Let's say I have these two arrays:
string[] arr1 = new string[2]{"Hello", "Stack"}
string[] arr2 = new string[2]{"Stack", "Overflow"}
How would I merge them to get a third array like so: string[3]{"Hello", "Stack", "Overflow"}?
Add a comment
|
4 Answers
string[] arr1 = new string[2]{"Hello", "Stack"};
string[] arr2 = new string[2] { "Stack", "Overflow" };
var arr3 = arr1.Union(arr2).ToArray<string>();
3 Comments
jrista
Note that this requires .NET 3.5 and LINQ.
Marc Gravell
@jrista - strictly speaking, not quite true. It could be any C# 3.0 compiler targetting .NET 2.0 with (for example) LINQBridge. No .NET 3.5 requirement. And if you roll your own extension method it could go anywhere, so there would be no mention of "LINQ", even in the
using directives.jrista
@Mark: Sure, strictly speaking. However, for the average .NET programmer, I think my statement holds true and is perfectly acceptable. (I think more people would upgrade to .NET 3.5 before they choose some third-party framework like LINQBridge or roll their own in-house framework...)
string[] arr3 = arr1.Union(arr2).ToArray();
(if you have LINQ and a using System.Linq; directive)
Comments
ar2.Union<string>(ar1, StringComparer.CurrentCultureIgnoreCase).ToArray<string>();
Comments
Old way of doing this
List<string> temp = arr1.ToList<string>();
foreach (string s in arr1)
{
if (!arr2.Contains(s))
{
temp.Add(s);
}
}
String[] arr3 = temp.ToArray<string>();
New and better way, using .Net Framework 3.5 + LINQ
string[] arr3 = arr1.Union(arr2).ToArray();
1 Comment
Ahmad Mageed
For the "old way"
ToList isn't available. Use List<string> temp = new List<string>(arr1); instead.