Force usage of “var” to be parsed as keyword rather than class name

user_1749408 0
Viewed 369

Is it possible to force C# compiler to treat var as a keyword and not as a class identifier when a class of name var is declared?

public class var
{
}

public class A
{
}

public class Program
{
    public static void Main()
    {
        var a=new A{};  // Cannot implicitly convert type 'A' to 'var'
    }
}

https://dotnetfiddle.net/O1wVoO

c#
3 Answers

In your code, you can no longer use var as a keyword within the context.

var is a contextual keyword (there are two types of keywords: normal and contextual), where it behaves like a keyword within its respective contexts where it is used as a type name, but can still be used as an identifier (not reserved).

You declared it as class name therefore it loses its special meaning within the context.

user_56595940

Can you declare var class name as @var and check. @forces keywords to behave like variables.

user_120130790

yes of course you can do that:

namespace vartest
{

    public class var {
        public var()
        {
            MessageBox.Show("It is me!");
        }
    }
}
namespace myform {
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            vartest.var theVar = new vartest.var();
            var a = "whatever";
        }
    }
}

As you can understand the trick is in the namespace ;-) Thus in your case to protect the c# var, define your var class at its own namespace which you should not be "using".

Cheers

user_136783950
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