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我正在开发一个使用中继器控件的项目，并且在其项目数据绑定事件中，我正在添加一些数据和两个按钮-编辑和删除。但是我的按钮的单击事件不起作用，当我单击这两个中的任何一个时按钮我的中继器数据消失了。

以下是我的代码

protected void fillrptmapping()
{
    ds = objcce1.selectSubject(schoolcode);
    rptmapping.DataSource = ds;
    rptmapping.DataBind();
}
protected void rep_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
    {
        Label lblsubcode = (Label)e.Item.FindControl("lblsubcode");
        Table tblmapping = (Table)e.Item.FindControl("tblmapping");
        int subcode =Convert.ToInt32(lblsubcode.Text.ToString());
        DataSet ds1 = new DataSet();
        ds1 = objcce1.selectSubjectskillmapping(schoolcode);
        DataSet ds2 = new DataSet();
        ds2 = objcce1.selectAssessfullmapping(schoolcode);
        DataRow[] dr1;
        DataRow[] dr2;

                TableRow tr = new TableRow();
                tr.Width = 300;
                TableCell tc = new TableCell();
                tr.Width = 300;
                tc.Height = 100;
                //selecting skillmappingcodes
                dr1 = ds1.Tables[0].Select("subjectgroupcode='" + subcode + "'");
                for (int j = 0; j < dr1.Length; j++)
                {
                    Label lblskill = new Label();
                    lblskill.CssClass = "lblskilltxt";
                    lblskill.Text = dr1[j]["skillname"].ToString() + "<br/>";
                    tc.Controls.Add(lblskill);
                    dr2 = ds2.Tables[0].Select("skillmappingcode='" + dr1[j]["skillmappingcode"] + "'");
                    for (int k = 0; k < dr2.Length; k++)
                    {
                        ImageButton imgedit = new ImageButton();
                        imgedit.ImageUrl = "../Images/edit.jpg";
                        imgedit.Width = 25;
                        imgedit.Height = 25;
                        imgedit.ID = dr2[k]["assessmentareamappingcode"].ToString();
                        imgedit.Click += new ImageClickEventHandler(imgeditassessmapping_OnClick);
                        //Button btnedit = new Button();
                        //btnedit.ID = dr2[k]["assessmentareamappingcode"].ToString();
                        //btnedit.Click += new System.EventHandler(this.imgeditassessmapping_OnClick);
                        ImageButton imgdelete = new ImageButton();
                        imgdelete.Width = 25;
                        imgdelete.Height = 25;
                        imgdelete.ImageUrl = "../Images/delete.jpg";
                        imgdelete.Click += new ImageClickEventHandler(this.imgdeleteassessmapping_OnClick);
                        Label lblarea = new Label();
                        lblarea.Text = dr2[k]["assessmentareaname"].ToString() + "<br/><br/>";
                        tc.Controls.Add(btnedit);
                        tc.Controls.Add(imgdelete);
                        tc.Controls.Add(lblarea);
                    }
                }
                //selecting subjectgroup in area table
                dr2 = ds2.Tables[0].Select("subgroupcode='" + subcode + "'");
                for (int l = 0; l < dr2.Length; l++)
                {
                    ImageButton imgedit = new ImageButton();
                    imgedit.Width = 25;
                    imgedit.Height = 25;
                    imgedit.ImageUrl = "../Images/edit.jpg";
                    imgedit.Click += new ImageClickEventHandler(this.imgeditassessmapping2_OnClick);
                    ImageButton imgdelete = new ImageButton();
                    imgdelete.Width = 25;
                    imgdelete.Height = 25;
                    imgdelete.ImageUrl = "../Images/delete.jpg";
                    imgdelete.Click += new ImageClickEventHandler(this.imgdeleteassessmapping2_OnClick);
                    Label lblarea = new Label();
                    lblarea.Text = dr2[l]["assessmentareaname"].ToString() + "<br/>";
                    tc.Controls.Add(imgedit);
                    tc.Controls.Add(imgdelete);
                    tc.Controls.Add(lblarea);
                }
                tr.Cells.Add(tc);
                tblmapping.Rows.Add(tr);            
    }
}
protected void imgeditassessmapping_OnClick(object sender,EventArgs e)
{
    Button img = sender as Button;
    string assessmappingcode = img.ID;
    ds =objcce1.selectAssessSkill(schoolcode, assessmappingcode);
    foreach (ListItem item in drpsubjectoption.Items)
    {
        if (item.Value == ds.Tables[0].Rows[0]["subjectgroupcode"].ToString())
        {
            item.Selected = true;
        }
    }
    rblmapping.SelectedIndex = 0;
    spanskill.Visible = true;
    drpmappingskill.Visible = true;
    foreach (ListItem item in drpmappingskill.Items)
    {
        if (item.Value == ds.Tables[0].Rows[0]["skillcode"].ToString())
        {
            item.Selected = true;
        }
    }
    pnlassessmapping.Visible = true;
    foreach (ListItem item in drpassessmapping.Items)
    {
        if (item.Value == ds.Tables[0].Rows[0]["assessmentareacode"].ToString())
        {
            item.Selected = true;
        }
    }
    foreach (ListItem item in drpmarkingtype.Items)
    {
        if (item.Text == ds.Tables[0].Rows[0]["type"].ToString())
        {
            item.Selected = true;
        }
    }
    foreach (ListItem item in rbldesc.Items)
    {
        if (item.Text == ds.Tables[0].Rows[0]["desindreq"].ToString())
        {
            item.Selected = true;
        }
    }
    btnsavemapping.Text = "Update";
}
protected void imgdeleteassessmapping_OnClick(object sender,ImageClickEventArgs e)
{
}

ASPX 页面代码

<asp:Repeater ID="rptmapping" runat="server" OnItemDataBound="rep_ItemDataBound" >
                    <HeaderTemplate></HeaderTemplate>
                    <ItemTemplate>
                        <table>
                            <tr>
                                <td>
                                    <asp:Label ID="lblsubcode" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "subgroupcode")%>'></asp:Label>
                                    <asp:Label ID="lblsubject" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "subname")%>'></asp:Label>
                                    <asp:Button ID="Button1" runat="server" Text="Button" OnClick="imgeditassessmapping_OnClick"/>
                                </td>
                            </tr>   
                            <tr>
                                <td>
                                    <asp:Table ID="tblmapping" runat="server" Width="300" BorderColor="Black" GridLines="both"></asp:Table>
                                </td>
                            </tr>                         
                         </table>
                    </ItemTemplate>
                </asp:Repeater>

单击按钮前的屏幕截图

在此处输入图像描述

单击按钮后的屏幕截图 在此处输入图像描述

4

1 回答 1

1

You need to understand how your dynamic controls are being generated. They will need to be generated with the same IDs each time your page loads (i.e. on first load and on subsequent loads/post backs).

If the button doesn't exist (hasn't been generated) at the stage of the page lifecycle where it fires event handlers (e.g. button click events) then the event handler won't fire.

In general, the symptoms suggest that your ItemDataBound event handler isn't firing on postback; you may only be data binding if the request is not a postback. Getting the event to fire on each page request will help, but overall it would be better if you could have those buttons on the page all of the time, rather than dynamically generate them. That would give you a more reliable event handler.

于 2014-08-06T12:32:48.130 回答