James Montemagno@JamesMontemagnoPrincipal PM – Xamarin, Microsoft

.NET Standard Libraries + Xamarin

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Shared C# codebase • 100% native API access • High performance

iOS C# UI

Windows C# UIAndroid C# UI

Shared C# Mobile

C# Server

Linux/MonoCoreCLRAzure

Shared C# Client/Server

Xamarin’s Unique Approach

• Product -> .NET on Windows/Linux/macOS• .NET Core Runtime• Implements the .NET Standard Library 1.6• Same as ASP.NET Core or the .NET

Framework

What is .NET Core?

https://www.microsoft.com/net/core

• Specification of .NET APIs for .NET Runtimes• Developers products portable libraries

usable across .NET Runtimes• Reduces/Eliminates conditional compilation

of shared source• Offers different “netstandard” profiles for

platform support

What is .NET Standard?

https://docs.microsoft.com/en-us/dotnet/articles/standard/library

.NET Platforms Support

API Contracts

• Similarities• Defines APIs that can be used for code sharing

• Differences• .NET Standard Library is a curate set of APIs (not an

intersection)• .NET Standard Library has linear versions (PCLs profiles do

not)• PCL profiles represent MS platforms, while the .NET

Standard Library is independent of the platform.

Comparison to Portable Class Libraries

https://docs.microsoft.com/en-us/dotnet/articles/standard/library

PCL Compatibility

Thank you.

JamesMontemagnoPrincipal Program Manager – Xamarin,

jamont@microsoft.com motzcod.es @JamesMontemagno

Questions?