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26 July 2016

How to use the K2 Workflow Client and K2 SmartObject Client APIs

K2 SmartObjects and K2 Workflows are not limited to only being accessed via K2 SmartForms and Workflows. By using the K2 SmartObject & Workflow API’s you can access SmartObjects and their methods as well as create and start workflows through code.

01 - K2 References

To access K2 SmartObjects you need to connect to the SmartObject Client Server

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02 - K2 SmartObject Client Server Connection

Once you have established your connection to the SmartObject Client Server you need to “Get” the SmartObject, specify the input properties and finally execute the SmartObject.

Methods can be in the form of either scalar or list (to name a few) which you can define when executing the SmartObject.

03 - Scalar Method Execution

It is important to note that the SmartObject and Method names are the names stored by K2 which is usually not identical to the names you created them with. For example, if you create a SmartObject called “My.SmartObject”, K2 will likely save it as “My_SmartObject”. The same applies to method names.

The K2 SmartObject tester can be used to inspect the exact names K2 assigned to SmartObjects and Methods. An easy way to inspect is to generate a C# class for the SmartObject – this opens a C# class will all methods, properties and the SmartObject defined as it is saved by K2.

04 - Custom ServiceObject Method Parameters

Another important note is that input parameters that are mapped to ServiceObject method parameters will result in an error when you try to assign them via code. For properties to resolve correctly they need to be mapped directly to a SmartObject property.

05 - List Method Execution

When executing a list method gaining access to the results are usually shown as looping through the list. Depending on what you need to do with the results this can be improved by casting the SmartObjecsList as a dynamic object and then using LINQ.

 

06 - Workflow Project Structure

06 – Workflow Project Structure

To create and start a K2 Workflow the approach is similar. You create a workflow connection and specify the process instance, folio as well as data fields (if necessary). A process instance with the project layout shown in the snippet above will have a process name as shown in the code snippet below.

07 - Workflow Process Execution

The workflow can be started either synchronously or asynchronously as shown in the code snippet above.

Need further technical advice or support?