第一个使用新的-to-C＃-6 表达式主体成员语法。等效于：

The first uses the new-to-C#-6 expression-bodied member syntax. It's equivalent to:

public object MyObject
{
    get { return new object(); }
}

第二个也是C＃6的也是 -自动实现的只读属性。等效于：

The second is also new to C# 6 - an automatically implemented read-only property. It's equivalent to:

private readonly object _myObject; // Except using an unspeakable name
public object MyObject
{
    get { return _myObject; }
}

您只能分配给 MyObject 来自声明类中的构造函数，实际上只是分配给该字段。

You can only assign to MyObject from within a constructor in the declaring class, which actually just assigns to the field instead.

（这两个等价物都使用了老式的属性声明，您总是将 get ， set 设置为一个或两个都包含代码的块。）

(Both of these "equivalencies" are using old-school property declarations, where you always have get, set or both as blocks containing code.)