Razor C# loops
ASP.NET Razor - C# Loops and Arrays
Statements will be executed repeatedly in the loop.
For Loop
If you need to execute the same statement repeatedly, you can set a loop.
If you know the number of times you want to loop, you can use for loop. This type of loop is especially useful when counting up or down:
Instance
<html>
<body>
@for(var i = 10; i < 21; i++)
{
<p>Line @i</p>
}
</body>
</html>Running Example»
Click the "Run Example" button to view the online example
For Each Loop
If you are using a collection or array, you will often usefor each cycle.
A collection is a group of similar objects, and the for each loop can traverse the collection until completion.
In the following example, the ASP.NET Request.ServerVariables collection is traversed.
Instance
<html>
<body>
<ul>
@foreach (var x in Request.ServerVariables)
{<li>@x</li>}
</ul>
</body>
</html>Run Instance»
Click the "Run Instance" button to view the online instance
While loop
while loop is a general loop.
The while loop starts with the while keyword, followed by parentheses where you specify how long the loop will last, and then the block of code to be executed repeatedly.
The while loop usually sets an incrementing or decrementing variable for counting.
In the following example, the += operator adds 1 to the value of variable i each time the loop is executed.
Instance
<html>
<body>
@{
var i = 0;
while (i < 5)
{
i += 1;
<p>Line @i</p>
}
}
</body>
</html>Run Instance»
Click the "Run Instance" button to view the online instance
Array
When you want to store multiple similar variables but don’t want to create a separate variable for each variable, you can use an array to store:
Instance
@{
string[] members = {"Jani", "Hege", "Kai", "Jim"};
int i = Array.IndexOf(members, "Kai")+1;
int len = members.Length;
string x = members[2-1];
}
<html>
<body>
<h3>Members</h3>
@foreach (var person in members)
{
<p>@person</p>
}
<p>The number of names in Members are @len</p>
<p>The person at position 2 is @x</p>
<p>Kai is now in position @i</p>
</body>
</html>Run instance»
Click the "Run instance" button to view the online instance
