CODEWITHSUNDEEP
c#
John B.
John B.

Reputation: 15

Initializing an array with an existing array and variables

I am trying to create a string array from an existing string and a string array as follows

string[] oldArray = { "Hello", "World" };
string oldString = "test string";
string[] newArray = { oldArray, oldString };

This is, unfortunately, not going to work as written, so I have been trying to come up with a non-iterating method of filling the newArray with the elements of the old. The only solution I have found is to join with an arbitrary character(s) and then split using the same.

string[] arr = {"AString", "BString", "CString" }; // Passed to function
...
string arrAsString = String.Join("$", arr) + "$" + DateTime.Today.ToString("M/dd");
return arrAsString.Split('$');

But this is much slower in my tests than a for loop. Are there any better solutions?

Edit: In response to an answer below: The reason why I was not using List is because I am manipulating cells in Excel, and ranges in the API I am using are returned as arrays

Upvotes: 0

Views: 328

Answers (2)

Tim S.
Tim S.

Reputation: 56536

The only solution I have found is to join with an arbitrary character(s) and then split using the same.

Please don't do it this way! For one, if any of your strings have a $ in them, you'll get unexpected results.

You should probably be using a List<string>. It's much like a string[], but it has a variable size.

var myList = new List<string> { "Hello", "World" };
myList.Add("test string");

Upvotes: 2

Selman Gen&#231;
Selman Gen&#231;

Reputation: 101681

You can try using Concat method:

string[] newArray = oldArray.Concat(new [] { oldString }).ToArray();

Or, use List<T> instead if you don't want a fixed size collection.

Upvotes: 2

Related Questions