public bool CreateWorkItem(Project tfsProject, List<TFSWorkItemModel> tfsModels)
        {
            WorkItemType workItemType = tfsProject.WorkItemTypes["测试用例"];
            TFSUserCaseModel tfsModel = null;
            List<WorkItem> allWorkItem = new List<WorkItem>();
            for (int i = 0; i < tfsModels.Count; i++)
            {
                tfsModel = (TFSUserCaseModel)tfsModels[i];
                WorkItem workItem = new WorkItem(workItemType);
                workItem.Title = tfsModel.Title;
                workItem.AreaPath = tfsModel.Area;
                workItem.IterationPath = tfsModel.Iteration;
                workItem.Fields["测试类型"].Value = tfsModel.TestType;
                workItem.Fields["用例设计人"].Value = tfsModel.Designer;
                workItem.Fields["用例创建阶段"].Value = tfsModel.CreatedPhase;
                workItem.Fields["指派给"].Value = tfsModel.AssignTo;     
                workItem.Fields["步骤"].Value = TestStepConvert.ConvertToStep(tfsModel.Steps); 

                if (!string.IsNullOrEmpty(tfsModel.RequirementID))
                {
                    WorkItemLinkTypeEnd workItemLinkTypeEnd = tfsProject.Store.WorkItemLinkTypes.LinkTypeEnds["测试"];
                    WorkItemLink workItemLink = new WorkItemLink(workItemLinkTypeEnd, int.Parse(tfsModel.RequirementID));
                    workItem.Links.Add(workItemLink);
                }

                if (workItem.Validate().Count > 0)
                {               
                    StringBuilder sb = new StringBuilder();
                    string userCaseErrorMessage =  string.Format("用例:{0} 格式不正确。",workItem.Title );
                    sb.Append(userCaseErrorMessage );
                    foreach (Field item in workItem.Validate())
                    {
                        sb.Append( "--" + item.Name);
                    }
                    invalidWorkItems.Add(sb.ToString());
                }
                allWorkItem.Add(workItem);

            }

            if (invalidWorkItems.Count <= 0)
            {
                foreach (var item in allWorkItem)
                {
                    try
                    {
                        item.Save();
                    }
                    catch
                    {
                        throw new LinkedWITException("wrong requirement ID");
                    }
                }
            }
            return true;
        }