c# - 如何在 C# 中创建子类？

Question

如何使用 Visual Studio 2010 在 C# 中为 ASP.NET 创建子类？

Answer 1

你是这个意思吗？

public class Foo
{}

public class Bar : Foo
{}

在这种情况下，Bar 是子类。

Answer 2

这是一个编写 ParentClass 然后创建 ChildClass 作为子类的示例。

using System;

public class ParentClass
{
    public ParentClass()
    {
        Console.WriteLine("Parent Constructor.");
    }

    public void print()
    {
        Console.WriteLine("I'm a Parent Class.");
    }
}

public class ChildClass : ParentClass
{
    public ChildClass()
    {
        Console.WriteLine("Child Constructor.");
    }

    public static void Main()
    {
        ChildClass child = new ChildClass();

        child.print();
    }
}

输出：

父构造函数。
子构造函数。
我是家长班。

我没有重写 .Net 继承的另一个示例，而是从C Sharp Station 网站复制了一个不错的示例。

Answer 3

你的意思是类继承？

public class SubClass: MasterClass
{
}

Answer 4

这个页面解释得很好：

public class SavingsAccount : BankAccount
{
    public double interestRate;

    public SavingsAccount(string name, int number, int balance, double rate) : base(name, number)
    {
        accountBalance = balance;
        interestRate = rate;
    }

    public double monthlyInterest()
    {
        return interestRate * accountBalance;
    }
}

static void Main()
{
    SavingsAccount saveAccount = new SavingsAccount("Fred Wilson", 123456, 432, 0.02F);

    Console.WriteLine("Interest this Month = " + saveAccount.monthlyInterest());
}

If the monthlyInterest method already exists in the BankAccount class (and is declared abstract, virtual, or override) then the SavingsAccount method definition should include override, as explained here. Not using override to redefine such class methods will result in a CS0108 compiler warning, which can be suppressed by using new as confusingly stated here.