C＃ - 常量属性相当于lambda表达式？

Question

I picked up C# again, came back after a long work in Java, and as you may expect, I got very interested in properties(oh the Java burden), therefore I started to explore them a bit and came up with this.

private static float Width {
    get { return 0.012f; }
}

After a bit of tinkering, I realized this works too(lambda expression?).

private static float Width => 0.012f;

Now please help a fellow Java developer here to understand what is exactly the difference? What the former can do that the latter cannot and vice versa.

Answer 1

what is exactly the difference?

Both ways define a getter only property. The latter simply uses C# 6's new feature called "Expression Bodied Members" , specifically these are "Expression Bodied Properties", which allow you to use the fat arrow syntax and are merely syntax sugar.

If you look at what the compiler generates , you'll see:

private static float Width
{
    get
    {
        return 0.012f;
    }
}

Which is identical to your getter only declaration.

These can also be applied to one-liner methods as well:

public int Multiply(int x) => x * x;

Answer 2

There are equal.

private static float Width => 0.012f;

The Width is a getter only property just like your first example;
The difference is merely only syntactic sugar.

ref: https://github.com/dotnet/roslyn/wiki/Languages-features-in-C%23-6-and-VB-14

Answer 3

This is a simplification of the language under C# 6.0 and are called 'Expression Bodied Functions / Properties'.

The idea is to simplify the syntax and allow you to set values for functions and properties in a shorter format.

Visual Studio magazine has an article on it here: https://visualstudiomagazine.com/articles/2015/06/03/c-sharp-6-expression-bodied-properties-dictionary-initializer.aspx