In ASP.NET MVC 2 <%: tag was introduced to replace <%= for Html helpers. But what does it mean and what is the difference to the previous one? When shall I use <%= and when <%:?
在ASP.NET MVC 2中引入了<％：标记来替换<％=用于Html帮助程序。但这是什么意思，与前一个有什么不同？我应该何时使用<％=和何时<％：？
Thank you
谢谢
3 个解决方案
#1
14
In ASP.NET 4 the <%: xyz %> syntax will do the same thing as <%= Server.HtmlEncode(xyz) %> did in previous versions. It is simply a shortcut because it is used so often.
在ASP.NET 4中，<％：xyz％>语法将与先前版本中的<％= Server.HtmlEncode（xyz）％>执行相同的操作。它只是一个捷径，因为它经常被使用。
As Richard says below, it can also determine if a string does not need to be encoded based on whether or not it implements the IHtmlString interface.
正如Richard在下面所说，它还可以确定是否需要根据字符串是否实现IHtmlString接口来编码字符串。
#2
8
IIRC, <%: automatically provides HTML encoding so you don't need to do it yourself.
IIRC，<％：自动提供HTML编码，因此您无需自己动手。
From Scott Guthrie's blog post:
来自Scott Guthrie的博文：
With ASP.NET 4 we are introducing a new code expression syntax (
<%: %>) that renders output like<%= %>blocks do – but which also automatically HTML encodes it before doing so.在ASP.NET 4中，我们引入了一种新的代码表达式语法（<％：％>），它可以像<％=％>块一样呈现输出 - 但在执行此操作之前，它还会自动对HTML进行编码。
Read the blog post for a lot more detail.
阅读博客文章了解更多详情。
#3
3
<%= Injects the value directly whereas <%: automatically escapes all of the scary special characters for you.
<％=直接注入值，而<％：自动为您转义所有可怕的特殊字符。
In other words,
换一种说法，
<%: myString %>
<％：myString％>
is the same as
是相同的
<%= Server.HtmlEncode(myString) %>
<％= Server.HtmlEncode（myString）％>
#1
14
In ASP.NET 4 the <%: xyz %> syntax will do the same thing as <%= Server.HtmlEncode(xyz) %> did in previous versions. It is simply a shortcut because it is used so often.
在ASP.NET 4中，<％：xyz％>语法将与先前版本中的<％= Server.HtmlEncode（xyz）％>执行相同的操作。它只是一个捷径，因为它经常被使用。
As Richard says below, it can also determine if a string does not need to be encoded based on whether or not it implements the IHtmlString interface.
正如Richard在下面所说，它还可以确定是否需要根据字符串是否实现IHtmlString接口来编码字符串。
#2
8
IIRC, <%: automatically provides HTML encoding so you don't need to do it yourself.
IIRC，<％：自动提供HTML编码，因此您无需自己动手。
From Scott Guthrie's blog post:
来自Scott Guthrie的博文：
With ASP.NET 4 we are introducing a new code expression syntax (
<%: %>) that renders output like<%= %>blocks do – but which also automatically HTML encodes it before doing so.在ASP.NET 4中，我们引入了一种新的代码表达式语法（<％：％>），它可以像<％=％>块一样呈现输出 - 但在执行此操作之前，它还会自动对HTML进行编码。
Read the blog post for a lot more detail.
阅读博客文章了解更多详情。
#3
3
<%= Injects the value directly whereas <%: automatically escapes all of the scary special characters for you.
<％=直接注入值，而<％：自动为您转义所有可怕的特殊字符。
In other words,
换一种说法，
<%: myString %>
<％：myString％>
is the same as
是相同的
<%= Server.HtmlEncode(myString) %>
<％= Server.HtmlEncode（myString）％>