Interaction.Choose(Double, Object[]) Method

Reference

Definition

Namespace:: Microsoft.VisualBasic

Assembly:: Microsoft.VisualBasic.Core.dll

Assembly:: Microsoft.VisualBasic.dll

Source:: Interaction.vb

Source:: Interaction.vb

Source:: Interaction.vb

Important

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Selects and returns a value from a list of arguments.

public:
 static System::Object ^ Choose(double Index, ... cli::array <System::Object ^> ^ Choice);

public static object? Choose (double Index, params object?[] Choice);

public static object Choose (double Index, params object[] Choice);

static member Choose : double * obj[] -> obj

Public Function Choose (Index As Double, ParamArray Choice As Object()) As Object

Parameters

Index: Double

Required. Double. Numeric expression that results in a value between 1 and the number of elements passed in the Choice argument.

Choice: Object[]

Required. Object parameter array. You can supply either a single variable or an expression that evaluates to the Object data type, to a list of Object variables or expressions separated by commas, or to a single-dimensional array of Object elements.

Returns

Object

Selects and returns a value from a list of arguments.

Examples

This example uses the Choose function to display a name in response to an index passed into the procedure in the Ind parameter.

Function GetChoice(ByVal Ind As Integer) As String
    GetChoice = CStr(Choose(Ind, "Speedy", "United", "Federal"))
End Function

Remarks

The Choose function returns a member of the list passed in Choice(), based on the value of Index. The first member of the list is selected when Index is 1. The last member of the list is selected when Index is UBound(Choice()). If Index is outside these limits, Choose returns Nothing.

If Index is not a whole number, it is rounded to the nearest whole number before being evaluated.

You can use Choose to look up a value in a list of possibilities.

Note

The expressions in the argument list can include function calls. As part of preparing the argument list for the call to Choose, the Visual Basic compiler calls every function in every expression. This means that you cannot rely on a particular function not being called if a different expression is selected by Index.

Applies to