[英]How to compare two lists based on indexes
I have two lists which are identical in length.我有两个长度相同的列表。 If one list has 4 elements, other list has also 4 elements.
如果一个列表有 4 个元素,则另一个列表也有 4 个元素。
List<string> multipleJMBGs
and List<BundleSchedule> schedules
List<string> multipleJMBGs
和List<BundleSchedule> schedules
I need to create a check method, which will be checking following:我需要创建一个检查方法,它将检查以下内容:
First check if there any duplicates in List<string>
and if there is, then grab indexes from that query, and within these indexes check if schedules have same Id if schedules[x].Id == chedules[y].Id
首先检查
List<string>
中是否有任何重复项,如果有,则从该查询中获取索引,并在这些索引中检查调度是否具有相同的 Id if schedules[x].Id == chedules[y].Id
there can be multiple same pairs, for example:可以有多个相同的对,例如:
"1111", "1111" (indexes [23],[41])
"12345", "12345" (indexes [3],[11])
"16872982342716", "16872982342716" (indexes [29],[33])
those are 3 pairs, so we need to groupBy, and extract their indexes (those numbers are just for example purposes):这些是 3 对,所以我们需要分组,并提取它们的索引(这些数字仅用于示例目的):
private bool CheckIfSameUsersHaveSameServices(List<string> multipleJMBGs, List<BundleSchedule> schedules)
{
var duplicateJMBGs = multipleJMBGs.GroupBy(x => x)
.Where(group => group.Count() > 1)
.Select(group => new { jmbg = group.Key }).ToList();
Dictionary<string, string> indexes = new Dictionary<string, string>();
//fill in dictionary with indexes
//23,41
//3,11
//29,33
foreach (var pair in indexes)
{
var firstToCompare = schedules.ElementAt(Convert.ToInt32(pair.Key));
var secondToCompare = schedules.ElementAt(Convert.ToInt32(pair.Value));
//if only one compared pair has same serviceId, return true
if (firstToCompare.ServiceTypeComplexityId == secondToCompare.ServiceTypeComplexityId)
{
return true;
}
}
}
Mine question is how to put in Select of GroupBy query also those indexes from a list?我的问题是如何输入 GroupBy 的 Select 查询以及列表中的那些索引?
How about:怎么样:
Dictionary<string, int> jmbgIds = new Dictionary<string, int>(StringComparer.Ordinal);
for (int index = 0; index < multipleJMBGs.Count; index++)
{
string jmbg = multipleJMBGs[index];
int id = schedules[index].ServiceTypeComplexityId;
if (jmbgIds.TryGetValue(jmbg, out var previousId))
{
if (previousId != id)
{
return false;
}
}
else
{
jmbgIds.Add(jmbg, id);
}
}
return true;
You can get the index and value for each enumerable and perform a Join.您可以获取每个可枚举的索引和值并执行联接。 Fiddle: https://dotnetfiddle.net/0oDJMM
小提琴: https://dotnetfiddle.net/0oDJMM
public static void Main()
{
List<string> foo = new List<string>() {
"1", "12", "123", "1234", "12345"
};
List<string> bar = new List<string>() {
"123", "a", "b", "1", "12"
};
var foos = foo.Select((f, i) => new { idx = i, val = f });
var bars = bar.Select((b, i) => new { idx = i, val = b });
var indexes = foos.Join(bars,
f => f.val,
b => b.val,
(f, b) => new { idxA = f.idx, idxB = b.idx });
foreach (var idxs in indexes) {
Console.WriteLine("idxA: {0} idxB: {1}", idxs.idxA, idxs.idxB); // You can now access the indexes for the matching values
}
}
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