我怎样才能穿过控制在用户控件找到一定的控制？ [英] How can I traverse controls in a user control to find a certain control?

问题描述

ASP.NET 2.0 Web表单

ASP.NET 2.0 Web forms

所以你怎么能透过用户控件的所有控件进行迭代，并查找某一类型的控制和事件追加到它？

So how can you iterate through all the controls in user control and find a certain type of control and append a event to it?

我有一个类似的问题<一href=\"http://stackoverflow.com/questions/5104377/how-do-i-add-a-event-to-an-asp-net-control-when-the-page-loads\">How我一个事件添加到ASP.NET控件在页面加载时与添加事件涉及 - 但这是，如果我想找到一个控制不同

I have a similar question How do I add a event to an ASP.NET control when the page loads? that deals with adding an event - but this is different if I wanted to find a control.

情景

控件是自定义控件：

<asp:Repeater runat="server" ID="options" OnItemDataBound="options_OnItemDataBound">
<HeaderTemplate>
    <table border="0" cellpadding="0" cellspacing="0" width="100%">
        <tr>
</HeaderTemplate>
<ItemTemplate>
            <td>
                <span>
                    <asp:Label runat="server" ID="optionName">
                    </asp:Label>
                    <asp:DropDownList runat="server" ID="optionValues" CssClass="PartOption">
                    </asp:DropDownList>
                </span>
            </td>
</ItemTemplate>
<FooterTemplate>
        </tr>
    </table>
</FooterTemplate>
</asp:Repeater>

在用户控件的自定义控件声明：

The custom control declaration on the user control:

<td><def:CustomControl id="somePartOptions" runat="server"></td>

在用户控件的背后code，我试着在Page_Load事件如下：

In the code behind of the user control, I tried the following in the Page_Load event:

    foreach(Control control in partOptions.Controls) {
            FindDropDownControl(control);
}

    protected void FindDropDownControl(Control controlContainer) {
        bool isRepeater = false;
        if (controlContainer is Repeater) {
            isRepeater = true;
        }

        if (controlContainer.HasControls()) {
            foreach (Control subControl in controlContainer.Controls) {
                FindDropDownControl(subControl);
            }
        }
    }

不过，布尔标志始终为false。所以，我在做什么？我最终想找到转发器的ItemTemplate中内DropDownList控件，但我甚至不能找到中继器。

However, the boolean flag is always false. So what am I doing? I am eventually wanting to find the dropdownlist control inside the itemTemplate of the repeater, but I can't even find the repeater.

感谢，

推荐答案

我用这个方法来获得容器控件列表（在每一层嵌套）：

I'm using this method to get list of control in container (on each nesting level):

    public static List<Control> GetControlsByType(Control ctl, Type type)
    {
        List<Control> controls = new List<Control>();

        foreach (Control childCtl in ctl.Controls)
        {
            if (childCtl.GetType() == type)
            {
                controls.Add(childCtl);
            }

            List<Control> childControls = GetControlsByType(childCtl, type);
            foreach (Control childControl in childControls)
            {
                controls.Add(childControl);
            }
        }

        return controls;
    }

您可以用此方式使用T：

You can use t in this way:

List<Control> repeaters = GetControlsByType(containerControl, typeof (Repeater));

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