Prior to C# 10.0 a struct could only have constructors that took parameters. Any initialization had to use a static method or a factory method.

Code

Now

public struct Container
{
    public Container()
    {
        CreatedAt = DateTime.Now;
    }

    public string Name { get; set; }
    public DateTime CreatedAt { get; set; }
}

Before

public struct Container
{
    public Container(string name)
    {
        Name = name;
        CreatedAt = DateTime.Now;
    }

    public string Name { get; set; }
    public DateTime CreatedAt { get; set; }
}

Notes

• default(T) and new T() in generic contexts still use zero-initialization and do not call the parameterless constructor
• Field initializers on structs are also permitted as part of this feature

More information

• Specification