基本文件读写

//第一个参数文件名，第二个参数打开方法，第三个参数读写模式，第四个参数共享设定
FileStream F = new FileStream("sample.txt", FileMode.Open, FileAccess.Read, FileShare.Read);

文本本件读写

//读取文本文件
using (StreamReader sr = new StreamReader("c:/jamaica.txt"))
{
    string line;

    // 从文件读取并显示行，直到文件的末尾 
    while ((line = sr.ReadLine()) != null)
    {
        Console.WriteLine(line);
    }
}
//写入文本文件
using (StreamWriter sw = new StreamWriter("names.txt"))
{
    foreach (string s in names)
    {
        sw.WriteLine(s);

    }
}

二进制文件读写

//打开二进制文件，注意二进制的Writer和Reader由FileStream构造
//写二进制文件
try
{
    bw = new BinaryWriter(new FileStream("mydata",
                FileMode.Create));
}
catch (IOException e)
{
    Console.WriteLine(e.Message + "\n Cannot create file.");
    return;
}
//读二进制文件
try
{
    br = new BinaryReader(new FileStream("mydata",
                FileMode.Open));
}
catch (IOException e)
{
    Console.WriteLine(e.Message + "\n Cannot open file.");
    return;
}

//读写常用方法
br.Read()
br.ReadBoolean()
br.ReadByte()
br.ReadBytes(int count)
br.ReadChar()
br.ReadChars(int count)
br.ReadDouble()