qr code generator c# asp.net PART II in C#.NET

Encode QR-Code in C#.NET PART II

PART II
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On hand: {2}",
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Part II:
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Exploring the C# Library
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} } class IComparerDemo { static void Main() { CompInv comp = new CompInv(); ArrayList inv = new ArrayList(); // Add elements to the list invAdd(new Inventory("Pliers", 595, 3)); invAdd(new Inventory("Wrenches", 829, 2)); invAdd(new Inventory("Hammers", 350, 4)); invAdd(new Inventory("Drills", 1988, 8)); ConsoleWriteLine("Inventory list before sorting:"); foreach(Inventory i in inv) { ConsoleWriteLine(" " + i); } ConsoleWriteLine(); // Sort the list using an IComparer invSort(comp); ConsoleWriteLine("Inventory list after sorting:"); foreach(Inventory i in inv) { ConsoleWriteLine(" " + i); } } }
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The output is the same as the previous version of the program
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Using a Generic IComparer<T>
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The IComparer<T> interface is the generic version of IComparer It defines the generic version of Compare( ), shown here: int Compare(T x, T y) This method compares x with y and returns greater than zero if x is greater than y, zero if the two objects are the same, and less than zero if x is less that y Here is a generic version of the preceding program that uses IComparer<T> It produces the same output as the previous versions of the program
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// Use IComparer<T> using System; using SystemCollectionsGeneric; // Create an IComparer<T> for Inventory objects class CompInv<T> : IComparer<T> where T : Inventory { // Implement the IComparer<T> interface public int Compare(T x, T y) {
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Collections, Enumerators, and Iterators
return stringCompare(xname, yname, StringComparisonOrdinal); } } class Inventory { public string name; double cost; int onhand; public Inventory(string n, double c, int h) { name = n; cost = c; onhand = h; } public override string ToString() { return StringFormat("{0,-10}Cost: {1,6:C} name, cost, onhand); } } class GenericIComparerDemo { static void Main() { CompInv<Inventory> comp = new CompInv<Inventory>(); List<Inventory> inv = new List<Inventory>(); // Add elements to the list invAdd(new Inventory("Pliers", 595, 3)); invAdd(new Inventory("Wrenches", 829, 2)); invAdd(new Inventory("Hammers", 350, 4)); invAdd(new Inventory("Drills", 1988, 8)); ConsoleWriteLine("Inventory list before sorting:"); foreach(Inventory i in inv) { ConsoleWriteLine(" " + i); } ConsoleWriteLine(); // Sort the list using an IComparer invSort(comp); ConsoleWriteLine("Inventory list after sorting:"); foreach(Inventory i in inv) { ConsoleWriteLine(" " + i); } } }
PART II
On hand: {2}",
Using StringComparer
Although not necessary for the simple examples in this chapter, you may encounter situations when storing strings in a sorted collection, or when sorting or searching strings
Part II:
Exploring the C# Library
in a collection, in which you need to explicitly specify how those strings are compared For example, if strings will be sorted using one cultural setting and searched under another, then explicitly specifying the comparison method may be necessary to avoid errors A similar situation can exist when a collection uses hashing To handle these (and other) types of situations, several of the collection class constructors and methods support an IComparer parameter To explicitly specify the string comparison method, you will pass this parameter an instance of StringComparer StringComparer was described in 21, in the discussion of sorting and searching arrays It implements the IComparer, IComparer<String>, IEqualityComparer, and IEqualityComparer<String> interfaces Thus, an instance of StringComparer can be passed to an IComparer parameter as an argument StringComparer defines several read-only properties that return an instance of StringComparer that supports various types of string comparisons As described in 21, they are CurrentCulture, CurrentCultureIgnoreCase, InvariantCulture, InvariantCultureIgnoreCase, Ordinal, and OrdinalIgnoreCase You can use these properties to explicitly specify the comparison For example, here is how to construct a SortedList<TKey, TValue> for strings that use ordinal comparisons for their keys:
SortedList<string, int> users = new SortedList<string, int>(StringComparerOrdinal);
Accessing a Collection via an Enumerator
Often you will want to cycle through the elements in a collection For example, you might want to display each element One way to do this is to use a foreach loop, as the preceding examples have done Another way is to use an enumerator An enumerator is an object that implements either the non-generic IEnumerator or the generic IEnumerator<T> interface IEnumerator defines one property called Current The non-generic version is shown here: object Current { get; } For IEnumerator<T>, Current is declared like this: T Current { get; } In both cases, Current obtains the current element being enumerated Since Current is a read-only property, an enumerator can only be used to retrieve, but not modify, the objects in a collection IEnumerator defines two methods The first is MoveNext( ): bool MoveNext( ) Each call to MoveNext( ) moves the current position of the enumerator to the next element in the collection It returns true if the next element is available, or false if the end of the collection has been reached Prior to the first call to MoveNext( ), the value of Current is undefined (Conceptually, prior to the first call to MoveNext( ), the enumerator refers to the nonexistent element that is just before the first element Thus, you must call MoveNext( ) to move to the first element) You can reset the enumerator to the start of the collection by calling Reset( ), shown here: void Reset( )
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