控制檯應用程序異常

Question

在我們的高級的需求，我們被要求創建用戶在其中輸入，並得到他/她的儲蓄信息細節的應用...

其工作完全正常， 除了事實當我按Enter鍵時，我得到一個異常和我的程序崩潰..

請提供我的信息，以便在我的控制檯應用程序，即使我按Enter鍵，我沒有得到異常，而是，它返回的程序。

非常感謝， 非常感謝。

這是我的程序。

using System; 

using System.Collections.Generic; 

using System.Text; 



namespace bankprob { 



    class sav_acc 

    { 

     public float amount; 

     public sav_acc(float amount) 
     { 

      this.amount = amount; 

     } 

     public void getdeposit(float depos) 
     { 

      amount += depos; 

     } 

     public void display() 
     { 

      Console.WriteLine("Balance of Customer :{0} ", amount); 

     } 


     public void withdrawl(float amt) 
     { 

      amount =amount - amt; 

     } 

     public void minbal() 
     { 

      if (amount < 1000) 
      { 

       Console.WriteLine("You cannot withdraw beyond the minimum balance of rupees 1000. "); 
       return; 
      } 

     } 

    } 

    class cur_acc 
    { 

     public float amount = 0; 

     public cur_acc(float amount) 


     { 

      this.amount = amount; 

     } 

     public void getdeposit(float depos) 
     { 

      amount += depos; 

     } 

     public void display() 
     { 

      Console.WriteLine("Balance of Customer : {0}", amount); 

     } 


     public void withdrawl(float amt) 
     { 

      amount = amount - amt; 

     } 

     public void minbal() 
     { 

      if (amount < 1000) 
      { 

       Console.WriteLine(" Your balance is less than 1000, and u cannot make any withdrawals"); 

      } 

      else 

       Console.WriteLine("Balance is greater than Rs 1000 no need to panality"); 

     } 

    } 

    class Program 
    { 

     public static void Main(string[] args) 
     { 
      Console.WriteLine("Welcome Mr.Sayeed"); 
      Console.WriteLine("Please select the type of account.\n1.Savings 2.Current 3.Exit"); 

      int ch; 
      ch = int.Parse(Console.ReadLine()); 
      switch (ch) 
      { 

       case 1: 

        Console.WriteLine("Enter Initail Amount : "); 

        float amt = int.Parse(Console.ReadLine()); 

        sav_acc s = new sav_acc(amt); 

        Console.WriteLine("Enter deposit money : "); 

        float depos = float.Parse(Console.ReadLine()); 

        s.getdeposit(depos); 

        s.display(); 

        Console.WriteLine("Enter withdrawl Amount"); 

        float wamt = float.Parse(Console.ReadLine()); 

        s.withdrawl(wamt); 

        s.display(); 

        s.minbal(); 

        s.display(); 

        break; 

       case 2: 

        Console.WriteLine("Enter Initail Amount : "); 

        float am = int.Parse(Console.ReadLine()); 

        cur_acc c = new cur_acc(am); 

        Console.WriteLine("Enter deposit money : "); 

        float depo = float.Parse(Console.ReadLine()); 

        c.getdeposit(depo); 

        c.display(); 


        Console.WriteLine("Enter withdrawl Amount"); 

        float wam = float.Parse(Console.ReadLine()); 

        c.withdrawl(wam); 

        c.display(); 

        c.minbal(); 

        c.display(); 

        break; 
       case 3: 
        Console.WriteLine("Thank you for Using this applicaton"); 
        return; 

       default: 
        Console.WriteLine("You have made a wrong choice, Thank you..."); 
        return; 

      } 

     } 

    } 

} 

Answer 1

int.Parse(Console.ReadLine())要求您輸入一個有效的整數。如果您只是按下return而不輸入值，則該方法會拋出異常。改爲使用int.TryParse。

int ch = 0; 
int.TryParse(Console.ReadLine(), ch); 
switch (ch) { 
    ... 
}