停止 asp:PlaceHolder 删除空格

发布于 2024-12-14 14:05:46 字数 660 浏览 4 评论 0原文

我遇到了 asp:PlaceHolder 的一些奇怪行为，它删除了其中 asp:Literal 之间的空格。

例如对于此代码：

<asp:PlaceHolder ID="PlaceHolder1" runat="server">
    <asp:Literal ID="Literal1" Text="aa" runat="server"></asp:Literal>
    <asp:Literal ID="Literal2" Text="bb" runat="server"></asp:Literal>
</asp:PlaceHolder>
<asp:Literal ID="Literal3" Text="cc" runat="server"></asp:Literal>
<asp:Literal ID="Literal4" Text="dd" runat="server"></asp:Literal>

输出将为aabb cc dd。

有没有办法阻止它删除空格（而不是通过在文字或 Text="aa " 之间添加   ）？

原文

I came across some strange behavior of asp:PlaceHolder, it removes whitespaces between the asp:Literals within it.

For example for this code:

<asp:PlaceHolder ID="PlaceHolder1" runat="server">
    <asp:Literal ID="Literal1" Text="aa" runat="server"></asp:Literal>
    <asp:Literal ID="Literal2" Text="bb" runat="server"></asp:Literal>
</asp:PlaceHolder>
<asp:Literal ID="Literal3" Text="cc" runat="server"></asp:Literal>
<asp:Literal ID="Literal4" Text="dd" runat="server"></asp:Literal>

The output will be aabb cc dd.

Is there is a way to stop it from removing the whitespaces (and not by adding between the literals or Text="aa ")?

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浅暮の光 2024-12-21 14:05:47

最优雅的解决方案是简单地重写 PlaceHolder：

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

namespace CustomControls
{
    [ToolboxData("<{0}:Holder ID='Holder1' runat='server'></{0}:Holder>"), ControlBuilder(typeof(ControlBuilder))]
    public sealed class Holder: PlaceHolder
    {
    }
}

这里的关键是使用 ControlBuilder 而不是 PlaceHolderControlBuilder，它只是重写它以始终返回 false 表示 AllowWhiteSpaceLiterals。

您可以将其用作任何其他 Web 控件：

<%@ Register TagPrefix="asp" Namespace="CustomControls" %>
<asp:Holder runat="server">...</asp:Holder>

The most elegant solution is to simply override PlaceHolder:

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

namespace CustomControls
{
    [ToolboxData("<{0}:Holder ID='Holder1' runat='server'></{0}:Holder>"), ControlBuilder(typeof(ControlBuilder))]
    public sealed class Holder: PlaceHolder
    {
    }
}

The key here is using ControlBuilder instead of PlaceHolderControlBuilder, which just overrides it to always return false for AllowWhiteSpaceLiterals.

You use it as any other web control:

<%@ Register TagPrefix="asp" Namespace="CustomControls" %>
<asp:Holder runat="server">...</asp:Holder>

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沉溺在你眼里的海 2024-12-21 14:05:47

我想出了两个解决方案：

第一：用asp:Panel替换asp:PlaceHolder。缺点是您会得到一个包装 div。

第二：在文字之间放置一个空的HTML注释

<asp:PlaceHolder ID="PlaceHolder1" runat="server">
    <asp:Literal ID="Literal1" Text="aa" runat="server"></asp:Literal><!>
    <asp:Literal ID="Literal2" Text="bb" runat="server"></asp:Literal>
</asp:PlaceHolder>

，是的，是合法的HTML注释。

I came up with two solutions:

First: To replace the asp:PlaceHolder with asp:Panel. The disadvantage is that you get a wrapping div.

Second: To put an empty HTML comment between the literals

<asp:PlaceHolder ID="PlaceHolder1" runat="server">
    <asp:Literal ID="Literal1" Text="aa" runat="server"></asp:Literal><!>
    <asp:Literal ID="Literal2" Text="bb" runat="server"></asp:Literal>
</asp:PlaceHolder>

And yes, <!> is a legal HTML comment.

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