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CHAPTER 26 OTHER USEFUL FEATURES AND CLASSES
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Console.WindowWidth = originalWidth; Console.Title = originalTitle; // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } Figure 26-2 shows the result of compiling and running Listing 26-9.
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Figure 26-2. A modified command window
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The System.Random class can be used to generate pseudorandom numbers. These are suitable for use in everyday programming but should not be used for cryptographic operations; see 37 for details of generating secure random numbers. Listing 26-10 demonstrates using the Random class to generate a sequence of numbers. Listing 26-10. Generating Random Numbers using System; class Listing 10 { static void Main(string[] args) { // create a new Random object Random myRNG = new Random(); for (int i = 0; i < 5; i++) { Console.WriteLine("Value: {0}", myRNG.Next(100)); }
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CHAPTER 26 OTHER USEFUL FEATURES AND CLASSES
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// wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } The Random class has a number of methods that you can use to get random numbers in different formats. These methods are described in Table 26-5. Table 26-5. System.Random Methods
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Method
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Next() Next(int) Next(int, int) NextBytes(byte[]) NextDouble()
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Description
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Returns an int value between 0 and int.MaxValue Returns an int value between 0 and the specified value Returns an int value between the two specified values Fills the byte array parameter with random values Returns a double value between 0 and 1.0
Compiling and running Listing 26-10 produces the following output; obviously the results differ each time the program is run: Value: 73 Value: 12 Value: 13 Value: 86 Value: 64 Press enter to finish
Converting Strings to and from Bytes
The System.Text.Encoding class is very useful for converting strings to bytes and back again. Listing 2611 provides a simple demonstration. Listing 26-11. Converting a String to Bytes and Back Again using System; using System.Text; class Listing 11 { static void Main(string[] args) {
CHAPTER 26 OTHER USEFUL FEATURES AND CLASSES
// get the bytes from the string byte[] myBytes = Encoding.ASCII.GetBytes("Hello World"); // get the string from the bytes string myString = Encoding.ASCII.GetString(myBytes); Console.WriteLine("String value: {0}", myString); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } The Encoding class provides access to a range of text encoding styles. I used ASCII encoding by calling the ASCII property in Listing 26-11 (although there are other encodings available through other Encoding properties). Once you have selected an encoding, the GetBytes method will return the bytes contained in a string, and the GetString will convert the bytes back into a string value. Compiling and running Listing 26-11 produces the following results: String value: Hello World Press enter to finish
Getting Environment Information
The System.Environment class contains members that provide access to the environment in which your program is running. Table 26-6 describes some of the most useful of these members. Table 26-6. Selected Members of the Environment Class
Member
CurrentDirectory Exit(int)
Description
Gets or sets the current working directory for the program Terminates this program and gives the specified exit code to the operating system Returns a string array containing the command-line arguments used to start the current program Returns the value for a specified environment variable Returns an IDictionary containing all the environment variables
GetCommandLineArgs()
GetEnvironmentVariable(string) GetEnvironmentVariables()
CHAPTER 26 OTHER USEFUL FEATURES AND CLASSES
Member
Is64BitOperatingSystem
Description
Returns true if the program is running on a 64-bit version of Windows Returns true if the current program is a 64-bit program Returns the name of the computer that the program is running on Returns details of the operating system version the program is running on Returns the number of processors in the computer that the program is running on Returns the name of the user account under which the program is running Sets the environment variable specified by the first parameter to the value specified by the second parameter Returns details of the version of the .NET runtime that the program is running on
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