C#-给定一个类的实例，如何访问该类的静态成员? [英] C# -- how does one access a class' static member, given an instance of that class?

问题描述

在C#中，假设您有一个作为类MyClass的实例的对象(例如myObject). 仅使用myObject，您将如何访问MyClass的静态成员?

In C#, suppose you have an object (say, myObject) that is an instance of class MyClass. Using myObject only, how would you access a static member of MyClass?

class MyClass
    {
    public static int i = 123 ;
    }

class MainClass
    {
    public static void Main()
        {
        MyClass myObject = new MyClass() ;
        myObject.GetType().i = 456 ; //  something like this is desired,
                         //  but erroneous
        }
    }

推荐答案

您将不得不使用反射:

Type type = myObject.GetType();
FieldInfo field = type.GetField("i", BindingFlags.Public |
                                     BindingFlags.Static);
int value = (int) field.GetValue(null);

尽管如此，我通常会尽量避免这样做……这非常脆弱.这是使用常规继承的替代方法:

I'd generally try to avoid doing this though... it's very brittle. Here's an alternative using normal inheritance:

public class MyClass
{
    public virtual int Value { get { return 10; } }
}

public class MyOtherClass : MyClass
{
    public override int Value { get { return 20; } }
}

等

然后，您只需使用myObject.Value即可获取正确的值.

Then you can just use myObject.Value to get the right value.

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