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並前往https://entityframeworkcore.com/knowledge-base/37569990/iservicecollection-does-not-contain-a-definition-or-extension-for-addnpgsql

IServiceCollection does not contain a definition or extension ...

The RC2 driver replaced AddNpgsql with AddEntityFrameworkNpgsql , so replace this code block: services.AddEntityFramework() .AddNpgsql() .

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