The short => syntax for defining methods and read-only properties was introduced in Expression bodied members ^{C# 6.0}.

C# 7.0 expands this support to constructors, finalizers, get accessors, and set accessors.

Code

Now

class NamedHandle
{
    string name;
    ulong handle = Handle.Allocate();

    public NamedHandle(string name) => this.name = name;

    ~NamedHandle() => Handle.Release(handle);

    public string Name
    {
        get => name;
        set => name = value;
    }
}

Before

class NamedHandle
{
    string name;
    ulong handle = Handle.Allocate();

    public NamedHandle(string name)
    {
        this.name = name;
    }

    ~NamedHandle()
    {
        Handle.Release(handle);
    }

    public string Name
    {
        get { return name; }
        set { name = value; }
    }
}

Notes

• Accessor bodies also work for indexers and for event add/remove accessors
• Constructors, finalizers and set accessors must use an expression that is valid as a statement, such as an assignment or method call

More information

• What's new in C# 7.0
• Expression body definition (C# reference)