目錄###
1. 什么是Razor
2. Razor C# 基本語法規(guī)則
3. 邏輯條件與循環(huán)
4. ASP.NET MVC 中 Razor 布局

razor
1. 什么是Razor ?
- Razor 不是一種編程語言,而是一種標(biāo)記語法,可以將基于服務(wù)器的代碼(Visual Basic 和 C#)嵌入到網(wǎng)頁中。
- Razor 是基于 ASP.NET 的,是為創(chuàng)建 Web 應(yīng)用程序而設(shè)計(jì)的。
- Razor支持代碼混寫。
- 帶 Razor 語法的 ASP.NET 網(wǎng)頁有特殊的文件擴(kuò)展名cshtml(Razor C#)或者vbhtml(Razor VB)。
2. Razor C#基本語法規(guī)則
① 使用@將代碼塊添加到頁面中
- 內(nèi)聯(lián)表達(dá)式(Inline expressions)
- 單語句塊(Single statement blocks)
- 多語句塊(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 代碼塊括在大括號中,代碼語句用分號結(jié)束
③ 使用 var 關(guān)鍵字,聲明變量存儲(chǔ)值
<!-- Storing a string -->
@{ var welcomeMessage = "Welcome, new members!"; }
<p>@welcomeMessage</p>
<!-- Storing a date -->
@{ var year = DateTime.Now.Year; }
④ 字符串要用引號括起來
@{ var myString = "This is just an example"; }
⑤ C#代碼是區(qū)分大小寫
⑥ 空格和換行符不影響語句
- 可以通過增加空格或者換行符提高代碼的可讀性。
- 但是對于字符串,不可以
@{ var test = "This is a long
string"; } // Does not work!
⑦ 內(nèi)聯(lián)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 @{}中的內(nèi)容都會(huì)被視為C#代碼
- 如果想要添加純文本,兩種方法
@ {
//方法1
<text>djskfadsfhadsjfk</text>
//方法2
@: fhdshfjskhfksfs
}
- 輸出
@符號
@ { <p>Have a good weekend @@LA</p> }
//output: Have a good weekend @LA
⑨ 注釋
- 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#的注釋格式
@{
// This is a comment.
var myVar = 17;
/* This is a multi-line comment
that uses C# commenting syntax. */
}
3. 邏輯條件與循環(huán)
- If-else, else if 語句
@ { 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 語句
@ { 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 循環(huán)
<!-- 方式1 -->
@for (int i = 0; i < 10; i++)
{
@:@i
}
<!-- 方式2 -->
@{
for (int i = 0; i < 10; i++)
{
//do something
}
}
- While 循環(huán)
<body>
@{
var i = 0;
while (i < 5)
{
i += 1;
<p>Output is: @i</p>
}
}
</body>
- Foreach 循環(huán)
//定義一個(gè)數(shù)組
@{var amounts = new List<decimal> {100, 25.50m, -40, 276.99m}
}
//使用foreach遍歷數(shù)組
<ul>
@foreach(decimal amount in amounts)
{
<li>@amount</li>
}
</ul>
4. ASP.NET MVC 中Razor布局

Views folder
- 在_ViewStart.cshtml中, 可以定義所有view的默認(rèn)layout模板
@{
Layout = "~/Views/Shared/_Layout.cshtml";
}
- _Layout.cshtml即模板頁,起到頁面整體框架重用的目的
<!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(),可以將頁頭、頁腳、登陸等局部視圖加載進(jìn)來 - @RenderBody()
將對應(yīng)View頁面的主內(nèi)容替換到此 - @RenderSection()
將對應(yīng)View頁面的相應(yīng)的section部分替換到此
相關(guān)資料
- Introduction to ASP.NET Web Programming Using the Razor Syntax (C#)
- C# Razor Syntax Quick Reference