C#new语句后的花括号有什么作用? [英] What do braces after C# new statement do?

问题描述

给出下面的代码，position0的初始化方式和position1的初始化方式有什么区别?它们相等吗?如果没有，有什么区别?

Given the code below, what is the difference between the way position0 is initialized and the way position1 is initialized? Are they equivalent? If not, what is the difference?

class Program
{
    static void Main(string[] args)
    {
        Position position0 = new Position() { x=3, y=4 };

        Position position1 = new Position();
        position1.x = 3;
        position1.y = 4;
    }
}

struct Position
{
    public int x, y;
}

推荐答案

对象和集合初始化程序，用于初始化对象上的字段.

Object and collection initializers, used to initialize fields on an object.

http://msdn.microsoft.com/en-us/library/bb384062.aspx

它们产生接近的等效IL.乔恩·斯凯特(Jon Skeet)给出了真实情况的答案.

They produce nearly equivalent IL. Jon Skeet has the answer on what is really going on.

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