文件上传和的UpdatePanel：ScriptManager.RegisterPostBackControl工作第二次 [英] FileUpload and UpdatePanel: ScriptManager.RegisterPostBackControl works the second time

问题描述

我正在开发用C＃和Visual Studio 2008 SP1的ASP.NET应用程序。我使用的WebForms。

I'm developing an ASP.NET application with C# and Visual Studio 2008 SP1. I'm using WebForms.

我有两个UpdatePanel的，一个是关于持有在哪里我动态加载用户控件权的TreeView和其他左侧有一个ASPX页面。

I have an ASPX page with two UpdatePanels, one on the left that holds a TreeView and other on the right where I load dynamically user controls.

一个用户控制，我右边的面板上使用，有一个FileUpload控件和一个按钮，以节省服务器的文件。该ASCX code，以节省控制：

One user control, that I used on right panel, has a FileUpload control and a button to save that file on server. The ascx code to save control is:

<asp:UpdatePanel ID="UpdatePanelBotons" runat="server" RenderMode="Inline" 
    UpdateMode="Conditional">
<ContentTemplate>
    <asp:Button ID="Save" runat="server" Text="Guardar" 
                onclick="Save_Click" CssClass="button" />
    </ContentTemplate>
    <Triggers>
        <asp:PostBackTrigger ControlID="Save" />
    </Triggers>
</asp:UpdatePanel>

我做一个完整的回发到上传文件到服务器上，并保存到数据库中。但是，我总是在FileUpload.HasFile越来越假。

I make a full postback to upload the file to the server and save it to database. But I always getting False on FileUpload.HasFile.

我的问题是正确的UpdatePanel。我需要它来动态加载用户控件。此面板有三个UpdatePanel的加载，我用三个用户控件。

I problem is the right UpdatePanel. I need it to load dynamically the user controls. This panel has three UpdatePanels to load the three user controls that I use.

也许我可以用一个异步文件上传或删除的权利更新面板，并做了充分的回传动态加载控件。

Maybe I can use an Async File Uploader or delete the right Update Panel and do a full postback to load controls dynamically.

有什么建议？

更新：

RegisterPostBackControl 工作 ...我第二次点击Save按钮。第一次FileUpload.HasFile为FALSE，且第二次是真。

RegisterPostBackControl works... the second time I click on save button. First time FileUpload.HasFile is FALSE, and second time is TRUE.

第二次修订

首先点击我还要检查ScriptManager.IsInAsyncPostBack是FALSE。我什么都不懂！

Second Update
On first click I also check ScriptManager.IsInAsyncPostBack and is FALSE. I don't understand ANYTHING!!

为什么？

在code加载用户控件第一次，在每次回发是：

The code to load user control first time, and on each postback is:

DynamicControls.CreateDestination ud =
            this.LoadControl(ucUrl) as DynamicControls.CreateDestination;
if (ud != null)
{
    Button save = ud.FindControl("Save") as Button;
    if (save != null) 
        ScriptManager1.RegisterPostBackControl(save);
    PanelDestination.Controls.Add(ud);
}

感谢您。

推荐答案

对于我这个解决方案工作：

For me this solution worked:

添加
Page.Form.Attributes.Add（ENCTYPE，多部分/表单数据）;

add Page.Form.Attributes.Add("enctype", "multipart/form-data");

该enctype属性上缺少第一回发。

The enctype attribute is missing on the first postback.

<一个href=\"http://adamnoffie.blogspot.com/2007/10/file-upload-not-working-on-first.html\">http://adamnoffie.blogspot.com/2007/10/file-upload-not-working-on-first.html

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