Copying an Array in Visual C#

Generating PDF 417 in Visual C# Copying an Array

If you use the assignment operator with arrays, you ll create another reference to the same array. In other words, the assignment operator is a shallow copy, just as you saw with String. If you want a deep copy, you need to use the static Array::Copy method. Listing 5-30 shows how. Listing 5-30. Making Copies of an Array // arrays_copy.cpp using namespace System; int main() { array<int>^ array1 = { 0, 1, 2};

// Shallow copy creates another name for the array. array<int>^ array2 = array1; array2[0] = 100; // This prints "100" since array2 is a synonym of array1. Console::WriteLine( "{0}", array1[0] ); array<int>^ array3 = gcnew array<int>(3); Array::Copy(array1, array3, array1->Length); // Change a value in the new copy of the array. array3[0] = 200; // This prints "100 1 2" since the old array was not affected. Console::WriteLine( "{0} {1} {2}", array1[0], array1[1], array1[2]); } Here is the output of Listing 5-30: 100 100 1 2

A managed array is actually an instance of the class System::Array. System::Array inherits from System::Object and implements IList. All managed arrays have the members shown in Tables 5-2 and 5-3.

Returns the number of elements in all the dimensions of the array Returns lengths greater than the maximum 32-bit integer, 231 1 Returns the number of dimensions in the array Returns an object which can be used for thread synchronization

AsReadOnly BinarySearch (various overloads) Clear Clone ConstrainedCopy generic ConvertAll Copy CopyTo CreateInstance Equals

Returns a read-only IList generic wrapper class, ReadOnlyCollection<T>, for the array. Locates an element in a sorted 1D array. Sets elements of an array to 0, NULL, or false, depending on the element type. Creates a shallow copy of the array.

Copies a range of elements in an array, and undoes changes if the copy fails. Returns a new array with every element converted to a new type. Creates a deep copy of the array. Copies elements from one 1D array to another 1D array or another position in the array.

Creates an array with specified rank and size. Tests for equality (inherited from Object). Tests reference equality, not whether elements are equal.

generic Exists generic Find generic FindAll generic FindIndex generic FindLast generic FindLastIndex generic ForEach GetEnumerator GetHashCode GetLength GetLongLength

generic, static generic, static generic, static generic, static generic, static generic, static generic, static

Returns true if an array contains an element that meets the specified criteria. Returns the first element in an array that matches the specified criteria. Returns all the elements in an array that match the specified criteria. Like Find, but returns the index of the element, not the element itself. Like Find, but returns the last element matching the criteria. Like FindLast, but returns the index, not the element. Executes a specified action on each element of an array. Returns an enumerator for iterating over the array. Returns hash code. Inherited from Object. Returns the length of the specified dimension of the array. Like GetLength, but supports lengths up to 263 1.

Returns the starting index if the array starts at an index other than zero. Gets a Type object for this type (inherited from Object). Gets the last index of the array. Gets the value of an element.

Gets the index of the first occurrence of an element in a 1D array, starting from a specified index. For value type arrays, initializes the array by calling the default constructor of that value type.

Like IndexOf, but searches from the end of the array or specified index. Changes the size of the array. Reverses the order of a 1D array (or portion of the array). Sets an element to the specified value.