我刚刚开始使用cand中的"自定义用户控件"，我想知道是否有关于如何编写一个接受嵌套标签的示例。例如，当我们创建" asp：repeater"时，可以为" itemtemplate"添加一个嵌套标签。

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干杯

解决方案

不久前，我写了一篇有关此的博客文章。简而言之，如果我们具有带有以下标记的控件：

<Abc:CustomControlUno runat="server" ID="Control1">
    <Children>
        <Abc:Control1Child IntegerProperty="1" />
    </Children>
</Abc:CustomControlUno>

我们需要控件中的代码遵循以下原则：

[ParseChildren(true)]
[PersistChildren(true)]
[ToolboxData("<{0}:CustomControlUno runat=server></{0}:CustomControlUno>")]
public class CustomControlUno : WebControl, INamingContainer
{
    private Control1ChildrenCollection _children;

    [PersistenceMode(PersistenceMode.InnerProperty)]
    [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
    public Control1ChildrenCollection Children
    {
        get
        {
            if (_children == null)
            {
                _children = new Control1ChildrenCollection();
            }
            return _children;
        }
    }
}

public class Control1ChildrenCollection : List<Control1Child>
{
}

public class Control1Child
{
    public int IntegerProperty { get; set; }
}

我的猜测是我们正在寻找类似的东西吗？ http://msdn.microsoft.com/en-us/library/aa478964.aspx

标签已被删除或者不可见，因此无法真正为我们提供帮助。

我关注了Rob的博客文章，并进行了稍微不同的控制。该控件是一个有条件的控件，实际上就像一个if子句：

<wc:PriceInfo runat="server" ID="PriceInfo">
    <IfDiscount>
        You don't have a discount.
    </IfDiscount>
    <IfNotDiscount>
        Lucky you, <b>you have a discount!</b>
    </IfNotDiscount>
</wc:PriceInfo>

然后在代码中，将控件的" HasDiscount"属性设置为布尔值，该值决定要呈现哪个子句。

与Rob解决方案的最大区别在于，控件中的子句确实可以容纳任意HTML / ASPX代码。

这是控件的代码：

using System.ComponentModel;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebUtilities
{
    [ToolboxData("<{0}:PriceInfo runat=server></{0}:PriceInfo>")]
    public class PriceInfo : WebControl, INamingContainer
    {
        private readonly Control ifDiscountControl = new Control();
        private readonly Control ifNotDiscountControl = new Control();

        public bool HasDiscount { get; set; }

        [PersistenceMode(PersistenceMode.InnerProperty)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
        public Control IfDiscount
        {
            get { return ifDiscountControl; }
        }

        [PersistenceMode(PersistenceMode.InnerProperty)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
        public Control IfNotDiscount
        {
            get { return ifNotDiscountControl; }
        }

        public override void RenderControl(HtmlTextWriter writer)
        {
            if (HasDiscount)
                ifDiscountControl.RenderControl(writer);
            else
                ifNotDiscountControl.RenderControl(writer);
        }
    }
}