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ASP.NET MVC4 Razor
1 Code Expressions 代码表达式
@表达式 or @(Expressions )
例如1: <h1>Listing @stuff.Length items.</h1
Razor peeks at the next character and sees an angle bracket, which isn’t a valid identifier and transitions back into markup mode
例如2:
@{
string rootNamespace = "MyApp";
}
<span>@rootNamespace.Models</span>
What hope to output was :
<span>MyApp.Models</span>
必须这样写:<span>@(rootNamespace).Models</span> ,通过括号来标记语法结束。
example 3:
How to show an e-mail address:
<span>support@megacorp.com</span> Razor 语法能智能识别 一个 正确的e-mail 地址
但是像微博这种,@名字 ,则需要转义输出:
<p>
You should follow
@haacked, @jongalloway, @bradwilson, @odetocode
</p>
You can do so by using @@ sing ,just like that:
<p>
You should follow
@@haacked, @@jongalloway, @@bradwilson, @@odetocode
</p>
2 HTML Encoding
为了跨站点的脚本攻击,Razor 语法会直接将脚本代码编码输出。
@{
string message = "<script>alert(‘haacked!‘);</script>";
}
<span>@message</span>
输出:
<span><script>alert('haacked!');</script></span>
此条实际测试时(chrome版本 37.0.2062.120 m,IE11)均显示为: <span><script>alert(‘haacked!‘);</script></span>
如果需要原样输出 代码文本 需要使用 @Html.Raw():
@{
string message = "<strong>This is bold!</strong>";
}
<span>@Html.Raw(message)</span>
输出:
<span><strong>This is bold!</strong></span>
实际测试: 显示为:This is bold! 当作html标记执行了!!!
如果 message ="<script>alert(‘haacked!‘);</script>"; 那么
<span>@Html.Raw(message)</span> 会弹出一个 haacked! 对话框,执行js脚本!
可以在 Jquery 语法中使用 Razor语法:
<script type="text/javascript">
$(function () {
var message = ‘Hello @ViewBag.Title‘;
$("#message").html(message).show(‘slow‘);
});
</script>
结果: Hello My Sample title
可以使用 @Ajax.JavaScriptStringEncode(string value) 对 字符内容进行编码
3 Code Block 代码块
@{ } 代码块
例如:
@{
string s = "One line of code.";
ViewBag.Title "Another line of code";
}
@foreach(){} , @while() {} ;@for(){} 循环代码块
@if(){} ; 条件块
@* *@ 注释块
例如:
@foreach (Mvc4App.Models.LoginModel login in ViewBag.LoginModels)
{
UserName:<li>@login.UserName</li>
}
4 Layouts
用来呈现布局设计。@RenderBody()
例如: 主布局:SiteLayout.cshtml 文件
<!DOCTYPE html> |
使用布局文件 index.cshtml
@{
Layout = "~/Views/Shared/SiteLayout.cshtml";
View.Title = "The Index!";
}
<p>This is the main content!</p>
---------------------------------------------
呈现 布局段 @RenderSection()
<!DOCTYPE html>
<html>
<head><title>@ViewBag.Title</title></head>
<body>
<h1>@ViewBag.Title</h1>
<div id="main-content">@RenderBody()</div>
<footer>@RenderSection("Footer")</footer>
</body>
</html>
更新index.cshtml
@{
Layout = "~/Views/Shared/SiteLayout.cshtml";
View.Title = "The Index!";
}
<p>This is the main content!</p>
@section Footer {
This is the <strong>footer</strong>.
}
-------------------------------------------------------
如果有些需要呈现,有些不需要,可以使用RenderSection 的重载方法:
<footer>@RenderSection("Footer", required: false)</footer>
还可以判断段是否存在
<footer>
@if (IsSectionDefined("Footer")) {
RenderSection("Footer");
}
else {
<span>This is the default footer.</span>
}
</footer>
------------------------------------------------------------
5 分布视图 partial view
在HomeControl 中添加Action
public ActionResult Partial()
{
ViewBag.Part = "this is partial view";
return PartialView();
}
右键添加视图partial.cshtml,分布视图不能使用Layout 属性。
<div>
<p>Hello @ViewBag.Part</p>
</div>
分布视图与一般视图可以一样的方式浏览 http://localhost:46918/home/partial
分布视图可以同Ajax 配合,直接加载:
<input type="button" value="http://www.mamicode.com/click me to load partial view" onclick="loadPartil()" />
<div id="result"></div>
<script type="text/javascript">
function loadPartil() {
$(‘#result‘).load(‘/home/partial‘);
}
</script>
ASP.NET MVC4 Razor