Mpir.NET lets you use the MPIR library, which is a GMP fork for Windows, from .NET languages. The current version incorporates 32- and 64-bit builds of MPIR 2.7.0.
Install-Package Mpir.NET -Version 0.4.0
dotnet add package Mpir.NET --version 0.4.0
Fixed PowerMod bug.
Upgraded to .NET 4.5
This package has no dependencies.