How to make String.Contains case insensitive?

Question

How can I make the following case insensitive?

myString1.Contains("AbC") 

Answer 1

You can create your own extension method to do this:

 public static bool Contains(this string source, string toCheck, StringComparison comp) { return source != null && toCheck != null && source.IndexOf(toCheck, comp) >= 0; } 

And then call:

  mystring.Contains(myStringToCheck, StringComparison.OrdinalIgnoreCase); 

Answer 2

You can use:

 if (myString1.IndexOf("AbC", StringComparison.OrdinalIgnoreCase) >=0) { //... } 

This works with any version of .NET.

Answer 3

 bool b = list.Contains("Hello", StringComparer.CurrentCultureIgnoreCase); 

[EDIT] extension code:

 public static bool Contains(this string source, string cont , StringComparison compare) { return source.IndexOf(cont, compare) >= 0; } 

That might work :)