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CHAPTER 16 STRINGS AND CHARACTERS
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Concat: IntroductiontoC# Insert: Introduction to C# Join: Introduction to C# Pad: Introduction to C#Remove: Introduction Replace: Intr0ducti0n Element: Introduction Element: to Element: C# Upper: INTRODUCTION TO C# Lower: introduction to c# Press enter to finish
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Searching Strings
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The string class defines several methods to search strings. These are in addition to the support for regular expressions that was described earlier in this chapter. Table 16-5 describes the most commonly used search methods in the string class. Table 16-5. Members of the System.String Class for Searching Strings
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Method
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Contains(string)
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Description
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Returns true if the current string contains the substring specified by the parameter and false otherwise. Returns true if the current string starts with or ends with the string specified by the parameter and false otherwise. Returns the index of the first occurrence of the character or substring in the current string specified by the parameter. Overridden versions of this method allow you to specify a start index for the search. Returns -1 if no match is found. Returns the index of the last occurrence of the character or substring in the current string specified by the parameter. Returns -1 if no match is found. Returns the first or last index of any individual character in the array of characters specified in the parameter. Returns -1 if no match is found.
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StartsWith(string) EndsWith(string) IndexOf(char) IndexOf(string)
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LastIndexOf(char) LastIndexOf(string)
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IndexOfAny(char[]) LastIndexOfAny(char[])
Listing 16-15 demonstrates the use of some of the methods described in Table 16-5.
CHAPTER 16 STRINGS AND CHARACTERS
Listing 16-15. Searching Strings using System; class Listing 15 { static void Main(string[] args) { // define a string to work with string myString = "Introduction to C#"; // use the Contains method bool contains = myString.Contains("duct"); Console.WriteLine("Contains: {0}", contains); // use the StartsWith and EndsWith methods bool startsWith = myString.StartsWith("Intro"); bool endsWith = myString.EndsWith("Intro"); Console.WriteLine("StartsWith: {0}", startsWith); Console.WriteLine("EndsWith: {0}", endsWith); // use the IndexOf and LastIndexOf methods int indexOf = myString.IndexOf('o'); int lastIndexOf = myString.LastIndexOf('o'); Console.WriteLine("IndexOf: {0}", indexOf); Console.WriteLine("LastIndexOf: {0}", lastIndexOf); // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } Compiling and running the code in Listing 16-15 produces the following results: Contains: True StartsWith: True EndsWith: False IndexOf: 4 LastIndexOf: 14 Press enter to finish
Other Class Members
Two other members of the string class are worth mentioning but do not fit into the manipulating or searching strings categories. They are described in Table 16-6.
CHAPTER 16 STRINGS AND CHARACTERS
Table 16-6. Other Members of the System.String Class
Method
Length ToCharArray()
Description
This property returns the number of characters in the current string. This property copies the contents of the current string to a char array.
Listing 16-16 demonstrates the use of these two members. Listing 16-16. Using the Length and ToCharArray Members using System; class Listing 16 { static void Main(string[] args) { // define a string using a literal string myString = "Hello World"; // get the length of the string int len = myString.Length; Console.WriteLine("Length: {0}", len); // get the characters from the string char[] charArray = myString.ToCharArray(); // enumerate the character array foreach (char c in charArray) { Console.WriteLine("Char: {0}", c); } // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } Compiling and running the code in Listing 16-16 produces the following results: Length: 11 Char: H Char: e Char: l Char: l Char: o Char: Char: W Char: o
CHAPTER 16 STRINGS AND CHARACTERS
Char: Char: Char: Press
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Using the StringBuilder Class
The StringBuilder class, contained in the System.Text namespace, is the mutable companion to the read-only string class. You can edit the contents of a string represented by a StringBuilder object and perform operations that are faster and more efficient than working with strings directly. The main use of the StringBuilder class is to build strings through multiple append operations.
Creating a StringBuilder Object
There is no equivalent to the string literal to define StringBuilder values. You must instead use one of the class constructors, the simplest of which has no parameters, like this:
StringBuilder myBuilder = new StringBuilder();
A StringBuilder object uses a char array to store the characters of the string it represents. This array will be resized as needed to accommodate the effect of building a string by adding characters. You can recommend an initial size of array for a StringBuilder object to allocate by providing an int constructor parameter, like this:
StringBuilder myBuilder = new StringBuilder(10);
Suggesting an array capacity that is large enough to hold the string you intend to build can avoid the time-consuming operation of creating a larger array and copying the contents of the StringBuilder to it. If you already have the foundation for the string that you want to build, you can provide this as the basis of the StringBuilder, like this:
StringBuilder myBuilder = new StringBuilder("Introduction to");
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