[英]c# LINQ Distinct() on multi level list
I have a List<List<int>>
with the following values: 我有一个具有以下值的
List<List<int>>
:
[1] = 1,2
[2] = 4,5,6
[3] = 1,3
What I want to do is to retrieve simple List with unique values => 1,2,3,4,5,6 (number one was duplicated in original list). 我想做的是检索具有唯一值=> 1,2,3,4,5,6的简单列表(第一个在原始列表中重复)。
If it was 1D List, I would use 如果是一维列表,我会使用
variable.Select(n=>n).Distinct();
however when I tried to use 但是当我尝试使用
variable.Select(n=>n.Select(x=>x)).Distinct();
I got 2D list (with unique values I guess). 我得到了2D列表(我猜有唯一的值)。 How can I solve this?
我该如何解决? Thanks
谢谢
You could just use SelectMany
with Distinct
您可以将
SelectMany
与Distinct
var uniqueList = list.SelectMany(x => x).Distinct().ToList();
SelectMany
flattents the List<List<int>>
into a IEnumerable<int>
and Distinct
eliminates the duplicates. SelectMany
将List<List<int>>
为IEnumerable<int>
而Distinct
消除了重复项。
private static void Main()
{
List<List<int>> xss = new List<List<int>>()
{
new List<int>() {1, 2},
new List<int>() {4, 5, 6},
new List<int>() {1, 3}
};
var xs = xss.SelectMany(x => x).Distinct();
Console.WriteLine(string.Join(" ",xs));
}
You could do SelectMany
if you want a distinct of your overall integers, but if you want distinc lists, you could do something like this; 如果您希望整体整数与众不同,则可以执行
SelectMany
,但是如果要使用distinc列表,则可以执行以下操作:
void Main()
{
List<List<int>> xss = new List<List<int>>()
{
new List<int>() {1, 2},
new List<int>() {1, 2},
new List<int>() {1, 2},
new List<int>() {4, 5, 6},
new List<int>() {1, 3}
};
xss.Select (x => string.Join(",", x)).Distinct();
}
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