目录###
1. 什么是Razor
2. Razor C# 基本语法规则
3. 逻辑条件与循环
4. ASP.NET MVC 中 Razor 布局
razor
1. 什么是Razor ?
- Razor 不是一种编程语言,而是一种标记语法,可以将基于服务器的代码(Visual Basic 和 C#)嵌入到网页中。
- Razor 是基于 ASP.NET 的,是为创建 Web 应用程序而设计的。
- Razor支持代码混写。
- 带 Razor 语法的 ASP.NET 网页有特殊的文件扩展名cshtml(Razor C#)或者vbhtml(Razor VB)。
2. Razor C#基本语法规则
① 使用@
将代码块添加到页面中
- 内联表达式(Inline expressions)
- 单语句块(Single statement blocks)
- 多语句块(Multi-statement block)
<!-- Inline expressions -->
<p>You are using @Request.Broswer.Broswer!</p>
<!-- Single statement blocks -->
@{ ViewBag.title = "Home Page"; }
@{ var myMessage = "Hello World"; }
<!-- Multi-statement block -->
@{
var name = "Jason";
var greeting = "Nice to meet you, ";
var greetingMessage = greeting + name;
}
<p>The greeting is: @greetingMessage</p>
② 代码块括在大括号中,代码语句用分号结束
③ 使用 var
关键字,声明变量存储值
<!-- Storing a string -->
@{ var welcomeMessage = "Welcome, new members!"; }
<p>@welcomeMessage</p>
<!-- Storing a date -->
@{ var year = DateTime.Now.Year; }
④ 字符串要用引号括起来
@{ var myString = "This is just an example"; }
⑤ C#代码是区分大小写
⑥ 空格和换行符不影响语句
- 可以通过增加空格或者换行符提高代码的可读性。
- 但是对于字符串,不可以
@{ var test = "This is a long
string"; } // Does not work!
⑦ 内联的helper方法
@helper formatAmount(decimal amount)
{
var color = "green";
if (amount < 0)
{
color = "red";
}
<span style="color:@color">@String.Format("{0:c}", amount)</span>
}
然后可以在其他地方使用helper方法,比如:
@{var amounts = new List<decimal> {100, 25.50m, -40, 276.99m}
}
<ul>
@foreach(decimal amount in amounts)
{
<li>@formatAmount(amount)</li>
}
</ul>
⑧ @{}
中的内容都会被视为C#代码
- 如果想要添加纯文本,两种方法
@ {
//方法1
<text>djskfadsfhadsjfk</text>
//方法2
@: fhdshfjskhfksfs
}
- 输出
@
符号
@ { <p>Have a good weekend @@LA</p> }
//output: Have a good weekend @LA
⑨ 注释
- 使用
@**@
@* A one-line code comment. *@
@*
This is a multiline code comment.
It can continue for any number of lines.
*@
- 在
@{}
中使用C#的注释格式
@{
// This is a comment.
var myVar = 17;
/* This is a multi-line comment
that uses C# commenting syntax. */
}
3. 逻辑条件与循环
- If-else, else if 语句
@ { var price = 25; }
<body>
@if (price >= 30)
{
<p>The price is high.</p>
}
else if (price > 20 && price < 30)
{
<p>The price is OK.</p>
}
else
{
<p>The price is low.</p>
}
</body>
- Switch 语句
@ { var day = "Monday"; }
<body>
@switch(day)
{
case "Monday":
message="This is the first weekday.";
break;
case "Thursday":
message="Only one day before weekend.";
break;
case "Friday":
message="Tomorrow is weekend!";
break;
default:
message="Today is " + day;
break;
}
- For 循环
<!-- 方式1 -->
@for (int i = 0; i < 10; i++)
{
@:@i
}
<!-- 方式2 -->
@{
for (int i = 0; i < 10; i++)
{
//do something
}
}
- While 循环
<body>
@{
var i = 0;
while (i < 5)
{
i += 1;
<p>Output is: @i</p>
}
}
</body>
- Foreach 循环
//定义一个数组
@{var amounts = new List<decimal> {100, 25.50m, -40, 276.99m}
}
//使用foreach遍历数组
<ul>
@foreach(decimal amount in amounts)
{
<li>@amount</li>
}
</ul>
4. ASP.NET MVC 中Razor布局
Views folder- 在_ViewStart.cshtml中, 可以定义所有view的默认layout模板
@{
Layout = "~/Views/Shared/_Layout.cshtml";
}
- _Layout.cshtml即模板页,起到页面整体框架重用的目的
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>@ViewBag.Title</title>
@Styles.Render("~/Content/css")
@Scripts.Render("~/bundles/modernizr")
</head>
<body>
@Html.Partial("_header")
<div class="navbar navbar-inverse navbar-fixed-top">
<div class="container">
<div class="navbar-collapse collapse">
<ul class="nav navbar-nav">
<li>@Html.ActionLink("Home", "Index", "Home")</li>
<li>@Html.ActionLink("About", "About", "Home")</li>
<li>@Html.ActionLink("Contact", "Contact", "Home")</li>
</ul>
@Html.Partial("_LoginPartial")
</div>
</div>
</div>
<div class="container body-content">
<div class="row">
<div class="col-md-12">
<img src="~/Content/Images/logo.png" class="img-responsive item-center"/>
</div>
</div>
@RenderBody()
</div>
@Scripts.Render("~/bundles/jquery")
@RenderSection("scripts", required: false)
@Html.Partial("_footer")
</body>
</html>
- @Html.Partial()
HtmlHelper.Partial(),可以将页头、页脚、登陆等局部视图加载进来 - @RenderBody()
将对应View页面的主内容替换到此 - @RenderSection()
将对应View页面的相应的section部分替换到此
相关资料
- Introduction to ASP.NET Web Programming Using the Razor Syntax (C#)
- C# Razor Syntax Quick Reference
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