c# - EF5 和 Winform 的 MySql 异常

Question

我正在尝试使用 EF5 创建 MySql Db ，因此我有 dbSet 和 My SqlContext 类，但是当我运行程序时会抛出此异常

我的 App.config 中有此代码

<?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=5.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
  </configSections>
  <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>
  <system.data>
    <DbProviderFactories>
      <remove invariant="MySql.Data.MySqlClient"/>
      <add name="MySQL Data Provider" invariant="MySql.Data.MySqlClient" description=".Net Framework Data Provider for MySQL" type="MySql.Data.MySqlClient.MySqlClientFactory,MySql.Data, Version=6.7.4.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" />
    </DbProviderFactories>
  </system.data>
  <connectionStrings>
    <add name="ConnectionStringName" connectionString="server=localhost;Database=auth;uid=root;pwd=1234;" providerName="MySql.Data.MySqlClient" />
  </connectionStrings>
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="MySql.Data" publicKeyToken="c5687fc88969c44d" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-6.7.4.0" newVersion="6.7.4.0" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
</configuration>

和MySqlContext.cs

public class MySqlContext : System.Data.Entity.DbContext
        {
            public System.Data.Entity.DbSet<LoginModel> LoginModel { get; set; }
            //public System.Data.Entity.DbSet<Roles> Roles { get; set; }

            public MySqlContext()
                : base("ConnectionStringName")
            { }
        }

我正在使用 Entity Framework 5、MySqlConector 6.7.4.0、Visual Studio 2012。希望你们能帮助我!

Answer 1

我在user2453734指出的帖子EF5 Getting this error message: Model compatibility cannot be checked because the database does not contain model metadata中找到了答案并在 Program.cs 中的 SetInitializer 中进行了更改，我更改了

这个:

Database.SetInitializer(new DropCreateDatabaseIfModelChanges<MySqlContext>());

进入此:

Database.SetInitializer<MySqlContext>(new DropCreateDatabaseIfModelChanges<MySqlContext>());

现在可以了!