IsNullOrEmpty

The IsNullOrEmpty component determines if the given text is null or an empty string.

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Ports

The IsNullOrEmpty component exposes the Control In, Control Out, Data In, and Data In ports by default.

Port Description
ControlIn Must be connected to the Control Out port of one or more components.
ControlOut Can be connected to the Control In port of another component or the default end component.
Data In Specifies the text (string) to be checked as a null or an empty string.
Data Out Returns the Boolean value “True” if the string is null or empty. Otherwise, returns “False”.

Properties

To edit the properties of the IsNullOrEmpty component, in the Properties window, change the required property. You can edit the following properties.

Property Description
Search Search for the respective property.
Delay After Execution Specifies the wait time (in seconds) after the action is performed.
Delay Before Execution Specifies the wait time (in seconds) before the action is performed.

Example

Let us consider an example .

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To determine if a string is null or empty:

  1. In the Toolbox, expand Utilities and then expand String Utilities.

  2. Drag the IsNullOrEmpty component and drop it on the Design surface.

  3. Double-click the text box and enter the required string.

  4. To override the existing data source, right-click the text box.

  5. Click Override and change the data source.

    Note

    To learn more about overriding the data source of the data port, refer the Override section.

  6. To enable display of the returned value:

    • In the Toolbox, expand General.
    • Expand the MessageBox component, drag Show component and drop it on the Design surface.
  7. Connect the control ports and data ports in the activity.

  8. In the toolbar, click Run.
    The messagebox displays “True” if the string is null or empty.

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    The messagebox displays “False” if the string is not null or empty.

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  9. Click OK.