//如何从文本文件中读取文本
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);
}
}
}

//在检测到文件结尾时向您发出通知。通过使用 ReadAll 或 ReadAllText 方法也可以实现此功能。
using System;using System.IO;
public class TextFromFile {
private const string FILE_NAME= "MyFile.txt";
public static void Main(String[] args)
{
if (!File.Exists(FILE_NAME))
{
Console.WriteLine("{0} does not exist.", FILE_NAME);
return;
}
using (StreamReader sr = File.OpenText(FILE_NAME))
{
String input;
while ((input=sr.ReadLine())!=null){
Console.WriteLine(input);
}
Console.WriteLine ("The end of the stream has been reached.");
sr.Close();
}
}