Question

我有一组生成的自定义控件，扩展为CompositeControl，定义为：

[PersistChildren(true)]
[ToolboxData("<{0}:ContractControl runat=server></{0}:ContractControl>")]
public class ContractControl : CompositeControl
{
    private int contractID = 0;
    private ContractTileControl tileControl = null;
    private ContractDetailControl detailControl = null;

    private HtmlGenericControl contractMainDiv = null;

    public int ContractID
    {
        get { return this.contractID; }
        set { this.contractID = value; }
    }

    public ContractTileControl TileControl
    {
        get { return this.tileControl; }
        set { this.tileControl = value; }
    }

    public ContractDetailControl DetailControl
    {
        get { return this.detailControl; }
        set { this.detailControl = value; }
    }

    public ContractControl()
    {
        this.contractMainDiv = new HtmlGenericControl("div");
        this.contractMainDiv.ID = "contractMainDiv";
        this.contractMainDiv.Attributes.Add("class", "contractMain");
    }

    #region protected override void OnPreRender(EventArgs e)
    protected override void OnPreRender(EventArgs e)
    {
        base.OnPreRender(e);
        //CreateChildControls();
    }
    #endregion

    #region protected override void CreateChildControls()
    protected override void CreateChildControls()
    {
        base.CreateChildControls();
        if (tileControl != null)
        {
            this.contractMainDiv.Controls.Add(tileControl);
        }

        if (detailControl != null)
        {
            this.contractMainDiv.Controls.Add(detailControl);
        }
        this.Controls.Add(contractMainDiv);
        //base.CreateChildControls();
    }


    #endregion

    protected override void OnLoad(EventArgs e)
    {
        base.OnLoad(e);
        CreateChildControls();
    }

    protected override void OnInit(EventArgs e)
    {
        base.OnLoad(e);
        EnsureChildControls();
    }
}

其中ContractTileControl和ContractDetailControl是从CompositeControl派生的另一个自定义控件。

当我将它们添加到asp:PlaceHolder控件集时，它们渲染得很好，但是当我定义一个转发器时：

<asp:Repeater ID="myRepeater" runat="server" >
    <HeaderTemplate>
        <table border="0" cellpadding="0" cellspacing="0">
    </HeaderTemplate>

    <ItemTemplate>
        <tr><td><easit:ContractControl ID="contractControl" runat="server" />
        </td></tr>
    </ItemTemplate>
    <FooterTemplate>
        </table>
    </FooterTemplate>
</asp:Repeater>

并将它们绑定到它：

private void FillContractPlaceHolder()
    {

        List<ContractControl> controls = new List<ContractControl>();
        foreach(KeyValuePair<Customer, List<TFSContract>> pair in contractList)
        {
            Label customerNameLbl = new Label();
            customerNameLbl.ID = "customerNameLbl";
            customerNameLbl.CssClass = "customerName";
            customerNameLbl.Text = pair.Key.Name;
            contractListPlaceHolder.Controls.Add(customerNameLbl);

            foreach (TFSContract contract in pair.Value)
            {
                ContractStatusBarControl status = new ContractStatusBarControl();
                status.WidthPercent = GetFillPercent(contract.NumberOfTasks, contract.NumberOfFinishedTasks);

                string[] contractNameParts = Regex.Split(contract.Contract.Name, @"[A-Z]{3}-[0-9|A-Z]{2}-[0-9|A-Z]{2}", RegexOptions.IgnoreCase);

                ContractDetailControl detail = new ContractDetailControl();
                detail.ContractName = contractNameParts.Last();
                detail.DateStarted = contract.StartDate;
                detail.DateFinished = contract.FinishDate;
                detail.StatusBar = status;

                ContractTileControl tile = new ContractTileControl();
                Match match = Regex.Match(contract.Contract.Name, @"[A-Z]{3}-[0-9|A-Z]{2}-[0-9|A-Z]{2}", RegexOptions.IgnoreCase);
                if (match.Value.Length != 0)
                {
                    tile.ContractNumber = match.Value;
                }

                tile.ContractTasksFinished = contract.NumberOfFinishedTasks;
                tile.ContractTasksTotal = contract.NumberOfTasks;

                ContractControl contractControl = new ContractControl();
                contractControl.ContractID = contract.Contract.Id;
                contractControl.TileControl = tile;
                contractControl.DetailControl = detail;
                //contractListPlaceHolder.Controls.Add(contractControl);
                controls.Add(contractControl);
            }


        }

        myRepeater.DataSource = controls;
        myRepeater.DataBind();

    }

表已创建，但只有contractMainDiv的非复合部分ContractControl会被呈现，因为Repeater坚持tileControl和detailControl都为空，甚至虽然它们已正确设置为各自类型的实例。

Answer 1

当Repeater受数据限制时，它会为数据源中的每个项目创建ItemTemplate的实例，并将其DataItem设置为数据源中的项目和数据绑定孩子们。

在这种情况下，数据源中的项目是ContractControl的实例，而您的ItemTemplate没有数据绑定，因此您最终会得到一个空白的实例您已添加到列表中的每个项目ContractControl。

快速而肮脏的解决方案是为ItemDataBound的{{1}}事件添加处理程序，并将属性复制到实际控件：

Repeater

更好的解决方案是将protected void myRepeater_ItemDataBound(object sender, RepeaterItemEventArgs e) { switch (e.Item.ItemType) { case ListItemType.Item: case ListItemType.AlternatingItem: case ListItemType.SelectedItem: case ListItemType.EditItem: { var source = (ContractControl)e.Item.DataItem; var destination = (ContractControl)e.Item.FindControl("contractControl"); destination.ContractID = source.ContractID; destination.TileControl = source.TileControl; destination.DetailControl = source.DetailControl; break; } } }绑定到Repeater个对象列表，然后移动代码以将TFSContract构建到ContractControl事件处理程序中。< / p>

修改
更新为仅处理实际项目，忽略页眉，页脚等。

将List <compositecontrol>绑定到Repeater </compositecontrol>

1 个答案: