使用 AsyncFileUpload Control 上传文件并存储答案

【问题标题】：Upload a file using AsyncFileUpload Control and store it使用 AsyncFileUpload Control 上传文件并存储
【发布时间】：2011-07-26 08:32:03
【问题描述】：

我正在做一个项目：

Front end - Visual Studio 2010

Technology : C#

Back end - Sql Server 2005

我正在尝试使用 AsyncFileUpload Control 上传文件并将其存储到“~/Image/”文件夹。

脚本：

<asp:UpdatePanel ID="UpdatePanel1" runat="server">
    <ContentTemplate>
        <asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>
        <asp:AsyncFileUpload ID="AsyncFileUpload1" runat="server" 
            onuploadedcomplete="AsyncFileUpload1_UploadedComplete"/>
    </ContentTemplate>

后面的代码：

protected void AsyncFileUpload1_UploadedComplete(object sender, AjaxControlToolkit.AsyncFileUploadEventArgs e)
{
    if (AsyncFileUpload1.HasFile)
    {
        AsyncFileUpload1.SaveAs("~/Image/" + AsyncFileUpload1.FileName);
        Label2.Text = "Recieved " + AsyncFileUpload1.FileName + " Content Type" + AsyncFileUpload1.PostedFile.ContentType;
    }
}

但每次显示运行时错误时都会调用：

The SaveAs method is configured to require a rooted path, and the path '~\Image\Filename.jpg' is not rooted.

我可以知道错误及其解决方案吗？

提前致谢，

尼基尔

【问题讨论】：

这是exact duplicate

标签： c# visual-studio-2010 ajaxcontroltoolkit

【解决方案1】：

我想通了：

table width="100%" style="font: 8pt verdana">
                <tr width="100%">
                <td width="40%">
                    <asp:FileUpload ID="FileUpload1" runat="server" />
                    <asp:HiddenField ID="HiddenField1" runat="server" />
                </td>
                <td width="40%"><asp:Label ID="lblPicStatus" runat="server"></asp:Label></td>
                <td>
                <asp:Button ID="Button2" runat="server" Text="Upload" BackColor="White" 
                        BorderColor="#507CD1" BorderStyle="Solid" BorderWidth="1px" 
                        onclick="Button2_Click"/></td>
                </tr>
</table>

代码隐藏，

protected void Button2_Click(object sender, EventArgs e)
{

    try
    {
        con.Open();
        if (FileUpload1.HasFile)
        {
            String fileExt = Path.GetExtension(FileUpload1.FileName);
            if (fileExt == ".jpg" || fileExt == ".gif" || fileExt == ".bmp" || fileExt == ".jpeg" || fileExt == ".png")
            {
                String path = "~/Image/" + FileUpload1.FileName;
                cmd.CommandText = "update " + HttpContext.Current.User.Identity.Name + " set image = '" + path + "'";
                cmd.Connection = con;
                cmd.ExecuteNonQuery();
                FileUpload1.SaveAs(Server.MapPath("~/Image/") + FileUpload1.FileName);
                Response.Redirect(Request.RawUrl);
            }
            else
            {
                lblPicStatus.Text = "File to be uploaded is not an image";
            }
            con.Close();
        }
    }

    catch (Exception a)
    {
        Response.Write(a.Message);
    }
}

【讨论】：

【解决方案2】：

 String path = "~/Image/" + FileUpload1.FileName;

应该是这样的：

 String path = Server.MapPath("~/Image/") + FileUpload1.FileName;

【讨论】：