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Replace a substring in each element of a string array?

Answer 1

+2 A:

You could iterate the array implicitly

arrayOfStrings = arrayOfStrings.Select(s => s.Replace("abc", "xyz")).ToArray();

David Hedlund 2010-09-16 07:47:20

I tried using foreach, can I use it as well? Could make it work so far though...

grady 2010-09-16 07:48:20

Strictly this does not replace elements in the array, it creates a new array with the replaced elements in. This makes i difference if the original arrayOfStrings was referenced elsewhere, like if arrayOfStrings was an in parameter in a method.

Albin Sunnanbo 2010-09-16 07:53:56

@grady you can not use foreach(var s in arrayOfStrings) {s = s.Replace("foo", "bar"); } since you are not allowed to modify the foreach variable.

Albin Sunnanbo 2010-09-16 07:57:19

Answer 2

+5 A:

Ultimately, anything you do is going to do exactly that anyway. A simple for loop should be fine. There are pretty solutions involving lambdas, such as Array.ConvertAll / Enumerable.Select, but tbh it isn't necessary:

for(int i = 0 ; i < arr.Length ; i++) arr[i] = arr[i].Replace("foo","bar");

(the for loop has the most efficient handling for arrays; and foreach isn't an option due to mutating the iterator variable)

Marc Gravell 2010-09-16 07:50:26

Yeah, do the simplest thing - you can't go wrong that way

Jaco Pretorius 2010-09-16 08:16:47

Answer 3

A:

I want to extend this...lets say the array was converted to a List and contains dates as strings after I did the replace stuff. Can I covert those strings to DateTime using List.foreach and only get the latest 12 entries (latest date and downwards).

Thanks

grady 2010-09-16 08:29:16

LINQ... list.OrderByDescending(item => DateTime.Parse(item)).Take(12);

Marc Gravell 2010-09-16 09:28:22

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Replace a substring in each element of a string array?

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