barcode printing using c#.net A Sampling of Methods De ned by List<T> in Visual C#

Printing QR in Visual C# A Sampling of Methods De ned by List<T>

A Sampling of Methods De ned by List<T>
QR Code Generation In Visual C#
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25:
Bar Code Generation In Visual C#
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Collections, Enumerators, and Iterators
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Method public void Sort(int index, int count, IComparer<T> comparer) public T[ ] ToArray( ) public void TrimExcess( )
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Description Sorts a portion of the collection using the specified comparison object The sort begins at index and runs for count elements If comparer is null, the default comparer for each object is used Returns an array that contains copies of the elements of the invoking object Reduces the capacity of the invoking list so that it is no more than 10 percent greater than the number of elements that it currently holds
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PART II
Creating Code 128C In Visual C#
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TABLE 25-15
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EAN-13 Supplement 5 Maker In None
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A Sampling of Methods De ned by List<T> (continued)
Create GTIN - 12 In None
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Creating USS Code 39 In Java
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In addition to the properties defined by the interfaces that it implements, List<T> adds Capacity, shown here: public int Capacity { get; set; } Capacity gets or sets the capacity of the invoking list The capacity is the number of elements that can be held before the list must be enlarged Because a list grows automatically, it is not necessary to set the capacity manually However, for efficiency reasons, you might want to set the capacity when you know in advance how many elements the list will contain This prevents the overhead associated with the allocation of more memory The following indexer, defined by IList<T>, is implemented by List<T>, as shown here: public T this[int index] { get; set; } It sets or gets the value of the element at the index specified by index Here is a program that demonstrates List<T> It reworks the first ArrayList program shown earlier in this chapter The only changes necessary are to substitute the name List for ArrayList and to use the generic type parameters
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Code 128 Printer In None
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// Demonstrate List<T> using System; using SystemCollectionsGeneric; class GenListDemo { static void Main() { // Create a list List<char> lst = new List<char>(); ConsoleWriteLine("Initial number of elements: " + lstCount); ConsoleWriteLine(); ConsoleWriteLine("Adding 6 elements"); // Add elements to the array list lstAdd('C'); lstAdd('A');
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Part II:
Exploring the C# Library
lstAdd('E'); lstAdd('B'); lstAdd('D'); lstAdd('F'); ConsoleWriteLine("Number of elements: " + lstCount); // Display the list using array indexing ConsoleWrite("Current contents: "); for(int i=0; i < lstCount; i++) ConsoleWrite(lst[i] + " "); ConsoleWriteLine("\n"); ConsoleWriteLine("Removing 2 elements"); // Remove elements from the list lstRemove('F'); lstRemove('A'); ConsoleWriteLine("Number of elements: " + lstCount); // Use foreach loop to display the list ConsoleWrite("Contents: "); foreach(char c in lst) ConsoleWrite(c + " "); ConsoleWriteLine("\n"); ConsoleWriteLine("Adding 20 more elements"); // Add enough elements to force lst to grow for(int i=0; i < 20; i++) lstAdd((char)('a' + i)); ConsoleWriteLine("Current capacity: " + lstCapacity); ConsoleWriteLine("Number of elements after adding 20: " + lstCount); ConsoleWrite("Contents: "); foreach(char c in lst) ConsoleWrite(c + " "); ConsoleWriteLine("\n"); // Change contents using array indexing ConsoleWriteLine("Change first three elements"); lst[0] = 'X'; lst[1] = 'Y'; lst[2] = 'Z'; ConsoleWrite("Contents: "); foreach(char c in lst) ConsoleWrite(c + " "); ConsoleWriteLine();
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Collections, Enumerators, and Iterators
// } }
// Because of generic type-safety, // the following line is illegal lstAdd(99); // Error, not a char!
The output, shown here, is the same as that produced by the non-generic version of the program:
Initial number of elements: 0 Adding 6 elements Number of elements: 6 Current contents: C A E B D F Removing 2 elements Number of elements: 4 Contents: C E B D Adding 20 more elements Current capacity: 32 Number of elements after adding 20: 24 Contents: C E B D a b c d e f g h i j k l m n o p q r s t Change first three elements Contents: X Y Z D a b c d e f g h i j k l m n o p q r s t
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