"Exist In Collection" Activity

Table of Contents

1. Activity Program Name

2. Description

3. Properties

4. Usage

1. Activity Program Name

System.Activities.Statements.ExistsInCollection

2. Description

Up to Studio Version 2.0.2.0
Quick Access: Toolbox > Collections > Exists in Collection

From Studio Version 2.0.3.0
Quick Access: Toolbox > System > Collections > Exists in Collection

This activity checks whether the specified item exists within a collection.

• Verified in Studio Version: 2.1.1.2

• The wording may vary slightly depending on the version.

3. Properties

4. Usage

The following example demonstrates checking for the existence of a specific item in a newly created List of type String.

Drag and drop the Assign activity from System > Originals to the designer panel.

In the To field under Miscellaneous properties, enter a variable of type List<String> (e.g., sample).

(Refer to the "Creating Variables" guide for details.)

In the Value field, enter: new List(Of String) From {"A", "B", "C"}

Drag and drop the Exists in Collection activity from System > Collections to the designer panel.

Click the TypeArgument property under Miscellaneous and select String.

In the Collection field, enter the List<String> variable (e.g., sample).

In the Result field, enter a variable of type Boolean (e.g., result).

In the Item field, enter a string or String type variable (e.g., "A").

To verify the execution results, drag and drop the Write Line activity from System > Originals to the designer panel and configure it with: result.ToString

Click Home > Start or press F5 to run the workflow. Open the output panel and verify the results.

• If the item "A" exists in the collection, the output will display:
  True

         Example with "A" as the specified item:

• If the item "D" is specified (which does not exist in the collection), the output  will display: False

Example with "D" as the specified item: