全部读取到字符串变量

string text = System.IO.File.ReadAllText(@'C:\Users\Public\TestFolder\WriteText.txt');System.Console.WriteLine('Contents of WriteText.txt = {0}', text);

一次读取一行

int counter = 0;  string line;    System.IO.StreamReader file =       new System.IO.StreamReader(@'c:\test.txt');  while((line = file.ReadLine()) != null)  {      System.Console.WriteLine(line);      counter++;  }    file.Close();  System.Console.WriteLine('There were {0} lines.', counter);

全部读取到字符串数组中，每个数组元素存储一行文本

string[] lines = System.IO.File.ReadAllLines(@'C:\Users\Public\TestFolder\WriteLines2.txt');
System.Console.WriteLine('Contents of WriteLines2.txt = ');foreach (string line in lines){ Console.WriteLine('\t' + line);}

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