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ASP. Net razor – introduction to VB loops and arrays

2022-07-04 12:16:00 【wx5a20cf699eb6f】

Razor Not a programming language . It's a server-side markup language .VB Loops and arrays ： Statements are repeated in the loop .

ASP.NET Razor – VB Introduction to loops and arrays _ Array

For loop

If you need to repeat the same statement , You can set a loop .

If you know how many times to loop , You can use for loop . This type of loop is particularly useful when counting up or down ：

example

      
      
       
       @For i=10 To 21    
       
       
@<p>Line #@i</p>
      
      
      
      
       
       1.
       
       2.

For Each loop

If you are using a collection or array , You will often use for each loop .

A collection is a group of similar objects ,for each The loop can traverse the collection until it is complete .

In the following example , Traverse ASP.NET Request.ServerVariables aggregate .

example

      
      
       
       @For Each x In Request.ServerVariables    
       
       
@<li>@x</li>
      
      
      
      
       
       1.
       
       2.

While loop

while A loop is a generic loop .

while Cycle to while Keyword start , Followed by parentheses , You can specify in parentheses how long the cycle will last , Then there are repeated code blocks .

while Loops usually set an increasing or decreasing variable to count .

In the following example ,+= Operator gives the variable... Every time the loop is executed i The value of the add 1.

example

      
      
       
       Do While 
       
       
i<5  
       
       
i += 1
       
       
@<p>Line #@i</p>
      
      
      
      
       
       1.
       
       2.
       
       3.
       
       4.

Array

When you want to store multiple similar variables, but you don't want to create a separate variable for each variable , You can use arrays to store ：

example

      
      
       
       Dim members As String()={"Jani","Hege","Kai","Jim"}
      
      
      
      
       
       1.

      
      
       
       i=Array.IndexOf(members,"Kai")+1
      
      
      
      
       
       1.

      
      
       
       len=members.Length
      
      
      
      
       
       1.

      
      
       
       x=members(2-1)
       
       
end Code
      
      
      
      
       
       1.
       
       2.

      
      
       
       <h3>Members</h3>
      
      
      
      
       
       1.

      
      
       
       @For Each person In members  
       
       
@<p>@person</p>
       
       
Next person
      
      
      
      
       
       1.
       
       2.
       
       3.

      
      
       
       <p>The number of names 
       
       
in Members are @len</p>
      
      
      
      
       
       1.
       
       2.

      
      
       
       <p>The person at 
       
       
position 2 is @x</p>
      
      
      
      
       
       1.
       
       2.

      
      
       
       <p>Kai is now in 
       
       
position @i</p>
      
      
      
      
       
       1.
       
       2.

This paper addresses ： https://www.linuxprobe.com/asp-net-razor.html

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