通过使用linq将对象列表转换为字符串和int数组来创建对象

Question

我试图从数据库中选择列，然后为每列创建一个数组属性，并创建一个对象。

public class Activity
{
public string[] Quiz { get; set; }
public int[] CompletedCount { get; set; }
}

结果的数据库输出将返回为：

IQueryable<QuizCompletedCount> results = _logContext.QuizCompletedCounts;

我从数据库中获得了以下格式的值。

Week        | Completed
---------------------------
Week 1      |   107
Week 2      |   104
Week 3      |   87
Week 4      |   49
Week 5      |   6

我尝试过这种方式：

List<int> activityCount = new List<int>();
List<string> activity = new List<string>();
foreach (var element in results)
{
activity.Add(element.Week);
activityCount.Add(element.Completed);
}
var obj = new QuizActivity();
obj.CompletedCount = activityCount.ToArray();
obj.Week = activity.ToArray();

所需输出将看起来像：

string str = "{"Week":["Week 1","Week 2","Week 3","Week 4","Week 5"],"CompletedCount":[107,104,87,49,6]}";

有没有linq方法可以在不使用foreach和从列表到数组的多次转换的情况下完成此任务？

Answer 1

您可以制作这样的东西：

var result = new QuizActivity()
{
Week = results.Select(x => x.Week).ToList(),
CompletedCount = results.Select(x => x.Completed).ToList()
};