创建目录并生成文本

public void CreateTxt(Vector3d[] Points)
        {
            if (Points.Length == 0) return;
            string dirname = Path.Combine(WorldSettings.StartupDirectory, @"TempPoints");
            DirectoryInfo dir = new DirectoryInfo(dirname);
            if (!dir.Exists)
            {
                dir.Create();
            }
            string dircoor = dirname + @"Points.txt";
            string tex = string.Empty;
            for (int i = 0; i < Points.Length; i++)
            {
                tex += Points[i].X.ToString() + ",";
                tex += Points[i].Y.ToString() + ",";
                tex += Points[i].Z.ToString() + ",";
                //tex += "
";
            }
            System.IO.File.WriteAllText(dircoor, tex);
            MessageBox.Show("Points.txt创建成功！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);

        }