int int1 = 128;
try {
   byte value1 = (byte) int1;
   Console.WriteLine(value1);
}
catch (OverflowException) {
   Console.WriteLine("{0} is out of range of a byte.", int1);
}

double dbl2 = 3.997;
try {
   byte value2 = (byte) dbl2;
   Console.WriteLine(value2);
}
catch (OverflowException) {
   Console.WriteLine("{0} is out of range of a byte.", dbl2);
}

int[] numbers = { Int32.MinValue, -1, 0, 121, 340, Int32.MaxValue };
byte result;
foreach (int number in numbers)
{
   try {
      result = Convert.ToByte(number);
      Console.WriteLine("Converted the {0} value {1} to the {2} value {3}.", 
                        number.GetType().Name, number, 
                        result.GetType().Name, result);
   }                     
   catch (OverflowException) {
      Console.WriteLine("The {0} value {1} is outside the range of the Byte type.", 
                        number.GetType().Name, number);
   }
}

string string1 = "244";
   try {
      byte byte1 = Byte.Parse(string1);
      Console.WriteLine(byte1);
   }
   catch (OverflowException) {
      Console.WriteLine("'{0}' is out of range of a byte.", string1);
   }
   catch (FormatException) {
      Console.WriteLine("'{0}' is out of range of a byte.", string1);
   }

   string string2 = "F9";
   try {
      byte byte2 = Byte.Parse(string2, 
                              System.Globalization.NumberStyles.HexNumber);
      Console.WriteLine(byte2);
   }
   catch (OverflowException) {
      Console.WriteLine("'{0}' is out of range of a byte.", string2);
   }
   catch (FormatException) {
      Console.WriteLine("'{0}' is out of range of a byte.", string2);
   }
   // The example displays the following output:
   //       244
   //       249

byte[] numbers = { 0, 16, 104, 213 };
foreach (byte number in numbers) {
   // Display value using default formatting.
   Console.Write("{0,-3}  -->   ", number.ToString());
   // Display value with 3 digits and leading zeros.
   Console.Write(number.ToString("D3") + "   ");
   // Display value with hexadecimal.
   Console.Write(number.ToString("X2") + "   ");
   // Display value with four hexadecimal digits.
   Console.WriteLine(number.ToString("X4"));
}

byte[] numbers ={ 0, 16, 104, 213 };
Console.WriteLine("{0}   {1,8}   {2,5}   {3,5}",
                  "Value", "Binary", "Octal", "Hex");
foreach (byte number in numbers) {
   Console.WriteLine("{0,5}   {1,8}   {2,5}   {3,5}",
                     number, Convert.ToString(number, 2),
                     Convert.ToString(number, 8),
                     Convert.ToString(number, 16));
}

//引入命名空间
using System;
using System.Globalization;

public class Example
{
   public static void Main()
   {
      string[] values = { Convert.ToString(12, 16), 
                          Convert.ToString(123, 16), 
                          Convert.ToString(245, 16) };
      
      byte mask = 0xFE;
      foreach (string value in values) {
         Byte byteValue = Byte.Parse(value, NumberStyles.AllowHexSpecifier);
         Console.WriteLine("{0} And {1} = {2}", byteValue, mask,  
                           byteValue & mask);
      }
   }
}

//引入命名空间
using System;
using System.Collections.Generic;
using System.Globalization;

public struct ByteString
{
   public string Value;
   public int Sign;
}

public class Example
{
   public static void Main()
   {
      ByteString[] values = CreateArray(-15, 123, 245);
      
      byte mask = 0x14;        // Mask all bits but 2 and 4.
      
      foreach (ByteString strValue in values) {
         byte byteValue = Byte.Parse(strValue.Value, NumberStyles.AllowHexSpecifier);
         Console.WriteLine("{0} ({1}) And {2} ({3}) = {4} ({5})", 
                           strValue.Sign * byteValue, 
                           Convert.ToString(byteValue, 2), 
                           mask, Convert.ToString(mask, 2), 
                           (strValue.Sign & Math.Sign(mask)) * (byteValue & mask), 
                           Convert.ToString(byteValue & mask, 2));
      }
   }
   
   private static ByteString[] CreateArray(params int[] values)
   {
      List<ByteString> byteStrings = new List<ByteString>();

      foreach (object value in values) {
         ByteString temp = new ByteString();
         int sign = Math.Sign((int) value);
         temp.Sign = sign;

         // Change two's complement to magnitude-only representation.
         temp.Value = Convert.ToString(((int) value) * sign, 16);

         byteStrings.Add(temp);
      }
      return byteStrings.ToArray();
   }
}