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An overview of C# s string handling was presented in 7, and that discussion is not repeated here However, it is worthwhile to review how strings are implemented in C# before examining the String class In all computer languages, a string is a sequence of characters, but precisely how such a sequence is implemented varies from language to language In some computer languages, such as C++, strings are arrays of characters, but this is not the case with C# Instead, C# strings are objects of the built-in string data type Thus, string is a reference type Moreover, string is C# s name for SystemString, the standard NET string type Thus, a C# string has access to all of the methods, properties, fields, and operators defined by String Once a string has been created, the character sequence that comprises a string cannot be altered This restriction allows C# to implement strings more efficiently Though this restriction probably sounds like a serious drawback, it isn t When you need a string that is a variation on one that already exists, simply create a new string that contains the desired changes, and discard the original string if it is no longer needed Since unused string objects are automatically garbage-collected, you don t need to worry about what happens to the discarded strings It must be made clear, however, that string reference variables may, of course, change the object to which they refer It is just that the character sequence of a specific string object cannot be changed after it is created To create a string that can be changed, C# offers a class called StringBuilder, which is in the SystemText namespace For most purposes, however, you will want to use string, not StringBuilder

Part II:

1 +1

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 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:.

string str = "a new string";

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