I've following array of strings. Default value of each string is set to string.Empty. And this array is returned by a fuction. Now, I want to print only those indexes that are not null. I can use if-else for each index but it could be very long way for going through 8 items. is there any short way so that I can print only those items that are not nulll
string [] muniSearches = {airSearchReport, certOfOccupancy, emerRepair, fire, fZone,foSearch, health, hsVoilation};
You could use Select and return the provided index if the value is null:
var indexesNotNull = muniSearches.Select((v, i) => new { Value = v, Index = i })
.Where(x => x.Value != null)
.Select(x => x.Index);
Or simply using a for loop:
List<int> indexesNotNull = new List<int>();
for (int index = 0; index < muniSearches.Length; index++)
{
if (muniSearches[index] != null)
{
indexesNotNull.Add(index);
}
}
I wasn't clear whether you wanted values or indexes. If you want values and you can use linq in the context, that's fairly straight forward.
muniSearches
.Where(s => !string.IsNullOrEmpty(s))
.ToList()
.ForEach(Console.WriteLine);
If you want indexes, that's again doable but a little more involed. Something like:
muniSearches
.Select((s, i) => new {value = s, index = i})
.Where(o => !string.IsNullOrEmpty(o.value))
.Select(o => o.index)
.ToList()
.ForEach(Console.WriteLine);
You can check the length of that string using lambda expressions syntax and then store the index of the string having any data in that.
var Indexes = muniSearches.Select((Value, Index) => new { Value , Index })
.Where(x => x.Value.Length > 0)
.Select(x => x.Index);
