如何从父页面访问用户控件的映像？

Question

我有一个用户控件，可以上传图像并向用户显示。在父页面上传图像后，我想将图像URL保存到数据库，但我不能。这是我使用的代码，但图像为空。

Image img = new Image();  
img = this.Uploade1.FindControl("Image1") as Image;

<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<contenttemplate>
            <table class="auto-style1">
                <tr>
                    <td class="auto-style2">
                        &nbsp;</td>
                    <td rowspan="3">
                        <asp:Image ID="Image1" runat="server" Height="100" ImageAlign="Middle" Width="100" />
                        <br />
                        <asp:Label ID="StatusLabel" runat="server" Font-Names="Tahoma" Font-Size="8pt" Visible="False"></asp:Label>
                    </td>
                </tr>
                <tr>
                    <td class="auto-style2">

                        <asp:FileUpload ID="FileUploadControl" runat="server" />
                    </td>
                </tr>
                <tr>
                    <td class="auto-style2">

                        <asp:Button ID="btnUpload" runat="server" OnClick="ButtonUpload_Click" Text="بارگذاری" />
                    </td>
                </tr>
            </table>
            <br />
        </contenttempl

protected void ButtonUpload_Click(object sender, EventArgs e)
    {
        //Path to store uploaded files on server - make sure your paths are unique
        string Id = Request.QueryString["id"];
        //string thumbPath = "../upFiles/_thumb_" + Guid.NewGuid().ToString() + ".jpg";
        //string filePath = thumbPath.Replace("_thumb_", "");
        string filePath = "../upFiles/" + Guid.NewGuid().ToString() + ".jpg";

        try
        {
            // Check that there is a file
            if (FileUploadControl.HasFile)
            {
                if (FileUploadControl.PostedFile.ContentType == "image/jpeg")
                {
                    if (FileUploadControl.PostedFile.ContentLength  0) && (System.IO.Path.GetExtension(myFile.FileName).ToLower() == ".jpg"))
                        {
                            // Read file into a data stream
                            byte[] myData = new Byte[nFileLen];
                            myFile.InputStream.Read(myData, 0, nFileLen);
                            myFile.InputStream.Dispose();

                            // Save the stream to disk as temporary file. 
                            // make sure the path is unique!
                            System.IO.FileStream newFile
                                    = new System.IO.FileStream(Server.MapPath(filePath.Remove(0,3)),
                                                    System.IO.FileMode.Create);
                            newFile.Write(myData, 0, myData.Length);


                            newFile.Close();


                            System.IO.File.Delete(Server.MapPath(filePath.Remove(0, 3) +"_temp.jpg"));

                            //. new cpode
                            Image1.ImageUrl = filePath.Remove(0, 3);
                        }
                    }

        }
        catch (Exception ex)
        {
            StatusLabel.ForeColor = System.Drawing.Color.Red;
            StatusLabel.Text =  ex.Message;
        }
    }

Answer 1

您可以使用会话保存图像url，然后在子页面中检索该url并保存到数据库。

第一页：

Session["url"] = imageUrl;

第二页：

string url = (string)Session["url"] ;
//save to database