Question

我想将linq结果分配给double数组。我有两个对象数组。我按下面的方式取出它们：

var chartSeries = MeterReadings.GroupBy(x => x.Name)
                  .Select(g => new
                  {
                     Name = g.Key,
                     Data = g.Select(x => x.Value).ToArray(),
                     Date = g.Select(x => x.ReadDate).ToArray()
                  }).ToArray();

尝试分配代码：

foreach (var item in chartSeries)
{
    int length = item.Data.Length;
    object[,] data =  ???  //first array item.Data and second item.Dates
    Series localSeries = new Series 
                         {
                              Name = item.Name, Data = new Data(data), Type = ChartType 
                         };
     Series.Add(localSeries);
 }

这一行object[,] data = ???我该怎么写？我想要像object[,] data = { item.Data, item.Dates }

这样的东西

我想这样：

Data = new Data(new object[,]
       {
          { new DateTime(1970, 9, 27), 0 },
          { new DateTime(1970, 10, 10), 0.6 },
          { new DateTime(1970, 10, 18), 0.7 },
          { new DateTime(1970, 11, 2), 0.8 },
          { new DateTime(1970, 11, 9), 0.6 },
          { new DateTime(1970, 11, 16), 0.6 },
          { new DateTime(1970, 11, 28), 0.67 },
          { new DateTime(1971, 1, 1), 0.81 },
          { new DateTime(1971, 1, 8), 0.78 },
          { new DateTime(1971, 1, 12), 0.98 },
          { new DateTime(1971, 1, 27), 1.84 },
          { new DateTime(1971, 2, 10), 1.80 },
          { new DateTime(1971, 2, 18), 1.80 },                                                            
          { new DateTime(1971, 6, 12), 0 }
       })

...谢谢

Answer 1

我更喜欢使用var：

var data = new object[2][];
data[0] = item.Data.Cast<Object>().ToArray();
data[1] = item.Date.Cast<Object>().ToArray();

根据您提供的精确度，您可以使用：

var data = item.Date.Zip(item.Data, (n, m) => new[] { n as object, m as object }).ToArray();

Answer 2

这样的事情应该做你需要的事情：

object[,] data = new object[2,length];

for (int i; i < length; i++)
{
    data[0, i] = item.Date[i];
    data[1, i] = item.Data[i];
}

您需要验证数组的构造方式（object[2,length]或object[length,2]。另外，我假设日期应该放在'first'中。

Linq结果加倍（多维数组）数组？

2 个答案: