对象变量只显示最后一个值

Question

下面的代码 returns 循环中只有最近的值。我需要做什么才能显示正在迭代的所有值？我使用此方法而不是 SearchOption.AllDirectory 的原因是因为存在我无法访问的文件夹路径。我确实尝试将 UnauthorizedAccessException 与 try 和 catch 一起使用，但是 returns 是一个空值，因为它一直在终止循环。

public void Main()
{
    string path = @"drive"; // TODO  
    ApplyAllFiles(path, ProcessFile);
}    

public void ProcessFile(string path) 
{
    /* ... */
}

public void ApplyAllFiles(string folder, Action<string> fileAction)
{
    System.Collections.ArrayList FileList = new System.Collections.ArrayList();
    List<string> logger = new List<string>();

    DateTime DateFilter = DateTime.Now.AddMonths(-6);

    foreach (string file in Directory.GetDirectories(folder))
    {
        fileAction(file);
    }
    foreach (string subDir in Directory.GetDirectories(folder))
    {
        string rootfolder = "root folder";

        if (subDir.Contains(rootfolder))
        {   
            FileList.Add(subDir);
            Dts.Variables["User::objDirectoryList"].Value = FileList;
           //MessageBox.Show(subDir);
        }
        try
        {
            ApplyAllFiles(subDir, fileAction);
        }
        catch (UnauthorizedAccessException e)
        {
            logger.Add(e.Message);

        }
        catch (System.IO.DirectoryNotFoundException e)
        {
            logger.Add(e.Message);
        }
    }
}

Answer 1

尝试去掉函数外的FileList声明，也去掉循环外的Dts.Variables["User::objDirectoryList"].Value = FileList;：

System.Collections.ArrayList FileList = new System.Collections.ArrayList();

public void Main()
{
    string path = @"drive"; // TODO  
    ApplyAllFiles(path, ProcessFile);
    Dts.Variables["User::objDirectoryList"].Value = FileList;
}    

public void ProcessFile(string path) 
{
    /* ... */
}

public void ApplyAllFiles(string folder, Action<string> fileAction)
{

    List<string> logger = new List<string>();

    DateTime DateFilter = DateTime.Now.AddMonths(-6);

    foreach (string file in Directory.GetDirectories(folder))
    {
        fileAction(file);
    }
    foreach (string subDir in Directory.GetDirectories(folder))
    {
        string rootfolder = "root folder";

        if (subDir.Contains(rootfolder))
        {   
            FileList.Add(subDir);
            //MessageBox.Show(subDir);
        }
        try
        {
            ApplyAllFiles(subDir, fileAction);
        }
        catch (UnauthorizedAccessException e)
        {
            logger.Add(e.Message);

        }
        catch (System.IO.DirectoryNotFoundException e)
        {
            logger.Add(e.Message);
        }
    }
}

对象变量只显示最后一个值

Object variable only showing the last value

c#

arrays

ssis

etl

subdirectory