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Variant.IsDate() Method

  • Статья

Version: Available or changed with runtime version 1.0.

Indicates whether an AL variant contains a Date variable.

Syntax

Ok :=   Variant.IsDate()

Note

This method can be invoked using property access syntax.

Parameters

Variant
 Type: Variant
An instance of the Variant data type.

Return Value

Ok
 Type: Boolean
true if the AL variant contains a Date variable, otherwise false.

Example

The following example determines whether an AL variant contains a Date variable. The code initializes the MyDate variable with a Date value. The MyDate variable is assigned to the variant variable that is named MyVariant. The IsDate method determines whether the variant contains a Date variable and stores the return value in the varResult variable. In this case, the variant contains a Date variable so true is returned and displayed in a message box. The IsCode Method (Variant) determines whether the variant contains a Code variable. The return value is false because the variant does not contain a code.

var
    MyDate: Date;
    MyVariant: Variant;
    varResult: Boolean;
    Text000: Label 'Does the variant >%1< contain a date variable? %2.';
    Text001: Label 'Does the variant >%1< contain a code variable? %2.';
begin
    MyDate := Today;  
    MyVariant :=  MyDate;  
    varResult := MyVariant.IsDate;  
    Message(Text000,MyVariant,varResult);  
    varResult := MyVariant.IsCode;  
    Message(Text001,MyVariant,varResult);  
end;

Variant Data Type
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