. Net BASICS (4) -- Array

Array

Task	C #	VB
Create a 5-dimensional array with the default value as the initial value	Int [] ages = new int [5]; Console. WriteLine (ages. Length); // => 5 Console. WriteLine (ages. Rank); // => 1 Console. WriteLine (ages. GetLowerBound (0); // => 0 Console. WriteLine (ages. GetUpperBound (0); // => 4	Dim ages (4) As Integer Console. WriteLine (ages. Length) '=> 5 Console. WriteLine (ages. Rank) '=> 1 Console. WriteLine (ages. GetLowerBound (0) '=> 0 Console. WriteLine (ages. GetUpperBound (0) '=> 4
Create a 5-dimensional array and specify the Initial Value	Int [] ages = new int [5] {1, 3, 5, 7, 9}; // OK Int [] ages1 = new int [] {1, 3, 5, 7, 9}; // OK Int [] ages2 = new int [6] {1, 3, 5, 7, 9}; // compilation Error Console. WriteLine (ages. Length); // => 5 Console. WriteLine (ages. Rank); // => 1 Console. WriteLine (ages. GetLowerBound (0); // => 0 Console. WriteLine (ages. GetUpperBound (0); // => 4	Dim ages () As Integer = New Integer (4) {1, 3, 5, 7, 9} 'OK Dim ages1 () As Integer = New Integer () {1, 3, 5, 7, 9} 'OK Dim ages2 () As Integer = New Integer (5) {1, 3, 5, 7, 9} 'compilation Error Console. WriteLine (ages. Length) '=> 5 Console. WriteLine (ages. Rank) '=> 1 Console. WriteLine (ages. GetLowerBound (0) '=> 0 Console. WriteLine (ages. GetUpperBound (0) '=> 4
Create a two-row, three-column two-dimensional array with the default value as the initial value	Int [,] t = new int [2, 3]; Console. WriteLine (t. Length); // => 6 Console. WriteLine (t. Rank); // => 2 Console. WriteLine (t. GetLength (0); // => 2 Console. WriteLine (t. GetLowerBound (0); // => 0 Console. WriteLine (t. GetUpperBound (0); // => 1 Console. WriteLine (t. GetLowerBound (1); // => 0 Console. WriteLine (t. GetUpperBound (1); // => 2 Console. WriteLine (t. GetLength (1); // => 3	Dim t (1, 2) As Integer Console. WriteLine (t. Length) '=> 6 Console. WriteLine (t. Rank) '=> 2 Console. WriteLine (t. GetLength (0) '=> 2 Console. WriteLine (t. GetLowerBound (0) '=> 0 Console. WriteLine (t. GetUpperBound (0) '=> 1 Console. WriteLine (t. GetLowerBound (1) '=> 0 Console. WriteLine (t. GetUpperBound (1) '=> 2 Console. WriteLine (t. GetLength (1) '=> 3
Create a two-row, three-column two-dimensional array and specify the initial value.	Int [,] t = new int [2, 3] {1, 2, 3 }, {4, 5, 6 }}; Int [,] t1 = new int [,] {1, 2, 3 }, {4, 5, 6 }}; Console. WriteLine (t. Length); // => 6 Console. WriteLine (t. Rank); // => 2 Console. WriteLine (t. GetLength (0); // => 2 Console. WriteLine (t. GetLowerBound (0); // => 0 Console. WriteLine (t. GetUpperBound (0); // => 1 Console. WriteLine (t. GetLowerBound (1); // => 0 Console. WriteLine (t. GetUpperBound (1); // => 2 Console. WriteLine (t. GetLength (1); // => 3	Dim t (,) As Integer = New Integer (1, 2) {1, 2, 3 },_ {4, 5, 6 }} Dim t1 (,) As Integer = New Integer (,) {1, 2, 3 },_ {4, 5, 6 }} Console. WriteLine (t. Length) '=> 6 Console. WriteLine (t. Rank) '=> 2 Console. WriteLine (t. GetLength (0) '=> 2 Console. WriteLine (t. GetLowerBound (0) '=> 0 Console. WriteLine (t. GetUpperBound (0) '=> 1 Console. WriteLine (t. GetLowerBound (1) '=> 0 Console. WriteLine (t. GetUpperBound (1) '=> 2 Console. WriteLine (t. GetLength (1) '=> 3
Create a one-dimensional array with a length of 5 subscript of 1 and use the default value as the initial value.	Array t = Array. CreateInstance (typeof (string), new int [] {5}, new int [] {1 }); Console. WriteLine (t. Length); // => 5 Console. WriteLine (t. Rank); // => 1 Console. WriteLine (t. GetLength (0); // => 5 Console. WriteLine (t. GetLowerBound (0); // => 1 Console. WriteLine (t. GetUpperBound (0); // => 5	Dim t As Array = Array. CreateInstance (GetType (Integer), New Integer () {5}, New Integer () {1 }) Console. WriteLine (t. Length) '=> 5 Console. WriteLine (t. Rank) '=> 1 Console. WriteLine (t. GetLength (0) '=> 5 Console. WriteLine (t. GetLowerBound (0) '=> 1 Console. WriteLine (t. GetUpperBound (0) '=> 5
Create a two-dimensional array with two rows and three columns subscript of 1 and use the default value as the initial value.	Int [,] t = (int [,]) Array. CreateInstance (typeof (int), new int [] {2, 3}, new int [] {1, 1 }); Console. WriteLine (t. Length); // => 6 Console. WriteLine (t. Rank); // => 2 Console. WriteLine (t. GetLength (0); // => 2 Console. WriteLine (t. GetLowerBound (0); // => 1 Console. WriteLine (t. GetUpperBound (0); // => 2 Console. WriteLine (t. GetLowerBound (1); // => 1 Console. WriteLine (t. GetUpperBound (1); // => 3 Console. WriteLine (t. GetLength (1); // => 3	Dim t (,) As Integer = Array. CreateInstance (GetType (Integer), New Integer () {2, 3}, New Integer () {1, 1 }) Console. WriteLine (t. Length) '=> 6 Console. WriteLine (t. Rank) '=> 2 Console. WriteLine (t. GetLength (0) '=> 2 Console. WriteLine (t. GetLowerBound (0) '=> 1 Console. WriteLine (t. GetUpperBound (0) '=> 2 Console. WriteLine (t. GetLowerBound (1) '=> 1 Console. WriteLine (t. GetUpperBound (1) '=> 3 Console. WriteLine (t. GetLength (1) '=> 3
Change the array Length	Int [] t = new int [2]; Array. Resize (ref t, 3 ); Console. WriteLine (t. Length); // => 3 Console. WriteLine (t. Rank); // => 1 Console. WriteLine (t. GetLength (0); // => 3 Console. WriteLine (t. GetLowerBound (0); // => 0 Console. WriteLine (t. GetUpperBound (0); // => 2	Dim t (2) As Integer Array. Resize (t, 3) Console. WriteLine (t. Length) '=> 3 Console. WriteLine (t. Rank) '=> 1 Console. WriteLine (t. GetLength (0) '=> 3 Console. WriteLine (t. GetLowerBound (0) '=> 0 Console. WriteLine (t. GetUpperBound (0) '=> 2
Forced type conversion of referenced Array	String [] s = new string [3]; Object [] OS = s; S = (string []) OS;	Dim s (2) As String Dim OS () As Object = s S = OS
Forced type conversion of value type array (VS2005)	Int [] a = new int [2]; Decimal [] da1 = a; // compilation Error Decimal [] da2 = (int []) a; // compilation Error Decimal [] da = Array. ConvertAll (, New Converter ( Delegate (int old) { Return old; }); // OK	Dim a (2) As Integer Dim da () As Decimal = Array. ConvertAll (,_ New Converter (Of Integer, Decimal) (AddressOf ConvertInt )) ... Function ConvertInt (ByVal old As Integer) As Decimal Return old End Function
Forced type conversion of Value Type arrays (VS2008)	Int [] a = new int [2]; Decimal [] da = Array. ConvertAll (, New Converter (Old => old ));	Dim a (2) As Integer Dim da () As Decimal = Array. ConvertAll (Of Integer, Decimal) (,_ New Converter (Of Integer, Decimal) (Function (old ))
Create an interleaved array (an array)	Int [] [] a = new int [2] []; Console. WriteLine (a [0] = null); // => True	Dim a (2) () As Integer Console. WriteLine (a (0) Is Nothing) '=> True
Create an interleaved array and initialize it (Example 1)	Int [] [] a = new int [2] [] {new int [2], new int [3]}; Console. WriteLine (a [0]. Length); // => 2 Console. WriteLine (a [1]. Length); // => 3	Dim m (1) As Integer Dim n (2) As Integer Dim a () As Integer = New Integer (1) () {m, n} Console. WriteLine (a (0). Length) '=> 2 Console. WriteLine (a (1). Length) '=> 3
Create an interleaved array and initialize it (Example 2)	Int [] [] a = new int [2] [] {new int [2] {1, 2 }, New int [3] {11, 22, 33 }}; Console. WriteLine (a [0] [0]); // => 1 Console. WriteLine (a [1] [2]); // => 33	Dim m () As Integer = New Integer (1) {1, 2} Dim n () As Integer = New Integer (2) {11, 22, 33} Dim a () As Integer = New Integer (1) () {m, n} Console. WriteLine (a (0) (0) '=> 1 Console. WriteLine (a (1) (2) '=> 33