4.5.1 had several later security patches, including:
While the method existed previously, 4.5.1 was the era where the community really cemented the best practices around ConfigureAwait(false) . The framework was optimized to handle the context switching more efficiently, reducing the overhead of library developers trying to avoid the UI context capture. microsoft dotnet framework 4.5.1
There was a controversial aspect to 4.5.1: It was inextricably linked to Windows 8.1. | Feature | Why interesting | |---------|----------------| |
| Feature | Why interesting | |---------|----------------| | | Enabled “multi-core JIT” — background JIT compilation of startup methods. | | GC.AllocateArray | Allowed zero-initialized array allocation without filling memory if you overwrite immediately. | | ReadOnlySpan<T> precursors | Not public, but internal changes that later made Span<T> possible. | | Better Assembly.LoadFrom | Fewer reflection quirks when loading same assembly from different paths. | | | Better Assembly