c# 为什么我们不能覆盖静态属性？ （高级类如何调用具有高级数据的基类方法）

Question

我的问题可能措辞不好，可能是骗人的，但我走了

class person {
    protected static string request = "select * from person where gender in ('male','female')";
    public string sharedmethod()
    {
        return "the request is" + request;
    }
}

class man:person
{
    override protected static string request = "select person.*,man.* from person,men where mytype in ('male') ";
    DateTime dateOfFirstCar;
}

class woman:person
{
    override protected static string request = "select person.*,woman.* from person,women where mytype in ('female') ";
    DateTime dateOfFirstITBAG;
}

class Program
{
    static void Main(string[] args)
    {
        if (new person().sharedmethod() == new man().sharedmethod())
            Console.Write("too bad query is the same in base and dervide class");
    }
}

一个人就是一个人
女人就是人
Person,man,woman 存在于我的数据库中，但需要不同的查询

我不想重复这些查询，所以我认为将它们存储在每个类的静态属性中是个好主意。

我在基类中得到了一些低级的东西（没有计算出来）（因为我不想复制），我希望继承的类在继承类的上下文中调用基类方法

我希望 man.[inherited]somemethod() 执行 person.somemethod() 但变量来自 man

谢谢你

Answer 1

添加一个覆盖静态字符串的非静态属性，并改为引用该属性：

class person {
    private const string request = "select * from person where gender in ('male','female')";
    protected virtual string Request {get {return request;}}
    public string sharedmethod() {
        return "the request is" + Request;
    }
}

class man:person {
    private const string request = "select person.*,man.* from person,men where mytype in ('male') ";
    protected override string Request {get {return request;}}
    DateTime dateOfFirstCar;
}

class woman:person {
    private const string request = "select person.*,woman.* from person,women where mytype in ('female') ";
    protected override string Request {get {return request;}}
    DateTime dateOfFirstITBAG;
}