foreach循環

Question

我有兩個問題

1）我的界面我有接口稱爲IRegister，在它內部我有另一個接口稱爲IPerson，這是正確的做法？

2）我有兩個列表（IRegister，IPerson）都可以有一個或多個行。

循環兩個List的最佳方式是什麼？在GetValidationRules中？

public interface IRegister 
{ 
    string FirstName { get; } 
    string MiddleName { get; } 
    string LastName { get; } 
    string EmailAddress { get; }   
    List<IPerson> Student { get; } 
} 


public static List<ValidationRule> GetValidationRules(List<IRegister> register) 
    { 
     List<ValidationRule> validationRules = new List<ValidationRule>(); 



     foreach (IRegister myregister in register) 
     { 
      if (string.IsNullOrEmpty(myregister.FirstName)) 
       validationRules.Add(new ValidationRule("Reg", "Must have aFirst Name")); 
      if (string.IsNullOrEmpty(myregister.LastName)) 
       validationRules.Add(new ValidationRule("Reg", "Must have a Last Name")); 
      if (string.IsNullOrEmpty(myregister.EmailAddress)) 
       validationRules.Add(new ValidationRule("Reg", "Must have a Email Address")); 

    IPerson here? how 
     } 

Answer 1

雖然我不是100％肯定，你要完成基於你的問題......我猜測你想知道如何通過循環內的Student屬性格式IRegister的迭代什麼...

public interface IRegister 
{ 
    string FirstName { get; } 
    string MiddleName { get; } 
    string LastName { get; } 
    string EmailAddress { get; }   
    List<IPerson> Student { get; } 
} 

public static List<ValidationRule> GetValidationRules(List<IRegister> register) 
{ 
    List<ValidationRule> validationRules = new List<ValidationRule>(); 



    foreach (IRegister myregister in register) 
    { 
     if (string.IsNullOrEmpty(myregister.FirstName)) 
      validationRules.Add(new ValidationRule("Reg", "Must have aFirst Name")); 
     if (string.IsNullOrEmpty(myregister.LastName)) 
      validationRules.Add(new ValidationRule("Reg", "Must have a Last Name")); 
     if (string.IsNullOrEmpty(myregister.EmailAddress)) 
      validationRules.Add(new ValidationRule("Reg", "Must have a Email Address")); 

     foreach (IPerson person in myregister.Student) 
     { 
      // Not sure what properties you want to check for because 
      // you didn't show us what the IStudent interface looks like 
      // so I will just assume that the IStudent object has a 
      // property for EmailAddress as well 

      if (string.IsNullOrEmpty(person.EmailAddress)) 
       validationRules.Add(new ValidationRule("Reg", "Student must have a Email Address")); 
     } 
    } 
} 

Answer 2

遍歷所有IPerson實例的最簡單的方法是使用的SelectMany拼合IRegister情境中的IPerson列表。例如

foreach (var person in register.SelectMany(x => x.Student)) { 
    ... 
} 

這具有創建IEnumerable<IPerson>它包含來自所有IRegister值的所有實例IPerson的效果。

Answer 3

恩，嵌套循環在你的標記。

foreach (IPerson peep in myregister.Student) { ... }