AllowEmptyString

Gets or sets a value indicating whether the MfParams instance accepts empty MfString instances.

OutputVar := instance.AllowEmptyString
instance.AllowEmptyString := value

Value

MfBool instance or var boolean

Gets

Gets a value var boolean indicating whether the MfParams instance accepts empty MfString instances.

Sets

Sets a value indicating whether the MfParams instance accepts empty MfString instances.

Remarks

Default Value is false.

If set to true then you may add "" values into the Add() method. The default value is false so adding null value in using the constructor is not possible. You must first create an instance of MfParams, set AllowEmptyString to true and then you can use the Add() method to add null values.

If an attempt to set a null value using Add() is made with first setting AllowEmptyString to true then an MfException will be thrown by Add().

If AllowEmptyValue is true and AllowEmptyString is true then the Add() method will add "" values as Undefined to the underlying list. AllowOnlyAhkObj takes priority over AllowEmptyValue and if AllowOnlyAhkObj is true Empty values such as null or Undefined cannot be added to the underlying list.

To ensure that "" is added as in instance of MfString you could set AllowEmptyString to true and use the AddString() method which converts "" to MfString with empty Value and adds to the underlying list

Example

p := new MfParams()
p.AllowEmptyString := true
p.AddString("") ; converts to MfString with value of "" if AllowEmptyString is true
p.Add(new MfInteger(33))

; converts to MfString with value of "" if AllowEmptyValue if false and AllowEmptyString is true
p.Add(MfNull.Null)