异常文件夹:拒绝访问路径

Question

我使用以下代码访问 4 个文件夹。但是，有1个文件夹是私人的，只有老年人才能访问它。如何避免该文件夹并仍然访问其他 4 个文件夹？

class Program
{
    const string FILENAME = @"H:Personaltext.xml";
    const string FOLDER = @"F:Apps";
    static XmlWriter writer = null;
    static void Main(string[] args)
    {
        XmlWriterSettings settings = new XmlWriterSettings
        {
            Indent = true
        };
        writer = XmlWriter.Create(FILENAME, settings);
        writer.WriteStartDocument(true);
        DirectoryInfo info = new DirectoryInfo(FOLDER);
        WriteTree(info);
        writer.WriteEndDocument();
        writer.Flush();
        writer.Close();
        Console.WriteLine("Enter Return");
        Console.ReadLine();
    }

编辑：(写树代码(我添加了其余的代码，其中还包括WriteTree代码。我无权访问管理文件夹。

    static long WriteTree(DirectoryInfo info)
    {  
    long size = 0;
        writer.WriteStartElement("Folder");
        try
        {
            writer.WriteAttributeString("name", info.Name);
            writer.WriteAttributeString("numberSubFolders", info.GetDirectories().Count().ToString());
            writer.WriteAttributeString("numberFiles", info.GetFiles().Count().ToString());
            writer.WriteAttributeString("date", info.LastWriteTime.ToString());

            foreach (DirectoryInfo childInfo in info.GetDirectories())
            {
                size += WriteTree(childInfo);
            }
        }
        catch (Exception ex)
        {
            string errorMsg = string.Format("Exception Folder : {0}, Error : {1}", info.FullName, ex.Message);
            Console.WriteLine(errorMsg);
            writer.WriteElementString("Error", errorMsg);
        }
        FileInfo[] fileInfo = null;
        try
        {
            fileInfo = info.GetFiles();
        }
        catch (Exception ex)
        {
            string errorMsg = string.Format("Exception FileInfo : {0}, Error : {1}", info.FullName, ex.Message);
            Console.WriteLine(errorMsg);
            writer.WriteElementString("Error", errorMsg);
        }
        if (fileInfo != null)
        {
            foreach (FileInfo finfo in fileInfo)
            {
                try
                {
                    writer.WriteStartElement("File");
                    writer.WriteAttributeString("name", finfo.Name);
                    writer.WriteAttributeString("size", finfo.Length.ToString());
                    writer.WriteAttributeString("date", info.LastWriteTime.ToString());
                    writer.WriteEndElement();
                    size += finfo.Length;
                }
                catch (Exception ex)
                {
                    string errorMsg = string.Format("Exception File : {0}, Error : {1}", finfo.FullName, ex.Message);
                    Console.WriteLine(errorMsg);
                    writer.WriteElementString("Error", errorMsg);
                }
            }
        }
        writer.WriteElementString("size", size.ToString());
        writer.WriteEndElement();
        return size;
    }
  }
 }

错误：异常文件夹：错误：对路径的访问被拒绝。

Answer 1

您可以在使用理查德维登的答案写入文件之前检查权限： 在 .NET 中检查目录和文件写入权限

或者，您可以在 WriteTree() 函数中使用 try catch 来忽略UnauthorizedAccessException异常，例如：

try {
    writer.WriteAttributeString("name", info.Name);
    [...]
} catch (Exception ex) {
    // If is a permission error, ignore exception
    if (ex is UnauthorizedAccessException)
         return size;
    // custom error log
    string errorMsg = string.Format("Exception Folder : {0}, Error : {1}", info.FullName, ex.Message);
    Console.WriteLine(errorMsg);
    writer.WriteElementString("Error", errorMsg);
}