• Accessibility improvements in narration, high contrast and focus control areas
• .NET Framework support for .NET Standard 2.0 and compiler features
• More secure SHA-2 support in ASP.NET and System.Messaging
• Configuration builders
• ASP.NET Execution step feature
• ASP.NET HttpCookie parsing
• Enhancements in Visual Tree for WPF applications
• Performance and reliability improvements 

Microsoft .NET Framework 4.7.1 Developer Pack
Microsoft .NET Framework 4.7.1 Offline Installer

Installing And Using .NET 4.7.x, .NET Core 2.0, And C# 7.x With VS 2017 

Compiler – Support for ReadOnlyReferences

class Type1
{
   // This parameter will have an attribute (in IL) of type `IsReadOnly`
   public void Method1(ref readonly int param1) { throw null; }

   // This method return type will have an attribute (in IL) of type `IsReadOnly`
   public ref readonly int Method2() { throw null; }
}

ASP.NET
Values added to System.Web.Cache expire immediately, with .NET Framework 4.7. [452228]

• .NET Framework support for .NET Standard 2.0. 
• More