Question

在服务器上，我在名为MeasurementService的域服务类上有以下方法

public MeasurementPresentationModel GetSingleMeasurementPM(Guid Id)
    {
        var m = this.ObjectContext.Measurments.SingleOrDefault(t => t.ID == Id);
        return new MeasurementPresentationModel()
               {
                   ID = m.ID,
                   Objective = m.Objective.Code,
                   ObjectiveID = m.ObjectiveID,
                   MeasurementList = m.MeasurmentList.Code,
                   MeasurementListID = m.MeasurementListID,
                   Weight = m.Wieght,
                   HasEvaluation = m.HasEvaluation,
                   ValidityEndDate = m.ValidityEndDate,
                   ValidityStartDate = m.ValidityStartDate,
                   DataType = m.DataType
               };
    }

在我的ViewModel上，我实现了域服务MeasurementContext _context并尝试编写一个无法正常工作的加载方法：

public MeasurementEditViewModel(MeasurementPresentationModel model):this()
    {          
      _context = new MeasurementContext(); 
        var qry = _context.GetSingleMeasurementPMQuery(model.ID);
        var lo = _context.Load(qry);
        lo.Completed += (sender, e) => 
        {
            SelectedMeasurement = lo.Entities;
        }
    }

我做错了什么以及如何从ViewModels进行服务调用？

Answer 1

Load方法是一种查询方法，它应该返回IQueryable或IEnumerable。尝试更改服务方法的合同，如：

public IEnumerable<MeasurementPresentationModel> GetSingleMeasurementPM(Guid Id)

如何从我的ViewModel调用我的DomainService方法（带参数）？

1 个答案: