Question

我有一个表单，用户将他们的图片上传到注册表单..一切正常，直到我添加了一个更新面板和一个图像控件。

我放置了一个更新面板，在其中我放置了一个带有Fileupload控件和图像控件的表。单击按钮后，图像将上载到images文件夹，预览将显示在图像控件中。

在进行修改之前它工作得很好..但是现在我无法读取FileUpload1.Filename ..下面是代码

Reg.aspx

    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>

    <asp:UpdatePanel ID="UpdatePanel1" runat="server">
        <ContentTemplate>

    <table> <tr>
<td>
<asp:FileUpload ID="FileUpload1" runat="server" />
                            <asp:Button ID="btnUpload1" runat="server" onclick="btnUpload1_Click" 
                                Text="Upload"  />
    <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
</td>
</tr>
<tr>
<Td>
 <asp:Image ID="Image1" runat="server" Width="147px" /></td></tr>
</table>

Reg.aspx.cs

protected void btnUpload1_Click(object sender, EventArgs e)
{
    Label1.Text = FileUpload1.FileName;


    try
     {
         var folder = Server.MapPath("~/UploadImages/");



         if (!Directory.Exists(folder))
         {
             Directory.CreateDirectory(folder);
             Label1.Text = Label1.Text + " Directory  Created <br>";

         }
             var picUrl = Server.MapPath("~/UploadImages/"+   FileUpload1.FileName.ToString());
             if (CheckFileName(picUrl) == true)
             {
                 FileUpload1.SaveAs(picUrl);
                 Image1.ImageUrl = picUrl.ToString();
                 Label1.Text = Label1.Text + "Image Uploaded";
             }
             else
                 Label1.Text = Label1.Text +"File already exists";


    }
    catch (IOException ioex)
            {
            Console.WriteLine(ioex.Message);
            }


}

   private bool CheckFileName(string picUrl) {

    if (File.Exists(picUrl))
        return false;
    return (true);

}

现在我无法从fileupload1控件中读取文件名..

请帮忙

Answer 1

在更新面板中添加回发触发器。看看下面的代码示例

<强> ASPX：

<asp:UpdatePanel runat="server" ID="updatePanel1">
    <ContentTemplate>
        <asp:FileUpload runat="server" ID="fileUploader"/>
        <asp:Button runat="server" ID="buttonSubmit" OnClick="buttonSubmit_OnClick" Text="Submit"/>
    </ContentTemplate>
    <Triggers>
        <asp:PostBackTrigger ControlID="buttonSubmit"/>
    </Triggers>
</asp:UpdatePanel>

<强> ASPX.cs

protected void buttonSubmit_OnClick(object sender, EventArgs e)
{
    var fileName = this.fileUploader.FileName;
}

置于UpdatePanel中时无法读取fileupload1.filename

1 个答案: