我一直在寻找相当一段时间寻找这方面的一些方向..无法找到答案。Postgres&C#:无法加载类型Npgsql.NpgsqlConnectionFactory
尝试通过使用.net实体框架连接到PostgreSQL(似乎是合理的,而不是围绕普通的sql连接方法编写我自己的框架)。
在exeecuting的以下几行代码,我得到如下的错误如下:
`using (var db = new dbTestContext())
{
var test = from a in db.dbTest select a;
dataGridView1.DataSource = test.ToList();
}`
我的错误: 外层的异常:
{"Failed to set Database.DefaultConnectionFactory to an instance of the 'Npgsql.NpgsqlConnectionFactory, Npgsql' type as specified in the application configuration. See inner exception for details."}
内部异常:
{"Could not load type 'Npgsql.NpgsqlConnectionFactory' from assembly 'Npgsql'.":"Npgsql.NpgsqlConnectionFactory"}
设置: 我已经从NugetPacka安装了npgsql ge经理 我已经从Nuget包管理器安装Entitiy Framework 6 for npgsql
我有以下App.Config
文件(道歉,我的第一篇文章,仍然试图让格式正确)。
`<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />
</startup>
<entityFramework>
<!--<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />-->
<defaultConnectionFactory type="Npgsql.NpgsqlConnectionFactory, Npgsql" />
<providers>
<!--<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />-->
<provider invariantName="Npgsql" type="Npgsql.NpgsqlServices, EntityFramework6.Npgsql" />
</providers>
</entityFramework>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="Npgsql" publicKeyToken="5d8b90d52f46fda7" culture="neutral" />
<bindingRedirect oldVersion="0.0.0.0-3.2.1.0" newVersion="3.2.1.0" />
</dependentAssembly>
</assemblyBinding>
</runtime>
<system.data>
<DbProviderFactories>
<add name="Npgsql Data Provider" invariant="Npgsql" support="FF" description=".Net Framework Data Provider for Postgresql" type="Npgsql.NpgsqlFactory, Npgsql" />
</DbProviderFactories>
</system.data>
<connectionStrings>
<add name="dbTestConnectionString" connectionString="Server=localhost;Database=dbTest;User Id=postgres;Password=Dve835167!;" providerName="Npgsql" />
</connectionStrings>
</configuration>`
任何方向,将不胜感激
删除以前的文本 –