Razor view engine-basic syntax

Original article: razor view engine-basic syntax

All codes starting with @ or @ {/* Code body */} (no spaces can be added directly to @ and {) will be processed by the ASP. NET engine.
Each line of code in @ {/* Code body */} must end with ";", as shown in
@{
VaR I = 10;
Var y = 20;
}
@ Xxx does not need to end with ";", as shown in figure
@ I output 10
@ Y; output 20;
Uppercase/lowercase letters in the code area.
Character Type constants must be enclosed by "", for example, @ {string STR = "my string ";}
-Note-

To output the "@" character on the page
You can use html ascii Encoding & #64;
Of course, Razor also provides the smart analysis function: if the first character of @ is not a blank character, ASP. NET will not process it.
For example, <p> [email protected] XX </P> outputs [email protected] xx

Single Row Syntax:
@ {Var I = 10 ;}
Multiline Syntax:

@{ 

    var I = 10;

    Var y = 20;

}

1. When using local variables, Razor does not support access modifiers (public, private, etc.), which makes no sense)
Define local variables on a single row
@ {Var Total = 7 ;}
@ {Var mymessage = "Hello World ";}
Define local variables on multiple rows

@{

    var greeting = "Welcome to our site!";

    var weekDay = DateTime.Now.DayOfWeek;

    var greetingMessage = greeting + " Today is: " + weekDay;

}

Use variables in the context

<p>The value of your account is: @total </p>

<p>The value of myMessage is: @myMessage</p>

Note:Variable concatenation output
@ {Var I = 10 ;}
<P> text @ I text </P>
But what if you want to output text10text?

<P> [email protected] {@ I} text </P>

<P> [email protected] Text </P>: [email protected] Text

<P> [email protected] </P> [email protected]

<P> text @ itext </P>

If the method name of the output variable does not need to be enclosed by @ {}, it can also take effect. However, remember to add a space before the @ character (thanks to spook for pointing out), for example:
<P> text @ I. tostring () text </P>
You can directly write the variable object: @ var1 @ var2 @ myobject. xx

2. Use logical processing

@{

    if (xx)

    {

    //do something

    }

    else

    {

    //do anything

    }

}

3. Use HTML tags inside @ {...}

@{

<p>text</P>

<div>div1</div>

}

4. output text inside @ {...}
Use @: to output a single line:

@{

    @:This is some text

    @:This is text too

@: @ I can also output variables

}

Use <text/> to output multiple rows:

@{

<text>

        tomorrow is good

        some girl is nice

</text>

}

5. Use comments inside @ {...}

@{

// Single line comment

    var i = 10;

    //defg

}

@ * Multi-line comment *@

    @* 

Multi-line comment

Multi-line comment

    *@

@{

    @*

Multi-line comment

Multi-line comment

    *@

    var i = 10;  @* asdfasf *@

}

<! -- You can also use C # default/*... */-->

@{

    /*

Multi-line comment

    */

}

If it is used inside @ {...} <! --> Comment, it is output to the page. If it is in <! --> If @ variable is used internally, it will be processed.
@{
<! -- Time now: @ datetime. Now. tostring () -->
}
Output: <! -- Time now: 4/9/2011 -->

6. type conversion
Asint (), isint ()
Asbool (), isbool ()
Asfloat (), isfloat ()
Asdecimal (), isdecimal ()
Asdatetime (), isdatetime ()
Tostring ()
Example:

@{

    var i = “10”;

}

<P> I = @ I. asint () </P> <! -- Output I = 10 -->

7. Use loop

<! -- Method 1 -->

@for (int i = 10; i < 11; i++)

{

    @:@i

}

<! -- Method 2 -->

@{

    for (int i = 10; i < 11; i++)

    {

        //do something

    }

}

<! -- While similarly -->