动态生成的repeater中的按钮无法注册ItemCommand事件

aykkk 2019-08-27 05:23:58

想用repeater生成无限分类,参考网上资料后决定这样做:最顶级分类使用固定的repeater控件,下属的分类都用动态生成的repeater控件,生成的分类放在一个table中,一个类别一行,带一个按钮,按钮执行删除动作.写好之后发现,分类层次可以实现无限分类要求,但是只有最顶级分类,也就是那个固定repeater控件里的按钮可以执行动作,动态生成的repeater中绑定的按钮无法执行删除动作,而且一点击,除了最顶级分类外,其他各级分类都消失了.如何处理,请大佬帮忙?

代码如下:

前台html代码:



<asp:Repeater ID="Repeater1" runat="server" OnItemDataBound="Repeater1_ItemDataBound" OnItemCommand="Repeater1_ItemCommand">

     <HeaderTemplate>

 <table class="tablelist">

    	<thead>

    	<tr>

       

        <th width="10%">编号</th>

        <th width="10%">分类树</th>

        <th width="40%">栏目名称</th>

        <th width="10%">排序值</th>

        <th width="10%">栏目类型</th>

        <th width="15%">操作</th>

        </tr>

        </thead>

        <tbody>

 </HeaderTemplate>

<ItemTemplate>          

<tr>

        <td><%# Eval("classid") %></td>

        <td><img src="images/dirfirst.gif" width="15" height="13"></td>

        <td><%# Eval("classname") %></td>

        <td><%# Eval("px") %></td>

        <td><%# getlmlx(Eval("lmlx").ToString()) %></td>

        <td>

            <asp:Button ID="btndel" runat="server" Text="删除"  CommandArgument='<%# Eval("classid") %>' CommandName="del" /></td>

        </tr>

 </ItemTemplate>   

  <FooterTemplate>

      </tbody>

    </table>

  </FooterTemplate>    

   </asp:Repeater>

后台cs代码:



 protected void Page_Load(object sender, EventArgs e)

    {

        if (!IsPostBack)

        {

            DbUtility du = new DbUtility(cnstr, DbProviderType.OleDb);

            string str = "Select classid,classname,px,lmlx From [Class] where fatherid='0' order by px desc, classid";

            DataTable dt = du.ExecuteDataTable(str, null);

            Repeater1.DataSource = dt;

            Repeater1.DataBind();

        }

    }



    protected void Repeater1_ItemCommand(object source, RepeaterCommandEventArgs e)

    {

        string id = e.CommandArgument.ToString();

        switch (e.CommandName)

        {

            case "del":

                Response.Write("<script>alert('OK1!删除成功" + id + ".');</script>");

                break;

        }

    }



    protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)

    {

        if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)

        {

            DataRowView drv = (DataRowView)e.Item.DataItem;

            ListInnerCategory(e.Item, drv["classid"].ToString());

        }

    }



    private int currentLevel = 0;

    private void ListInnerCategory(RepeaterItem item, string ID)

    {

        string str = "Select count(*) From [Class] where fatherid=@cid ";

        DbUtility du = new DbUtility(cnstr, DbProviderType.OleDb);

        DbParameter[] pars = new DbParameter[]{

             du.CreateDbParameter("@cid",ID)

        };

        int hasc =Convert.ToInt32(du.ExecuteScalar(str, pars));

        if (hasc>0)

        {

            currentLevel++;

            string str2 = "Select classid,classname,px,lmlx From [Class] where fatherid=@cid order by px desc, classid";

            DbParameter[] pars2 = new DbParameter[]{

                du.CreateDbParameter("@cid",ID)

             };

            DataTable dt = du.ExecuteDataTable(str2, pars2);

            

            Repeater rep = new Repeater();

            CategoryTemplate template = new CategoryTemplate(currentLevel);



            rep.ItemTemplate = template;

            rep.ItemDataBound += new RepeaterItemEventHandler(rep_ItemDataBound);

            rep.ItemCommand += new RepeaterCommandEventHandler(rep_ItemCommand);

            rep.DataSource = dt;

            rep.DataBind();

            item.Controls.Add(rep);

            currentLevel--;



        }

    }



    protected void rep_ItemDataBound(object sender, RepeaterItemEventArgs e)

    {

        if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)

        {

            DataRowView drv = (DataRowView)e.Item.DataItem;

            TableRow tr = (TableRow)e.Item.FindControl("tr2");



            if (tr != null)

            {

                TableCell td1 = (TableCell)e.Item.FindControl("cid");

                td1.Text = drv["classid"].ToString();

                TableCell td2 = (TableCell)e.Item.FindControl("cpic");

                td2.Text = @"<img src='images/dirsecond.gif' width='20' height='20'>";

                TableCell td3 = (TableCell)e.Item.FindControl("cmc");

                td3.Text = drv["classname"].ToString();

                TableCell td4 = (TableCell)e.Item.FindControl("cpx");

                td4.Text = drv["px"].ToString();

                TableCell td5 = (TableCell)e.Item.FindControl("clx");

                td5.Text = getlmlx(drv["lmlx"].ToString());

                TableCell td6 = (TableCell)e.Item.FindControl("cop");

                if (td6 != null)

                {

                    Button btndel = (Button)e.Item.FindControl("btndel2");

                    btndel.CommandArgument = drv["classid"].ToString();

                    

                }

                ListInnerCategory(e.Item, drv["classid"].ToString());

            }

        }

    }



    protected void rep_ItemCommand(object source, RepeaterCommandEventArgs e)

    {

        string id = e.CommandArgument.ToString();

        switch (e.CommandName)

        {

            case "del2":

                Response.Write("<script>alert('OK2!删除成功"+ id +".');</script>");

                break;

        }

    }

repeater模板代码:



private int currentLevel;



    public CategoryTemplate(int level)

    {

        currentLevel = level;

    }



    public void InstantiateIn(Control container)

    {

        TableRow tr = new TableRow();

        tr.ID = "tr2";

        TableCell td1 = new TableCell();

        td1.ID = "cid";

        tr.Controls.Add(td1);

        

        TableCell td2 = new TableCell();

        td2.ID = "cpic";

        tr.Controls.Add(td2);

        

        TableCell td3 = new TableCell();

        td3.ID = "cmc";

        td3.Attributes.Add("style", "text-indent:" + (currentLevel * 20) + "px;");

        tr.Controls.Add(td3);

        

        TableCell td4 = new TableCell();

        td4.ID = "cpx";

        tr.Controls.Add(td4);

        

        TableCell td5 = new TableCell();

        td5.ID = "clx";

        tr.Controls.Add(td5);

        

        TableCell td6 = new TableCell();

        td6.ID = "cop";

        

        Button btndel = new Button();

        btndel.ID = "btndel2";

        btndel.Text = "删除";

        btndel.CommandName = "del2";



        td6.Controls.Add(btndel);

        tr.Controls.Add(td6);

        container.Controls.Add(tr);

    }