我正在尝试设置一个带有可移植区域(在单独的项目中)和通用存储库的 asp.net mvc。
我使用 IContext 接口为实现该接口的每个上下文生成数据库:
public class Context : DbContext
{
public List<IContext> Contexts {get;set;}
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
foreach (IContext context in Contexts)
context.Setup(modelBuilder);
}
}
和 IContext 的实现:
public class TaskListContext : Context, IContext
{
public DbSet<Task> Tasks { get; set; }
void IContext.Setup(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Task>().ToTable("Tasks");
modelBuilder.Entity<Task>().HasKey(task => task.Id);
}
}
当我运行此代码时:
Context context = new Context();
context.Contexts = new List<IContext>();
context.Contexts.Add(new ModuleContext());
String assemblyPath = ControllerContext.HttpContext.Server.MapPath(String.Format("~/bin/{0}", "TaskList.dll")); //it is in a seperate project.
Assembly assembly = Assembly.LoadFrom(assemblyPath);
var contexts = from t in assembly.GetExportedTypes()
where typeof(IContext).IsAssignableFrom(t)
select t;
foreach (Type t in contexts)
{
IContext cont = (IContext)Activator.CreateInstance(t);
context.Contexts.Add(cont);
}
context.Database.CreateIfNotExists();
数据库和表按预期创建。
但是当我想用存储库模式查询数据库时,我得到一个错误。
查询:
TaskListRepository Rep = new TaskListRepository();
var task = Rep.FindBy(t => t.Id==2);
存储库:
public class TaskListRepository : GenericRepository<TaskListContext, Task>, ITaskListRepository
{
}
抽象存储库:
public abstract class GenericRepository<C, T> :
IGenericRepository<T>
where T : class
where C : DbContext, new()
{
private C _entities = new C();
public C ConcreteContext
{
get { return _entities; }
set { _entities = value; }
}
public virtual IQueryable<T> GetAll()
{
IQueryable<T> query = _entities.Set<T>();
return query;
}
public IQueryable<T> FindBy(System.Linq.Expressions.Expression<Func<T, bool>> predicate)
{
IQueryable<T> query = _entities.Set<T>().Where(predicate);
return query;
}
public virtual void Add(T entity)
{
_entities.Set<T>().Add(entity);
}
public virtual void Delete(T entity)
{
_entities.Set<T>().Remove(entity);
}
public virtual void Edit(T entity)
{
_entities.Entry(entity).State = System.Data.EntityState.Modified;
}
public virtual void Save()
{
_entities.SaveChanges();
}
}
然后我得到这个错误:
建立与 SQL Server 的连接时发生与网络相关或特定于实例的错误。服务器未找到或无法访问。验证实例名称是否正确以及 SQL Server 是否配置为允许远程连接。(提供者:SQL 网络接口,错误:26 - 错误定位服务器/指定的实例)
堆栈跟踪:
[SqlException (0x80131904): A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)]
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +6351920
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning() +412
System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity) +6366506
System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, Boolean ignoreSniOpenTimeout, TimeoutTimer timeout, SqlConnection owningObject) +180
System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(ServerInfo serverInfo, String newPassword, Boolean redirectedUserInstance, SqlConnection owningObject, SqlConnectionString connectionOptions, TimeoutTimer timeout) +6366917
System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, TimeoutTimer timeout, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) +6366793
System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) +352
System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) +831
System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options) +49
System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject) +6368598
System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject) +78
System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) +2194
System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +89
System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +6372110
System.Data.SqlClient.SqlConnection.Open() +300
System.Data.SqlClient.SqlProviderServices.UsingConnection(SqlConnection sqlConnection, Action`1 act) +132
System.Data.SqlClient.SqlProviderServices.UsingMasterConnection(SqlConnection sqlConnection, Action`1 act) +3981391
System.Data.SqlClient.SqlProviderServices.GetDbProviderManifestToken(DbConnection connection) +10513049
System.Data.Common.DbProviderServices.GetProviderManifestToken(DbConnection connection) +44
[ProviderIncompatibleException: The provider did not return a ProviderManifestToken string.]
System.Data.Common.DbProviderServices.GetProviderManifestToken(DbConnection connection) +11121429
System.Data.Entity.ModelConfiguration.Utilities.DbProviderServicesExtensions.GetProviderManifestTokenChecked(DbProviderServices providerServices, DbConnection connection) +94
[ProviderIncompatibleException: An error occurred while getting provider information from the database. This can be caused by Entity Framework using an incorrect connection string. Check the inner exceptions for details and ensure that the connection string is correct.]
System.Data.Entity.ModelConfiguration.Utilities.DbProviderServicesExtensions.GetProviderManifestTokenChecked(DbProviderServices providerServices, DbConnection connection) +357
System.Data.Entity.ModelConfiguration.Utilities.DbConnectionExtensions.GetProviderInfo(DbConnection connection, DbProviderManifest& providerManifest) +108
System.Data.Entity.DbModelBuilder.Build(DbConnection providerConnection) +118
System.Data.Entity.Internal.LazyInternalContext.CreateModel(LazyInternalContext internalContext) +237
System.Data.Entity.Internal.RetryLazy`2.GetValue(TInput input) +279
System.Data.Entity.Internal.LazyInternalContext.InitializeContext() +888
System.Data.Entity.Internal.InternalContext.Initialize() +50
System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType) +45
System.Data.Entity.Internal.Linq.InternalSet`1.Initialize() +151
System.Data.Entity.Internal.Linq.InternalSet`1.get_InternalContext() +50
System.Data.Entity.Infrastructure.DbQuery`1.System.Linq.IQueryable.get_Provider() +140
System.Linq.Queryable.Where(IQueryable`1 source, Expression`1 predicate) +135
MonackFr.Repository.GenericRepository`2.FindBy(Expression`1 predicate) in D:\code\MonackFr\MonackFr\MonackFr.Library\Repository\GenericRepository.cs:34
MonackFr.Mvc.Areas.TaskList.Controllers.TaskController.Index() in D:\code\MonackFr\MonackFr\MonackFr.Mvc\MonackFr.Mvc\Areas\TaskList\Controllers\TaskController.cs:18
lambda_method(Closure , ControllerBase , Object[] ) +113
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +261
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +39
System.Web.Mvc.Async.<>c__DisplayClass42.<BeginInvokeSynchronousActionMethod>b__41() +34
System.Web.Mvc.Async.<>c__DisplayClass39.<BeginInvokeActionMethodWithFilters>b__33() +129
System.Web.Mvc.Async.<>c__DisplayClass4f.<InvokeActionMethodFilterAsynchronously>b__49() +954935
System.Web.Mvc.Async.<>c__DisplayClass37.<BeginInvokeActionMethodWithFilters>b__36(IAsyncResult asyncResult) +15
System.Web.Mvc.Async.<>c__DisplayClass2a.<BeginInvokeAction>b__20() +33
System.Web.Mvc.Async.<>c__DisplayClass25.<BeginInvokeAction>b__22(IAsyncResult asyncResult) +955452
System.Web.Mvc.<>c__DisplayClass1d.<BeginExecuteCore>b__18(IAsyncResult asyncResult) +28
System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +20
System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +67
System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +20
System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +53
System.Web.Mvc.<>c__DisplayClassb.<BeginProcessRequest>b__4(IAsyncResult asyncResult) +42
System.Web.Mvc.Async.<>c__DisplayClass4.<MakeVoidDelegate>b__3(IAsyncResult ar) +20
System.Web.Mvc.<>c__DisplayClasse.<EndProcessRequest>b__d() +54
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +469
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +375
连接字符串:
<connectionStrings>
<add name="Context" providerName="System.Data.SqlClient" connectionString="Data Source=localhost;Initial Catalog=monackfr;User Id=sa;Password=*******" />
</connectionStrings>
我真的再也看不到了?有谁知道出了什么问题?连接字符串应该是正确的:它正在创建数据库和表。
问候,
威廉