找不到'MySql.Data.MySqlClient'ADO.NET提供程序的实体框架提供程序

Question

I'm trying to use Entity Framework with MySQL and I get the above error. I have the latest MySQL connector installed.

The full error reads:

No Entity Framework provider found for 'MySql.Data.MySqlClient' ADO.NET provider. Make sure the provider is registered in the 'entityFramework' section of the application config file.

However, I can't find anything that suggests just how you register it in the 'entityFramework' section.

Some other posts ( example ) suggest adding the provider to the system.Data DbProviderFactories section like this:

<DbProviderFactories>
  <add 
    name="MySQL Data Provider"
    invariant="MySql.Data.MySqlClient"
    description=".Net Framework Data Provider for MySQL"
    type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data, 
    Version=6.2.3.0, Culture=neutral, 
    PublicKeyToken=c5687fc88969c44d" />
</DbProviderFactories>

But that doesn't work because it claims that the invariant name is duplicated. And, if I actually iterate through the System.Data.Common.DbProviderFactories I can see the last one is the MySQL provider:

MySQL Data Provider
.Net Framework Data Provider for MySQL
MySql.Data.MySqlClient
MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data, Version=6.6.5.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d

So the provider is there, but EF refuses to use it. Any ideas?

My full config looks like this:

<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>

   <system.data>
   <!--<DbProviderFactories>
   <add 
    name="MySQL Data Provider"
    invariant="MySql.Data.MySqlClient"
    description=".Net Framework Data Provider for MySQL"
    type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data, 
    Version=6.2.3.0, Culture=neutral, 
    PublicKeyToken=c5687fc88969c44d" />
   </DbProviderFactories>-->
</system.data>

<connectionStrings>
    <add name="myContext" connectionString="server=****;User Id=****;password=****;Persist Security Info=True;database=myDb"
  providerName="MySql.Data.MySqlClient" />
</connectionStrings>
<startup>
    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
</startup>

<entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
      <parameters>
        <parameter value="v11.0" />
      </parameters>
    </defaultConnectionFactory>

</entityFramework>

</configuration>

Answer 1

in EF5 or less, all ok. in EF6, you need to use mysql connector 6.8.x, and add DbConfigurationTypeAttribute to you DbContext:

[DbConfigurationType(typeof(MySql.Data.Entity.MySqlEFConfiguration))]
public class DemoContext : DbContext{}

which MySqlEFConfiguration is in MySql.Data.Entity.EF6.dll in 6.8.x. Have a try!

Answer 2

You need to create this section in config (EF 5):

<entityFramework>
  <!-- ... -->
  <providers>
    <provider invariantName="MySql.Data.MySqlClient"
              type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity" />
  </providers>
</entityFramework>

Update: Use this definition for EF 6:

<entityFramework>
  <!-- ... -->
  <providers>
    <provider invariantName="MySql.Data.MySqlClient"
              type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6" />
  </providers>
</entityFramework>

Thanks to elcool .

Answer 3

I just had the same situation when trying to configure Visual Studio Professional 2017 environment with MySQL, ADO.NET (Database First) and EF6.

After going through hell with every connector/NET available, I got it to work with Connector/NET v6.9.10 and following the steps below.

1. Uninstall/remove "Connector/NET" and "MySQL for Visual Studio" if installed.

2. Install "MySQL for Visual Studio" v2.0.5 CTP ( MySQL for Visual Studio ). Note: Install MySQL for Visual Studio before Connector/NET.

3. Install "Connector/NET" v6.9.10 ( Connector/Net ). https://i.stack.imgur.com/XOT1I.jpg Note: I tried using Connector/NET v6.8, v6.10 and v8 first, but none of them worked Here you can find all Connector Versions and Compatibilities with Visual Studio IDEs , but so far this list is inaccurate.

4. Download and Install "EntityFramework" v6.2.0 through NuGet.

5. Add references to C:\\Program Files (x86)\\MySQL\\Connector.NET 6.9.10\\Assemblies\\v4.5\\MySql.Data.dll and C:\\Program Files (x86)\\MySQL\\Connector.NET 6.9.10\\Assemblies\\v4.5\\MySql.Data.Entity.EF6.dll .

6. Add MySQL EF6 provider info inside App.config under entity framework providers as follow:

 <entityFramework> <providers> <provider invariantName="MySql.Data.MySqlClient" type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6" /> </providers> </entityFramework> 

7. Rebuild project.

And that was it. VS2017 was ready to go for me. Hope this works for everybody, as it did for me today.

References :

1. Can't Create Entity Data Model - using MySql and EF6

2. No Entity Framework provider found for 'MySql.Data.MySqlClient' ADO.NET provider

Answer 4

Just adding a summary of versions (since I saw you are trying 6.2 which is way too old)

• For EF4, use Connector/NET 6.6.x (current GA is 6.6.6)
• For EF5, use Connector/NET 6.7.x (current GA is 6.7.4) or Connector/NET 6.8.x (current GA is 6.8.3).
• For EF6, use Connector/NET 6.8.x (current GA is 6.8.3).

Answer 5

I've updated from EntityFramework 5.0 to 6.1 and MySQL connector 6.8.3 and only had to add the attribute to get things going again. Before adding the attribute everything would compile fine but crash at runtime.

[DbConfigurationType(typeof(MySql.Data.Entity.MySqlEFConfiguration))]
public class DemoContext : DbContext{}

Answer 6

I tried every different combination of config string and setup but I finally figured it out. My solution has the source code in one project and tests in another. I was using Entity Framework 6.1.1 and had installed MySql Connector 6.8.3 and MySql for Visual Studio 1.2.3.

The problem was that I had NuGet managing the packages, but only had them included in the main project. The solution was to

1. Right click on the Solution (top level in the solution explorer)
2. Manage Nuget packages for solution
3. Go to Installed tab
4. For all of the EntityFramework related packages (MySql.Data, MySql.Data.Entities, MySql.ConnectorNET.Entity and MySql.ConnectorNET.Data), select them then select the "Manage" button.
5. Enable each package for all projects.

Answer 7

For future reference, here's the official guide on using MySQL Connector/Net with EF 6 which includes all the necessary steps (assemblies, configs, ...etc.): Chapter 10 EF 6 Support

Answer 8

从nuget https://www.nuget.org/packages/MySql.Data.Entity/安装最新版本

Answer 9

In my case, it was a missing reference. When you upgrade to EntityFramework 6, you need to add a reference to the assembly

System.Data.Entity

I think it's because MySql.Data.Entity.EF6 inherits from a bunch of stuff in this assembly, that it did not for previous version of EF.

When your app.config is good and all your references seem fine, it's a solution worth checking.

Answer 10

Nevermind. I noticed that I had EF 6 installed. I removed it and tried EF 5 instead (which NuGet says is the latest stable version) and it started working.

Still, a more useful error message would have been nice!

Answer 11

可能只是在机器配置中安装MySql提供程序（例如通过.net连接器安装程序？默认连接工厂应该类似于“MySql.Data.MySqlClient.MySqlClientFactory，MySql.Data，Version = 6.7.4.0，Culture = neutral， PublicKeyToken = c5687fc88969c44d“我猜......