文件操作

// Java example code to create a new file
    try 
    {
        File file = new File("path and file_name");
        boolean success = file.createNewFile();
    }
    catch (IOException e)    {   }

// Java example code to delete a file.
    try 
    {
        File file = new File("path and file_name");
        boolean success = file.delete();
    } 
    catch (IOException e)    {    }

// Java example code to read text from a file.
    try 
    {
        BufferedReader infile = new BufferedReader(new FileReader("path and file_name "));
        String str;
        while ((str = in.readLine()) != null) 
        {
            process(str);
        }
        infile.close();
    } 
    catch (IOException e) 
    {
        // Exceptions ignored.
    }

// Java example code to writing to a file.
    try 
    {
        BufferedWriter outfile = 
          new BufferedWriter(new FileWriter("path and file_name "));
        outfile.write("a string");
        outfile.close();
    }
    catch (IOException e)    {    }

// sample C# code for basic file I/O operations
// exceptions ignored for code simplicity

class TestFileIO
{
    static void Main() 
    {
        string fileName = "test.txt";  // a sample file name

        // Delete the file if it exists.
        if (System.IO.File.Exists(fileName))
        {
            System.IO.File.Delete(fileName);
        }

        // Create the file.
        using (System.IO.FileStream fs = System.IO.File.Create(fileName, 1024)) 
        {
            // Add some information to the file.
            byte[] info = new System.Text.UTF8Encoding(true).GetBytes("This is some text in the file.");
            fs.Write(info, 0, info.Length);
        }

        // Open the file and read it back.
        using (System.IO.StreamReader sr = System.IO.File.OpenText(fileName)) 
        {
            string s = "";
            while ((s = sr.ReadLine()) != null) 
            {
                System.Console.WriteLine(s);
            }
        }
    }
}