Question

我创建了一个名为“ AlertBox”的UserControl，它具有属性“ AlertText”，我可以这样使用它：

<uc1:AlertBox ID="AlertBox1" runat="server" AlertText="This is an alert" />

但是，我希望能够将HTML或其他控件添加为以下子控件：

<uc1:AlertBox ID="AlertBox1" runat="server">
    <p>Please click the button below to continue.</p>
    <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Continue" />
</uc1:AlertBox>

我希望这实质上是Label控件的工作方式，您可以在其中为它的Text属性分配值或添加子内容。我查看了Label控件（https://referencesource.microsoft.com/#System.Web/UI/WebControls/Label.cs,508f83e965a6ff4b）的.NET源代码，并且看到了Text属性的以下实现：

[
    Localizable(true),
    Bindable(true),
    WebCategory("Appearance"),
    DefaultValue(""),
    WebSysDescription(SR.Label_Text),
    PersistenceMode(PersistenceMode.InnerDefaultProperty)
]
public virtual string Text {
    get {
        object o = ViewState["Text"];
        return((o == null) ? String.Empty : (string)o);
    }
    set {
        if (HasControls()) {
            Controls.Clear();
        }
        ViewState["Text"] = value;
    }
}

看起来PersistenceMode属性可能是允许我获得所需内容的关键，但是在我的代码中，我已经添加了它，并且在执行此类操作时也已添加

<uc1:AlertBox ID="AlertBox1" runat="server">
    This is an alert
</uc1:AlertBox>

[DefaultValue(""), PersistenceMode(PersistenceMode.InnerDefaultProperty)]
public string AlertText
{
    get
    {
        if (ViewState[nameof(AlertText)] == null)
            ViewState[nameof(AlertText)]= "";

        return (string)ViewState[nameof(AlertText)];
    }

    set
    {
        if (HasControls())
            Controls.Clear();

        ViewState[nameof(AlertText)] = value;
    }
}

我收到以下错误：

Server Error in '/' Application.
Parser Error
Description: An error occurred during the parsing of a resource required to service this request. Please review the following specific parse error details and modify your source file appropriately. 

Parser Error Message: Literal content ('This is an alert') is not allowed within a 'ASP.controls_alertbox_ascx'.

Source Error: 

Line 15: 
Line 16:    <uc1:AlertBox ID="AlertBox1" runat="server">
Line 17:        This is an alert
Line 18:    </uc1:AlertBox>
Line 19: 

Source File: /Members/Home.aspx    Line: 17 

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.3160.0

我是否正在尝试使用WebControl（.ascx）进行操作，还是需要将其实现为UserControl？我也不想使它成为模板控件。

我想在UserControl中允许子内容

0 个答案: