Asp.net自定義ajax文件上傳器

Question

我開發自定義文件上傳器。

<asp:FileUpload runat="server" ID="fuUpload" /> 

<asp:UpdatePanel runat="server" > 
    <ContentTemplate> 
    <asp:Button ID="btnUpload" runat="server" Text="Upload" CausesValidation="false" 
      OnClick="btnUpload_Click" /> 

     <div> 
     <asp:Label ID="lblError" runat="server" Visible="false" ForeColor="Red" /></div> 
     <asp:Repeater ID="rptAttachments" runat="server" OnItemCommand="Uploader_ItemCommand"> 
      <ItemTemplate> 
       <div> 
        <a href='<%#GetUrl(....) %>'><%#Eval("Filename") %></a> <b> 
        <asp:LinkButton ID="lnkDelete" runat="server" Text="Удалить" CommandName="DeleteAttachment" CommandArgument='<%#Eval("FileName") %>' /></b> 
       </div> 
      </ItemTemplate> 
     </asp:Repeater> 
    </ContentTemplate> 
    <Triggers> 
     <asp:AsyncPostBackTrigger ControlID="btnUpload" EventName="Click" /> 
     <asp:AsyncPostBackTrigger ControlID="rptAttachments" EventName="ItemCommand" /> 
    </Triggers> 
</asp:UpdatePanel> 




protected void btnUpload_Click(object sender, EventArgs e) 
    {   
    //fuUpload.HasFile == false 
    if (fuUpload.HasFile && fuUpload.PostedFile != null 
     && fuUpload.PostedFile.ContentLength > 0) 
    { 
    } 
    } 

我不知道爲什麼總是fuUpload.HasFile equls null。

Answer 1

試試這些東西。

1. 將<asp:FileUpload runat="server" ID="fuUpload" />內UpdatePanel
2. 集btnUpload觸發這個樣子。 <asp:PostBackTrigger ControlID="btnUpload" />