Prior to C# 11 struct constructors were required to explicitly assign every field and auto-property. This was tedious when only some fields needed non-default values and the rest could remain at their defaults.

C# 11 removes this requirement by having the compiler automatically initialize any fields not explicitly assigned by the constructor to their default values.

Code

Now

struct Point
{
    public int X { get; set; }
    public int Y { get; set; }
    public bool IsValid { get; set; }

    public Point(int x, int y)
    {
        X = x;
        Y = y;
        // IsValid is automatically initialized to default (false)
    }
}

Before

struct Point
{
    public int X { get; set; }
    public int Y { get; set; }
    public bool IsValid { get; set; }

    public Point(int x, int y)
    {
        X = x;
        Y = y;
        IsValid = default; // Required or the compiler would error
    }
}

More information

• What's New in C# 11