未處理的類型爲「System.FormatException」的異常輸入字符串格式不正確

Question

我目前正在學習C＃，並且試圖讓我的頭繞着類繼承，並且已經編寫了一些代碼來向控制檯顯示一行代碼，但是我遇到了此帖子主題中的錯誤。

它在string.format行中的子類PC中拋出錯誤。我假設它是與我傳遞的類型有關，但我迄今爲止嘗試過的所有內容都無法正常工作。任何意見都非常感謝，因爲我希望在進入下一個培訓階段之前確保充分理解這一點。

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Text; 
using System.Threading.Tasks; 

namespace ClassInheritance 
{ 
    class Program 
    { 
    static void Main(string[] args) 
    { 
     PC myPC = new PC(); 

     myPC.casetype = "Black SuperCool"; 
     myPC.contract = true; 
     myPC.dateadded = DateTime.Now; 
     myPC.id = 1; 
     myPC.type = "Small form factor"; 
     printEquipmentDetails(myPC); 

     Console.ReadLine(); 
    } 

    private static void printEquipmentDetails(Equipment Equipment) 
    { 
     Console.WriteLine("Details: {0}", Equipment.DisplayEquipment()); 
    } 
} 

abstract class Equipment 
{ 
    public int id { get; set; } 
    public string type { get; set; } 
    public bool contract { get; set; } 
    public DateTime dateadded { get; set; } 

    public abstract string DisplayEquipment(); 
} 

class PC : Equipment 
{ 
    public string casetype { get; set; } 

    public override string DisplayEquipment() 
    { 
     return String.Format("(0} - {1} - {2} - {3} - {4}", this.id, this.type, this.contract.ToString(), this.dateadded.ToShortDateString(), this.casetype); 
    } 
} 

class Laptop : Equipment 
{ 
    public string batterylife { get; set; } 

    public override string DisplayEquipment() 
    { 
     return String.Format("(0} - {1} - {2} - {3} - {4}", this.id, this.type, this.contract, this.dateadded, this.batterylife); 
    } 
} 
} 

Answer 1

在return String.Format("（0} - {1} - {2} - {3} - {4}"...線更換(與{。

所以
return String.Format("（0} - {1} - {2} - {3} - {4}"...
將
return String.Format("{0} - {1} - {2} - {3} - {4}"...