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How can I create a method that has optional parameters in it in Visual Basic?
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To declare optional function parameters in JavaScript, there are two approaches: Using the Logical OR operator ('||'): In this approach, the optional parameter is Logically ORed with the default value within the body of the function. Note: The optional parameters should always come at the end on the parameter list.
The optional parameter(s) must be at the end of the parameter list. The IsMissing function will work only with parameters declared as Variant . It will return False when used with any other data type. User defined types (UTDs) cannot be optional parameters.
Using Optional Attribute Here for the [Optional] attribute is used to specify the optional parameter. Also, it should be noted that optional parameters should always be specified at the end of the parameters. For ex − OptionalMethodWithDefaultValue(int value1 = 5, int value2) will throw exception.
Optional parameters must be the last parameters defined, to avoid creating ambiguous functions. Sub MyMethod(ByVal Param1 As String, Optional ByVal FlagArgument As Boolean = True) If FlagArgument Then 'Do something special Console.WriteLine(Param1) End If End Sub.
Use the Optional keyword and supply a default value. Optional parameters must be the last parameters defined, to avoid creating ambiguous functions.
Sub MyMethod(ByVal Param1 As String, Optional ByVal FlagArgument As Boolean = True) If FlagArgument Then 'Do something special Console.WriteLine(Param1) End If End Sub Call it like this:
MyMethod("test1") Or like this:
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