Entity framework 如何将sqlite与实体框架结合使用?
我正在开发一个桌面应用程序,它应该将数据保存到SQLite数据库中。我想首先使用实体框架代码来实现这一点。但是,我每次都收到错误。这是我的初始app.config:Entity framework 如何将sqlite与实体框架结合使用?,entity-framework,sqlite,entity-framework-6,system.data.sqlite,Entity Framework,Sqlite,Entity Framework 6,System.data.sqlite,我正在开发一个桌面应用程序,它应该将数据保存到SQLite数据库中。我想首先使用实体框架代码来实现这一点。但是,我每次都收到错误。这是我的初始app.config: <?xml version="1.0" encoding="utf-8"?> <configuration> <configSections> <!-- For more information on Entity Framework configuration, visit h
<?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" />
</startup>
<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" type="System.Data.SQLite.EF6.SQLiteProviderServices, System.Data.SQLite.EF6" />
<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.EF6" />
<add name="SQLite Data Provider" 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>
<connectionStrings>
<add name="MyPersonContext" connectionString="Data Source=ali.db" providerName="System.Data.SQLite.EF6" />
</connectionStrings>
</configuration>
这就是我的背景:
class PersonContext : DbContext
{
public PersonContext() :
base("name=MyPersonContext")
{
}
public DbSet<Person> Persons { get; set; }
}
class PersonContext:DbContext
{
public PersonContext():
base(“name=MyPersonContext”)
{
}
公共DbSet Persons{get;set;}
}
我收到这个错误:
System.NotSupportedException was unhandled
HResult=-2146233067
Message=Unable to determine the provider name for provider factory of type 'System.Data.SQLite.SQLiteFactory'. Make sure that the ADO.NET provider is installe or registered in the application config.
Source=EntityFramework
StackTrace:
at System.Data.Entity.Utilities.DbProviderFactoryExtensions.GetProviderInvariantName(DbProviderFactory factory)
at System.Data.Entity.Infrastructure.DependencyResolution.DefaultInvariantNameResolver.GetService(Type type, Object key)
at System.Data.Entity.Infrastructure.DependencyResolution.CachingDependencyResolver.<>c__DisplayClass1.<GetService>b__0(Tuple`2 k)
at System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey key, Func`2 valueFactory)
at System.Data.Entity.Infrastructure.DependencyResolution.CachingDependencyResolver.GetService(Type type, Object key)
at System.Data.Entity.Infrastructure.DependencyResolution.ResolverChain.<>c__DisplayClass3.<GetService>b__0(IDbDependencyResolver r)
at System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext()
at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source, Func`2 predicate)
at System.Data.Entity.Infrastructure.DependencyResolution.ResolverChain.GetService(Type type, Object key)
at System.Data.Entity.Infrastructure.DependencyResolution.RootDependencyResolver.GetService(Type type, Object key)
at System.Data.Entity.Infrastructure.DependencyResolution.ResolverChain.<>c__DisplayClass3.<GetService>b__0(IDbDependencyResolver r)
at System.Linq.Enumerable.WhereSelectArrayIterator`2.MoveNext()
at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source, Func`2 predicate)
at System.Data.Entity.Infrastructure.DependencyResolution.ResolverChain.GetService(Type type, Object key)
at System.Data.Entity.Infrastructure.DependencyResolution.CompositeResolver`2.GetService(Type type, Object key)
at System.Data.Entity.Infrastructure.DependencyResolution.DbDependencyResolverExtensions.GetService[T](IDbDependencyResolver resolver, Object key)
at System.Data.Entity.Utilities.DbConnectionExtensions.GetProviderInvariantName(DbConnection connection)
at System.Data.Entity.Internal.InternalConnection.get_ProviderName()
at System.Data.Entity.Internal.LazyInternalConnection.get_ProviderName()
at System.Data.Entity.Internal.LazyInternalContext.get_ProviderName()
at System.Data.Entity.Internal.DefaultModelCacheKeyFactory.Create(DbContext context)
at System.Data.Entity.Internal.LazyInternalContext.InitializeContext()
at System.Data.Entity.Internal.InternalContext.Initialize()
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.GetEnumerator()
at System.Data.Entity.Infrastructure.DbQuery`1.System.Collections.Generic.IEnumerable<TResult>.GetEnumerator()
at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
at WindowsFormsApplication2.Form1.button2_Click(Object sender, EventArgs e) in ...:line 51
at System.Windows.Forms.Control.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnClick(EventArgs e)
at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
at System.Windows.Forms.Control.WndProc(Message& m)
at System.Windows.Forms.ButtonBase.WndProc(Message& m)
at System.Windows.Forms.Button.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID Int32 reason, Int32 pvLoopData)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
at System.Windows.Forms.Application.Run(Form mainForm)
at WindowsFormsApplication2.Program.Main() in ...:line 19
at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
InnerException:
System.NotSupportedException未处理
HResult=-2146233067
Message=无法确定“System.Data.SQLite.SQLiteFactory”类型的提供程序工厂的提供程序名称。确保ADO.NET提供程序已安装或已在应用程序配置中注册。
Source=EntityFramework
堆栈跟踪:
位于System.Data.Entity.Utilities.DbProviderFactoryExtensions.GetProviderInvariantName(DbProviderFactory工厂)
位于System.Data.Entity.Infrastructure.DependencyResolution.DefaultInvariantNameResolver.GetService(类型,对象键)
在System.Data.Entity.Infrastructure.DependencyResolution.CachingDependencyResolver.c__DisplayClass1.b__0(元组'2k)
位于System.Collections.Concurrent.ConcurrentDictionary`2.GetOrAdd(TKey,Func`2 valueFactory)
位于System.Data.Entity.Infrastructure.DependencyResolution.CachingDependencyResolver.GetService(类型,对象键)
在System.Data.Entity.Infrastructure.DependencyResolution.ResolverCain.c_uuDisplayClass3.b_uu0(IDBDendencyResolver)
在System.Linq.Enumerable.WhereSelectArrayInterator`2.MoveNext()中
在System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1源,Func`2谓词)
位于System.Data.Entity.Infrastructure.DependencyResolution.ResolverCain.GetService(类型,对象键)
位于System.Data.Entity.Infrastructure.DependencyResolver.RootDependencyResolver.GetService(类型,对象键)
在System.Data.Entity.Infrastructure.DependencyResolution.ResolverCain.c_uuDisplayClass3.b_uu0(IDBDendencyResolver)
在System.Linq.Enumerable.WhereSelectArrayInterator`2.MoveNext()中
在System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1源,Func`2谓词)
位于System.Data.Entity.Infrastructure.DependencyResolution.ResolverCain.GetService(类型,对象键)
位于System.Data.Entity.Infrastructure.DependencyResolution.CompositeResolver`2.GetService(类型,对象键)
位于System.Data.Entity.Infrastructure.DependencySolveResolution.DbDependencySolveRextensions.GetService[T](IDBDendencySolver解析器,对象键)
位于System.Data.Entity.Utilities.DbConnectionExtensions.GetProviderInvariantName(DbConnection连接)
在System.Data.Entity.Internal.InternalConnection.get_ProviderName()中
在System.Data.Entity.Internal.LazyInternalConnection.get_ProviderName()中
在System.Data.Entity.Internal.LazyInternalContext.get_ProviderName()中
位于System.Data.Entity.Internal.DefaultModelCacheKeyFactory.Create(DbContext上下文)
在System.Data.Entity.Internal.LazyInternalContext.InitializeContext()中
位于System.Data.Entity.Internal.InternalContext.Initialize()处
位于System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(类型entityType)
位于System.Data.Entity.Internal.Linq.InternalSet`1.Initialize()
位于System.Data.Entity.Internal.Linq.InternalSet`1.GetEnumerator()处
位于System.Data.Entity.Infrastructure.DbQuery`1.System.Collections.Generic.IEnumerable.GetEnumerator()
位于System.Collections.Generic.List`1..ctor(IEnumerable`1集合)
at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
在WindowsFormsApplication2.Form1.button2中,单击…:第51行中的(对象发送者,事件参数e)
在System.Windows.Forms.Control.OnClick(EventArgs e)中
在System.Windows.Forms.Button.OnClick(EventArgs e)中
在System.Windows.Forms.Button.OnMouseUp(MouseEventArgs-mevent)上
在System.Windows.Forms.Control.WmMouseUp(Message&m、MouseButtons按钮、Int32单击)
位于System.Windows.Forms.Control.WndProc(Message&m)
位于System.Windows.Forms.ButtonBase.WndProc(Message&m)
在System.Windows.Forms.Button.WndProc(Message&m)中
在System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message&m)中
在System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message&m)中
在System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd、Int32 msg、IntPtr wparam、IntPtr lparam)
在System.Windows.Forms.UnsafentiveMethods.DispatchMessageW(MSG&MSG)中
位于System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafentiveMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID Int32 reason,Int32 pvLoopData)
位于System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32原因,ApplicationContext上下文)
位于System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32原因,ApplicationContext上下文)
在System.Windows.Forms.Application.Run(Form mainForm)中
在WindowsFormsApplication2.Program.Main()中的…:第19行
位于System.AppDomain.\u nExecuteAssembly(RuntimeAssembly程序集,字符串[]args)
位于System.AppDomain.ExecuteAssembly(字符串汇编文件、证据汇编安全性、字符串[]args)
在Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()上
位于System.Threading.ThreadHelper.ThreadStart\u上下文(对象状态)
位于System.Threading.ExecutionContext.RunInternal(ExecutionContext ExecutionContext、ContextCallback回调、对象状态、布尔值preserveSyncCtx)
在System.Threading.ExecutionContext.Run(ExecutionContext ExecutionContext,ContextCallback回调,对象状态,布尔保存SyncCTX)
在System.Threading.ExecutionContext.Run(ExecutionContext ExecutionContext,ContextCallback回调,对象状态)
在System.Threading。