在createTask的代码中:
SPGroup group= workflowProperties.Web.Groups["董事会"];
SPFieldUserValue groupvalue = new SPFieldUserValue(group.ParentWeb, group.ID, group.Name);
createTask1_TaskProperties1.AssignedTo = groupvalue.LookupValue;
System.Collections.Specialized.HybridDictionary specialPerissions=new System.Collections.Specialized.HybridDictionary ();
specialPerissions.Add (groupvalue.LookupValue,SPRoleType.Contributor);
createTaskWithContentType1.SpecialPermissions = specialPerissions;