is Pattern

An is expression that tests a value against a type or another pattern.

What is is Pattern in C#?

is Pattern — An is expression that tests a value against a type or another pattern.

class LabelReader
{
    int LengthOf(object value)
    {
        if (value is string text)
        {
            return text.Length;
        }

        return 0;
    }
}

Level: Journeyman · More C# terms at this level

Updated September 27, 2026