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This article is about how VB.NET uses arrays. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

There is an important part of VB.NET, and that is the application of arrays. In actual programming, it is usually an important part of a code program. In addition to using a single variable, the application of the VB.NET array can easily store a series of related data. The array is divided into one-dimensional array and multi-dimensional array. An one-dimensional array is defined as follows:

Dim arrData (2) as String

This Dim statement defines an one-dimensional array arrData of length 3. Its subscript ranges from 0 to 2, that is, arrData (0), arrData (1), arrData (2) can be accessed, and all the data in the array is of type String.

A multidimensional array is an array with a dimension greater than 1. The most common are two-dimensional and three-dimensional arrays. A two-dimensional array is defined as follows:

Dim arrData (2p3) as String

This Dim statement defines a 3 × 4 array of 12 units. Like an one-dimensional array, its subscript ranges from 0 to 2 and the second from 0 to 3. And so on, you can define three-dimensional arrays or arrays with more dimensions. In VB.NET, the dimension of an array can be defined up to 60, but few people will use an array with more than three dimensions.

Dynamic arrays, that is, arrays of uncertain length, can also be defined in the VB.NET array. For example, you can define a dynamic array at the beginning of the program:

Dim arrData ()

Here, the length of the array arrData is not specified, and its dimension is not known, so this array cannot be used directly in the program. Because all arrays need continuous memory space to store, if the dimension of the array and the length of each dimension are not defined, it means that the memory space cannot be allocated for the array. So VB.NET requires you to specify the dimension and the length of each dimension for the dynamic array with a ReDimt statement before using it. The methods are as follows:

ReDim arrData (2)

At this point, you can use the arrData array. Note that if an array is not defined as a dynamic array, you cannot use the VB.NET statement to redefine the array. In addition, for dynamic arrays that have been redefined using ReDim, you can redefine the length of the array using ReDim, but you cannot use ReDim to redefine the dimension of the array. That is, if you have defined a dynamic array arrData (), you can redefine it as an one-dimensional array (such as ReDim arrData (2)) in a later program, rather than as a two-dimensional array (such as ReDim arrData (2) 3), but you can redefine it as an one-dimensional array of length 5 (ReDim arrData (4)) again.

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