about use Lambda expression in Property

Question

Here's using Lambda in Property,

      public int MyProperty

        {

            get =>  myVar; 

            set => myVar = value; 

        }

but if I want multiple statements in seter or getter, hot to do that？or in this case only can use normal getter or setter?

        public int MyProperty
        {
            get => {return myVar ; OnPropertyChanged("MyProperty");} // this is worong , 
            set => myVar = value; 
        }

Answer 1

While it uses the arrow syntax, you are not defining a lambda which is a type of closure, and a closure makes no sense as a property definition ( there is context to capture).

As property definitions already support multi line definitions, the arrow syntax was added to support the common case of a single expression.

Answer 2

If you want to include multiple statements in a property getter or setter, you cannot use the simple arrow notation that is commonly used with Lambda expressions. Instead, you need to use a block of code enclosed in curly braces.

e.g.

public int MyProperty
{
    get
    {
        int result = 0;
        for (int i = 0; i < 10; i++)
        {
            result += i;
        }
        return result;
    }
    set => myVar = value;
}

// or

public int MyProperty
{
    get => myVar;
    set
    {
        if (value < 0)
        {
            throw new ArgumentException("Value must be non-negative");
        }
        myVar = value;
    }
}