c# txt文件的读写

namespace file
{
class MyFile
{
string FilePath;
byte[] byData = new byte[100];
public char[] MyData = new char[1000];
public string reslutstr = null;
public MyFile()
{ }
public MyFile(string path)
{
FilePath = path;
}
public void ReadFile1()
{
try
{
FileStream file = new FileStream(FilePath, FileMode.Open);
file.Seek(0, SeekOrigin.Begin);
file.Read(byData, 0, 100); //byData传进来的字节数组,用以接受FileStream对象中的数据,第2个参数是字节数组中开始写入数据的位置,它通常是0,表示从数组的开端文件中向数组写数据,最后一个参数规定从文件读多少字符.
Decoder d = Encoding.Default.GetDecoder();
d.GetChars(byData, 0, byData.Length, MyData, 0);
//Console.WriteLine(MyData);
foreach (char ch in MyData)
{
reslutstr += ch.ToString();
}
file.Close();
}
catch (IOException e)
{
Console.WriteLine(e.ToString());
}
}
public void ReadFile2()
{
StreamReader sr = new StreamReader(FilePath, Encoding.Default);
String line;
while ((line = sr.ReadLine()) != null)
{
reslutstr += line;
// Console.WriteLine(line.ToString());
}
}
public void SaveFile1(string savestr)
{
FileStream fs = new FileStream(FilePath, FileMode.Create);
//获得字节数组
byte[] data = System.Text.Encoding.Default.GetBytes(savestr);
//开始写入
fs.Write(data, 0, data.Length);
//清空缓冲区、关闭流
fs.Flush();
fs.Close();
}

public void SaveFile2()
{
FileStream fs = new FileStream(FilePath, FileMode.Create);
StreamWriter sw = new StreamWriter(fs);
//开始写入
sw.Write("Hello World!!!!");
//清空缓冲区
sw.Flush();
//关闭流
sw.Close();
fs.Close();
}
}
}
//调用方法：
MyFile MyFile = new MyFile(Filepath);
string result = null;
// MyFile.SaveFile1(savastr);
MyFile.SaveFile2();
MyFile.ReadFile2();