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User info in mailto: URIs is compared

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Previously, Uri didn't compare user info when comparing two Uri instances for equality. However, this behavior is not intuitive in the case of mailto: URIs. With this change, Uri.Equals and the == operator now consider user info when comparing URIs.

Previous behavior

Prior to .NET 8, both of the following comparisons returned true.

Uri uri1 = new Uri("https://user1@www.microsoft.com");
Uri uri2 = new Uri("https://user2@www.microsoft.com");
System.Console.WriteLine(uri1 == uri2); // True.

Uri uri3 = new Uri("mailto:user1@microsoft.com");
Uri uri4 = new Uri("mailto:user2@microsoft.com");
System.Console.WriteLine(uri3 == uri4); // True.

New behavior

Starting in .NET 8, the first comparison still returns true, but the second comparison (of mailto URIs) returns false.

Uri uri1 = new Uri("https://user1@www.microsoft.com");
Uri uri2 = new Uri("https://user2@www.microsoft.com");
System.Console.WriteLine(uri1 == uri2); // True.

Uri uri3 = new Uri("mailto:user1@microsoft.com");
Uri uri4 = new Uri("mailto:user2@microsoft.com");
System.Console.WriteLine(uri3 == uri4); // False.

Version introduced

.NET 8

Type of breaking change

This change is a behavioral change.

Reason for change

The previous behavior was unexpected and unintuitive.

If you want to compare only the host part of email addresses, compare only the Uri.Host members.

Affected APIs