WebForm中动态批量文件上传

在WebForm中动态添加FileUpload控件和实现批量文件上传。

Web.config配置：

<appSettings>
    <add key="FileUpLoadPath" value="~/Content/Upload/"/>
    <add key="FileTypeLimit" value=".jpg,.gif"/>
    <add key="FileSizeLimit" value="1024000"/>
  </appSettings>

前台代码：

<table class="gbtext" id="tb_UploadedFiles" style="BORDER-COLLAPSE: collapse" borderColor="#93bee2"
                cellSpacing="0" cellPadding="0" width="100%" align="center" border="1" runat="server">
                <tr>
                    <td style="WIDTH: 94px"><font face="宋体">上传数量：</font></td>
                    <td>
                        <asp:DropDownList ID="ddl_USL" runat="server" AutoPostBack="True" 
                            onselectedindexchanged="ddl_USL_SelectIndex">
                             <asp:ListItem Value="0"  Text="请选择"></asp:ListItem>
                             <asp:ListItem Value="1" Text="1个"></asp:ListItem>
                             <asp:ListItem Value="2" Text="2个"></asp:ListItem>
                             <asp:ListItem Value="3" Text="3个"></asp:ListItem>
                             <asp:ListItem Value="4" Text="4个"></asp:ListItem>
                             <asp:ListItem Value="5" Text="5个"></asp:ListItem>
                             <asp:ListItem Value="6" Text="6个"></asp:ListItem>
                             <asp:ListItem Value="7" Text="7个"></asp:ListItem>
                             <asp:ListItem Value="8" Text="8个"></asp:ListItem>
                             <asp:ListItem Value="9" Text="9个"></asp:ListItem>
                             <asp:ListItem Value="10" Text="10个"></asp:ListItem>
                        </asp:DropDownList>
                    </td>
                    
                </tr>
                <tr>
                    <td style="WIDTH: 94px"><font face="宋体"></font></td>
                    <td>
                        <asp:Panel ID="pl_UF" runat="server">
                            
                        </asp:Panel>
                    </td>
                </tr>
                <tr>
                    <td style="WIDTH: 94px"><font face="宋体"></font></td>
                    <td><font face="宋体">
                        <input type="submit" value="上传" class="ButtonCss" />
                        </font></td>
                </tr>
            </table>

后台代码：

protected void Page_Load(object sender, EventArgs e)
        {
            if (Page.IsPostBack)
            {
                if (Request.Files.AllKeys.Any())
                {
                    var apath= ConfigurationManager.AppSettings["FileUpLoadPath"];
                    var fileSize = Convert.ToInt32(ConfigurationManager.AppSettings["FileSizeLimit"]);
                    string path=Server.MapPath(apath);
                    try
                    {
                        if (!Directory.Exists(path))
                            Directory.CreateDirectory(path);
                        foreach (string f in Request.Files.AllKeys)
                        {
                            if (Request.Files[f].ContentLength == 0) continue;
                            if (Request.Files[f].ContentLength > fileSize) continue;//图片大于配置文件大小不上传

                            string filename = Path.GetFileName(Request.Files[f].FileName);
                            Request.Files[f].SaveAs(Path.Combine(path, filename));
                            pl_UF.Controls.Add(new Label { Text = filename + "上传成功！" });
                            pl_UF.Controls.Add(new Literal { Text = "<br />" });
                        }
                    }
                    catch (Exception ex)
                    {
                        Response.Redirect("~/Error?error=" + ex.Message);
                    }
                }
            }
        }

        protected void ddl_USL_SelectIndex(object sender, EventArgs e)
        {
            int sl = Convert.ToInt32(ddl_USL.Items[ddl_USL.SelectedIndex].Value);
            if (sl != 0)
            {
                for (int x = 0; x < sl; x++)
                {
                    pl_UF.Controls.Add(new FileUpload { ID = "FU"+x.ToString() });
                    pl_UF.Controls.Add(new Literal { Text = "<br />" });
                }
            }
        }

实现效果：