i need a Key/Value List with more than one Value per Key!
What i have tried:
SortedList<string,List<int>> MyList = new SortedList<string,List<int>>();
But the Problem is that i cannot add values to the List in the SortedList dynamicly?
foreach(var item in MyData) { MyList.Add(item.Key,item.Value ????); }
How can i solve this problem? Is there allready a list with this features?
Regards rubiktubik
To complement Kirill's valid suggestion of using a Lookup:
var lookup = MyData.ToLookup(item => item.Key);
and then
foreach (var entry in lookup)
{
string key = entry.Key;
IEnumerable<int> items = entry;
foreach (int value in items)
{
...
}
}
Look at Lookup(Of TKey, TElement) class, which
Represents a collection of keys each mapped to one or more values.
Alternatively to the ILookup, you can use a Dictionary<string,List<int>>.
When adding/setting an item you should check if there is a list for that Key or not:
Dictionary<string,List<int>> MyList;
void AddItem(string key, int value){
List<int> values;
if(!MyList.TryGet(key, values)){
values= new List<int>();
MyList.Add(key, values);
}
values.Add(value);
}
Iterating through the items is:
foreach (var entry in MyList)
{
string key = entry.Key;
List<int> values = entry.Value;
}
If the values for a key should be unique than instead of a List you can use a HashSet.
