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Razor is a markup syntax that allows you to embed server-based code (C #) into a Web page, a template engine that Microsoft has introduced for ASP.
C # 's main Razor syntax rules<!--single-line code block -@{var mymessage = "Hello World";}<!--in-line expressions or variables -<P>The value of Mymessage is: @myMessage</P> <!--multi-line statement code block -@{var greeting = "Welcome to our site!"; var WeekDay = Datetime.now.dayofweek;var GreetingMessage = greeting + "Here's Huston it is:" + weekDay;}<P>The greeting is: @greetingMessage</P>
Dealing with objects
Server code often involves objects.
The "Date" object is a typical ASP. NET built-in object, but you can also define your own object, a Web page, a text box, a file, or a database record, and so on.
Objects can have methods that can be executed. Database records can provide a "save" method, the image object can have a "rotation" method, the E-mail object can provide a "send" method, and so on.
Objects can also have properties that describe their characteristics. Database records can have FirstName and LastName properties.
The ASP. NET Date object has the Now property (written as Date.now), and the now property has the day property (written as Date.Now.Day). The following example shows how to access some properties of a Date object:
<TableBorder= "1"><TR><thwidth= "100px">Name</th><TDwidth= "100px">Value</TD></TR><TR><TD>Day</TD><TD>@DateTime. Now.day</TD></TR><TR><TD>Hour</TD><TD>@DateTime. Now.hour</TD></TR><TR><TD>Minute</TD><TD>@DateTime. Now.minute</TD></TR><TR><TD>Second</TD><TD>@DateTime. Now.second</TD></TR></TD></Table>Read user input
Another important feature of dynamic Web pages is the reading of user input.
The input is read by the request[] function and tested by the IsPost condition:
@{var totalmessage = ""; if (IsPost) {var num1 = request["Text1"]; var num2 = request["Text2"]; var total = Num1. Asint () + num2. Asint (); Totalmessage = "Total =" + total; }}<HTML><Bodystyle= "Background-color:beige; Font-family:verdana, Arial;"><formAction=""Method= "POST"><P><label for= "Text1">First Number:</label><BR><inputtype= "text"name= "Text1" /></P><P><label for= "Text2">Second Number:</label><BR><inputtype= "text"name= "Text2" /></P><P><inputtype= "Submit"value= "Add" /></P></form><P>@totalMessage</P></Body></HTML>converting data types
It is sometimes useful to convert one data type to another.
The most common example is converting a string input to another type, such as an integer or a date.
As a rule, user input becomes a string, even if the user enters a number. Therefore, the numeric input value must be converted to a number before it is used for calculation.
The following is a list of common conversion methods:
| Method | Description | Example |
|---|---|---|
|
Converts a string to an integer. | if (Mystring.isint ()) {Myint=mystring.asint ();} |
|
Converts a string to a floating-point number. | if (Mystring.isfloat ()) {myfloat=mystring.asfloat ();} |
|
Converts a string to a decimal number. | if (Mystring.isdecimal ()) {Mydec=mystring.asdecimal ();} |
|
Convert a string to an ASP. NET DateTime Type | Mystring= "10/10/2012"; Mydate=mystring.asdatetime (); |
|
Converts a string to a logical value. | Mystring= "True"; Mybool=mystring.asbool (); |
| ToString () | Converts any data type to a string. | myint=1234; Mystring=myint.tostring (); |
Understanding the Razor View engine in ASP.
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