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()
    {
        Name = "Untitled";
        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

• new Container() and new T() call the constructor, but default, default(T), array elements and unassigned fields are still zero-initialized and skip it
• Field initializers on structs are also permitted as part of this feature
• In C# 10 the constructor must still assign every field and auto-property; auto-default structs ^{C# 11.0} removed that requirement

More information

• Specification
• C# Reference