Why my list is not getting updated even after clicking button multiple times?

Hi I have a list which contains information of files from a path.After deleting files ,the list gets not get refreshed.When also clicking the button to show the list,it does not get updated.
If I close my app and click the button to list map,the list show all the files correctly.

Code (CSharp):

1.  public void ListMap()
2.     {
3.         Listobject.Clear();
4.      
5.         panellist.SetActive(true);
6.         string mainpath = Application.persistentDataPath;
7.         DirectoryInfo dir = new DirectoryInfo(mainpath);
8.  
9.  
10.            // infos = dir.GetFileSystemInfos("*.worldmap").OrderBy(i => i.CreationTime).ToArray();
11.           infos = dir.GetFileSystemInfos("*.json").OrderBy(i => i.CreationTime).ToArray();
12.           infomaps = dir.GetFileSystemInfos("*.worldmap").OrderBy(i => i.CreationTime).ToArray();
13.      
14.         for(int i = 1;i<=infos.Length;i++)
15.         {
16.          
17.          
18.             if (Parentcontent.childCount > 0)
19.             {
20.                 GameObject gg = Parentcontent.GetChild(i - 1).gameObject;
21.                 Destroy(gg);
22.            
23.             }
24.  
25.             lisobj = Instantiate(prefabpanellist);
26.             Listobject.Add(lisobj);
27.  
28.  
29.  
30.         }
31.  
32.      
33.  
34.         for (int i = 0; i < infos.Length; i++)
35.          
36.         {
37.  
38.  
39.  
40.             Listobject[i].transform.SetParent(Parentcontent);
41.             var index = i;
42.          
43.             var button = Listobject[i].transform.GetChild(3).GetComponent<Button>();
44.             var Loadbutton=Listobject[i].transform.GetChild(2).GetComponent<Button>();
45.  
46.             button.onClick.AddListener(() => Deleteinformation(index));
47.        
48.  
49.             var numText = Listobject[i].transform.GetChild(0).GetComponent<Text>();
50.             numText.text = (i+1).ToString();
51.      
52.  
53.             var filenameText = Listobject[i].transform.GetChild(1).GetComponent<Text>();
54.             filenameText.text = infos[i].Name;
55.             string Filename = filenameText.text;
56.             Loadbutton.onClick.AddListener(() => Load(Filename));
57.        
58.         }
59.  
60.      
61.  
62.    
63.     }
64.  
65.     public void Deleteinformation(int index)
66.     {
67.         Debug.Log("Index is " + index);
68.         string mapnamewithpath = infos[index].Name;
69.         string mapnam =  Path.GetFileNameWithoutExtension(mapnamewithpath);
70.  
71.         //  Debug.Log("Path is " + infos[index].FullName);
72.  
73.  
74.  
75. #if UNITY_EDITOR
76.  
77.         {
78.             File.Delete(infos[index].FullName);
79.  
80.             Debug.Log("Path is " + infos[index].FullName);
81.             Deletetext(mapnam, "data.txt");
82.         }
83.  
84.  
85. #else
86.         {
87.  
88.         Debug.Log("Path is " + infomaps[index].FullName);
89.         // Listobject.RemoveAt(index);
90.         Destroy(Listobject[index]);
91.         File.Delete(infos[index].FullName);
92.         File.Delete(infomaps[index].FullName);
93.  
94.         Deletetext(mapnam, "data.txt");
95.         Deletetext(mapnam, "world.txt");
96.  
97.  
98.         }
99.  
100.  
101. #endif
102.  
103.         Debug.Log("Delete Path is " + mapnam);
104.      
105.      
106.         BackMap();
107.  
108.  
109.     }
110.  

 

How are you detecting when the file system is changed - you havent posted any code relating to this

Your ListMap function is set up incorrectly
You are deleting existing buttons based on the number of files found
If you have 6 buttons, but only 4 files, you will only delete 4 buttons. You should probably be deleting all buttons
for(int i = 0;i<Parentcontent.childCount;i++)
then instantiate by infos.length

 

I have added the below method to the above code,how to chk if files have been changed?

Code (CSharp):

1.  public void CreateFileWatcher(string path)
2.     {
3.         // Create a new FileSystemWatcher and set its properties.
4.         FileSystemWatcher watcher = new FileSystemWatcher();
5.         watcher.Path = path;
6.         /* Watch for changes in LastAccess and LastWrite times, and
7.            the renaming of files or directories. */
8.         watcher.NotifyFilter = NotifyFilters.LastAccess | NotifyFilters.LastWrite
9.            | NotifyFilters.FileName | NotifyFilters.DirectoryName;
10.         // Only watch text files.
11.         //watcher.Filter = "*.txt";
12.  
13.         // Add event handlers.
14.         watcher.Changed += new FileSystemEventHandler(OnChanged);
15.         watcher.Created += new FileSystemEventHandler(OnChanged);
16.         watcher.Deleted += new FileSystemEventHandler(OnChanged);
17.        // watcher.Renamed += new RenamedEventHandler(OnRenamed);
18.  
19.         // Begin watching.
20.         watcher.EnableRaisingEvents = true;
21.     }
22.  
23.     // Define the event handlers.
24.     private  void OnChanged(object source, FileSystemEventArgs e)
25.     {
26.         // Specify what is done when a file is changed, created, or deleted.
27.         // Console.WriteLine("File: " + e.FullPath + " " + e.ChangeType);
28.  
29.         Debug.Log("File: " + e.FullPath + " " + e.ChangeType);
30.         string mainpath = Application.persistentDataPath;
31.         DirectoryInfo dir = new DirectoryInfo(mainpath);
32.         infos = dir.GetFileSystemInfos("*.json").OrderBy(i => i.CreationTime).ToArray();
33.         infomaps = dir.GetFileSystemInfos("*.worldmap").OrderBy(i => i.CreationTime).ToArray();
34.     }

 

If I pass the path to the method CreateFileWatcher(path) ...How will it call OnChanged event?Confused with how will it call Onchanged event without giving Correct arguments.

 

You need to call the method like:

Code (CSharp):

1.             string path = Application.dataPath + "/Test";
2.             CreateFileWatcher(path);

Then when you make a change you will see in the console:

File: E:\Work\Unity\Decorating\Assets\Test\asdf.txt Deleted

OnChanged is called by the FileSystemEventHandler