打开一个文本文件

 1            //打开一个文本文件
 2             if (openFileDialog1 .ShowDialog ()== DialogResult .OK )
 3             {
 4                 string file = openFileDialog1.FileName;
 5                 //如果不加 Encoding.Default，那么StreamReader默认编码为Unicode(UTF-8)
 6                 StreamReader sr = new StreamReader(file); 
 7 
 8                 ////增加一System.Text.Encoding.Default 则不传会出现乱码。, System.Text.Encoding.Default
 9                 //StreamReader sr = new StreamReader(file,Encoding .Default );  
10                 
11                 //显示当前流的字符编码
12                 //MessageBox.Show(sr.CurrentEncoding.EncodingName);
13                 
14                 string s = sr.ReadLine();
15                 
16                 while (s != null)
17                 {
18                     textBox1.AppendText(s + "\r\n");
19                     s = sr.ReadLine();
20       
21                 }
22                 sr.Close();
23             }
24         }