How to invoke Workflow on the particular item using Sitecore API?

Question

We have the list of items in the Sitecore tree and all the items will be in a workflow.
we are updating these items programmatically and based on some condition, we have to assign the state of the workflow.
We are looking for some Sitecore API so that we can invoke the workflow using c# .

we are assuming associated workflow state action will execute.

Answer 1

Here is code which changes workflow state and executes actions:

public static WorkflowResult ChangeStateAndExecuteActions(Item item, ID workflowStateId)
{
    using (new EditContext(item))
    {
        item[FieldIDs.WorkflowState] = workflowStateId.ToString();
    }

    Item stateItem = item.Database.GetItem(workflowStateId);

    if (stateItem.HasChildren)
    {
        WorkflowPipelineArgs workflowPipelineArgs = new WorkflowPipelineArgs(item, null, null);

        Pipeline pipeline = Pipeline.Start(stateItem, workflowPipelineArgs);
        if (pipeline != null)
        {
            WorkflowCounters.ActionsExecuted.IncrementBy(pipeline.Processors.Count);
        }
    }

    return new WorkflowResult(true, "OK", workflowStateId);
}

I wrote it 4 years ago but it should still work.

You can read more in my blog post here:

https://www.cognifide.com/our-blogs/sitecore/changing-workflow-state-of-sitecore-items-programmatically/