Records and Modern Types

Target-Typed New

Target-typed new lets C# infer the constructed type from the variable type.

Target-Typed New

TargetTypedNew.cs 
using System;

record Counter(int Start)
{
    public int Next()
    {
        return Start + 1;
    }

    public override string ToString()
    {
        return Start.ToString();
    }
}

class Program
{
    static void Main()
    {
        int start = ;
        Counter counter = new(start);
        int next = counter.Next();

        Console.WriteLine($"start={start}");
        Console.WriteLine($"next={next}");
    }
}

using System;

record Counter(int Start)
{
    public int Next()
    {
        return Start + 1;
    }

    public override string ToString()
    {
        return Start.ToString();
    }
}

class Program
{
    static void Main()
    {
        int start = ;
        Counter counter = new(start);
        int next = counter.Next();

        Console.WriteLine($"start={start}");
        Console.WriteLine($"next={next}");
    }
}

using System;

record Counter(int Start)
{
    public int Next()
    {
        return Start + 1;
    }

    public override string ToString()
    {
        return Start.ToString();
    }
}

class Program
{
    static void Main()
    {
        int start = ;
        Counter counter = new(start);
        int next = counter.Next();

        Console.WriteLine($"start={start}");
        Console.WriteLine($"next={next}");
    }
}
target-typed new Target-typed `new` omits the type name when the target type is clear.