Repeater动态添加行

<table class="table table-striped table-bordered table-hover">
            <asp:Repeater ID="rp_List" runat="server" onitemcommand="rp_List_ItemCommand">
                <HeaderTemplate>
                    <thead>
                        <tr>
                            <th>
                                ID
                            </th>
                            <th>
                                中文内容
                            </th>
                            <th>
                                英文内容
                            </th>
                            <th>
                                是否上传声音<%--（添加时<span class="text-danger">必填</span>）--%>
                            </th>
                            <th width="80px">
                                头像
                            </th>
                            <th width="80px">
                                对话排序
                            </th>
                            <th width="80px">
                                最大时间
                            </th>
                            <th width="80px">
                                声音时间
                            </th>
                            <th>
                                操作
                            </th>
                        </tr>
                    </thead>
                </HeaderTemplate>
                <ItemTemplate>
                    <tr>
                        <td>
                            <%# Container.ItemIndex+1 %>
                            <asp:HiddenField ID="hidid" runat="server" Value='<%#Eval("id") %>' />
                        </td>
                      
                        <td>
                            <asp:TextBox ID="txtCountentzh" runat="server" Text='<%#Eval("Contentzh") %>' class="form-control"></asp:TextBox>
                        </td>
                        <td>
                            <asp:TextBox ID="txtCountenten" runat="server" Text='<%#Eval("Contenten") %>' class="form-control"></asp:TextBox>
                        </td>
                        <td>
                            <%--<asp:FileUpload ID="FileUpload" runat="server" CssClass="form-control" />--%>
                            <asp:Label ID="lblsound" runat="server" Text='<%#Eval("IsHave") %>'></asp:Label>
                        </td>
                        <td>
                            <asp:TextBox ID="txtPhoto" runat="server" class="form-control" Text='<%#Eval("photo") %>'></asp:TextBox>
                        </td>
                        <td>
                            <asp:TextBox ID="txtOrder" runat="server" class="form-control" Text='<%#Eval("orderby") %>'></asp:TextBox>
                        </td>
                        <td>
                            <asp:TextBox ID="txtMaxsecond" runat="server" class="form-control" Text='<%#Eval("maxsecond") %>'></asp:TextBox>
                           
                        </td>
                        <td>
                            <asp:TextBox ID="txtSoundSize" runat="server" class="form-control" Text='<%#Eval("soundsize") %>'></asp:TextBox>
                        </td>
                        <td>
                            <%--<a href="DuihuaDelete.aspx?id=<%#Eval("id") %>&page=<%=CurrentPage %>&pianzhangid=<%=pzid %>" class="btn btn-danger" onclick="return confirm('是否删除该数据')">删除</a>--%>
                             <%--<a href="DuihuaEdit.aspx?id=<%#Eval("id") %>&pianzhangid=<%=pzid %>" class="btn btn-primary">编辑</a>
                            <a href="DuihuaiDetail.aspx?id=<%#Eval("id") %>" class="btn btn-default btn-primary" title="详情">详情</a>--%>
                            <asp:LinkButton ID="lbtnDelete" runat="server" CssClass="btn btn-danger" OnClientClick='return confirm("确定删除?")' CommandName="del" CommandArgument='<%#Eval("id") %>'>删除</asp:LinkButton>
                            <asp:LinkButton ID="lbtnEdit" runat="server" CssClass="btn btn-default" CommandName="edit" CommandArgument='<%#Eval("id") %>'>编辑</asp:LinkButton>
                        </td>
                </ItemTemplate>
                <FooterTemplate>
                    <tr id="Tr1" runat="server" visible="<%#rp_List.Items.Count==0 %>">
                        <td colspan="9" class="indent15">
                            未找到符合条件的信息
                        </td>
                    </tr>
                </FooterTemplate>
            </asp:Repeater>
        </table>

后台代码：

protected void btnAddNewRow_Click(object sender, EventArgs e)
{

 //首先，恢复数据源

DataTable dt = DefineDataTableSchema(hfRptColumns.Value);            

foreach (RepeaterItem item in rp_List.Items)           

  {                

DataRow newRow = dt.NewRow();               

newRow["id"] = ((HiddenField)item.FindControl("hidid")).Value;                 

newRow["Contentzh"] = ((TextBox)item.FindControl("txtCountentzh")).Text;                

newRow["Contenten"] = ((TextBox)item.FindControl("txtCountenten")).Text;                

newRow["photo"] = ((TextBox)item.FindControl("txtPhoto")).Text;                

newRow["orderby"] = ((TextBox)item.FindControl("txtOrder")).Text;                

newRow["maxsecond"] = ((TextBox)item.FindControl("txtMaxsecond")).Text;                

newRow["IsHave"] = ((Label)item.FindControl("lblsound")).Text;                

newRow["soundsize"] = ((TextBox)item.FindControl("txtSoundSize")).Text;

dt.Rows.Add(newRow);            

}

//添加一行            

DataRow row = dt.NewRow();

row["Contentzh"] = "";            

row["Contenten"] = "";            

row["photo"] = "";            

row["orderby"] = "0";            

row["maxsecond"] = "1";            

row["IsHave"] = "未上传";            

row["soundsize"] = "1";

dt.Rows.Add(row);                        

rp_List.DataSource = dt;            

rp_List.DataBind();

}

/// <summary>
        /// 根据repeater相对应的列名，定义数据源datatable的schema
        /// </summary>
        /// <param name="columns">列名</param>
        /// <returns></returns>
        public DataTable DefineDataTableSchema(string columns)
        {
            DataTable dt = new DataTable();
            string[] columnsAry = columns.Split(',');
            foreach (string str in columnsAry)
            {
                dt.Columns.Add(str);
            }
            return dt;
        }