初学者急求：不会实现接口成员

Question

代码如下：
using System.Collections.Generic;
using System.Text;
using Wrox.ProCSharp;
using Wrox.ProCSharp.VenusBank;
using Wrox.ProCSharp.JupiterBank;namespace Wrox.ProCSharp
{
    public interface lBankAccount
    {
        void PayIn(decimal amount);
        bool WithDraw(decimal amount);
        decimal Balance
        {
            get;
        }
    }
}
namespace Wrox.ProCSharp.VenusBank
{
    public class SaverAccount : lBankAccount
    {
        private decimal banlance;         public void PayIn(decimal amount)
        {
            banlance += amount;
        }         public bool Withdraw(decimal amount)
        {
            if(banlance>=amount)
            {
                banlance -= amount ;
                return true;
            }            Console.WriteLine("withDraw attempt failed");
            return false;
        }
         
         public decimal Banlance
        {
            get
            {
                return banlance;
            }
        }        public override string  ToString()
        {
          return string.Format("Verus Bank Saver:Balance={0,6:C}",banlance);
        }
    }       
}
namespace Wrox.ProCSharp.JupiterBank
{
    public class GoldAccount : lBankAccount 
    {    }
}
namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            lBankAccount venusAccount = new SaverAccount();
            lBankAccount jupiterAccount = new GoldAccount();
            venusAccount.PayIn(200);
            venusAccount.WithDraw(100);
            Console.WriteLine(venusAccount.ToString());
            jupiterAccount.PayIn(500);
            jupiterAccount.WithDraw(600);
            jupiterAccount.WithDraw(100);
            Console.WriteLine(jupiterAccount.ToString());
        }
    }
}
出错：
错误 1 “Wrox.ProCSharp.VenusBank.SaverAccount”不会实现接口成员“Wrox.ProCSharp.lBankAccount.WithDraw(decimal)” d:\wody\Projects\form\ConsoleApplication1\ConsoleApplication1\Program.cs 24 18 ConsoleApplication1
错误 2 “Wrox.ProCSharp.VenusBank.SaverAccount”不会实现接口成员“Wrox.ProCSharp.lBankAccount.Balance” d:\wody\Projects\form\ConsoleApplication1\ConsoleApplication1\Program.cs 24 18 ConsoleApplication1
错误 3 “Wrox.ProCSharp.JupiterBank.GoldAccount”不会实现接口成员“Wrox.ProCSharp.lBankAccount.PayIn(decimal)” d:\wody\Projects\form\ConsoleApplication1\ConsoleApplication1\Program.cs 63 18 ConsoleApplication1
错误 4 “Wrox.ProCSharp.JupiterBank.GoldAccount”不会实现接口成员“Wrox.ProCSharp.lBankAccount.WithDraw(decimal)” d:\wody\Projects\form\ConsoleApplication1\ConsoleApplication1\Program.cs 63 18 ConsoleApplication1
错误 5 “Wrox.ProCSharp.JupiterBank.GoldAccount”不会实现接口成员“Wrox.ProCSharp.lBankAccount.Balance” d:\wody\Projects\form\ConsoleApplication1\ConsoleApplication1\Program.cs 63 18 ConsoleApplication1

Answer 1

using System.Collections.Generic; 
using System.Text; 
using Wrox.ProCSharp; 
using Wrox.ProCSharp.VenusBank; 
using Wrox.ProCSharp.JupiterBank; 这里不是全部引用了吗？我是初学者，可以说详细一点吗？

Answer 2

晕，你一个类文件里这么多引用
最好分开。
interface是一个文件，
实现类是一个文件。
using System.Collections.Generic; 
using System.Text; 
using Wrox.ProCSharp; 
using Wrox.ProCSharp.VenusBank; 
using Wrox.ProCSharp.JupiterBank; namespace Wrox.ProCSharp 
{ 
    public interface lBankAccount 
    { 
        void PayIn(decimal amount); 
        bool WithDraw(decimal amount); 
        decimal Balance 
        { 
            get; 
        } 
    } 
} using System.Collections.Generic; 
using System.Text; 
using Wrox.ProCSharp; 
using Wrox.ProCSharp.VenusBank; 
using Wrox.ProCSharp.JupiterBank; namespace ConsoleApplication1 
{ 
    class Program 
    { 
        static void Main(string[] args) 
        { 
            lBankAccount venusAccount = new SaverAccount(); 
            lBankAccount jupiterAccount = new GoldAccount(); 
            venusAccount.PayIn(200); 
            venusAccount.WithDraw(100); 
            Console.WriteLine(venusAccount.ToString()); 
            jupiterAccount.PayIn(500); 
            jupiterAccount.WithDraw(600); 
            jupiterAccount.WithDraw(100); 
            Console.WriteLine(jupiterAccount.ToString()); 
        } 
    } 
} 

Answer 3

我把所有的代码分成了四个文件
namespace Wrox.ProCSharp 
{ 
    public interface lBankAccount 
    { 
        void PayIn(decimal amount); 
        bool WithDraw(decimal amount); 
        decimal Balance 
        { 
            get; 
        } 
    } 
} 
这里一个文件namespace Wrox.ProCSharp.VenusBank 
{ 
    public class SaverAccount : lBankAccount 
    { 
        private decimal banlance;          public void PayIn(decimal amount) 
        { 
            banlance += amount; 
        }          public bool Withdraw(decimal amount) 
        { 
            if(banlance> =amount) 
            { 
                banlance -= amount ; 
                return true; 
            }             Console.WriteLine("withDraw attempt failed"); 
            return false; 
        } 
          
         public decimal Banlance 
        { 
            get 
            { 
                return banlance; 
            } 
        }         public override string  ToString() 
        { 
          return string.Format("Verus Bank Saver:Balance={0,6:C}",banlance); 
        } 
    }        
} 
这里一个文件
namespace Wrox.ProCSharp.JupiterBank 
{ 
    public class GoldAccount : lBankAccount  
    {     } 
} 
这里一个namespace ConsoleApplication1 
{ 
    class Program 
    { 
        static void Main(string[] args) 
        { 
            lBankAccount venusAccount = new SaverAccount(); 
            lBankAccount jupiterAccount = new GoldAccount(); 
            venusAccount.PayIn(200); 
            venusAccount.WithDraw(100); 
            Console.WriteLine(venusAccount.ToString()); 
            jupiterAccount.PayIn(500); 
            jupiterAccount.WithDraw(600); 
            jupiterAccount.WithDraw(100); 
            Console.WriteLine(jupiterAccount.ToString()); 
        } 
    } 
} 这里一个。
在文件的前面全部引用了命名空间。但问题依旧

Answer 4

using System.Collections.Generic; 
using System.Text; 
using Wrox.ProCSharp; 
using Wrox.ProCSharp.VenusBank; 
using Wrox.ProCSharp.JupiterBank; namespace Wrox.ProCSharp 
{ 
    public interface lBankAccount 
    { 
        void PayIn(decimal amount); 
        bool WithDraw(decimal amount); 
        decimal Balance 
        { 
            get; 
        } 
    } 
} 
namespace Wrox.ProCSharp.VenusBank 
{ 
    public class SaverAccount : lBankAccount 
    { 
        private decimal banlance;          public void PayIn(decimal amount) 
        { 
            banlance += amount; 
        }          public bool Withdraw(decimal amount) 
        { 
            if(banlance> =amount) 
            { 
                banlance -= amount ; 
                return true; 
            }             Console.WriteLine("withDraw attempt failed"); 
            return false; 
        } 
          
         public decimal Banlance 
        { 
            get 
            { 
                return banlance; 
            } 
        }         public override string  ToString() 
        { 
          return string.Format("Verus Bank Saver:Balance={0,6:C}",banlance); 
        } 
    }        
} 
namespace Wrox.ProCSharp.JupiterBank 
{ 
    public class GoldAccount : lBankAccount  
    { 
这里没有实现lBankAccount  接口
 private decimal banlance;          public void PayIn(decimal amount) 
        { 
            banlance += amount; 
        }          public bool Withdraw(decimal amount) 
        { 
            if(banlance> =amount) 
            { 
                banlance -= amount ; 
                return true; 
            }             Console.WriteLine("withDraw attempt failed"); 
            return false; 
        } 
          
         public decimal Banlance 
        { 
            get 
            { 
                return banlance; 
            } 
        }         public override string  ToString() 
        { 
          return string.Format("Verus Bank Saver:Balance={0,6:C}",banlance); 
        } 
    } 
} 
namespace ConsoleApplication1 
{ 
    class Program 
    { 
        static void Main(string[] args) 
        { 
            lBankAccount venusAccount = new SaverAccount(); 
            lBankAccount jupiterAccount = new GoldAccount(); 
            venusAccount.PayIn(200); 
            venusAccount.WithDraw(100); 
            Console.WriteLine(venusAccount.ToString()); 
            jupiterAccount.PayIn(500); 
            jupiterAccount.WithDraw(600); 
            jupiterAccount.WithDraw(100); 
            Console.WriteLine(jupiterAccount.ToString()); 
        } 
    } 
} 

Answer 5

这是个明显的低级错误!!!!!!!!!!!!!!!!!!!要求实现的那两个东西
bool WithDraw(decimal amount);  
decimal Balance
{
 get;
}一个是被你写成了Withdraw   (应该是WithDraw)
另一个是被你写成了Banlance (应该是Balance)还有
你根本就没有导入 System 命名空间,就写上了Console.WriteLine

Answer 6

真的好眼力,不说我还没注意到没引入System命名空间呢..

Answer 7

很明白啊
没有实现接口中的成员啊
是你的大小写
在接口中是大写
bool WithDraw(decimal amount); 
可是到了实现的类中就变成了小写了
public bool Withdraw(decimal amount) 

Answer 8

    public class SaverAccount : IBankAccount 
    { 
        void IBankAccount.PayIn(decimal amount)
        //必须写明是实现哪个接口的方法
        { 
            //省略
        }         bool IBankAccount.Withdraw(decimal amount) 
        { 
            //省略
        } 
          
        decimal IBankAccount.Banlance 
        { 
            //省略
        } 
    }