C# 保存文件到文本。

public static void CreateWebLog(string logStr)
{
try
{
string dir = System.Web.HttpContext.Current.Server.MapPath("~/log");  //c端 Directory.GetCurrentDirectory() + "\\log";
if (Directory.Exists(dir) == false)
{
Directory.CreateDirectory(dir);
}
string strFilePath = System.Web.HttpContext.Current.Server.MapPath("~/log/log_" + DateTime.Now.ToString("yyyyMMdd") + ".txt");   //C端 Directory.GetCurrentDirectory()+("\\log\\log_" + DateTime.Now.ToString("yyyyMMdd") + ".txt");
FileInfo logFile = new FileInfo(strFilePath);
System.IO.FileStream fs;
if (logFile.Exists)
{
fs = new System.IO.FileStream(strFilePath, System.IO.FileMode.Append);
}
else
{
fs = new System.IO.FileStream(strFilePath, System.IO.FileMode.Create);
}
System.IO.StreamWriter sw = new System.IO.StreamWriter(fs, System.Text.Encoding.Default);
sw.WriteLine("-----------------------------" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + "------------------------------------");
sw.WriteLine(logStr);
sw.Close();
fs.Close();
}
catch (Exception)
{

}

}