Getting a List<Items> out of List<List<Items>>-CodePudding

I have a object called Items. I use that object like so.

List<List<Items>> myItems = new List<List<Items>>();

I want to know how to get a specific List<Items> out of the List<List<Items>> object. Currently I am using foreach loops with some rules to find a specific List<Items>

Any help would be appreciated.

This is currently what I am doing

foreach (List<Items> db2Items in db2Data)
{
     foreach (List<Items> apiItems in apiData)
     {
          if (db2Items[0].Value == apiItems[0].Value && db2Items[27].Value == apiItems[27].Value)
          {
               /// Some other logic here
          }
     }
}

I was wanting to use LINQ to get the matching List<items> out of apiData and if I have a result then do the logic I wanted to do.

CodePudding user response：

It is not really clear how you identify which list within your list you require, but maybe this is the problem?

This is then why a List of lists in such a way is not really very practical. I would suggest to rather use a dictionary of lists.

Dictionary<string, List<Items>> myDict = new Dictionary<string, List<Items><();

The string then is your key (it can be any other type), and then you can just use the key to get the appropriate list

myDict.Add("list 1", list1);
myDict.Add("list 2", list2);
myDict.Add("list 3", list3);

List<Items> foundList = myDict["list 2"];

Or to be a bit safer, use trygetvalue

List<Items> foundList = null;
if (myDict.TryGetValue("list 2", out foundList )) {
   // the key exists in the dictionary.

}

CodePudding user response：

Create a List with the desired items:

List<List<Items>> desiredItems = new List<List<Items>>();

Loop through every item inside your myItems:

        foreach (var item in myItems)
        {
           if (specific rule)
           {
             desiredItems.Add(item)
           }
        }

I think it's this what you want.