无法在c＃

Question

我已经在c＃中创建了一个返回元组的方法。我很难将结果分配给元组。

我创建了一个名为Tuple benchMarkReturns的Tuple； 如何分配值。目前，当我做一个BenchMarkReturns。 ，我的意思是点，我获得了只读的Item1和Item2属性。

如果有人认为有更好的方法可以提出建议

需要在以下foreach循环中为字段Bmrk1和Bmrk2调用该方法。

我需要将compoundReturnsBenchMark1和compoundReturnsBenchMark2分配给元组

foreach (var p in performance)
                {
                    var model = new TrackRecordVM
                    {
                        Year = p.Key,
                        Jan = (double?)(p.FirstOrDefault(x => x.VALUEDATE.Month == 1) != null ? p.FirstOrDefault(x => x.VALUEDATE.Month == 1).MTD : null),
                        Feb = (double?)(p.FirstOrDefault(x => x.VALUEDATE.Month == 2) != null ? p.FirstOrDefault(x => x.VALUEDATE.Month == 2).MTD : null),
                        Mar = (double?)(p.FirstOrDefault(x => x.VALUEDATE.Month == 3) != null ? p.FirstOrDefault(x => x.VALUEDATE.Month == 3).MTD : null),
                        Apr = (double?)(p.FirstOrDefault(x => x.VALUEDATE.Month == 4) != null ? p.FirstOrDefault(x => x.VALUEDATE.Month == 4).MTD : null),
                        May = (double?)(p.FirstOrDefault(x => x.VALUEDATE.Month == 5) != null ? p.FirstOrDefault(x => x.VALUEDATE.Month == 5).MTD : null),
                        Jun = (double?)(p.FirstOrDefault(x => x.VALUEDATE.Month == 6) != null ? p.FirstOrDefault(x => x.VALUEDATE.Month == 6).MTD : null),
                        Jul = (double?)(p.FirstOrDefault(x => x.VALUEDATE.Month == 7) != null ? p.FirstOrDefault(x => x.VALUEDATE.Month == 7).MTD : null),
                        Aug = (double?)(p.FirstOrDefault(x => x.VALUEDATE.Month == 8) != null ? p.FirstOrDefault(x => x.VALUEDATE.Month == 8).MTD : null),
                        Sep = (double?)(p.FirstOrDefault(x => x.VALUEDATE.Month == 9) != null ? p.FirstOrDefault(x => x.VALUEDATE.Month == 9).MTD : null),
                        Oct = (double?)(p.FirstOrDefault(x => x.VALUEDATE.Month == 10) != null ? p.FirstOrDefault(x => x.VALUEDATE.Month == 10).MTD : null),
                        Nov = (double?)(p.FirstOrDefault(x => x.VALUEDATE.Month == 11) != null ? p.FirstOrDefault(x => x.VALUEDATE.Month == 11).MTD : null),
                        Dec = (double?)(p.FirstOrDefault(x => x.VALUEDATE.Month == 12) != null ? p.FirstOrDefault(x => x.VALUEDATE.Month == 12).MTD : null),
                        YTD = (double?)(p.FirstOrDefault(x => x.VALUEDATE.Month == 12) != null ? p.FirstOrDefault(x => x.VALUEDATE.Month == 12).YTD : null),
                        Bmrk1 =  ,
                        Bmrk1Name = "Test1",
                        Bmrk2 =  ,
                        Bmrk2Name = "Test2"
                        //Bmrk = (double?)(p.FirstOrDefault(x => x.VALUEDATE.Month == 12) != null ? p.FirstOrDefault(x => x.VALUEDATE.Month == 12).BENCHMK1_MTD : null),
                        //BmrkName = p.FirstOrDefault(x => x.VALUEDATE.Month == 12) != null ? p.FirstOrDefault(x => x.VALUEDATE.Month == 12).BENCHMK1_INDEX_NAME : null
                    }; 

返回元组值的方法

private Tuple<double, double> GetBenchMarkByYear(int year, int benchMark1, int benchMark2)
        {
            Tuple<double, double> benchMarkReturns;
            var benchMark1Returns = GetViewService<MV_INDEX_PERFORMANCE>().Where(x => x.Mtd != null && x.IndexId == benchMark1 && x.PriceDate.Year == year).Select(x => x.Mtd).ToArray();
            var benchMark2Returns = GetViewService<MV_INDEX_PERFORMANCE>().Where(x => x.IndexId == benchMark2 && x.PriceDate.Year == year).Select(x => x.Mtd).ToArray();
            double[] temp1 = benchMark1Returns.Cast<double>().ToArray();
            double[] temp2 = benchMark2Returns.Cast<double>().ToArray();
            var compoundReturnsBenchMark1 = CompoundReturns(temp1);
            var compoundReturnsBenchMark2 = CompoundReturns(temp2);


            return benchMarkReturns;
        }

Answer 1

return benchMarkReturns; benchMarkReturns从未分配。

benchMarkReturns = new Tuple<double, double>(compoundReturnsBenchMark1, compoundReturnsBenchMark2);

将解决您的问题

Answer 2

代码中的问题是您声明了变量Tuple<double, double> benchMarkReturns，但从未为其分配值。

因此，这应该是您的方法：

private Tuple<double, double> GetBenchMarkByYear(int year, int benchMark1, int benchMark2)
        {
            var benchMark1Returns = GetViewService<MV_INDEX_PERFORMANCE>().Where(x => x.Mtd != null && x.IndexId == benchMark1 && x.PriceDate.Year == year).Select(x => x.Mtd).ToArray();
            var benchMark2Returns = GetViewService<MV_INDEX_PERFORMANCE>().Where(x => x.IndexId == benchMark2 && x.PriceDate.Year == year).Select(x => x.Mtd).ToArray();
            double[] temp1 = benchMark1Returns.Cast<double>().ToArray();
            double[] temp2 = benchMark2Returns.Cast<double>().ToArray();
            var compoundReturnsBenchMark1 = CompoundReturns(temp1);
            var compoundReturnsBenchMark2 = CompoundReturns(temp2);

            Tuple<double, double> benchMarkReturns = new Tuple<double, double>(compoundReturnsBenchMark1 , compoundReturnsBenchMark2);

            return benchMarkReturns;
        }