自定義用戶控件中的ASP嵌套標記

Question

我剛剛開始使用C＃中的自定義用戶控件，我想知道是否有任何關於如何編寫接受嵌套標簽的示例？

例如，在創建asp:repeater ，可以為itemtemplate添加嵌套標記。

Answer 1

我前段時間寫了一篇關於此的博文 。 簡而言之，如果您有一個帶有以下標記的控件：

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

您需要控件中的代碼遵循以下方式：

[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; }
}

Answer 2

我跟隨Rob的博客文章，做了一個略微不同的控制。 控件是有條件的，就像if子句一樣：

<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>

在代碼中，然后將控件的HasDiscount屬性設置為布爾值，該布爾值決定呈現哪個子句。

與Rob的解決方案的最大區別在於，控件中的子句實際上可以保存任意HTML / ASPX代碼。

以下是控件的代碼：

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);
        }
    }
}

Answer 3

我得到了一些非常類似於Rob （在回歸 檔案中 ） @ gudmundur-h的答案的東西，但是我使用了ITemplate來擺脫煩人的“你不能在X標簽之間放置內容”的用法。 我不完全確定實際需要與否，所以這一切都是為了以防萬一。

部分/用戶控制標記： mycontrol.ascx

請注意重要的位： plcChild1和plcChild2 。

<!-- markup, controls, etc -->
<div class="shell">
    <!-- etc -->

    <!-- optional content with default, will map to `ChildContentOne` -->
    <asp:PlaceHolder ID="plcChild1" runat="server">
        Some default content in the first child.
        Will show this unless overwritten.
        Include HTML, controls, whatever.
    </asp:PlaceHolder>

    <!-- etc -->

    <!-- optional content, no default, will map to `ChildContentTwo` -->
    <asp:PlaceHolder ID="plcChild2" runat="server"></asp:PlaceHolder>

</div>

部分/用戶控制代碼隱藏： mycontrol.ascx.cs

[ParseChildren(true), PersistChildren(true)]
[ToolboxData(false /* don't care about drag-n-drop */)]
public partial class MyControlWithNestedContent: System.Web.UI.UserControl, INamingContainer {
    // expose properties as attributes, etc

    /// <summary>
    /// "attach" template to child controls
    /// </summary>
    /// <param name="template">the exposed markup "property"</param>
    /// <param name="control">the actual rendered control</param>
    protected virtual void attachContent(ITemplate template, Control control) {
        if(null != template) template.InstantiateIn(control);
    }

    [PersistenceMode(PersistenceMode.InnerProperty),
    DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
    public virtual ITemplate ChildContentOne { get; set; }

    [PersistenceMode(PersistenceMode.InnerProperty), DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
    public virtual ITemplate ChildContentTwo { get; set; }

    protected override void CreateChildControls() {
        // clear stuff, other setup, etc
        // needed?
        base.CreateChildControls();

        this.EnsureChildControls(); // cuz...we want them?

        // using the templates, set up the appropriate child controls
        attachContent(this.ChildContentOne, this.plcChild1);
        attachContent(this.ChildContentTwo, this.plcChild2);
    }
}

重要位（？）：

• ParseChildren - 所以出現了什么？
• PersistChildren - 所以動態創建的東西不會被重置？
• PersistenceMode(PersistenceMode.InnerProperty) - 因此可以正確解析控件
• DesignerSerializationVisibility(DesignerSerializationVisibility.Content) - 同上？

控件用法

<%@ Register Src="~/App_Controls/MyStuff/mycontrol.ascx" TagPrefix="me" TagName="MyNestedControl" %>

<me:MyNestedControl SomeProperty="foo" SomethingElse="bar" runat="server" ID="meWhatever">
    <%-- omit `ChildContentOne` to use default --%>
    <ChildContentTwo>Stuff at the bottom! (not empty anymore)</ChildContentTwo>
</me:MyNestedControl>

Answer 4

我的猜測是你在找這樣的東西？ http://msdn.microsoft.com/en-us/library/aa478964.aspx

您的標簽已刪除或不可見，因此無法真正幫助您。