如何向txt文件追加信息

Question

string path = @"..\..\ErrorMesage";
if(!System.IO.Directory.Exists(path))
{
    System.IO.Directory.CreateDirectory(path);
    using(StreamWriter sw = File.CreateText(path+@"\errorMessage.txt"))
    {
        sw.WriteLine("【");
        sw.WriteLine("错误时间:"+dt);
        sw.WriteLine("错误信息:"+errorMessage);
        sw.WriteLine("错误位置:"+StackTrace);
        sw.WriteLine("】");
        sw.WriteLine("\r\n");
    }
}
else
{
    using(StreamWriter sw = File.CreateText(path+@"\errorMessage.txt"))
    {
        sw.WriteLine("【");
        sw.WriteLine("错误发生时间:"+dt);
        sw.WriteLine("错误信息:"+errorMessage);
        sw.WriteLine("错误发生位置:"+StackTrace);
        sw.WriteLine("】");
        sw.WriteLine("\n");
     }
}
这样每次有错误信息的写入的时候,都会覆盖上一次的信息,如何追加在后面而不是覆盖呢?

Answer 1

StreamWriter sw = File.CreateText(path+@"\errorMessage.txt"))改为
StreamWriter sw = new StreamWriter(path+@"\errorMessage.txt",true)

Answer 2

使用重载的构造函数，指定追加方式为true

Answer 3

System.IO.StreamWriter sw = new System.IO.StreamWriter(path+@"\errorMessage.txt",true);

Answer 4

using(StreamWriter sw = File.AppendText(path+@"\errorMessage.txt"))
    {
        sw.WriteLine("【");
        sw.WriteLine("错误发生时间:"+dt);
        sw.WriteLine("错误信息:"+errorMessage);
        sw.WriteLine("错误发生位置:"+StackTrace);
        sw.WriteLine("】");
        sw.WriteLine("\n");
     }

Answer 5

StreamWriter sw = File.AppendText(LogFile);
                try
                {
                    sw.WriteLine(string.Format("[{0}] [{1}] [Visit] [{2}]", DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss"), ip, GetIpPosition(ip)));
                }
                catch { }
                finally
                {
                    sw.Close();
                }