如何向按钮提供文件上传控件的功能？我尝试下面的代码，但点击按钮文件浏览器不显示。 [英] How do I can provide functionality of a file upload control to button? I tried below code but on click of button file browser not showing.

问题描述

protected void Button3_Click(object sender, EventArgs e)
{
    // Initializes a OpenFileDialog instance


    FileUpload fu = new FileUpload();
    string filename = Path.GetFileName(fu.FileName);
    fu.SaveAs(Server.MapPath("~/Excel/") + filename);
    MessageBox("Upload status: File uploaded!");

}

推荐答案

你可以像这样动态创建控件

You'd dynamically create the control like this

<asp:Panel ID="PanelContainer" runat="server">

</asp:Panel>

<asp:Button ID="ButtonUpload" runat="server" OnClick="ButtonUpload_Click" Text="Upload" />

<asp:Literal ID="LiteralMessage" runat="server" Visible="false" EnableViewState="false"><p>File uploaded</p></asp:Literal>

代码隐藏

code-behind

protected void Page_Load(object sender, EventArgs e)
{
    FileUpload fu = new FileUpload();
    fu.ID = "MyFileUpload";
    PanelContainer.Controls.Add(fu);
}        

protected void ButtonUpload_Click(object sender, EventArgs e)
{
    FileUpload fu = PanelContainer.FindControl("MyFileUpload") as FileUpload;

    if (fu != null && fu.HasFile)
    {
        fu.SaveAs(Server.MapPath(string.Concat("~/app_data/", fu.FileName)));

        LiteralMessage.Visible = true;
    }
}

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