遞歸菜單生成器C＃

Question

我需要建立一個breadscrum /路徑爲一療程上市現場

如課程都有不同的菜單項目，我需要顯示然後如下

• CHAPTER01/
• CHAPTER01/Lesson01/
• CHAPTER01/Lesson01/Exam01/
• CHAPTER01/Lesson01/Exam01 /問題03/
• CHAPTER01/Lesson0 1/Exam01 /問題04 /項目01
• CHAPTER01/Lesson02/
• Chapter02
• Chapter02/Lesson01

以上僅僅是項目如何能得到安排的路徑爲例

爲了想出這個我有一個項目的名單

Public Class Item 
{ 
    public string Level 
    { 
     get; 
     set; 
    } 

    public string Title 
    { 
     get; 
     set; 
    } 
} 

列表可以如下創建

IList<Item> Items = new List<Item>(); 
Items.Add (new Item {Level = "0", Title = "Chapter01"}); 
Items.Add (new Item {Level = "1", Title = "Lesson01"}); 
Items.Add (new Item {Level = "2", Title = "Exam01"}); 
Items.Add (new Item {Level = "3", Title = "Question 03"}); 
Items.Add (new Item {Level = "3", Title = "Question 04"}); 
Items.Add (new Item {Level = "4", Title = "Item 01"}); 
Items.Add (new Item {Level = "1", Title = "Lesson02"}); 

Items.Add (new Item {Level = "0", Title = "Chapter02"}); 
Items.Add (new Item {Level = "1", Title = "Lesson01"}); 

父項目總會有水平爲0和孩子將有1,2,3等..

誰能掌舵我拿出一個遞歸函數C＃實現這個

Answer 1

我最後的做法是將菜單項組合成一個菜單項。例如：

public class MenuItem{ 
    public string Caption {get; set;} 
    public int Level {get; set; } 
    public List<MenuItem> MenuItems {get; set;} 
    public MenuItem(string caption){ 
     Caption = caption; 
     MenuItems = new List<MenuItem>(); 
    } 
} 

然後，當你建立你的菜單結構，你開始一個List<MenuItem>將舉行您頂層菜單項的對象，然後MenuItems.Add(new MenuItem("Question 1"))。

當你已經建立了您的層次結構，您可以將其使用類似的輸出：

private void DisplyMenuStructure(List<MenuItems> menu){ 
    foreach(MenuItem currentItem in menu){ 
     if (currentItem.MenuItems.Count>0){ 
      DisplayMenuStructure(currentItem.MenuItems); 
     } else { 
      Console.WriteLine(currentItem.Caption); 
     } 
    } 
} 

要填充層次使用這樣的事情：

public void BuildMenumStructure(){ 
    //Instantiate a File menu 
    MenuItem root = new MenuItem("File"); 
    root.Level = 0; 
    //Add some menu items 
    root.MenuItems.Add(new MenuItem("New"){Level = 1}); 
    root.MenuItems.Add(new MenuItem("Edit"){Level = 1}); 
    //Build a save menu and add it in 
    MenuItem saveMenu = new MenuItem("Save"); 
    saveMenu.MenuItems.Add(new MenuItem("Save As"){Level = 2}); 
    saveMenu.MenuItems.Add(new MenuItem("Save"){Level = 2}); 
    root.MenuItems.Add(saveMenu); 
}