Stephens' C# Programming with Visual Studio® 2010 24-Hour Trainer

Working with Strings

Previous lessons provided a sneak peek at some of the things that a C# program can do with

strings. Lesson 11 explained how you can use the

+ operator to concatenate two strings. Several

lessons show how to use the

ToString method to convert numeric values into strings that you

can then display to the user.

In this lesson, you learn a lot more about strings. You learn about

string class methods that

let you search strings, replace parts of strings, and extract pieces of strings. You also learn new

ways to format numeric and other kinds of data to produce strings.

STRING METHODS

The string class provides a lot of useful methods for manipulating strings. For example, the

EndsWith method returns true if a string ends with a particular substring. The following

code determines whether a string ends with the substring

dog:

string str = “The quick brown fox jumps over the lazy dog.”;

MessageBox.Show(“Ends with \“dog.\“: “ + str.EndsWith(“dog.”));

Table 14-1 summarizes the string class’s most useful methods.

TABLE 141

METHOD PURPOSE

Contains

Returns true if the string contains a target string.

EndsWith

Returns true if the string ends with a target string.

IndexOf

Returns the index of a target character or string within the string.

IndexOfAny

Returns the index of the first occurrence of any of a set of characters in

the string.

Insert

Inserts text in the middle of the string.

14

continues ...