<%$, <%@, <%=, <%# ... 怎么回事? [英] <%$, <%@, <%=, <%# ... what's the deal?

问题描述

我用经典的 ASP 和 ASP.NET 编程，我在服务器端代码的标记中看到了不同的标记.

I've programmed in both classic ASP and ASP.NET, and I see different tags inside of the markup for server side code.

我最近遇到了一个 MSDN 上的好博客 介绍了两者之间的区别:

I've recently come across a good blog on MSDN that goes over the difference between:

• <%=(百分比加上等号)和
• <%#(百分号和哈希/磅/八索)

• <%= (percentage together with equals sign) and
• <%# (percent sign and hash/pound/octothorpe)

(<%# 仅在数据绑定时评估，而 <%= 在渲染时评估)，但我也看到:

(<%# is evaluated only at databind, and <%= is evaluated at render), but I also see:

• <%$(百分比和美元符号)和
• <%@(百分号和 at 符号).

• <%$ (percent and dollar sign) and
• <%@ (percent sign and at symbol).

我相信 <%@ 加载程序集之类的东西，也许 <%$ 从配置文件加载东西?我不太确定.

I believe <%@ loads things like assemblies and perhaps <%$ loads things from config files? I'm not too sure.

我只是想知道是否有人可以为我澄清所有这些，并可能解释为什么创建这么多看似具有相似目的的不同标签很重要?

I was just wondering if anyone could clarify all of this for me and possibly explain why it's important to create so many different tags that seemingly have a similar purpose?

推荐答案

• <% %> - 用于 内联代码(尤其是逻辑流程)
• <%$ %> - 用于 评估表达式(如资源变量)
• <%@%> - 用于 页面指令、注册程序集、导入命名空间等
• <%= %> - 是 Response.Write 的简写(讨论 这里)
• <%# %> - 用于数据绑定表达式.
• <%: %> - 是 Response.Write(Server.HTMLEncode()) ASP.net 4.0+
• <%#: %> - 用于数据绑定表达式并自动进行HTML编码.
• <%-- --%> - 用于 服务器端评论
• <% %> - is for inline code (especially logic flow)
• <%$ %> - is for evaluating expressions (like resource variables)
• <%@ %> - is for Page directives, registering assemblies, importing namespaces, etc.
• <%= %> - is short-hand for Response.Write (discussed here)
• <%# %> - is used for data binding expressions.
• <%: %> - is short-hand for Response.Write(Server.HTMLEncode()) ASP.net 4.0+
• <%#: %> - is used for data binding expressions and is automatically HTMLEncoded.
• <%-- --%> - is for server-side comments

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