FileUpload1.HasFile总是返回false [英] FileUpload1.HasFile is always returning false

问题描述

我使用ASP.net文件上传控件上传文件。
我FileUpload1.HasFile总是返回false。

I am uploading file using ASP.net File upload control. My FileUpload1.HasFile is always returning false.

if (FileUpload1.HasFile)
        {
            DBOperations db = new DBOperations();

            try
            {
                FileUpload1.SaveAs(Server.MapPath("~/uploadedImages/" + db.uploadImage(System.IO.Path.GetExtension(FileUpload1.FileName)) + System.IO.Path.GetExtension(FileUpload1.FileName)));
            }
            catch (Exception Ex)
            {
                String he = Ex.Message;
            }
        }

我使用以下ASP.net code

I am using following ASP.net Code

<asp:UpdatePanel ID="fileUpload" runat="server">
           <ContentTemplate>
             <Triggers>
                  <asp:AsyncPostBackTrigger ControlID="btnUploadFile" EventName="Click" />
             </Triggers>
               <asp:FileUpload ID="FileUpload1" runat="server" /> 
               <asp:Button ID="btnUploadFile" Text="Upload File" runat="server" 
                   onclick="btnUploadFile_Click" />
                   <br />
             <asp:RegularExpressionValidator ID="revImage" ControlToValidate="FileUpload1" ValidationExpression="^.*\.((j|J)(p|P)(e|E)?(g|G)|(g|G)(i|I)(f|F)|(p|P)(n|N)(g|G))$" Text="Invalid image type" runat="server" />

          </ContentTemplate>
       </asp:UpdatePanel>

我甚至通过移除AsyncPostBackTrigger，甚至删除整个ASP尝试：的UpdatePanel然后还要我FileUpload1.HasFile始终返回false

I have tried even by removing AsyncPostBackTrigger and even by removing Whole asp:updatePanel then also my FileUpload1.HasFile always returns false.

推荐答案

ASP.NET的AJAX的事不支持的UpdatePanel文件上传开箱。该触发器变成一个 PostBackTrigger （这会导致一个完整的页面加载），或者使用别的上传的文件。

ASP.NET's "AJAX" thing doesn't support file uploads in UpdatePanels out of the box. Change that trigger into a PostBackTrigger (which causes a full page load) or use something else to upload the file.

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