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Interaction.IIf Method

Returns one of two objects, depending on the evaluation of an expression.

Namespace:  Microsoft.VisualBasic
Assembly:  Microsoft.VisualBasic (in Microsoft.VisualBasic.dll)

public static Object IIf(
	bool Expression,
	Object TruePart,
	Object FalsePart
)

Parameters

Expression
Type: System.Boolean

Required. Boolean. The expression you want to evaluate.

TruePart
Type: System.Object

Required. Object. Returned if Expression evaluates to True.

FalsePart
Type: System.Object

Required. Object. Returned if Expression evaluates to False.

Return Value

Type: System.Object
Returns one of two objects, depending on the evaluation of an expression.

The IIf function provides a counterpart for the ternary Conditional Operator: ? : in Visual C++.

This example uses the IIf function to evaluate the testMe parameter of the checkIt procedure and returns the word "Large" if the amount is greater than 1000; otherwise, it returns the word "Small".

Function checkIt(ByVal testMe As Integer) As String 
    Return CStr(IIf(testMe > 1000, "Large", "Small"))
End Function

Note that if Option Strict is On, you must use the CStr keyword to explicitly convert the return from Object to String.

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1
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