这个是父类
public class CycleAry
{
protected string[] Items;
protected int end;
public int Totlen;
public int length;
public CycleAry(int Len)
{
Items = new string[Len];
this.end = this.Totlen;
this.Totlen = Len;
this.length = 0;
}
}
子类中:
public class MenuAry : MyCls.CycleAry
{
public MenuAry(int index)
{
base(index);
}
}
出错提示:
E:\exercises\C#\ConsoleApplication\MenuAry.cs(10): 重载“CycleAry”方法未获取“0”参数E:\exercises\C#\ConsoleApplication\MenuAry.cs(12): 在此上下文中使用关键字 base 是无效的请问怎样才能做到java里面super(index)那种效果啊?
public class CycleAry
{
protected string[] Items;
protected int end;
public int Totlen;
public int length;
public CycleAry(int Len)
{
Items = new string[Len];
this.end = this.Totlen;
this.Totlen = Len;
this.length = 0;
}
}
子类中:
public class MenuAry : MyCls.CycleAry
{
public MenuAry(int index)
{
base(index);
}
}
出错提示:
E:\exercises\C#\ConsoleApplication\MenuAry.cs(10): 重载“CycleAry”方法未获取“0”参数E:\exercises\C#\ConsoleApplication\MenuAry.cs(12): 在此上下文中使用关键字 base 是无效的请问怎样才能做到java里面super(index)那种效果啊?
public class MenuAry : MyCls.CycleAry
{
public MenuAry(int index)
{
base(index);//C#不是这样用的
}
}
试试看这个public class MenuAry : MyCls.CycleAry
{
public MenuAry(int index):base(index)
{
}
}
嘿嘿~~~~~~~~~~~~~~~~~~~~~~~
base 关键字用于从派生类中访问基类的成员: 调用基类上已被其他方法重写的方法。
指定创建派生类实例时应调用的基类构造函数。
基类访问只能在构造函数、实例方法或实例属性访问器中进行。从静态方法中使用 base 关键字是错误的。示例
在本例中,基类 Person 和派生类 Employee 都有一个名为 Getinfo 的方法。通过使用 base 关键字,可以从派生类中调用基类上的 Getinfo 方法。// keywords_base.cs
// Accessing base class members
using System;
public class Person
{
protected string ssn = "444-55-6666";
protected string name = "John L. Malgraine";public virtual void GetInfo()
{
Console.WriteLine("Name: {0}", name);
Console.WriteLine("SSN: {0}", ssn);
}
}
class Employee: Person
{
public string id = "ABC567EFG";public override void GetInfo()
{
// Calling the base class GetInfo method:
base.GetInfo();
Console.WriteLine("Employee ID: {0}", id);
}
}class TestClass {
public static void Main()
{
Employee E = new Employee();
E.GetInfo();
}
}
输出
Name: John L. Malgraine
SSN: 444-55-6666
Employee ID: ABC567EFG
有关其他示例,请参见 new、virtual 和 override。示例
本示例显示如何指定在创建派生类实例时调用的基类构造函数。// keywords_base2.cs
using System;
public class MyBase
{
int num;public MyBase()
{
Console.WriteLine("in MyBase()");
}public MyBase(int i )
{
num = i;
Console.WriteLine("in MyBase(int i)");
}public int GetNum()
{
return num;
}
}public class MyDerived: MyBase
{
// This constructor will call MyBase.MyBase()
public MyDerived() : base()
{
}// This constructor will call MyBase.MyBase(int i)
public MyDerived(int i) : base(i)
{
}public static void Main()
{
MyDerived md = new MyDerived();
MyDerived md1 = new MyDerived(1);
}
}
输出
in MyBase()
in MyBase(int i)
{
public MenuAry(int index):base(index) {
}
}