How to add, remove and start workflow programmatically?

Removing Association

 

    1: SPSite site = new SPSite("https://localhost");

    2: SPWeb web = site.OpenWeb();

    3: SPList list = web.Lists["Shared Documents"];

    4: SPWorkflowAssociation _association = null;

    5: foreach (SPWorkflowAssociation association in list.WorkflowAssociations)

    6: {

    7: if (association.Name == "Approval")

    8: {

    9: _association = association;

   10: break; 

   11: }

   12: }

   13: if(_association !=null)

   14: list.RemoveWorkflowAssociation(_association);

Adding workflow to the library

    1: SPSite site = new SPSite("https://localhost");

    2: SPWeb web = site.OpenWeb();

    3: SPList list = web.Lists["Shared Documents"];

    4: SPList taskList = web.Lists["Tasks"];

    5: SPList historyList = web.Lists["Workflow History"]; 

    6: SPWorkflowTemplate _template = null;

    7: foreach (SPWorkflowTemplate template in web.WorkflowTemplates)

    8: {

    9: if (template.Name == "Approval")

   10: {

   11: _template = template;

   12: break; 

   13: } 

   14: }

   15: SPWorkflowAssociation asso = SPWorkflowAssociation.CreateListAssociation(_template, _template.Name, taskList, historyList); 

   16: list.AddWorkflowAssociation(asso);

Starting workflow

    1: SPSite site = new SPSite("https://localhost");

    2: SPWeb web = site.OpenWeb();

    3: SPList list = web.Lists["Shared Documents"];

    4: SPWorkflowAssociation association = AddWorkflow(); // Above function to get the SPWorlflowAssociation object

    5: SPWorkflowManager manager = site.WorkflowManager; 

    6: for (int idx = 0; idx < 10 ; idx++) // I'm assuming there would be atleast 10 items within the library

    7: {

    8: SPListItem item = list.Items[idx];

    9: manager.StartWorkflow(item,association, "you can pass any data here",true);

   10: }