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Port TimeZoneInfo cleanups from CoreCLR#2400
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TimeZoneInfo is immutable. Help enforce this by making its fields readonly.
AdjustmentRule is immutable. Help enforce this by making its fields readonly.
TransitionTime is immutable. Help enforce this by making its fields readonly.
There doesn't appear to be a good reason why the TimeZoneInfo.Utc instance needs to be cleared when TimeZoneInfo.ClearCachedData() is called. Instead, we can pre-allocate and reuse a singleton instance, obviating the need for the lazy-initialization/locking mechanics.
It's more efficient to concatenate the strings.
TimeZoneInfo currently always creates a defensive copy of the specified ArgumentRule[] array when created. This makes sense for the public static factory methods. However, there's no need to create a defensive copy of arrays created privately as part of its implementation (e.g. reading the rules from the registry/disk). This change avoids the unnecessary cloning.
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LGTM. thanks a lot @justinvp |
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Contributes to #2388
Ports the following:
dotnet/coreclr#8513(this change was already in CoreRT)dotnet/coreclr#8526
dotnet/coreclr#8527
dotnet/coreclr#8528
dotnet/coreclr#8529
dotnet/coreclr#8530
dotnet/coreclr#8540
dotnet/coreclr#8575
There's one more left to port (dotnet/coreclr#8512) that I'll submit as a separate PR as it requires some minor refactoring in CoreRT to avoid having the Sort code in multiple places in CoreRT (it's only in one place in CoreCLR).
cc: @tarekgh, @DnlHarvey, @jkotas