qr code generator c# asp.net Several Commonly Used Methods De ned by ArrayList in Visual C#.NET

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Several Commonly Used Methods De ned by ArrayList
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Method public virtual int IndexOf(object value) public virtual void InsertRange(int index, ICollection c) public virtual int LastIndexOf(object value) public static ArrayList ReadOnly(ArrayList list) public virtual void RemoveRange(int index, int count) public virtual void Reverse( ) public virtual void Reverse(int index, int count) public virtual void SetRange(int index, ICollection c) public virtual void Sort( ) public virtual void Sort(IComparer comparer)
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Description Returns the index of the first occurrence of value in the invoking collection Returns 1 if value is not found Inserts the elements of c into the invoking collection, starting at the index specified by index Returns the index of the last occurrence of value in the invoking collection Returns 1 if value is not found Wraps list in a read-only ArrayList and returns the result Removes count elements from the invoking collection, beginning at index Reverses the contents of the invoking collection Reverses count elements of the invoking collection, beginning at index Replaces elements within the invoking collection, beginning at index, within those specified by c Sorts the collection into ascending order Sorts the collection using the specified comparison object If comparer is null, the default comparison for each object is used 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 comparison for each object is used Returns a synchronized version of the invoking ArrayList Returns an array that contains copies of the elements of the invoking object Returns an array that contains copies of the elements of the invoking object The type of the elements in the array is specified by type Sets Capacity to Count
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public virtual void Sort(int index, int count, IComparer comparer) public static ArrayList Synchronized(ArrayList list) public virtual object[ ] ToArray( ) public virtual Array ToArray(Type type)
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public virtual void TrimToSize( )
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Several Commonly Used Methods De ned by ArrayList (continued)
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In addition to those properties defined by the interfaces that it implements, ArrayList adds Capacity, shown here: public virtual int Capacity { get; set; } Capacity gets or sets the capacity of the invoking ArrayList The capacity is the number of elements that can be held before the ArrayList must be enlarged As mentioned, an ArrayList grows automatically, so 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
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25:
Collections, Enumerators, and Iterators
many elements the list will contain This prevents the overhead associated with the allocation of more memory Conversely, if you want to reduce the size of the array that underlies an ArrayList, you can set Capacity to a smaller value However, this value must not be less than Count Recall that Count is a property defined by ICollection that holds the number of objects currently stored in a collection Attempting to set Capacity to a value less than Count causes an ArgumentOutOfRangeException to be generated To obtain an ArrayList that is precisely as large as the number of items that it is currently holding, set Capacity equal to Count You can also call TrimToSize( ) The following program demonstrates ArrayList It creates an ArrayList and then adds characters to it The list is then displayed Some of the elements are removed, and the list is displayed again Next, more elements are added, forcing the capacity of the list to be increased Finally, the contents of elements are changed
// Demonstrate ArrayList using System; using SystemCollections; class ArrayListDemo { static void Main() { // Create an array list ArrayList al = new ArrayList(); ConsoleWriteLine("Initial number of elements: " + alCount); ConsoleWriteLine(); ConsoleWriteLine("Adding 6 elements"); // Add elements to the array list alAdd('C'); alAdd('A'); alAdd('E'); alAdd('B'); alAdd('D'); alAdd('F'); ConsoleWriteLine("Number of elements: " + alCount); // Display the array list using array indexing ConsoleWrite("Current contents: "); for(int i=0; i < alCount; i++) ConsoleWrite(al[i] + " "); ConsoleWriteLine("\n"); ConsoleWriteLine("Removing 2 elements"); // Remove elements from the array list alRemove('F'); alRemove('A');
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