Write and read back binary data : BinaryWriter « File Directory Stream « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. File Directory Stream
3. BinaryWriter

using System; 
using System.IO;  
 
class MainClass { 
  public static void Main() { 
    BinaryWriter dataOut; 
    BinaryReader dataIn; 
 
    int i = 10; 
    double d = 1.56; 
    bool b = true; 
 
    try { 
      dataOut = new BinaryWriter(new FileStream("testdata", FileMode.Create)); 
    } 
    catch(IOException exc) { 
      Console.WriteLine(exc.Message + "\nCannot open file."); 
      return; 
    } 
 
    try { 
      Console.WriteLine("Writing " + i); 
      dataOut.Write(i);  
 
      Console.WriteLine("Writing " + d); 
      dataOut.Write(d); 
 
      Console.WriteLine("Writing " + b); 
      dataOut.Write(b); 
 
      Console.WriteLine("Writing " + 12.2 * 7.4); 
      dataOut.Write(12.2 * 7.4); 
 
    } 
    catch(IOException exc) { 
      Console.WriteLine(exc.Message + "\nWrite error."); 
    } 
 
    dataOut.Close(); 
 
    Console.WriteLine(); 
 
    try { 
      dataIn = new BinaryReader(new FileStream("testdata", FileMode.Open)); 
    } 
    catch(FileNotFoundException exc) { 
      Console.WriteLine(exc.Message + "\nCannot open file."); 
      return; 
    } 
 
    try { 
      i = dataIn.ReadInt32(); 
      Console.WriteLine("Reading " + i); 
 
      d = dataIn.ReadDouble(); 
      Console.WriteLine("Reading " + d); 
 
      b = dataIn.ReadBoolean(); 
      Console.WriteLine("Reading " + b); 
 
      d = dataIn.ReadDouble(); 
      Console.WriteLine("Reading " + d); 
    } 
    catch(IOException exc) { 
      Console.WriteLine(exc.Message + "Read error."); 
    } 
 
    dataIn.Close();  
  } 
}

Writing 10
Writing 1.56
Writing True
Writing 90.28

Reading 10
Reading 1.56
Reading True
Reading 90.28