LINQ查询toarray（） - 如何访问数组？ [英] LINQ query toarray() - how to access array?

问题描述

我有一个LINQ查询，它给我一个与索引相关的平均值。我已经将查询转换为数组，但我无法弄清楚如何对数组做任何事情（我需要使用查询数据）。我的LINQ只是如此如此

i have a LINQ query that gives me an average linked to an index. I've turned the query into an array, but i can't figure out how do anything with the array (i need to use the query data). My LINQ is only so so

var vavg = (from z in data
                       where z.Y > 0 && z.Y < 0.1
                       group z by z.X into XGroup
                       select new
                       {
                           X = XGroup.Key,
                           vavg = XGroup.Average(z => z.A),
                       }).ToArray();

i得到正确的结果，但查询不是以真正的数组返回，我需要对它们进行操作，所以我需要一个double [] []，其中[0]是X而[1]是vavg



我尝试过：



vavg.Average（）;返回错误

double [] [] test = new double [2] [];

test [0] = vavg [0];返回错误



错误似乎与数组的结构有关，这不是一个真正的数组，看起来更像是一个数据结构给我

i get the correct results but the query isn't returned in a true array, i need to do operations on them so i need a double[][] where [0] is X and [1] is vavg

What I have tried:

vavg.Average(); returns error
double[][] test = new double[2][];
test[0] = vavg[0]; returns error

the errors seem to be related to the structure of the Array which isn't a "real" array and looks more like a data structure to me

推荐答案

你需要更改你的选择，以便它创建你的锯齿状数组元素。

you need to change your select so that it creates your jagged array elements.

var vavg = (from z in data
                       where z.Y > 0 && z.Y < 0.1
                       group z by z.X into XGroup
                       select new double []
                       {
                           XGroup.Key,
                           XGroup.Average(z => z.A),
                       }).ToArray();

参见 new double [] 在上选择。还摆脱了那里的临时任务 - 他们不需要。

See the declaration of the new double[] on the select. Also got rid of the temporary assignments in there - they're not needed.

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