Question

我正在尝试将该图像路径绑定到图像上传控件（页面刷新后），该控件已保存在会话中以及视图状态中，但缺少某些内容并且无法处理该内容...会话和视图状态正确路径存储但没有绑定。只有这件事需要解决...

获取Unable的异常，将'System.String'类型的对象强制转换为'System.Web.UI.WebControls.FileUpload'。

fuUploadLogo是我的图片上传控件，第二行不能将会话中的路径绑定到fileupload控件。

asp：FileUpload ID =“fuUploadLogo”runat =“server”

        if (Session["PicturePath1"] == null)
        {
            Session["PicturePath1"] = ViewState["PicturePath"].ToString();
        }
        else if (Session["PicturePath1"] != null)
        {
            fuUploadLogo = (FileUpload)Session["PicturePath1"];                
        }

Answer 1

我认为您应该添加图像控件来查看图片，例如：

在aspx中，添加

<VideoView
    android:id="@+id/videoView2"
    android:layout_width="250dp"
    android:layout_height="300dp"
 />

在aspx.cs中

 <asp:Image ID="Image1" runat="server" />

Answer 2

请尝试以下

<asp:FileUpload ID="fileupload1" runat="server"></asp:FileUpload>

         //If first time page is submitted and we have file in FileUpload control but not in session 
        // Store the values to SEssion Object 
        if (Session["PicturePath"] == null && FileUpload1.HasFile)  
        { 
            Session["PicturePath"] = FileUpload1.PostedFile.FileName; 
        } 
        // Next time submit and Session has values but FileUpload is Blank 
        // Return the values from session to FileUpload 
        else if (Session["PicturePath"] != null && (! FileUpload1.HasFile)) 
        { 
            FileUpload1 = (FileUpload) Session["PicturePath"]; 

        } 
        // Now there could be another sictution when Session has File but user want to change the file 
        // In this case we have to change the file in session object 
        else if (FileUpload1.HasFile) 
        { 
            Session["PicturePath"] = FileUpload1.PostedFile.FileName; 

        }

如何在c＃中回发后将图像路径绑定到图像上传控件

2 个答案: