文件上传控制不起作用

Posted 2023-02-24

【中文标题】文件上传控制不起作用

【英文标题】：File Upload Control is not working

【发布时间】：2011-07-25 20:31:32

【问题描述】：

文件名和扩展名是空的。请帮忙。

ASPX 文件代码：

<tr>
  <td colspan="3" style="height:0px">
    <div id="trFile" runat="server" class="inlineGridAddAddress">
      <table cellpadding="0" cellspacing="0">
        <tr>
          <td>
            <div class="formFieldName">
              <asp:RequiredFieldValidator ID="reqFile" runat="server"
                  ControlToValidate="fileUpload" ErrorMessage="Please select File"
                  ValidationGroup="Save" CssClass="Validations" ></asp:RequiredFieldValidator>
            </div>
          </td>
        </tr>
        <tr>
          <td>
            <asp:Label ID="lblFile" runat="server">File:</asp:Label>
          </td>
          <td>
            <div>
              <asp:FileUpload ID="fileUpload" runat="server" />
            </div>
          </td>
          <td class="tdformFieldValueLogin" style="width:350px;padding-left:50px">
            <asp:ImageButton ID="btnFileUploadSave" runat="server" ValidationGroup="Save"
                ImageUrl="~/App_Themes/Default/images/update.png" ToolTip="Save"
                Height="18px" onclick="btnFileUploadSave_Click"/>
            <asp:ImageButton ID="btnFileUploadCancel" ImageUrl="~/App_Themes/Default/images/cancel.png"
                runat="server" ToolTip="Cancel" Height="18px" />
          </td>
        </tr>

        <tr>
          <td>
            <div class="formSmallTextAreaName">
              <asp:Label ID="lblDescription" runat="server">Description:</asp:Label>
            </div>
          </td>
          <td>
            <div class="formSmallTextAreaValue">
              <asp:RegularExpressionValidator ID="revNote"
                  runat="server" ControlToValidate="txtDescription"
                  ValidationExpression="^[\s\S]0,4096$"
                  Text="Maximum 4096 characters are allowed."
                  CssClass="Validations" Display="Dynamic">
              </asp:RegularExpressionValidator>
              <asp:TextBox ID="txtDescription"
                  runat="server" CssClass="textEntry1"
                  TextMode="MultiLine" MaxLength="4096" Width="218px">
              </asp:TextBox>
            </div>
          </td>
        </tr>
      </table>
    </div>
  </td>
</tr>

CS 文件代码：

protected void btnFileUploadSave_Click(object sender, ImageClickEventArgs e)
    
        string path = Server.MapPath(".") + "\\Files\\" + this.fileUpload.FileName;
        string fileExtension = System.IO.Path.GetExtension(this.fileUpload.FileName).ToLower();
        if (fileExtension == ".txt" || fileExtension == ".doc" || fileExtension == ".docx" || fileExtension == ".zip" || fileExtension == ".rar" || fileExtension == ".cs" || fileExtension == ".ppt" || fileExtension == ".pdf" || fileExtension == ".html" || fileExtension == ".jpg" || fileExtension == ".gif" || fileExtension == ".bmp" || fileExtension == ".png" || fileExtension == ".tif" || fileExtension == ".rm" || fileExtension == ".mp3" || fileExtension == ".xls")
        
            this.fileUpload.PostedFile.SaveAs(path);
        
    

【问题讨论】：

你在做一个完整的回发吗？ FileUpload 控件在部分回发中不起作用（即在 UpdatePanel 中 - 您需要触发完整回发）。

【参考方案1】：

如果您将 UploadControl 放在 UpdatePanel（Ajax 的东西）中，默认情况下它不会工作。使用更新面板、文件上传控件并使用PostBackTrigger 控件强制postback 仅用于文件上传控件

查看以下链接

File Upload in UpdatePanel, ASP.NET AJAX

【讨论】：

非常感谢您