Difference between the classes System.StringComparer and System.StringComparison?

Question

What is the difference between these two classes ?

I have used System.StringComparer.OrdinalIgnoreCase() and System.StringComparison.OrdinalIgnore

Answer 1

The question is: why to have in a framework both of them ?

The explanation is this one:

• StringComparison is:

Specifies the culture, case, and sort rules to be used by certain overloads of the String.Compare and String.Equals methods

• StringComparer is:

Represents a string comparison operation that uses specific case and culture-based or ordinal comparison rules

Noticed a difference ?

In second case, so in case of StringComparer there is a notion of string comparison operation, but not string type.

In fact, if you look at this you will read simply:

Some non-string methods that have string comparison as a central operation use the StringComparer type.

An example, from the same link:

Array.BinarySearch(this.storedNames, name, StringComparer.Ordinal)

I use StringComparer like a comparison "base" among content of the array reference type.