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Exploring the C# Library
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The String Class
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String is defined in the System namespace It implements the IComparable, IComparable<string>, ICloneable, IConvertible, IEnumerable, IEnumerable<char>, and IEquatable<string> interfaces String is a sealed class, which means that it cannot be inherited String provides string-handling functionality for C# It underlies C# s built-in string type and is part of the NET Framework The next few sections examine String in detail
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The String Constructors
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The String class defines several constructors that allow you to construct a string in a variety of ways To create a string from a character array, use one of these constructors: public String(char[ ] value) public String(char[ ] value, int startIndex, int length) The first form constructs a string that contains the characters in value The second form uses length characters from value, beginning at the index specified by startIndex You can create a string that contains a specific character repeated a number of times using this constructor: public String(char c, int count) Here, c specifies the character that will be repeated count times You can construct a string given a pointer to a character array using one of these constructors: public String(char* value) public String(char* value, int startIndex, int length) The first form constructs a string that contains the characters pointed to by value It is assumed that value points to a null-terminated array, which is used in its entirety The second form uses length characters from the array pointed to by value, beginning at the index specified by startIndex Because they use pointers, these constructors can be used only in unsafe code You can construct a string given a pointer to an array of bytes using one of these constructors: public String(sbyte* value) public String(sbyte* value, int startIndex, int length) public String(sbyte* value, int startIndex, int length, Encoding enc) The first form constructs a string that contains the bytes pointed to by value It is assumed that value points to a null-terminated array, which is used in its entirety The second form uses length characters from the array pointed to by value, beginning at the index specified by startIndex The third form lets you specify how the bytes are encoded The Encoding class is in the SystemText namespace Because they use pointers, these constructors can be used only in unsafe code A string literal automatically creates a string object For this reason, a string object is often initialized by assigning it a string literal, as shown here:
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string str = "a new string";
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22:
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Strings and Formatting
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The String Field, Indexer, and Property
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The String class defines one field, shown here: public static readonly string Empty Empty specifies an empty string, which is a string that contains no characters This differs from a null String reference, which simply refers to no object There is one read-only indexer defined for String, which is shown here: public char this[int index] { get; } This indexer allows you to obtain the character at a specified index Like arrays, the indexing for strings begins at zero Since String objects are immutable, it makes sense that String supports a read-only indexer There is one read-only property: public int Length { get; } Length returns the number of characters in the string
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PART II
The String Operators
The String class overloads two operators: = = and != To test two strings for equality, use the = = operator Normally, when the = = operator is applied to object references, it determines if both references refer to the same object This differs for objects of type String When the = = is applied to two String references, the contents of the strings, themselves, are compared for equality The same is true for the != operator: the contents of the strings are compared However, the other relational operators, such as < or >=, compare the references, just like they do for other types of objects To determine if one string is greater than or less than another, use the Compare( ) or CompareTo( ) method defined by String As you will see, many string comparisons make use of cultural information This is not the case with the = = and != operators They simply compare the ordinal values of the characters within the strings (In other words, they compare the binary values of the characters, unmodified by cultural norms) Thus, these operators are case-sensitive and culture-insensitive
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