怎样读取txt指定行的数据
一个txt文件，有1000行，怎么快速读取第568行数据？

[解决办法]
两个办法，一个是
从头开始，重复
textreader.readline 568次，
一个是
全部读取进来，根据换行符（\r\n）分割到数组中，取下标567。
[解决办法]
streamreader,一行行读取，计数
[解决办法]
两种方法的代码演示，分别读取eula.txt文件的第100行。（你的电脑上没有这个文件你可以换别的试）。

C# code

string s1 = "";using (System.IO.TextReader tr = new System.IO.StreamReader("c:\\windows\\system32\\eula.txt")){    s1 = tr.ReadToEnd().Split(new string[] { "\r\n" }, StringSplitOptions.None)[99];}Console.WriteLine(s1);string s2 = "";using (TextReader tr = new System.IO.StreamReader("c:\\windows\\system32\\eula.txt")){    for (int i = 1; i < 100; i++) tr.ReadLine();    s2 = tr.ReadLine();}Console.WriteLine(s2);
[解决办法]
C# code
private void button1_Click(object sender, EventArgs e){          string[] arr= File.ReadAllLines("d:\\a.txt",Encoding.Default);          if(arr.Length>568)          {                MessageBox.Show(arr[568].ToString());          }}
[解决办法]
下面是示例代码

using System;
using System.IO;

class Test  
{
   public static void Main()  
   {
       try  
       {
           // Create an instance of StreamReader to read from a file.
           // The using statement also closes the StreamReader.
           using (StreamReader sr = new StreamReader("TestFile.txt"))  
           {
               String line;
               // Read and display lines from the file until the end of  
               // the file is reached.
               while ((line = sr.ReadLine()) != null)  
               {
                   Console.WriteLine(line);
               }
           }
       }
       catch (Exception e)  
       {
           // Let the user know what went wrong.
           Console.WriteLine("The file could not be read:");
           Console.WriteLine(e.Message);
       }
   }
}