Question

我有一个带有sqlite和实体框架6的小项目。

我按Package Manager Console安装sqlite：PM>Install-Package System.Data.SQLite

在我的web.config：

中

<connectionStrings>
    <remove name="demoSQLiteonnectionString" />
    <add name="demoSQLiteonnectionString" connectionString="Data Source=|App_Data|DemoData.s3db" providerName="System.Data.SQLite.EF6" />
  </connectionStrings>

<entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
      <parameters>
        <parameter value="v11.0" />
      </parameters>
    </defaultConnectionFactory>
    <providers>
      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
      <provider invariantName="System.Data.SQLite.EF6" type="System.Data.SQLite.EF6.SQLiteProviderServices, System.Data.SQLite.EF6" />
    </providers>
  </entityFramework>

<system.data>
    <DbProviderFactories>
      <remove invariant="System.Data.SQLite" />
      <add name="SQLite Data Provider" invariant="System.Data.SQLite" description=".Net Framework Data Provider for SQLite" type="System.Data.SQLite.SQLiteFactory, System.Data.SQLite" />
      <remove invariant="System.Data.SQLite.EF6" />
      <add name="SQLite Data Provider (Entity Framework 6)" invariant="System.Data.SQLite.EF6" description=".Net Framework Data Provider for SQLite (Entity Framework 6)" type="System.Data.SQLite.EF6.SQLiteProviderFactory, System.Data.SQLite.EF6" />
    </DbProviderFactories>
  </system.data>

在我的上下文课程中：

public class DataContext : DbContext
    {
        public DataContext()
            : base("demoSQLiteonnectionString")
        {
            Database.SetInitializer(new CreateDatabaseIfNotExists<DataContext>());
        }

        public DbSet<Client> Client { get; set; }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            // Chinook Database does not pluralize table names
            modelBuilder.Conventions
                .Remove<PluralizingTableNameConvention>();
        }
    }

获取上下文实例时：var context = new DataContext()，

它显示此错误：

Additional information: No Entity Framework provider found for the ADO.NET provider with invariant name 'System.Data.SQLite'. Make sure the provider is registered in the 'entityFramework' section of the application config file. See http://go.microsoft.com/fwlink/?LinkId=260882 for more information.

如何解决这个问题？

Answer 1

您应该将应用配置文件更改为

<providers>
      <provider invariantName="**System.Data.SQLite.EF6**" type="System.Data.SQLite.EF6.SQLiteProviderServices, System.Data.SQLite.EF6" />
    </providers>
</providers>

到

<providers>
          <provider invariantName="**System.Data.SQLite**" type="System.Data.SQLite.EF6.SQLiteProviderServices, System.Data.SQLite.EF6" />
        </providers>
    </providers>

并将配置文件更改为：

public class DataContext : DbContext
    {
        public DataContext()
            : base("demoSQLiteonnectionString")
        {                
        }

        public DbSet<Client> Client { get; set; }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            // Chinook Database does not pluralize table names
            modelBuilder.Conventions
                .Remove<PluralizingTableNameConvention>();
        Database.SetInitializer(new SqliteCreateDatabaseIfNotExists<DataContext>(modelBuilder));
        }
    }

Sqlite不能与Entity Framework 6一起使用

1 个答案: