求救----对文件的操作

Question

public void Page_Load(Object src,EventArgs e)
{
//建立StreamWriter为写做准备
StreamWriter rw = File.CreateText(Server.MapPath(".")+"\\CreateText.txt");
//使用WriteLine写入内容
rw.WriteLine("File.CreateText Method");
rw.WriteLine("Creates a StreamWriter that writes a new text file on the specified fully qualified path.");
rw.WriteLine("path can be a relative path or a file name, including a file on a Universal Naming Convention (UNC) share.");
//将缓冲区的内容写入文件
rw.Flush();
//关闭rw对象
rw.Close();

//打开文本文件
StreamReader sr = File.OpenText(Server.MapPath(".")+"\\CreateText.txt");
StringBuilder output = new StringBuilder();
string rl;
while((rl=sr.ReadLine())!=null)
{
output.Append(rl+"<br>");
}
lblFile.Text = output.ToString();
sr.Close();}

Answer 1

public void CreateTextFile(string fileName, string textToAdd) 
{
    string logFile = DateTime.Now.ToShortDateString()
        .Replace(@"/",@"-").Replace(@"\",@"-") + ".log";
    
    FileStream fs = new FileStream(fileName,
        FileMode.CreateNew, FileAccess.Write, FileShare.None);
    
    StreamWriter swFromFile = new StreamWriter(logFile);
    swFromFile.Write(textToAdd);
    swFromFile.Flush();
    swFromFile.Close();    StreamWriter swFromFileStream = new StreamWriter(fs);
    swFromFileStream.Write(textToAdd);
    swFromFileStream.Flush();
    swFromFileStream.Close();    StreamWriter swFromFileStreamDefaultEnc = 
        new System.IO.StreamWriter(fs, 
        System.Text.Encoding.Default);
    swFromFileStreamDefaultEnc.Write(textToAdd);
    swFromFileStreamDefaultEnc.Flush();
    swFromFileStreamDefaultEnc.Close();    StreamWriter swFromFileTrue = 
        new StreamWriter(fileName,true);
    swFromFileTrue.Write(textToAdd);
    swFromFileTrue.Flush();
    swFromFileTrue.Close();
    
    StreamWriter swFromFileTrueUTF8Buffer = 
        new StreamWriter(fileName, 
        true, System.Text.Encoding.UTF8,512);
    swFromFileTrueUTF8Buffer.Write(textToAdd);
    swFromFileTrueUTF8Buffer.Flush();
    swFromFileTrueUTF8Buffer.Close();    StreamWriter swFromFileTrueUTF8 = 
        new StreamWriter(fileName, true,
        System.Text.Encoding.UTF8);
    swFromFileTrueUTF8.Write(textToAdd);
    swFromFileTrueUTF8.Flush();
    swFromFileTrueUTF8.Close();    StreamWriter swFromFileStreamUTF8Buffer = 
        new StreamWriter(fs, System.Text.Encoding.UTF8, 512);
    swFromFileStreamUTF8Buffer.Write(textToAdd);
    swFromFileStreamUTF8Buffer.Flush();
    swFromFileStreamUTF8Buffer.Close();
}

Answer 2

FileStream fs = new FileStream ( "C:\\file.txt"  , FileMode.Create , FileAccess.Write ) ;
StreamWriter m_streamWriter = new StreamWriter ( fs ) ;
m_streamWriter.Flush ( ) ;
// 使用StreamWriter来往文件中写入内容
m_streamWriter.BaseStream.Seek ( 0 , SeekOrigin.Begin ) ;
// 把richTextBox1中的内容写入文件
m_streamWriter.Write (TextBox1.Text ) ;
//关闭此文件
m_streamWriter.Flush ( ) ;
m_streamWriter.Close ( ) ; 
MessageBox.Show ("设置信息已经成功");
this.Close ();