private const string TXTPATH=@"e:\folder\";
private const string TXTPOSTFIX = ".txt";
private const int DATADISTANCE = 5;
private const int TABDISTANCE=8;

private void button3_Click(object sender, System.EventArgs e)
{
string tempFileName = null;
tempFileName = GetTempFileName();
//创建一个.txt文件，文件名用系统时间生成精确到毫秒
FileInfo file = new FileInfo(TXTPATH+tempFileName+TXTPOSTFIX);
StreamWriter textFile = null;
try
{
textFile = file.CreateText();
MessageBox.Show("a");
}
catch
{
System.Windows.Forms.MessageBox.Show("系统找不到指定目录下的文件： "+TXTPATH+tempFileName+TXTPOSTFIX);
return;
}
System.Windows.Forms.MessageBox.Show("数据文件已保存到"+" "+file.FullName);
}
public string GetTempFileName()
{
return DateTime.Now.ToString("yyyyMMddhhmmssfff");
}
这也算是一个建立.txt文件的方法吧....但我想让弹出一个对话框............让用户自己选择路径和名字.....应该怎么写最好给个代码...我刚才写了写那个对话框..........不知道怎么来找到路径.......请高手指点 FileInfo file = new FileInfo(????????);.这里的?号就是路径.....

怎么没有人会吗?
帮解决了可以给分的........

发现现在这里有点冷清了..........呵

System.Windows.Forms.OpenFileDialog fd=new OpenFileDialog();
fd.Filter="TXT Files(*.txt)|*.txt";
if(fd.ShowDialog()== DialogResult.OK)
{
this.txtpach.Text=fd.FileName.ToString();
}

就这样

StringBuilder sb = new System.Text.StringBuilder();
SaveFileDialog dlgSaveFile=new SaveFileDialog();
dlgSaveFile.Title="保存文件";
dlgSaveFile.Filter="文本文件(*.txt)|*.txt|All Files(*.*)|*.*";
if(dlgSaveFile.ShowDialog()==DialogResult.OK)
{
string fileName=dlgSaveFile.FileName;
FileStream aFile=new FileStream(fileName,FileMode.OpenOrCreate);
StreamReader read = new StreamReader(aFile);
string sdr =read.ReadLine();
string ddt= "";
if(sdr!=null)
{
ddt += sdr;
ddt +="\r\n";
sb.Append(ddt);
sdr =read.ReadLine();
}
StreamWriter sw=new StreamWriter(aFile);
sb.Append("i lovsdsdsdsdsdsdsdsdsceupi");
sb.Append("\r\n");
sb.Append("sdsdsdsds");
sw.Write(sb);
sw.Close();