c# - 无法转换列表 <List<double> >列出 <double>(Cannot convert List<List<double>> to List<double>)

Question

I created a list which has 100 list each with 60 values, I need to run all of those 6000 values held within the list called population through a test (shown at the bottom error) and im not sure how i would go about converting the List<List<double>> to List<double> , or if i even can

(我创建了一个包含100个列表的列表，每个列表具有60个值，我需要通过测试运行列表中称为“人口”的所有6000个值（显示在底部错误），并且我不确定如何转换List<List<double>>到List<double> ，或者我什至可以)

  ask by jason7762 translate from so

Answer 1

You can either start off with a List<double> and use AddRange , so that you flatten the collections.

(您可以从List<double>并使用AddRange ，以便展平集合。)

Or you can convert it using SelectMany , like this:

(或者，您可以使用SelectMany进行转换，如下所示：)

var list = new List<double>();
foreach (...)
{
    list.AddRange(someOtherList);
}

// Or

var list = new List<List<double>>();
var flattenedList = list.SelectMany(x => x);