用于属性的 getter 和 setter 的 Lambda

Question

In C# 6.0 I can write:

public int Prop => 777;

But I want to use getter and setter. Is there a way to do something kind of the next?

public int Prop {
   get => propVar;
   set => propVar = value;
}

Answer 1

First of all, that is not lambda, although syntax is similar.

It is called " expression-bodied members ". They are similar to lambdas, but still fundamentally different. Obviously they can't capture local variables like lambdas do. Also, unlike lambdas, they are accessible via their name:) You will probably understand this better if you try to pass an expression-bodied property as a delegate.

There is no such syntax for setters in C# 6.0, but C# 7.0 introduces it .

private int _x;
public int X
{
    get => _x;
    set => _x = value;
}

Answer 2

C# 7 brings support for setters, amongst other members:

More expression bodied members

Expression bodied methods, properties etc. are a big hit in C# 6.0, but we didn't allow them in all kinds of members. C# 7.0 adds accessors, constructors and finalizers to the list of things that can have expression bodies:

 class Person { private static ConcurrentDictionary<int, string> names = new ConcurrentDictionary<int, string>(); private int id = GetId(); public Person(string name) => names.TryAdd(id, name); // constructors ~Person() => names.TryRemove(id, out _); // finalizers public string Name { get => names[id]; // getters set => names[id] = value; // setters } }

Answer 3

There is no such syntax, but the older syntax is pretty similar:

    private int propVar;
    public int Prop 
    {
        get { return propVar; }
        set { propVar = value; }
    }

Or

public int Prop { get; set; }