barcode printing using c#.net Exploring the System Namespace in C#

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Exploring the System Namespace
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public int a; public X(int x) { a = x; } } class Test : ICloneable { public X o; public int b; public Test(int x, int y) { o = new X(x); b = y; } public void Show(string name) { ConsoleWrite(name + " values are "); ConsoleWriteLine("oa: {0}, b: {1}", oa, b); } // Make a deep copy of the invoking object public object Clone() { Test temp = new Test(oa, b); return temp; } } class CloneDemo { static void Main() { Test ob1 = new Test(10, 20); ob1Show("ob1"); ConsoleWriteLine("Make ob2 a clone of ob1"); Test ob2 = (Test) ob1Clone(); ob2Show("ob2"); ConsoleWriteLine("Changing ob1oa to 99 and ob1b to 88"); ob1oa = 99; ob1b = 88; ob1Show("ob1"); ob2Show("ob2"); } }
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PART II
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The output is shown here:
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ob1 values are oa: Make ob2 a clone of ob2 values are oa: Changing ob1oa to ob1 values are oa: ob2 values are oa: 10, b: ob1 10, b: 99 and 99, b: 10, b: 20 20 ob1b to 88 88 20
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Part II:
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Exploring the C# Library
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As the output shows, ob2 is a clone of ob1, but ob1 and ob2 are completely separate objects Changing one does not affect the other This is accomplished by constructing a new Test object, which allocates a new X object for the copy The new X instance is given the same value as the X object in the original To implement a shallow copy, simply have Clone( ) call MemberwiseClone( ) defined by Object For example, try changing Clone( ) in the preceding program as shown here:
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// Make a shallow copy of the invoking object public object Clone() { Test temp = (Test) MemberwiseClone(); return temp; }
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After making this change, the output of the program will look like this:
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ob1 values are oa: Make ob2 a clone of ob2 values are oa: Changing ob1oa to ob1 values are oa: ob2 values are oa: 10, b: ob1 10, b: 99 and 99, b: 99, b: 20 20 ob1b to 88 88 20
Notice that o in ob1 and o in ob2 both refer to the same X object Changing one affects both Of course, the int field b in each is still separate because the value types are not accessed via references
IFormatProvider and IFormattable
The IFormatProvider interface defines one method called GetFormat( ), which returns an object that controls the formatting of data into a human-readable string The general form of GetFormat( ) is shown here: object GetFormat(Type fmt) Here, fmt specifies the format object to obtain The IFormattable interface supports the formatting of human-readable output IFormattable defines this method: string ToString(string fmt, IFormatProvider fmtpvdr) Here, fmt specifies formatting instructions and fmtpvdr specifies the format provider
NOTE Formatting is described in detail in 22
CHAPTER
Strings and Formatting
his chapter examines the String class, which underlies C# s string type As all programmers know, string handling is a part of almost any program For this reason, the String class defines an extensive set of methods, properties, and fields that give you detailed control over the construction and manipulation of strings Closely related to string handling is the formatting of data into its human-readable form Using the formatting subsystem, you can format the C# numeric types, date and time, and enumerations
Strings in C#
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 Because 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:
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