Yami寫筆記

aspx  一個TextBox  一個FileUpload 一個 Button

     <dx:ASPxTextBox ID="TextBox" runat="server" Enabled="False"  Visible="False" Width="300px" Height="19px">
      </dx:ASPxTextBox>
       <asp:FileUpload ID="FileUpload" runat="server" Width="300px"  BorderColor="#999999" BorderStyle="Solid" BorderWidth="1px"/>
       <dx:ASPxButton ID="Button" runat="server" Text="重新選擇檔案" Visible = "false"
       onclick="xbtnFilebghd_Click">
           <ClientSideEvents Click="function(s, e) {
           LoadingPanel.Show();
           }" />
        </dx:ASPxButton>

aspx.cs----------------------------------------------------------------------------------------------------------------------------------

string m_st = "";
               
                if (ViewState["file"] != null)
                {
                    if (ViewState["file"].ToString() != "")
                        m_st= ViewState["file"].ToString();
                }
                //上傳檔案
                if (m_st == "")  //m_st有值,表示此檔案不用重存
                {
                    if (this.FileUpload.HasFile)//判斷檔案是否存在
                    {
                       
                        if (CheckFiles("FileUpload"))  //檢查檔案類型
                        {   
                            m_st = FileUpload.PostedFile.FileName;
                            //記錄檔案名稱
                            TextBox.Text = m_st;
                            TextBox.Visible = true;

                           if (!CommLib.CheckFolder(strPath, true))
                            {
                                showPanelMsg("檔案上傳失敗!!");
                                return m_return = "";

                            }
                            FileInfo m_fileInfo = new FileInfo(m_st);

                            m_st = Guid.NewGuid().ToString()+ m_fileInfo.Extension;
                            while (true)
                            {
                                if (!File.Exists(m_inside_path + m_fileInfo.Extension + m_st)) break;

                                m_st = Guid.NewGuid().ToString()+ m_fileInfo.Extension;
                            }
                            strSaved_Path = Path.Combine(strPath, m_st);
                            FileUpload.SaveAs(strSaved_Path);
                         }
                        else
                        {
                            showPanelMsg(String.Format("{0}非gif,png,jpeg,jpg副檔名!!", FileUpload.PostedFile.FileName));

                            return m_return = "";
                        }
                    }
                }

 if (m_st != "")
                {                   
                  ViewState["file"] = m_st;
                    FileUpload.Visible = false;
                    Button.Visible = true;
                }

 

重新選擇按鈕

 protected void Button_Click(object sender, EventArgs e)
    {
        string m_msg = "";

        try
        {
            FileUpload.Visible = true;
            Button.Visible = false;

            ViewState["file"] = "";
            TextBox.Text = "";
            TextBox.Visible = false;

        }
        catch (Exception ex)
        {
            m_msg = ex.Message.ToString();
        }
        finally
        {
            if (m_msg == "")
                ScriptManager.RegisterStartupScript(Page, typeof(Page), "Update script", "LoadingPanel.Hide();", true);
            else
                ScriptManager.RegisterStartupScript(Page, typeof(Page), "Update script", "alert('" + m_msg + "');LoadingPanel.Hide();", true);
        }
    }