用于fileupload按钮的Hasfile返回false [英] The Hasfile for the fileupload button returns false

问题描述

我正在使用更新面板中的文件上传按钮.第一次运行正在运行的程序时，它返回false.之后，它可以正常工作.我在回发触发器中添加了按钮.有没有解决此问题的方法.这是代码:

Hi,

I am using the file upload button inside the update panel. While running the running the program first time it returns false. After that it works fine. I have added the button in post back trigger. Is there any solution for this issue. Here is the code:

Protected Sub Button1_Click1(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        Try

            If Not myFileUpload.HasFile Then
                lblmsg.Text = "Please select the Excel file to Import"
                myFileUpload.Focus()
                Exit Sub
            End If

结束sub

End sub

推荐答案

请参阅此论坛.
你会得到答案

http://forums.asp.net/t/1057993.aspx/1?FileUpload + HasFile + returns + false + everytime + [ ^ ]

see this forum.
u will get answer

http://forums.asp.net/t/1057993.aspx/1?FileUpload+HasFile+returns+false+everytime+[^]

我找到了这个问题的答案.请添加以下代码以解决该问题.

Hi,

I found the answer for this issue. Please add the below code to solve the problem.

Protected Sub Page_PreRender(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.PreRender
        Dim Form As HtmlForm = Page.Form
        If Form.Enctype.Length = 0 Then
            Form.Enctype = "multipart/form-data"
        End If
    End Sub

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