   / asp：ListItem  >  
 <   asp：ListItem  >  1 <   / asp：ListItem  >  
 <   asp：ListItem  >  2 <   / asp：ListItem  >  
 < ;   / asp：DropDownList  >  
 <   / td  >  
 <   td  >  
 < span class =code-keyword><   asp：TextBox     ID   =  TextBox1    runat   =  server  >  <   / asp：TextBox  >  
 <   / td  >  
 <   td  >  
 & nbsp;  
 <   / td  >  
 <   / tr  >  
 <   tr  >  
 <   td  >  
 <   asp：按钮    ID   =  Button1    runat   =  server    OnClick   =  Button1_Click   文本  = 按钮 < span class =code-attribute>   /  >  
 <   / td  >  
 <   td  >  
 & nbsp;  
 <   / td  >  
 <   td  >  
 & nbsp;  
 <   / td  >  
 <   / tr  >  
 <   / table  >  
 <   / ContentTemplate  >  
 
  <   / asp：UpdatePanel  >  

解决方案

你不能保留fileupload控件的值，一旦重新加载页面，它将丢失文件名。

 <  触发器 >  
 <   asp：PostBackTrigger     ControlID     =  DropDownList1    /  >  
 < span class =code-keyword><   / Triggers  >  

Hi...
I have use One File upload , Dropdown list and Button.But Droplist postback propertiy true i loss fileupload value..See this code.And Solution ME.

<asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
      <Triggers>
        <asp:AsyncPostBackTrigger ControlID="DropDownList1" EventName ="DropDownList1_SelectedIndexChanged" />
        <%--<asp:PostBackTrigger ControlID ="DropDownList1" />--%>
        </Triggers>
        <ContentTemplate>
           <table class="style1">
                <tr>
                    <td>
                        <asp:FileUpload ID="FileUpload1" runat="server" />
                    </td>
                    <td>
                        &nbsp;
                    </td>
                    <td>
                        &nbsp;
                    </td>
                </tr>
                <tr>
                    <td>
                        <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
                            <asp:ListItem>Select</asp:ListItem>
                            <asp:ListItem>1</asp:ListItem>
                            <asp:ListItem>2</asp:ListItem>
                        </asp:DropDownList>
                    </td>
                    <td>
                        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
                    </td>
                    <td>
                        &nbsp;
                    </td>
                </tr>
                <tr>
                    <td>
                        <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
                    </td>
                    <td>
                        &nbsp;
                    </td>
                    <td>
                        &nbsp;
                    </td>
                </tr>
            </table>
        </ContentTemplate>

    </asp:UpdatePanel>

解决方案

you can not retain the value of fileupload control, once the page is reloaded it will lose the file name.

<Triggers>
         <asp:PostBackTrigger ControlID ="DropDownList1" />
       </Triggers>

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