在另一个列表C＃中搜索整数列表

Question

I would like to find all the occurances of my source list in my dictionary.

Currently, I'm looping through my dictionary, and comparing each value of dictionary.

Dictionary<string, list<int>> refList.
List<int> sourceList.

foreach(KeyValuePair<string, List<int>> kvp in refDict)
{
  List<int> refList = (List<int>)kvp.Value;
  bool isMatch = (refList.Count == sourceList.Count && refList.SequenceEqual(sourceList));
  if (isMatch)
  {
     ......
     ......
  }
}

I would like to find the indexes in my dict of all the occurances of my source list.

Answer 1

I do not understand why you need a position (not an index!) of dictionary items because order of items is non deterministic, MSDN :

For purposes of enumeration, each item in the dictionary is treated as a KeyValuePair structure representing a value and its key. The order in which the items are returned is undefined.

but anyways:

Prepare data:

IDictionary<string, List<int>> refDict = new Dictionary<string, List<int>>
                                {
                                    {"item1", new List<int> {1, 2, 3}},
                                    {"item2", new List<int> {4, 5, 6}},
                                    {"item3", new List<int> {1, 2, 3}}
                                };
List<int> sourceList = new List<int> {1, 2, 3};

Search for indexes:

var indexes = refDict.Values
    .Select((list, index) => list.SequenceEqual(sourceList) ? index : -1)
    .Where(x => x >= 0);

Search for keys:

var keys = refDict
    .Where(item => item.Value.SequenceEqual(sourceList))
    .Select(item => item.Key);

Answer 2

var list = new List<int> { 1,2,3 };
var dico = new Dictionary<string, List<int>>();

dico.Add("A", list);
dico.Add("B", new List<int> { 2,3 });
dico.Add("C", new List<int> { 1,2,3 });

var keys = dico.Where (d => d.Value.SequenceEqual(list)).Select (d => d.Key);

Pay attention that this wil return "A" and "C" !!!