C＃：似乎無法將我的頭圍繞編譯錯誤

Question

我面臨「公共靜態無效PromoteEmployee（列表employeeList，IsPromotable IsEligibleToPromote）」中的「PromoteEmployee」編譯問題。

如果有人能給我一個關於如何去做這件事的提示，我將不勝感激。

編輯：

錯誤是： 「可訪問性不一致：參數類型 'Program.IsPromotable' 比方法更少可訪問的 'Program.Employee.PromoteEmployee（列表，Program.IsPromotable）'

class Program 
{ 
    static void Main(string[] args) 
    { 
     List<Employee> empList = new List<Employee>(); 

     empList.Add(new Employee() 
     { 
      ID = 101, 
      Name = "Test1", 
      Salary = 5000, 
      Experience = 5 
     }); 

     empList.Add(new Employee() 
     { 
      ID = 101, 
      Name = "Test2", 
      Salary = 2000, 
      Experience = 1 
     }); 

     empList.Add(new Employee() 
     { 
      ID = 101, 
      Name = "Test3", 
      Salary = 4000, 
      Experience = 4 
     }); 

     IsPromotable isPromotable = new IsPromotable(Promote); 

     Employee.PromoteEmployee(empList, isPromotable); 
    } 

    public static bool Promote(Employee emp) 
    { 
     if (emp.Experience >= 5) 
     { 
      return true; 
     } 
     else 
     { 
      return false; 
     } 
    } 

    delegate bool IsPromotable(Employee empl); 

    public class Employee 
    { 
     public int ID { get; set; } 
     public string Name { get; set; } 
     public int Salary { get; set; } 
     public int Experience { get; set; } 

     public static void PromoteEmployee(List<Employee> employeeList, IsPromotable IsEligibleToPromote) 
     { 
      foreach (Employee employee in employeeList) 
      { 

       if (IsEligibleToPromote(employee)) 
       { 
        Console.WriteLine(employee.Name + " promoted"); 
       } 
      } 
     } 
    } 
} 

Answer 1

我得到編譯程序的錯誤是：發生

(67:28) Inconsistent accessibility: parameter type 'Program.IsPromotable' is less accessible than method 'Program.Employee.PromoteEmployee(System.Collections.Generic.List<Program.Employee>, Program.IsPromotable)' 

此錯誤的原因是PromoteEmployeepublic，但IsPromotable是私人的。

如果從外部類節目有人想打電話PromoteEmployee，他不能這樣做，因爲他不能創造的Program.IsPromotable一個實例，因爲它是私有的Program。

- https://stackoverflow.com/users/424129/ed-plunkett

要修復它使IsPromotableinternal或public讓別人以外Program可以創建它。

或者，您可以使PromoteEmployee私密。

Answer 2

這是一個工作dotnetfiddle。 https://dotnetfiddle.net/4iuQjt

using System; 
using System.Collections.Generic; 

public class Program 
{ 
    public static void Main(string[] args) 
    { 
     List<Employee> empList = new List<Employee>(); 

     empList.Add(new Employee() 
     { 
      ID = 101, 
      Name = "Test1", 
      Salary = 5000, 
      Experience = 5 
     }); 

     empList.Add(new Employee() 
     { 
      ID = 101, 
      Name = "Test2", 
      Salary = 2000, 
      Experience = 1 
     }); 

     empList.Add(new Employee() 
     { 
      ID = 101, 
      Name = "Test3", 
      Salary = 4000, 
      Experience = 4 
     }); 

     IsPromotable isPromotable = new IsPromotable(Promote); 

     Employee.PromoteEmployee(empList, isPromotable); 
    } 

    public static bool Promote(Employee emp) 
    { 
     if (emp.Experience >= 5) 
     { 
      return true; 
     } 
     else 
     { 
      return false; 
     } 
    } 

    public delegate bool IsPromotable(Employee empl); 

    public class Employee 
    { 
     public int ID { get; set; } 
     public string Name { get; set; } 
     public int Salary { get; set; } 
     public int Experience { get; set; } 

     public static void PromoteEmployee(List<Employee> employeeList, IsPromotable IsEligibleToPromote) 
     { 
      foreach (Employee employee in employeeList) 
      { 

       if (IsEligibleToPromote(employee)) 
       { 
        Console.WriteLine(employee.Name + " promoted"); 
       } 
      } 
     } 
    } 
}