class as tree（包含其类型列表的类） [英] class as tree (class that contain list of it's type)

问题描述

我有这个类 StudentsGroup ，它还包含 HashSet< StudentsGroup>

< pre lang =C＃> public class StudentsGroup
{
public string 名称;
public int StudentsCount;
public HashSet< StudentsGroup>子群;

public StudentsGroup（）
{
SubGroups = new HashSet< StudentsGroup>（）;
Name = no_name;
}
public StudentsGroup（ string name， int studens_count = 0 ）： this （）
{
姓名=姓名;
StudentsCount = studens_count;
}
}

如何将元素添加到子组及其子组以分层方式。

例如我可以使用此代码添加项目

  //   ex AddGroup（新的StudentsGroup（第一年，第一部分，第1组，第1组），0,0,0 ）;  
 此 .SubGroups。 
 ElementAt（ 0 ）。子组。 
 ElementAt（ 0 ）。子组。 
 ElementAt（ 0 ）。子组。 
添加（新 StudentsGroup（ 第一年，第1部分，第1组，第1组））; 

现在我该如何实现函数 AddGroup 采用元素实例和父索引，如果父元素不存在则返回错误

  public   void  AddGroup（StudentsGroup  group ， params   int  [] ParentIndex）
 {
  //  方法体 
} 

我的意思

比较这两种情况

 StudentsGroup school =  new  StudentsGroup（ 学校）; 
  //  每年添加三年包含两个班级 
 school.SubGroups。添加（
  new  StudentsGroup（  year1 ））; 
 school.SubGroups.Add（
  new  StudentsGroup（  YEAR2\" ））; 
 school.SubGroups.Add（
  new  StudentsGroup（  year3\" ））; 
 school.SubGroups.ElementAt（ 0 ）。SubGroups.Add（
  new  StudentsGroup（  class1））; 
 school.SubGroups.ElementAt（ 0 ）。SubGroups.Add（
  new  StudentsGroup（  class2））; 
 school.SubGroups.ElementAt（ 1 ）。SubGroups.Add（
  new  StudentsGroup（  class1））; 
 school.SubGroups.ElementAt（ 1 ）。SubGroups.Add（
  new  StudentsGroup（  class2））; 
 school.SubGroups.ElementAt（ 2 ）。SubGroups.Add（
  new  StudentsGroup（  class1））; 
 school.SubGroups.ElementAt（ 2 ）。SubGroups.Add（
  new  StudentsGroup（  class2））; 
  //  如果我实施AddGroup（组，父索引） 
 school。 AddGroup（ new  StudentsGroup（  year1 ）， 0 ）; 
 school.AddGroup（ new  StudentsGroup（  year2）， 0 ）; 
 school.AddGroup（ new  StudentsGroup（  year3）， 0 ）; 
 school.AddGroup（ new  StudentsGroup（  class1）， 0 ， 0 ）; 
 school.AddGroup（ new  StudentsGroup（  class2）， 0 ， 0 ）; 
 school.AddGroup（ new  StudentsGroup（  class1）， 0 ， 1 ）; 
 school.AddGroup（ new  StudentsGroup（  class2）， 0 ， 1 ）; 
 school.AddGroup（ new  StudentsGroup（  class1）， 0 ， 2 ）; 
 school.AddGroup（ new  StudentsGroup（  class2）， 0 ， 2 ）; 

//以及当我们有10级子组时，动态添加使用方法将有助于代码编写

解决方案

  public   void  AddGroup（StudentsGroup  group  ， params   int  [] ParentIndex）
 {
 HashSet< StudentsGroup> last_subGroups =  this  .SubGroups; 
 StudentsGroup current =  this ; 
  for （ int  i =  1 ; i <  ParentIndex.Length; i ++）
 {
 last_subGroups = current.SubGroups; 
 current = current.SubGroups.ElementAt（ParentIndex [i]）; 
} 
 current.SubGroups.Add（ group ）; 
} 

I have this class StudentsGroup that also contain HashSet<StudentsGroup>

public class StudentsGroup
{
    public string Name;
    public int StudentsCount;
    public HashSet<StudentsGroup> SubGroups;

    public StudentsGroup()
    {
        SubGroups = new HashSet<StudentsGroup>();
        Name = "no_name";
    }
    public StudentsGroup(string name,int studens_count=0):this()
    {
        Name = name;
        StudentsCount = studens_count;
    }
}

how can I add element to SubGroups and its SubGroups in hierarchical way.
for example i can add item using this code

//ex AddGroup(new StudentsGroup("first year, section one,group 1,subgroup 1"),0,0,0);
            this.SubGroups.
                ElementAt(0).SubGroups.
                ElementAt(0).SubGroups.
                ElementAt(0).SubGroups.
                Add(new StudentsGroup("first year , section one , group 1 , subgroup 1"));

Now how can I implement function AddGroup that take element instance and parent index,and if parent not exist return error

public void AddGroup(StudentsGroup group, params int[] ParentIndex)
{
    //method body
}

what I mean
compare these two case

StudentsGroup school = new StudentsGroup("school");
//add three years each year contain two classes
school.SubGroups.Add(
	new StudentsGroup("year1"));
 school.SubGroups.Add(
	new StudentsGroup("year2"));
 school.SubGroups.Add(
	new StudentsGroup("year3"));
school.SubGroups.ElementAt(0).SubGroups.Add(
	new StudentsGroup("class1"));
school.SubGroups.ElementAt(0).SubGroups.Add(
	new StudentsGroup("class2"));
school.SubGroups.ElementAt(1).SubGroups.Add(
	new StudentsGroup("class1"));
school.SubGroups.ElementAt(1).SubGroups.Add(
	new StudentsGroup("class2"));
school.SubGroups.ElementAt(2).SubGroups.Add(
	new StudentsGroup("class1"));
school.SubGroups.ElementAt(2).SubGroups.Add(
	new StudentsGroup("class2"));
//if i implement AddGroup(group,parent index)
school.AddGroup(new StudentsGroup("year1"), 0);
school.AddGroup(new StudentsGroup("year2"), 0);
school.AddGroup(new StudentsGroup("year3"), 0);
school.AddGroup(new StudentsGroup("class1"), 0,0);
school.AddGroup(new StudentsGroup("class2"), 0, 0);
school.AddGroup(new StudentsGroup("class1"), 0, 1);
school.AddGroup(new StudentsGroup("class2"), 0, 1);
school.AddGroup(new StudentsGroup("class1"), 0, 2);
school.AddGroup(new StudentsGroup("class2"), 0, 2);

//and how about when we have 10 level of subGroups , dynamic add using method will facilitate code writing

解决方案

public void AddGroup(StudentsGroup group, params int[] ParentIndex)
{
	HashSet<StudentsGroup> last_subGroups = this.SubGroups;
	StudentsGroup current = this;
	for (int i = 1; i < ParentIndex.Length; i++)
	{
		last_subGroups = current.SubGroups;
		current = current.SubGroups.ElementAt(ParentIndex[i]);
	}
	current.SubGroups.Add(group);
}

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