FormView + FileUpload-我可以基于fileupload更改绑定字段吗? [英] FormView + FileUpload - can I change a bound field based on the fileupload?

问题描述

我在ASP.NET 2.0应用程序中有一个FormView控件.我已经在数据库中将文件名(一个人的照片)存储在一列中.我无法将列的值绑定到fileupload控件-因此，我尝试使用隐藏的表单字段.这就是我所拥有的:

I have a FormView control in an ASP.NET 2.0 app. I've got the database storing a filename (a person's picture) in a column. I can't bind the value of the column to a fileupload control - so I'm trying to use a hidden form field. Here's what I have:

<asp:HiddenField ID="pictureLink" runat="server" Value='<%# Bind("pictureLink") %>' />
<asp:FileUpload ID="pic" runat="server" />

后面的代码:

//ItemUpdating event handler
void do_update(object sender, FormViewUpdateEventArgs e)
{
    FileUpload newpic = (FileUpload)profile_edit.FindControl("pic");
    if (newpic.HasFile)
    {
      //do a bunch of file uploading "stuff" which makes a new file name
      e.Keys["pictureLink"] = new_filename;
    }
}

我的目标是将隐藏表单字段的值更新为新更新的文件名，以便正确地更新数据库.

My goal is to update the hidden form field's value to the newly updated file name so the database is properly updated.

我认为我已经接近了-但是看来我不能在事后以编程方式更改任何绑定的数据字段.

I think I'm close - but it seems like I can't programmatically alter any of the bound data fields after-the-fact.

我尝试使用javascript更改控件-但新文件名实际上与他们上传的文件名不同；哪种javascript不一定能预测"并可靠地将正确的文件名放入隐藏的表单字段中

I've tried using javascript to change the control - but the new file name will actually be different than what they upload; which javascript can't necessarily "predict" and reliably put the correct file name into the hidden form field

有什么建议吗?

谢谢

推荐答案

好-我在发布问题后不久就找到了答案.如果有人有更好(更优雅)的解决方案，我将其保持打开状态.基本上，我更改了do_update事件处理程序以拦截文件上传.如果有文件，则我编辑NewValues集合，以便数据库接收新文件名，而不是旧文件名.

OK - I found the answer not too long after I posted the question. I'll leave it open in case someone has a better (more elegant) solution. Basically, I change the do_update event handler to intercept the file upload. If there's a file, then I edit the NewValues collection so that the database receives the new file name instead of the old one.

//ItemUpdating event handler
void do_update(object sender, FormViewUpdateEventArgs e)
{
    FileUpload newpic = (FileUpload)profile_edit.FindControl("pic");
    if (newpic.HasFile)
    {
      //do a bunch of file uploading "stuff" which makes a new file name
      //HERE IS THE CHANGE - update the newvalues object to the new file name
      e.NewValues[1] = new_filename;
    }
}

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