- Release Notes
- Getting Started
- Setup and Configuration
- Automation Projects
- Dependencies
- Types of Workflows
- File Comparison
- Automation Best Practices
- Source Control Integration
- Debugging
- The Diagnostic Tool
- Workflow Analyzer
- About Workflow Analyzer
- ST-NMG-001 - Variables Naming Convention
- ST-NMG-002 - Arguments Naming Convention
- ST-NMG-004 - Display Name Duplication
- ST-NMG-005 - Variable Overrides Variable
- ST-NMG-006 - Variable Overrides Argument
- ST-NMG-008 - Variable Length Exceeded
- ST-NMG-009 - Prefix Datatable Variables
- ST-NMG-011 - Prefix Datatable Arguments
- ST-NMG-012 - Argument Default Values
- ST-NMG-016 - Argument Length Exceeded
- ST-DBP-002 - High Arguments Count
- ST-DBP-003 - Empty Catch Block
- ST-DBP-007 - Multiple Flowchart Layers
- ST-DBP-020 - Undefined Output Properties
- ST-DBP-023 - Empty Workflow
- ST-DBP-024 - Persistence Activity Check
- ST-DBP-025 - Variables Serialization Prerequisite
- ST-DBP-026 - Delay Activity Usage
- ST-DBP-027 - Persistence Best Practice
- ST-DBP-028 - Arguments Serialization Prerequisite
- Variables
- Arguments
- Imported Namespaces
- Recording
- UI Elements
- Control Flow
- Selectors
- Object Repository
- Data Scraping
- Image and Text Automation
- Automating Citrix Technologies
- RDP Automation
- SAP Automation
- VMware Horizon Automation
- Logging
- The ScaleCoordinates Migration Tool
- The ScreenScrapeJavaSupport Tool
- The WebDriver Protocol
- StudioPro
- Extensions
- Troubleshooting
About Libraries
A library is a project which contains one or more workflows that can be reused as activities in other projects. Libraries are saved as NUPKG files when published and can be installed as dependencies from the Package Manager.
For example, you could create a library that collects data from an Excel spreadsheet and appends it to another, as explained in the Creating a Basic Library page. Next, the library can be packaged and used in other processes as an activity.
- Go to the Studio Backstage View > Start > Library. This opens the New Blank Library window.
- Fill in the name and pick a location for the library. The default location is
C:\Users\<current_user>\Documents\UiPath. Add a description and select Create. The new library is created and saved on your local machine.
-
The Project Panel displays the tree view with the Project folder, Dependencies, and the
NewActivity.xamlwhich contains the actual workflow.Each workflow file in a library is available as an activity in projects where the library is installed as a dependency. If you want to make a certain file private, right-click it and select Ignore from Publish. In this case, the file is included in the library package, but it is not available as a reusable component in the Activities panel.
Note: By default, the dependencies available for new libraries are the same as for blank new projects, namelyUiPath.Excel.Activities,UiPath.Mail.Activities,UiPath.System.Activities, andUiPath.UIAutomation.Activities, with the Lowest Applicable Version runtime rule.
To add a tooltip and help link to an activity, right-click the workflow file in the Project panel and select Properties. The tooltip is visible when you hover over the activity in the Activities and Designer panels in projects where the library is installed. The Help Link opens when you select the activity in the Designer panel and press F1.
Arguments you define in the library become activity properties in the projects where the library is installed as a dependency. Annotations you add to an argument in the library are displayed as a tooltip for the property in the resulting activity's Properties panel. For more information about arguments, see Arguments Panel.
- In the case of libraries, it is recommended to use
Nothingto assign a null value to a variable, rather than"". This is done to avoid any inconsistencies when using the packaged library as a dependency to a project. - The ImplementationVersion property of the
System.Activities.ActivityBuilderobject is not supported. Setting a value for this property results in arguments not being saved. This object is displayed in the Properties panel when you select the blank area of the Designer panel.
To configure the settings of a library project, open the Project Settings window by clicking Settings 
in the Project panel.
The following options are available in the General tab:
- Name - edit the name of the project.
- Description - edit the description of the project.
- Include Sources - set to Yes to package all
.xamlsources within the generated assembly file, including workflows that were previously made private. If needed, you can then decompile the assembly file and extract the workflows, which can be helpful at debug time. - Compile activities expressions - set to Yes to compile and package all activities expressions with the library. This results in an improved execution time.
- Ready to Run - set to Yes to optimize the generated assemblies for faster JIT compilation at runtime.
- Modern Design Experience - set to Yes to enable a modern experience of working with UI Automation, including new and improved activities, recorders, and wizards, as well as the Object Repository.
Publishing libraries is similar to publishing processes. For more information, see About Publishing Automation Projects.
When publishing libraries, take into account the following limitations:
-
Due to NuGet limitations:
- You cannot publish libraries to locations that contain user-restricted subfolders using Windows environment path variables.
- Release notes for published libraries are visible only in Orchestrator.
- Libraries with special characters in the names of
.xamlfiles they contain may not be successfully published. - Libraries containing Invoke Workflow File activities with the Isolated option selected cannot be published. An error message is displayed in the Output panel.
- When using Invoke Workflow File activity, make sure the invoked file is located in the same folder as the library project.
- The Launch Workflow Interactive activity is not supported for libraries.
- Using Invoke Workflow File inside a library to reference the library itself is not supported.
Please note that in a library project, when using Import Workflows to add a workflow that contains a library, the dependencies referenced in the library are not imported.
When importing two versions of the same custom library to a project in Studio, the extra custom activities contained only in the second library are not visible in the Activities panel unless you remove the first imported library.
