調用這個和基礎構造函數？

Question

我有一個非常簡單和直接的問題。 調用一個類的另一個構造函數的標準方法或正確的方法是什麼，以及這樣的類的基類構造函數？ 我知道第二個例子不起作用。這只是第三種方式，這似乎很難。那麼，設計C＃的人希望用戶如何做到這一點？

例如：

public class Person 
{ 
    private int _id; 

    private string _name; 

    public Person() 
    { 
     _id = 0; 
    } 

    public Person(string name) 
    { 
     _name = name; 
    } 
} 

// Example 1 
public class Engineer : Person 
{ 
    private int _numOfProblems; 

    public Engineer() : base() 
    { 
     _numOfProblems = 0; 
    } 

    public Engineer(string name) : this(), base(name) 
    { 
    } 
} 

// Example 2 
public class Engineer : Person 
{ 
    private int _numOfProblems; 

    public Engineer() : base() 
    { 
     InitializeEngineer(); 
    } 

    public Engineer(string name) : base(name) 
    { 
     InitializeEngineer(); 
    } 

    private void InitializeEngineer() 
    { 
     _numOfProblems = 0; 
    } 
} 

Answer 1

你能不能簡化通過使用optional parameter你的做法？

public class Person 
    { 
     public int Id { get; protected set; } 
     public string Name { get; protected set; } 
     public Person(string name = "") 
     { 
      Id = 8; 
      Name = name; 
     } 
    } 

    public class Engineer : Person 
    { 
     public int Problems { get; private set; } 
     public Engineer(string name = "") 
      : base(name) 
     { 
      Problems = 88; 
     } 
    } 

    [TestFixture] 
    public class EngineerFixture 
    { 
     [Test] 
     public void Ctor_SetsProperties_AsSpecified() 
     { 
      var e = new Engineer("bogus"); 
      Assert.AreEqual("bogus", e.Name); 
      Assert.AreEqual(88, e.Problems); 
      Assert.AreEqual(8, e.Id); 
     } 
    }