Windows系统中使用C#读取文本文件内容的小示例

class ReadFromFile{  static void Main()  {    // The files used in this example are created in the topic    // How to: Write to a Text File. You can change the path and    // file name to substitute text files of your own.    // Example #1    // Read the file as one string.    string text = System.IO.File.ReadAllText(@"C:/Users/Public/TestFolder/WriteText.txt");    // Display the file contents to the console. Variable text is a string.    System.Console.WriteLine("Contents of WriteText.txt = {0}", text);    // Example #2    // Read each line of the file into a string array. Each element    // of the array is one line of the file.    string[] lines = System.IO.File.ReadAllLines(@"C:/Users/Public/TestFolder/WriteLines2.txt");    // Display the file contents by using a foreach loop.    System.Console.WriteLine("Contents of WriteLines2.txt = ");    foreach (string line in lines)    {      // Use a tab to indent each line of the file.      Console.WriteLine("/t" + line);    }    // Keep the console window open in debug mode.    Console.WriteLine("Press any key to exit.");    System.Console.ReadKey();  }}

int counter = 0;string line;// Read the file and display it line by 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);// Suspend the screen.System.Console.ReadLine();