C# 如何引用对象中的属性以每次重新评估它们

我尝试使用字典将一些

enum

映射到一些

bool

属性：

private Dictionary<FooEnum, bool> isBarByFoo;

private Dictionary<FooEnum, bool> IsBarByFoo
{
    get
    {
        return isBarByFoo ?? (isBarByFoo = new Dictionary<FooEnum, bool>
        {
            { FooEnum.Foo1, IsBar1 },
            { FooEnum.Foo2, IsBar2 },
            { FooEnum.Foo3, IsBar3 }
        });
    }
}

private bool IsBar1 => SomeConditionsThatChangeOverRuntime1();
private bool IsBar2 => SomeConditionsThatChangeOverRuntime2();
private bool IsBar3 => SomeConditionsThatChangeOverRuntime3();

私人字典isBarByFoo；
私人字典IsBarByFoo
{
得到
{
返回isBarByFoo？？？（isBarByFoo=新字典
{
{fooneum.Foo1，IsBar1}，
{fooneum.Foo2，IsBar2}，
{fooneum.Foo3，IsBar3}
});
}
}
private bool IsBar1=>SomeConditionSthatChangeOverflowTime1（）；
private bool IsBar2=>SomeConditionsThatChangeOverflowTime2（）；
private bool IsBar3=>SomeConditionsThatChangeOverflowTime3（）；

但是，这种方法不起作用，因为在创建字典并将其保存为值类型时，只需对属性进行一次计算，结果证明我误解了属性的工作方式

是否可以在字典中存储属性，每次查找时都对其进行评估，或者您可以为此类问题提出不同的解决方案？

如何：

    private Dictionary<FooEnum, Func<bool>> isBarByFoo;

    private Dictionary<FooEnum, Func<bool>> IsBarByFoo
    {
        get
        {
            return isBarByFoo ?? (isBarByFoo = new Dictionary<FooEnum, Func<bool>>
            {
                { FooEnum.Foo1, SomeConditionsThatChangeOverRuntime1},
                { FooEnum.Foo2, SomeConditionsThatChangeOverRuntime2},
                { FooEnum.Foo3, SomeConditionsThatChangeOverRuntime3}
            });
        }
    }

    private bool SomeConditionsThatChangeOverRuntime1() => true;
    private bool SomeConditionsThatChangeOverRuntime2() => false;
    private bool SomeConditionsThatChangeOverRuntime3() => true;

私人字典isBarByFoo；
私人字典IsBarByFoo
{
得到
{
返回isBarByFoo？？？（isBarByFoo=新字典
{
{FooEnum.Foo1，someConditionsThatChangeOverflowTime1}，
{FooEnum.Foo2，someConditionsThatChangeOverflowTime2}，
{FooEnum.Foo3，someConditionsThatChangeOverflowTime3}
});
}
}
private bool someconditionsthatchchangesoverflowtime1（）=>true；
private bool someconditionsthatchchangeOverflowTime2（）=>false；
private bool someconditions thatChangeOverflowTime3（）=>true；

当您通过IsBarByFoo[FooEnum.Foo1]（）获取字典值时，您将获得所需的值

那么：

    private Dictionary<FooEnum, Func<bool>> isBarByFoo;

    private Dictionary<FooEnum, Func<bool>> IsBarByFoo
    {
        get
        {
            return isBarByFoo ?? (isBarByFoo = new Dictionary<FooEnum, Func<bool>>
            {
                { FooEnum.Foo1, SomeConditionsThatChangeOverRuntime1},
                { FooEnum.Foo2, SomeConditionsThatChangeOverRuntime2},
                { FooEnum.Foo3, SomeConditionsThatChangeOverRuntime3}
            });
        }
    }

    private bool SomeConditionsThatChangeOverRuntime1() => true;
    private bool SomeConditionsThatChangeOverRuntime2() => false;
    private bool SomeConditionsThatChangeOverRuntime3() => true;

私人字典isBarByFoo；
私人字典IsBarByFoo
{
得到
{
返回isBarByFoo？？？（isBarByFoo=新字典
{
{FooEnum.Foo1，someConditionsThatChangeOverflowTime1}，
{FooEnum.Foo2，someConditionsThatChangeOverflowTime2}，
{FooEnum.Foo3，someConditionsThatChangeOverflowTime3}
});
}
}
private bool someconditionsthatchchangesoverflowtime1（）=>true；
private bool someconditionsthatchchangeOverflowTime2（）=>false；
private bool someconditions thatChangeOverflowTime3（）=>true；

---

当您通过IsBarByFoo[FooEnum.Foo1]（）获取字典值时，您将获得所需的值

另一种解决方案可能是忘记字典，只需使用一种方法来获取值：

private bool GetIsBarByFoo(FooEnum foo)
{
    switch (foo)
    {
        case FooEnum.Foo1:
           return SomeConditionsThatChangeOverRuntime1();
        case FooEnum.Foo2:
           return SomeConditionsThatChangeOverRuntime2();
        case FooEnum.Foo3:
           return SomeConditionsThatChangeOverRuntime3();
        default:
           return false;
    }
}

---

另一种解决方案可能是忘记字典，只使用一种方法来获取值：

private bool GetIsBarByFoo(FooEnum foo)
{
    switch (foo)
    {
        case FooEnum.Foo1:
           return SomeConditionsThatChangeOverRuntime1();
        case FooEnum.Foo2:
           return SomeConditionsThatChangeOverRuntime2();
        case FooEnum.Foo3:
           return SomeConditionsThatChangeOverRuntime3();
        default:
           return false;
    }
}

---

为什么不每次都返回一个新字典呢？为什么不每次都返回一个新字典呢？为什么不每次都返回一个新字典呢？这些属性比我在示例中使用的一行程序更复杂，并且在某些时候可能有setter，所以我不能用methodsWell替换它们，这是您要求的；）@你说的一行是什么意思？私有方法？属性比我在示例中使用的一行程序更复杂，并且可能在某个点上有setter-因此我不能用methodsWell替换它们，这是您要求的；）@你说的一行是什么意思？私人方法？