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Joe Smith Jim Allen This list could be easily stored in a one-dimensional array with this code: VB .NET Dim Customers() As String = {"Joe Smith", "Jim Allen"} C# string[] Customers = { "Joe Smith", "Jim Allen" }; Now consider adding more information about the customers, such as the country they live in: Joe Smith, US Jim Allen, US This data would now need to be stored in a two-dimensional array, using the following code: VB .NET Dim Customers(,) As String = _ { {"Joe Smith", "US"}, {"Jim Allen", "US"} } C# string[,] Customers = { {"Joe Smith", "US"}, {"Jim Allen", "US"} }; Note that each set of names and countries are like a row of data in a spreadsheet. This analogy might be easier to see if you write out the code like this: C# string[,] Customers = { //Start of outer set, a set of rows {"Joe Smith", "US"}, //one row of data, i.e., a set of columns {"Jim Allen", "US"}, // second row of data }; //end of the outer set You access the data from this two-dimensional array by indicating which elements from each dimension you want. For example, to print the name of Joe Smith you need to access the zeroth element of dimension 0 and the zeroth element of dimension 1: VB .NET Console.WriteLine(Customers(0, 0)) 'Row zero Column zero is "Joe Smith" Console.WriteLine(Customers(1, 0)) 'Row one Column zero is "Jim Allen" C# Console.WriteLine(Customers[0, 0]); //Row zero Column zero is "Joe Smith" Console.WriteLine(Customers[1, 0]); //Row one Column zero is "Jim Allen"
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Like the number of elements in an array, the number of an array s dimensions cannot change once it has been created. At least it cannot be changed and still keep its data. After an array is made, the dimensions and length of an array must stay the same for the entire lifetime of the array or you will lose the data you put into it. Multidimensional arrays can include three, four, five, or more dimensions, but usually they will only have two. Perhaps this is because humans get confused when reading code using more than two dimensions. In fact, it is not uncommon for even two dimensions to be difficult for new programmers to grasp. If you find them confusing, rest assured that you are not alone, many people do. Still, a table of values, as in our spreadsheet example, is an undoubtedly useful way to store data. When you find yourself needing to store data like this, you may want to know about a somewhat easier way to do this. This easier way is done by using a single-dimensional array that holds a set of structures. Here is an alternative example using a structure and the same data we just used. Although both will do the job, many people find this one easier to read: VB .NET Structure Customers Public Name As String Public Country As String End Structure Sub Main() Dim c1 As Customer c1.Name = "Joe Smith" c1.Country = "US" Dim c2 As Customer c2.Name = "Jim Allen" c2.Country = "US" Dim USCustomers As Customer() = {c1, c2} 'Contains a list of Customers objects End Sub C# struct Customer { public string Name; public string Country; } static void Main() { Customer c1; c1.Name = "Joe Smith"; c1.Country = "US";
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Customer c2; c2.Name = "Jim Allen"; c2.Country = "US"; Customer[] USCustomers = { c1, c2 };//Contains a list of Customers objects } Now that you have seen both single and multidimensional arrays, you may want to know that VB .NET and C# actually support three types of arrays: single-dimensional arrays, multidimensional arrays (rectangular arrays), and array-of-arrays (jagged arrays). Although jagged arrays are an advance concept, we have included it here for completeness. The following examples compare how to declare the three different kinds of arrays: VB .NET, To Declare Single-Dimensional Arrays Dim numbers As Integer() C#, To Declare Single-Dimensional Arrays int[] numbers; VB .NET, To Declare Multidimensional Arrays Dim Customers As String(,) C#, To Declare Multidimensional Arrays string[,] Customers; VB .NET, To Declare Array-of-Arrays (Jagged Arrays) Dim Departments()() As String C#, To Declare Array-of-Arrays (Jagged Arrays) string[][] Departments; To understand the Array-of-Arrays example, consider this list of employees and their departments: Programmers: Hal Olson and Dan Duncan Testers: Joe Hunter Notice that this is really two lists: one for the departments and one for the employees in the departments. This could be represented by creating two interrelated arrays: one for the programmer employees and one for the tester employees. In code, it would look like this: VB .NET Dim Deptarments As String()() = _ New String()() {New String() {"Programmers", "Hal Olson", "Dan Duncan"}, _ New String() {"Testers", "Joe Hunter"}}
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