Could not load file or assembly 'Microsoft.Extensions.Hosting.Abstractions, Version=3.1.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'.

解决方法

Try deleting the bin folder and rebuilding the solution.

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原文地址：https://www.cnblogs.com/dupeng0811/p/aspnetcore-abstractions-could-not-load.html