C# C语言中的对象初始化#

当我有如下声明时：

class Professor
{
  string profid;
  public string ProfessorID
  {
     get { return profid;}
     set { profid=value;}
  }

  student st;

}


class student
{
  string name;
  string id;
  public string Name
  {
     get  { return name;}
     set  { name=value; } 
  }

 public string StudentID
 {
   get { return id;}
   set { id=value; }
 }

}


public void GetDetails()
{
  Professor prf=new Professor(){ ProfessorID=1, how to initialize student here?};

}

---

在GetDetails（）内部，我如何初始化学生？

您的

教授

类将需要学生的属性设置器，此时您可以编写：

public void GetDetails()
{
    Professor prf = new Professor { 
        ProfessorID = "1", 
        Student = new Student { Name = "Jon", StudentID = "1" }
    };    
}

如果没有该属性，

Professor

类中的任何内容都不会设置

st

变量

请注意，因为在这两种情况下我们只使用无参数构造函数，所以我从对象初始值设定项中删除了显式的

（）

进一步注意：自动实现的属性可以使代码更短：

class Professor
{
    public string ProfessorID { get; set; }
    public Student Student { get; set; }
}

class Student
{
    public string Name { get; set; }
    public string StudentID { get; set; }
}

---

你应该让学生成为教授：

class Professor
{
    string profid;
    public string ProfessorID
    {
        get { return profid; }
        set { profid = value; }
    }

    student st;

    public student Student { // New property
        get { return st; }
        set { st = value; }
    }
}


class student
{
    string name;
    string id;
    public string Name
    {
        get { return name; }
        set { name = value; }
    }

    public string StudentID
    {
        get { return id; }
        set { id = value; }
    }

}


public void GetDetails(){
    Professor prf=new Professor(){ ProfessorID="1", Student = new student()};
}

---

首先，使其可访问：

public student Student { get; set; }

然后是：

Professor prf = new Professor()
{
    ProfessorID = "abc",
    Student = new student { Name = "Marc", StudentID = "def" }
};

请注意，如果属性为“仅获取”：

private readonly student _student = new student();  
public student Student { get { return _student; }}

然后可以使用替代语法（设置属性而不尝试更改学生引用）：

---

你的学生需要一个在教授范围内的访问者

class Professor
{
  string profid;
  public string ProfessorID
  {
     get { return profid;}
     set { profid=value;}
  }

  public Student {
     get { return st;}
     set { st=value;}
  }

  student st;

}


public void GetDetails()
{
  Student s = new Student();
  s.StudentId = someId;
  s.name = someName;
  Professor prf = new Professor { ProfessorID=1, Student = s;};
}

---

但是，您当前的模型是1名教授：1名学生，您确定这就是您想要的吗？

继续关注John的答案：

您需要括号，而不是括号，但公共构造函数通常是正确的方法。另一种方法是使用公共属性的无参数构造函数

class Professor
{
  string profid;
  public string ProfessorID
  {
     get { return profid;}
     set { profid=value;}
  }

  public Student {
     get { return st;}
     set { st=value;}
  }

  student st;

}


public void GetDetails()
{
  Student s = new Student();
  s.StudentId = someId;
  s.name = someName;
  Professor prf = new Professor { ProfessorID=1, Student = s;};
}