自定义GridView控件中的TemplateControl复选框事件

时间:2012-07-05 10:07:47

标签: c# asp.net events gridview custom-controls

我有一个自定义GridView控件,我从数据库中获取数据以填充控件。在页面上,我还创建了一个HeaderTemplate复选框控件和一个ItemTemplate复选框控件:

<nm:ContactGridViewControl runat="server" ID="grdContacts">
        <Columns>
            <asp:TemplateField>
                <HeaderTemplate>
                    <asp:CheckBox runat="server" AutoPostBack="true" />
                </HeaderTemplate>
                <ItemTemplate>
                    <asp:CheckBox runat="server" />
                </ItemTemplate>
            </asp:TemplateField>
        </Columns>
    </nm:ContactGridViewControl>

我在OnInit事件中按如下方式填充GridView。我选择不重新填充每一个回发,因为它减慢了应用程序。

protected override void OnInit(EventArgs e)
    {
        this.RowDataBound += new GridViewRowEventHandler(ContactGridViewControl_RowDataBound);
        this.RowCreated += new GridViewRowEventHandler(ContactGridViewControl_RowCreated);

        if (!Page.IsPostBack)
        {
            List<EnquiryItem> contactList = new List<EnquiryItem>();
            DataTable list = new DataTable();

            if (SessionManager.LoginState != null)
            {
                contactList = SiteDataLayerHandler.GetContactList(SessionManager.LoginState.UserID);
            }

            if (contactList != null)
            {
                list.Columns.Add("LeadID");
                list.Columns.Add("Name");
                list.Columns.Add("Email Address");

                foreach (EnquiryItem item in contactList)
                {
                    DataRow row = list.NewRow();

                    row["LeadID"] = item.LeadID;
                    row["Name"] = string.Format("{0} {1}", item.FirstName.ToCapitalize(), item.LastName.ToCapitalize());
                    row["Email Address"] = item.EmailAddress;

                    list.Rows.Add(row);

                }

                this.DataSource = list;
                this.DataBind();
            }
        }

        base.OnInit(e);
    }

为了将所有与控件关联的代码保存在一个地方,我在'OnRowDataBound'上动态添加了'CheckedChanged'事件。这仅适用于HeaderTemplate中的Checkbox。原因是我可以将此复选框用作“选择/取消选择所有行”:

protected void ContactGridViewControl_RowDataBound(object sender, GridViewRowEventArgs e)
    {
        if (e.Row.RowIndex == -1) // Check if row is Header row
        {
            CheckBox chk = e.Row.GetAllControls().OfType<CheckBox>().FirstOrDefault();

            if (chk != null)
            {
                chk.CheckedChanged += new EventHandler(chk_CheckedChanged);
            }
        }
    }
然后我将事件代码放在同一页面上,如下所示:

protected void chk_CheckedChanged(object sender, EventArgs e)
    {
        bool isChecked = ((CheckBox)sender).Checked;

        foreach (GridViewRow row in this.Rows)
        {
            CheckBox chkBox = row.Cells[0].Controls[0] as CheckBox;

            if (chkBox != null)
            {
                chkBox.Checked = isChecked;
            }
        }
    }

这就是问题的起点。我的活动永远不会被击中!但是,复选框会回发。

1 个答案:

答案 0 :(得分:0)

好的答案是这样的。我需要在'OnRowCreated'事件而不是'OnRowDataBound'上分配CheckedChanged事件

protected override void OnRowCreated(GridViewRowEventArgs e)
    {
        if (e.Row.RowIndex == -1)
        {
            CheckBox chk = e.Row.GetAllControls().OfType<CheckBox>().FirstOrDefault();

            if (chk != null)
            {
                chk.CheckedChanged += new EventHandler(chk_CheckedChanged);
            }
        }
        base.OnRowCreated(e);
    }

这样事件每次都会触及方法