.NET Core 3.0 使用dotnet ef时报错问题

.NET Core 3.0中使用dotnet ef migrations add InitialCreate命令，报错如下，Could not execute because the specified command or file was not found. Possible reasons for this include: * You misspelled a built-in dotnet command. * You intended to execute a .NET Core program, but dotnet-ef does not exist. * You intended to run a global tool, but a dotnet-prefixed executable with this name could not be found on the PATH. 执行dotnet命令，可以正常执行，说明PATH正常，本文主要介绍一下解决方法。

原文地址：.NET Core 3.0 使用dotnet ef时报错问题