允许用户在C#中浏览文件的最佳方法是什么？

using System;
using System.IO;

class Program
{
    static void Main(string[] args)
    {
        string path = @"C:\example";

        foreach (string file in Directory.EnumerateFiles(path))
        {
            Console.WriteLine(file);
        }

        foreach (string directory in Directory.EnumerateDirectories(path))
        {
            Console.WriteLine(directory);
        }
    }
}

using System;
using System.IO;

class Program
{
    static void Main(string[] args)
    {
        string filePath = @"C:\example\file.txt";

        if (File.Exists(filePath))
        {
            Console.WriteLine("File exists.");
        }
        else
        {
            Console.WriteLine("File does not exist.");
        }
    }
}

using System;
using System.IO;

class Program
{
    static void Main(string[] args)
    {
        string filePath = @"C:\example\file.txt";

        if (File.Exists(filePath))
        {
            string content = File.ReadAllText(filePath);
            Console.WriteLine(content);
        }
        else
        {
            Console.WriteLine("File does not exist.");
        }
    }
}