How to loop two c# List parallelly

Question

Hi,

I have two lists - list1 and list2. i want to concatinate list 1 item + list 2 item and save to txt file.below code is not working how we can loop parellely?

foreach (string code in List1)
{
    for (int i = 0; i < List2.Count; i++)
    {
        if (code != "")
        {
            string total = code + ", " + "'" + List2[i] + "')";
            fullcode.Add(total);
        }
    }
}

Muhammad Imran Ansari · Answer

Check the following code: List string > list1 = new List string >() { "hello" , "hai" , "how" , "hey" }; List string > list2 = new List string >() { "bro" , "joy" , "sam" , "don" }; if (list1.Count == list2.Count) { string data = "" ; for ( int i = 0; i { data += list1[i] + " " + list2[i] + "," ; } // To remove last ',' data = data.Substring(0, data.Length - 1); // TODO Save data into file } else { Console.WriteLine( "Both lists have identical items." ); }

Sachin Singh · Answer

Use union var finalList= List1.Union(List2).ToList(); var chunks=finalList.Select((x, i) => new { Index = i, Value = x }) .GroupBy(x => x.Index / 2) .Select(x => x.Select(v => v.Value).ToList()) .ToList(); foreach(var item in chunks) { foreach (var grp in item) { grp } }

Sujeet Raman · Answer

sorry i didnt get.. can u show me a sample

Nitin Sontakke · Answer

Okay. Got it. First make sure that both list have identical number of items. If not then device and implement the error handling strategy. Then have second list converted to an array. Traverse the first list and pad corrosponding array location value created from second list. Hope it clarifies.

Sujeet Raman · Answer

List1 ........ hello hai how hey List1 ........ bro joy sam don expecting-hello bro,hai joy

Nitin Sontakke · Answer

May be you should post some sample data and expected output. Also considering sample data, what out put you are getting with above. One suggestion. You can short circuit the foreach loop if code is empty. Check it immediately and continue the code if such is the case.