C＃.net中的动态中继器

时间：2009-04-04 18:10:09

标签： c# .net asp.net

我正在尝试使用ITemplate动态创建嵌套转发器。这个转发器就像我正在通过List<Control>并生成转发器。问题是当我数据库外转发器。仅显示最后一个嵌套转发器。以下是截屏。 screen shot

加价 

    <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="Restricted_Default" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <table style="border:solid 1px black;">
        <tr>
            <td>
                <asp:PlaceHolder ID="phControls" runat="server" />
            </td>
        </tr>
    </table>
    </div>
    </form>
</body>
</html>

代码背后 


using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;

public partial class Restricted_Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        CreateNestedRepeater();
    }

    private void CreateNestedRepeater()
    {
        Repeater childRpt = new Repeater();
        List repeatingRuleControls = new List();
        repeatingRuleControls.Add(new TextBox());
        repeatingRuleControls.Add(new TextBox());
        repeatingRuleControls.Add(new TextBox());
        RepeatingRuleTemplate repeatingRuleTemplate = new RepeatingRuleTemplate(ListItemType.Item, repeatingRuleControls);
        childRpt.HeaderTemplate = new RepeatingRuleTemplate(ListItemType.Header, repeatingRuleControls);
        childRpt.ItemTemplate = repeatingRuleTemplate;
        childRpt.FooterTemplate = new RepeatingRuleTemplate(ListItemType.Footer, null);
        childRpt.DataSource = new DataRow[4];

        Repeater parentRpt = new Repeater();
        repeatingRuleControls = new List();
        repeatingRuleControls.Add(new TextBox());
        repeatingRuleControls.Add(new TextBox());
        repeatingRuleControls.Add(new TextBox());
        repeatingRuleControls.Add(childRpt);
        RepeatingRuleTemplate parentrepeatingRuleTemplate = new RepeatingRuleTemplate(ListItemType.Item, repeatingRuleControls);
        parentRpt.HeaderTemplate = new RepeatingRuleTemplate(ListItemType.Header, repeatingRuleControls);
        parentRpt.ItemTemplate = parentrepeatingRuleTemplate;
        parentRpt.FooterTemplate = new RepeatingRuleTemplate(ListItemType.Footer, null);
        parentRpt.DataSource = new DataRow[4];
        parentRpt.DataBind();
        phControls.Controls.Add(parentRpt);
    }

    public class RepeatingRuleTemplate : ITemplate
    {
        ListItemType templateType;
        List innerControls;

        public RepeatingRuleTemplate(ListItemType type, List controls)
        {
            templateType = type;
            innerControls = controls;
        }



        public void InstantiateIn(Control container)
        {
            PlaceHolder ph = new PlaceHolder();

            switch (templateType)
            {
                case ListItemType.Header:
                    ph.Controls.Add(new LiteralControl(""));
                    ph.Controls.Add(new LiteralControl(""));
                    foreach (Control control in innerControls)
                    {
                        Label label = new Label();
                        label.Text = control.ID;
                        ph.Controls.Add(new LiteralControl(""));
                        ph.Controls.Add(label);
                        ph.Controls.Add(new LiteralControl(""));
                    }
                    ph.Controls.Add(new LiteralControl(""));
                    break;
                case ListItemType.Item:
                    ph.Controls.Add(new LiteralControl(""));

                    foreach (Control control in innerControls)
                    {
                        if (control.GetType() != typeof(Repeater))
                        {
                            ph.Controls.Add(new LiteralControl(""));
                            TextBox textBox = new TextBox();
                            textBox.ID = control.ID;
                            ph.Controls.Add(textBox);
                            ph.Controls.Add(new LiteralControl(""));
                        }
                        else
                        {
                            ph.Controls.Add(new LiteralControl(""));
                            ph.Controls.Add(control as Repeater);
                            //(control as Repeater).DataSource = new DataRow[4];
                            //   (control as Repeater).DataBind();
                            ph.Controls.Add(new LiteralControl(""));
                        }
                    }
                    ph.Controls.Add(new LiteralControl(""));
                    //ph.DataBinding += new EventHandler(Item_DataBinding);
                    break;
                case ListItemType.Footer:
                    ph.Controls.Add(new LiteralControl(""));
                    break;
            }
            container.Controls.Add(ph);
        }



        public List Controls
        {
            get
            {
                return innerControls;
            }
        }

    }
}

3 个答案:

答案 0 :(得分：0)

您需要为parentRpt.ItemDataBound事件编写处理程序并设置childRpt的DataSource属性，然后从那里调用child.Rpt.DataBind（）。

答案 1 :(得分：0)

为什么不只是制作自定义控件并用代码填充它？

override CreateChildControls(){  

    foreach(var r in rows)
    {
    ...
    }
}

模板，代理等等只是为了让设计更好，在您手动构建所有内容的情况下，我无法看到为什么与所有占位符，模板等过度复杂的原因......

只需构建CompositeControl并用您的代码填充它。您将减少两次代码，并且您将拥有可读代码的最佳代码。 Witout令人讨厌的事件，以连接子代理DataSource属性。

抱歉硬顶...

答案 2 :(得分：0)

好的家伙我想通了......感谢所有人。我犯了一个错误。模板类错了。我修复了它，现在它像Charm一样工作 Follwoing是班级


public class RepeatingRuleTemplate : ITemplate
    {
        ListItemType templateType;
        List innerControls;


    public RepeatingRuleTemplate(ListItemType type, List<Control> controls)
    {
        templateType = type;
        innerControls = controls;
    }



    public void InstantiateIn(Control container)
    {
        PlaceHolder ph = new PlaceHolder();

        switch (templateType)
        {
            case ListItemType.Header:
                ph.Controls.Add(new LiteralControl("<table border=\"0\">"));
                ph.Controls.Add(new LiteralControl("<tr>"));
                foreach (Control control in innerControls)
                {
                    Label label = new Label();
                    label.Text = control.ID;
                    ph.Controls.Add(new LiteralControl("<td>"));
                    ph.Controls.Add(label);
                    ph.Controls.Add(new LiteralControl("</td>"));
                }
                ph.Controls.Add(new LiteralControl("</tr>"));
                break;
            case ListItemType.Item:
                ph.Controls.Add(new LiteralControl("<tr>"));

                foreach (Control control in innerControls)
                {
                        //ph.Controls.Add(new LiteralControl("<td>"));
                        //ph.Controls.Add(control as TextBox);
                        //ph.Controls.Add(new LiteralControl("</td>"));
                    if (control.GetType() != typeof(Repeater))
                    {
                        ph.Controls.Add(new LiteralControl("<td>"));
                        TextBox textBox = new TextBox();
                        textBox.ID = control.ID;
                        ph.Controls.Add(textBox);
                        ph.Controls.Add(new LiteralControl("</td>"));
                    }
                    else
                    {
                        ph.Controls.Add(new LiteralControl("<td>"));
                        Repeater rpt = new Repeater();
                        rpt.DataSource = (control as Repeater).DataSource;
                        rpt.ItemTemplate = (control as Repeater).ItemTemplate;
                        rpt.HeaderTemplate = (control as Repeater).HeaderTemplate;
                        rpt.FooterTemplate = (control as Repeater).FooterTemplate;
                        rpt.DataBind();
                        ph.Controls.Add(rpt);
                        //(control as Repeater).DataSource = new DataRow[4];
                        //   (control as Repeater).DataBind();
                        ph.Controls.Add(new LiteralControl("</td>"));
                    }
                }
                ph.Controls.Add(new LiteralControl("</tr>"));
                //ph.DataBinding += new EventHandler(Item_DataBinding);
                break;
            case ListItemType.Footer:
                ph.Controls.Add(new LiteralControl("</table>"));
                break;
        }
        container.Controls.Add(ph);
    }



    public List<Control> Controls
    {
        get
        {
            return innerControls;
        }
    }

}
public RepeatingRuleTemplate(ListItemType type, List<Control> controls) { templateType = type; innerControls = controls; } public void InstantiateIn(Control container) { PlaceHolder ph = new PlaceHolder(); switch (templateType) { case ListItemType.Header: ph.Controls.Add(new LiteralControl("<table border=\"0\">")); ph.Controls.Add(new LiteralControl("<tr>")); foreach (Control control in innerControls) { Label label = new Label(); label.Text = control.ID; ph.Controls.Add(new LiteralControl("<td>")); ph.Controls.Add(label); ph.Controls.Add(new LiteralControl("</td>")); } ph.Controls.Add(new LiteralControl("</tr>")); break; case ListItemType.Item: ph.Controls.Add(new LiteralControl("<tr>")); foreach (Control control in innerControls) { //ph.Controls.Add(new LiteralControl("<td>")); //ph.Controls.Add(control as TextBox); //ph.Controls.Add(new LiteralControl("</td>")); if (control.GetType() != typeof(Repeater)) { ph.Controls.Add(new LiteralControl("<td>")); TextBox textBox = new TextBox(); textBox.ID = control.ID; ph.Controls.Add(textBox); ph.Controls.Add(new LiteralControl("</td>")); } else { ph.Controls.Add(new LiteralControl("<td>")); Repeater rpt = new Repeater(); rpt.DataSource = (control as Repeater).DataSource; rpt.ItemTemplate = (control as Repeater).ItemTemplate; rpt.HeaderTemplate = (control as Repeater).HeaderTemplate; rpt.FooterTemplate = (control as Repeater).FooterTemplate; rpt.DataBind(); ph.Controls.Add(rpt); //(control as Repeater).DataSource = new DataRow[4]; // (control as Repeater).DataBind(); ph.Controls.Add(new LiteralControl("</td>")); } } ph.Controls.Add(new LiteralControl("</tr>")); //ph.DataBinding += new EventHandler(Item_DataBinding); break; case ListItemType.Footer: ph.Controls.Add(new LiteralControl("</table>")); break; } container.Controls.Add(ph); } public List<Control> Controls { get { return innerControls; } } }

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