用StreamWriter向文本中写文件,怎么样追加啊,我写进去怎么都是修改掉以前的啊?

[gyhongjun]

用StreamWriter向文本中写文件,怎么样追加啊,我写进去怎么都是修改掉以前的啊?

[helloqiqi]

StreamWrite sw;
sw=File.AppendText(MapPath("aaa.txt"));//用AppendText而不是CreatText
sw.WriteLine(TextBox1.Text);
sw.Close();

[l_clove]

Log = new StreamWriter(filename, true); //true表示如果当前文件存在则向其添加内容。

[wudixiaocaoren]

File.AppendText(MapPath("aaa.txt"));//用AppendText而不是CreatText

[gOODiDEA]

参考：

public bool WriteLogFile( string _FilePath, string _FileContent )
{
try
{
System.IO.FileStream oFileStream;
if ( ! System.IO.File.Exists( _FilePath ) )
{
oFileStream = new System.IO.FileStream( _FilePath, System.IO.FileMode.Create, System.IO.FileAccess.Write, System.IO.FileShare.ReadWrite );
}
else
{
oFileStream = new System.IO.FileStream( _FilePath, System.IO.FileMode.Append, System.IO.FileAccess.Write, System.IO.FileShare.ReadWrite );
}
System.IO.StreamWriter oStreamWriter = new System.IO.StreamWriter( oFileStream, System.Text.Encoding.Default );
oStreamWriter.Write( _FileContent );
oStreamWriter.WriteLine();
oStreamWriter.Close();
oFileStream.Close();
return true;
}
catch( System.Exception ex )
{
System.Web.HttpContext.Current.Response.Write( ex.ToString() );
return false;
}
}