StreamReader sr = new StreamReader(@"D:\a.txt");
int lineCount = 0;
while (sr.Peek() > 0)
{
lineCount ++;
MessageBox.Show(lineCount.ToString() + "行：" + sr.ReadLine());
}
sr.Close();
 
 
 
 
 
 
 
 
 
 
C# code 

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);
}
}
}



http://msdn.microsoft.com/en-us/library/db5x7c0d.aspx
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
C# code 

StreamReader sr = new StreamReader(@"D:\a.txt");
for(int i=0;i<4;i++) sr.ReadLine();
string str = sr.ReadLine(); //內容1
str = sr.ReadLine(); //內容2
//……
sr.Close();