Iterate two Arrays with ForEach statement in C#

Question

I have 2 array

string[] Namesvalues = Names.Split(',');
string[] TotalValues = Total.Split(',');

Above both arrays have exactly equal values.what i want to do is to iterate above two arrays in parallel and want to get one by one value from both arrays.

Can any one tell me how can i do that??

"both arrays have exactly equal values", I assume you are saying they have the same number of elements? — Dirk, Jun 30 '14 at 06:54
Wouldn't it be easier to use a normal for loop and use the iterator to access the arrays. After checking the lengths are the same. Assuming you want to compare of use them. — Simeon Pilgrim, Jun 30 '14 at 06:56
You can use typical for loop instead of foreach... any reason you are looking for foreach solution or you just want to iterate? — Adil, Jun 30 '14 at 06:56
[Duplicate](http://stackoverflow.com/questions/1955766/iterate-two-lists-or-arrays-with-one-foreach-statement-in-c-sharp?rq=1) provides answer to your exact question. Note that it may be better to create custom class (Name,Total) instead of 2 separate arrays or simply use `for` loop. — Alexei Levenkov, Jun 30 '14 at 06:57

Tim Schmelter · Accepted Answer · 2014-06-30T07:53:33.967

You could simply use a for-loop:

for(int i = 0; i < NamesValues.Length; i++)
{
    string name = NamesValues[i];
    string totalValue = TotalValues[i];
}

If the length is different you could use ElementAtOrDefault:

for(int i = 0; i < Math.Max(NamesValues.Length, TotalValues.Length) ; i++)
{
    string name = NamesValues.ElementAtOrDefault(i);
    string totalValue = TotalValues.ElementAtOrDefault(i);
}

You also could use Enumerable.Zip to create an anonymous type with both values:

var namesAndValues = NamesValues.Zip(TotalValues, 
    (n, tv) => new { Name = n, TotalValue = tv });
foreach(var nv in namesAndValues)
{
    Console.WriteLine("Name: {0} Value: {1}", nv.Name + nv.TotalValue);
}

Note that the second approach using a for-loop and ElementAtOrDefault is different to to the Enumerable.Zip approach.

The former iterates both arrays completely and ElementAtOrDefault returns null for the value of the smaller array if there is no element at that index.
The latter Zip combines elements only until it reaches the end of one of the sequences.

So when you use Math.Min instead of Math.Max in the for-loop you get a similar behaviour, but then you should use the first approach anyway since there's no need for ElementAtOrDefault.

score 0 · Answer 2 · answered Jun 30 '14 at 06:55

0

//exactly equal length
for (int i = 0; i < Namesvalues.Length; i++)
{
    var name = Namesvalues[i];
    var total = TotalValues[i];
}

answered Jun 30 '14 at 06:55

Robert Fricke

3,637
21
34

Iterate two Arrays with ForEach statement in C#

2 Answers2