1、在路径:C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config 找到machine.config
对其进行增加:<DbProviderFoctories>
<add name="Npgsql Data Provider" invariant="Npgsql" support = "FF"
description=".Net Framework Data Provider for Postgresql server" type="Npgsql.NpgsqlFactory, Npgsql, Version=2.0.11.91, Culture=neutral, PublicKeyToken=5d8b90d52f46fda7"/>

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