一个文件操作的集合，包含文件的读取，写入，判存，删除等。

using System.Collections.Generic;
using System.IO;
using System.Text;
public class FileManager
{
    public static bool Exits(string path)
    {
        return File.Exists(path);
    }
    public static void Delete(string path)
    {
        File.Delete(path);
    }
    public static IEnumerable ReadLine(string path)
    {
        using (StreamReader reader = new StreamReader(path, Encoding.Default))
        {
            while (!reader.EndOfStream)
            {
                yield return reader.ReadLine();
            }
            reader.Close();
            reader.Dispose();
        }
    }
    public static string ReadFile(string path)
    {
        if (!Exits(path))
            return null;
        using (StreamReader reader = new StreamReader(path, Encoding.Default))
        {
            string content = reader.ReadToEnd();
            reader.Close();
            reader.Dispose();
            return content;
        }
    }
    public static void WriteLine(string path, string content, bool append = false)
    {
        CheckDirectory(path, true);
        using (StreamWriter writer = new StreamWriter(path, append, Encoding.Default))
        {
            writer.WriteLine(content);
            writer.Flush();
            writer.Close();
            writer.Dispose();
        }
    }
    public static void WriteFile(string path, string content, bool append = false)
    {
        CheckDirectory(path, true);
        using (StreamWriter writer = new StreamWriter(path, append, Encoding.Default))
        {
            writer.Write(content);
            writer.Flush();
            writer.Close();
            writer.Dispose();
        }
    }
    public static void SaveStream(string path, byte[] data)
    {
        CheckDirectory(path, true);
        using (FileStream stream = new FileStream(path, FileMode.Create))
        {
            stream.Write(data, 0, data.Length);
            stream.Flush();
            stream.Close();
            stream.Dispose();
        }
    }
    public static byte[] ReadStream(string path)
    {
        if (!Exits(path))
            return null;
        using (FileStream stream = new FileStream(path, FileMode.Open))
        {
            byte[] data = new byte[stream.Length];
            stream.Read(data, 0, (int)stream.Length);
            stream.Close();
            stream.Dispose();
            return data;
        }
    }
    public static bool CheckDirectory(string path, bool autoCreat = false)
    {
        int lastIndex = path.LastIndexOf('/');
        lastIndex = lastIndex < 0 ? path.LastIndexOf('\\') : lastIndex;
        path = path.Substring(0, lastIndex);
        bool exits = Directory.Exists(path);
        if (!exits && autoCreat)
        {
            DirectoryInfo dict = Directory.CreateDirectory(path);
        }
        return exits;
    }
}

2017/7/16 修改 SaveStream方法的FileMode由OpenOrCreate改为Create