C# Entity Framework : Keyword not supported: 'port'

Question

您好，我有多个项目连接到某个数据库，即 CodeFirst Entity Framework 。

除了一个顽固的项目外，所有项目都能够成功连接。

我得到的错误是:Keyword not supported: 'port'

我浏览了无数的 stackoverflow 问题、mysql 论坛、 Entity Framework 论坛等，包括:

MappingException Edm.String not compatible with SqlServer.varbinary

Keyword not supported in MySQL's connection string

Keyword not supported: 'metadata' + MySQL

我的连接字符串如下所示:server=myservername;port=3306;uid=myaccount;database=mydb;pwd=mypwd123

我的 db.cs 文件如下所示:

public partial class MyDB : DbContext
{
    public MyDB ()
        : base("server=myservername;port=3306;uid=myaccount;database=mydb;pwd=mypwd123")
    {
        Logger.Trace("test123");
    }

    public virtual DbSet<MyItem> MyItems { 
get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Entity<MyItem>()
            .Property(e => e.Content)
            .IsUnicode(false);
    }
}

当我从连接字符串中删除 port:3306 时，我得到了这个:

System.Data.Entity.Core.MappingException: Schema specified is not valid. Errors: 
(8,12) : error 2019: Member Mapping specified is not valid. The type 'Edm.DateTime[Nullable=False,DefaultValue=,Precision=]' of member 'Time' in type 'something.Model.MyItem' is not compatible with 'SqlServer.timestamp[Nullable=False,DefaultValue=,MaxLength=8,FixedLength=True,StoreGeneratedPattern=Identity]' of member 'time' in type 'CodeFirstDatabaseSchema.MyItem'.
   at System.Data.Entity.Core.Mapping.StorageMappingItemCollection.Init(EdmItemCollection edmCollection, StoreItemCollection storeCollection, IEnumerable`1 xmlReaders, IList`1 filePaths, Boolean throwOnError)
   at System.Data.Entity.Core.Mapping.StorageMappingItemCollection..ctor(EdmItemCollection edmCollection, StoreItemCollection storeCollection, IEnumerable`1 xmlReaders)
   at System.Data.Entity.ModelConfiguration.Edm.DbDatabaseMappingExtensions.ToStorageMappingItemCollection(DbDatabaseMapping databaseMapping, EdmItemCollection itemCollection, StoreItemCollection storeItemCollection)
   at System.Data.Entity.ModelConfiguration.Edm.DbDatabaseMappingExtensions.ToMetadataWorkspace(DbDatabaseMapping databaseMapping)
   at System.Data.Entity.Internal.CodeFirstCachedMetadataWorkspace..ctor(DbDatabaseMapping databaseMapping)
   at System.Data.Entity.Infrastructure.DbCompiledModel..ctor(DbModel model)
   at System.Data.Entity.Internal.LazyInternalContext.CreateModel(LazyInternalContext internalContext)
   at System.Data.Entity.Internal.RetryLazy`2.GetValue(TInput input)
   at System.Data.Entity.Internal.LazyInternalContext.InitializeContext()
   at System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType)
   at System.Data.Entity.Internal.Linq.InternalSet`1.Initialize()
   at System.Data.Entity.Internal.Linq.InternalSet`1.get_InternalContext()
   at System.Data.Entity.Internal.Linq.InternalSet`1.ActOnSet(Action action, EntityState newState, Object entity, String methodName)
   at System.Data.Entity.Internal.Linq.InternalSet`1.Add(Object entity)
   at System.Data.Entity.DbSet`1.Add(TEntity entity)
   at MyFunction(Int32 userId, String id, String type, String contentJsonString) in 

我正在使用 MySql Connector 而不是 Sql Server...

我和我团队的其他人都被这个问题彻底难住了。

编辑:这是我的 Web.Config

    <?xml version="1.0"?>
    <configuration>
      <configSections>
        <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false"/>
      </configSections>
      <appSettings file="config-sources\app-settings.config"/>
      <system.web>
        <compilation debug="true" targetFramework="4.5.2">
          <assemblies>
            <add assembly="System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
          </assemblies>
        </compilation>
        <httpRuntime targetFramework="4.5.1"/>
      </system.web>
      <connectionStrings configSource="config-sources\ef-connection-strings.config"/>
      <runtime>
        <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
          <dependentAssembly>
            <assemblyIdentity name="MySql.Data" publicKeyToken="C5687FC88969C44D" culture="neutral" />
            <bindingRedirect oldVersion="0.0.0.0-6.8.3.0" newVersion="6.8.3.0" />
          </dependentAssembly>
          <dependentAssembly>
            <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed" culture="neutral"/>
            <bindingRedirect oldVersion="0.0.0.0-8.0.0.0" newVersion="8.0.0.0"/>
          </dependentAssembly>
          <dependentAssembly>
            <assemblyIdentity name="Autofac" publicKeyToken="17863af14b0044da" culture="neutral"/>
            <bindingRedirect oldVersion="0.0.0.0-3.3.0.0" newVersion="3.3.0.0"/>
          </dependentAssembly>
          <dependentAssembly>
            <assemblyIdentity name="EntityFramework" publicKeyToken="b77a5c561934e089" culture="neutral"/>
            <bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0"/>
          </dependentAssembly>
          <dependentAssembly>
            <assemblyIdentity name="System.Net.Http.Primitives" publicKeyToken="b03f5f7f11d50a3a" culture="neutral"/>
            <bindingRedirect oldVersion="0.0.0.0-4.2.29.0" newVersion="4.2.29.0"/>
          </dependentAssembly>
        </assemblyBinding>
      </runtime>
      <entityFramework>
        <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
        <providers>
          <provider invariantName="MySql.Data.MySqlClient" type="MySql.Data.MySqlClient.MySqlProviderServices,          MySql.Data.Entity.EF6" />
          <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
        </providers>
      </entityFramework>
      <system.webServer>
        <handlers>
          <remove name="ExtensionlessUrlHandler-Integrated-4.0"/>
          <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="POST,HEAD,GET" type="System.Web.Handlers.TransferRequestHandler" resourceType="Unspecified" requireAccess="Script" preCondition="integratedMode,runtimeVersionv4.0" />
        </handlers>
        <security>
          <requestFiltering>
            <verbs>
              <add verb="POST" allowed="true"/>
            </verbs>
          </requestFiltering>
        </security>
        <defaultDocument>
          <files>
            <add value="webhook.ashx"/>
          </files>
        </defaultDocument>
      </system.webServer>
    </configuration> 

Answer 1

所用基DbContext 的参数constructor称为 nameOrConnectionString。因此它支持来自配置文件的连接字符串的名称，或者在您的情况下支持实际的连接字符串。

后者的问题是它不允许像前者一样从配置中指定提供者名称，在这种情况下 EF 使用 defaultConnectionFactory< 中指定的那个 配置元素，在您的例子中是 System.Data.Entity.Infrastructure.SqlConnectionFactory，换句话说 - Sql Server，因此是 port 不支持的异常。

有多种方法可以解决此问题。

(A) 更改defaultConnectionFactory 配置:

<defaultConnectionFactory type="MySql.Data.Entity.MySqlConnectionFactory, MySql.Data.Entity.EF6"></defaultConnectionFactory>

(B) 使用命名配置连接字符串并明确指定提供者:

<connectionStrings>
    <add name="MyDB" providerName="MySql.Data.MySqlClient" connectionString="server=myservername;port=3306;uid=myaccount;database=mydb;pwd=mypwd123" />
</connectionStrings>

并将构造函数更改为

public MyDB()
{
    // ...
}

或者如果名称与您的 DbContext 派生类名称不同:

public MyDB() : base(connection_string_name)
{
    // ...
}

(C) 使用DbConfigurationTypeAttribute :

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