C#模仿覆盖赋值运算符(=)

public class MyClass
{
    private int _value;

    public MyClass(int value)
    {
        _value = value;
    }

    public static MyClass operator +(MyClass obj1, MyClass obj2)
    {
        return new MyClass(obj1._value + obj2._value);
    }

    public static MyClass operator +=(MyClass obj1, MyClass obj2)
    {
        obj1._value += obj2._value;
        return obj1;
    }
}