Pass either List<string> or string[ ] array to a C# method

Question

I have the following method in my C# class.

For the parameter called 'collections' I would like to have the flexibility of either passing a List or string[ ] array. I know I could simply set the parameter type as object type, but is there any other more efficient type I could use to do this?

public string ProcessDoc(List<string> collections, string userName)
{
  //code goes here
   string result = null;
   ...
   ...
   return result;
}

Community · Accepted Answer · 2017-05-23 12:00:10Z

7

You could use IList<string>:

public string ProcessDoc(IList<string> collections, string userName)
{
  //code goes here
   string result = null;
   ...
   ...
   return result;
}

Why array implements IList?

edited May 23, 2017 at 12:00

CommunityBot

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answered Mar 29, 2014 at 16:27

Tim Schmelter

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5 Comments

Sunil Over a year ago

So I could just pass an array like ProcessDoc( new string[] {"x", "y","z"}, "sun") ?

Sunil Over a year ago

Ok. So Array and List implement IList interface, and that is the reason we can use IList in this case. Thanks.

Dialecticus Over a year ago

If indexer is not a requirement then IEnumerable<string> is more encompassing alternative.

Sunil Over a year ago

@Dialecticus, I need the indexer in my C# method.

Tim Schmelter Over a year ago

@Dialecticus: i wanted to give the highest common factor, also IList<string> implements IEnumerable<string>.

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