Using I/O in Visual C#.NET

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Using I/O
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Structure Decimal Double Single Int64 Int32 Int16 UInt64 UInt32 UInt16 Byte SByte
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Conversion Method static decimal Parse(string str)
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static double Parse(string str) static float Parse(string str) static long Parse(string str) static int Parse(string str) static short Parse(string str) static ulong Parse(string str) static uint Parse(string str) static ushort Parse(string str) static byte Parse(string str) static sbyte Parse(string str)
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The Parse( ) methods will throw a FormatException if str does not contain a valid number as defined by the invoking type ArgumentNullException is thrown if str is null, and OverflowException is thrown if the value in str exceeds the bounds of the invoking type The parsing methods give you an easy way to convert a numeric value, read as a string from the keyboard or a text file, into its proper internal format For example, the following program averages a list of numbers entered by the user It first asks the user for the number of values to be averaged It then reads that number using ReadLine( ) and uses Int32Parse( ) to convert the string into an integer Next, it inputs the values, using DoubleParse( ) to convert the strings into their double equivalents
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// This program averages a list of numbers entered by the user using System; using SystemIO; class AvgNums { static void Main() { string str; int n; double sum = 00; double avg, t; ConsoleWrite("How many numbers will you enter: "); str = ConsoleReadLine(); try { n = Int32Parse(str); } catch(FormatException exc) { ConsoleWriteLine(excMessage); return; } catch(OverflowException exc) { ConsoleWriteLine(excMessage); return; }
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Part I:
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The C# Language
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ConsoleWriteLine("Enter " + n + " values"); for(int i=0; i < n ; i++) { ConsoleWrite(": "); str = ConsoleReadLine(); try { t = DoubleParse(str); } catch(FormatException exc) { ConsoleWriteLine(excMessage); t = 00; } catch(OverflowException exc) { ConsoleWriteLine(excMessage); t = 0; } sum += t; } avg = sum / n; ConsoleWriteLine("Average is " + avg); } }
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Here is a sample run:
How many numbers will you enter: 5 Enter 5 values : 11 : 22 : 33 : 44 : 55 Average is 33
One other point: You must use the right parsing method for the type of value you are trying to convert For example, trying to use Int32Parse( ) on a string that contains a floating-point value will not produce the desired result As explained, Parse( ) will throw an exception on failure You can avoid generating an exception when converting numeric strings by using the TryParse( ) method, which is defined for all of the numeric structures Here is an example It shows one version of TryParse( ) as defined by Int32 static bool TryParse(string str, out int result) The numeric string is passed in str The result is returned in result It performs the conversion using the default locale and numeric style (A second version of TryParse( ) is available that lets you specify the numeric style and locale) If the conversion fails, such as when str does not contain a numeric string in the proper form, TryParse( ) returns false Otherwise, it returns true Therefore, you must check the return value to confirm that a successful conversion has occurred
CHAPTER
Delegates, Events, and Lambda Expressions
his chapter examines three innovative C# features: delegates, events, and lambda expressions A delegate provides a way to encapsulate a method An event is a notification that some action has occurred Delegates and events are related because an event is built upon a delegate Both expand the set of programming tasks to which C# can be applied The lambda expression is a new syntactic feature provided by C# 30 It offers a streamlined, yet powerful way to define what is, essentially, a unit of executable code Lambda expressions are often used when working with delegates and events because a delegate can refer to a lambda expression (Lambda expressions are also very important to LINQ, which is described in 19) Also examined are anonymous methods, covariance, contravariance, and method group conversions
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