Variables

Just like in regular C# code, you can define variables in Razor, to store information for later use. If you are already inside a code-scope, e.g. inside an if-statement or another control structure, you can just define it straight away. If you're inside of a markup-scope, you can use a Razor code-block, as described in a previous article, to define your variable inside. Here's an example:

@{ 
    string helloWorldMsg = "Hello, world!";
}

You can of course output it just as easily, either directly in the code block or outside of it, by referencing the name. Here's an example of it:

@{ 
    string helloWorldMsg = "Hello, world!";
}

<div>
    @helloWorldMsg
</div>

You can of course work with and manipulate your variables and apply logic to them, just like you would in C#:

@{ 
    string helloWorldMsg = "Good day";
    if(DateTime.Now.Hour > 17)
    {
    helloWorldMsg = "Good evening";
    }
    helloWorldMsg += ", world!";
    helloWorldMsg = helloWorldMsg.ToUpper();
}

<div>
    @helloWorldMsg
</div>

Summary

Declaring and using variables in Razor is just as easy as using them in your regular C# code. As you will see in later examples, it can be really powerful to have easy-access to variables in your markup.