asp.net-mvc - 如何将两个查询从一个视图传递到一个视图

Question

我希望这两种方法传递给一个视图：

 public IEnumerable<ProfitAndCostViewModel> getProfitSum()
        {
            var profBalance = db.Profits
   .Where(x => x.IdUser.UserId == WebSecurity.CurrentUserId)
   .GroupBy(x => x.IdUser.UserId)
   .Select(x => new ProfitAndCostViewModel { ProfitSum = x.Sum(y => y.Value) })
   .ToList();
            return profBalance;
        }

        public IEnumerable<ProfitAndCostViewModel> getCostSum()
        {
            var costBalance = db.Costs
   .Where(x => x.IdUser.UserId == WebSecurity.CurrentUserId)
   .GroupBy(x => x.IdUser.UserId)
   .Select(x => new ProfitAndCostViewModel { CostSum = x.Sum(y => y.Value) })
   .ToList();
            return costBalance;
        }

在我的 ActionResult 我有这个：

var pcv = new ProfitAndCostViewModel();
            pcv.ProfModel =getProfitSum();
            pcv.CostModel =getCostSum();

             return View(pcv);

在 ProfitAndCostViewModel 代码中是这样的：

public double ProfitSum { get; set; }
        public double CostSum { get; set; }
        public double FinalBalance { get; set; }
        public IEnumerable<ProfitAndCostViewModel> ProfModel { get; set; }
        public IEnumerable<ProfitAndCostViewModel> CostModel { get; set; }

这是错误：The model item passed into the dictionary is of type 'WHFM.ViewModels.ProfitAndCostViewModel', but this dictionary requires a model item of type 'System.Collections.Generic.IEnumerable1 [WHFM.ViewModels.ProfitAndCostViewModel]'。`

Answer 1

看起来您的视图是强类型的IEnumerable<ProfitAndCostViewModel>：

@model IEnumerable<ProfitAndCostViewModel>

但在这里你将一个ProfitAndCostViewModel实例传递给它：

var pcv = new ProfitAndCostViewModel();
pcv.ProfModel =getProfitSum();
pcv.CostModel =getCostSum();
return View(pcv);

因此，您应该修复输入视图的模型：

@model ProfitAndCostViewModel