【发布时间】：2017-04-03 05:42:47
【问题描述】：
我有一个名为 SalesERPDB 的数据库，我正在尝试创建一个新表“TblEmployee”，但在创建时遇到了异常。
public class SalesERPDB : DbContext
{
public SalesERPDB() : base("SalesERPDB")
{
}
public DbSet<Employee> Employees { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
modelBuilder.Entity<Employee>().ToTable("TblEmployee");
base.OnModelCreating(modelBuilder);
}
}
EmployeeBusinessLayer 类（我有一个 GetEmployees() 方法来获取员工列表）：
public class EmployeeBusinessLayer
{
public List<Employee> GetEmployees()
{
SalesERPDB salesDal = new SalesERPDB();
return salesDal.Employees.ToList(); // Getting an exception in this line.
}
}
员工类：
public class Employee
{
[Key]
public int EmployeeId { get; set; }
public string FName { get; set; }
public string LName { get; set; }
public int Salary { get; set; }
}
我可以从不同的应用程序中访问相同的连接字符串。
连接字符串：
<connectionStrings>
<add name="SalesERPDB" connectionString="Data Source=CSCINDAI406933\\SQLEXPRESS;Initial Catalog=SalesERPDB;Integrated Security=True;" providerName="System.Data.SQLClient"></add>
异常详情：
描述：EntityFramework.dll 中出现“System.InvalidOperationException”类型的异常，但未在用户代码中处理
异常详情：System.InvalidOperationException：实例失败。
堆栈跟踪：[InvalidOperationException：实例失败。]
System.Web.Mvc.Async.c__DisplayClass46.b__3f() +323
System.Data.ProviderBase.DbConnectionPool.TryGetConnection（DbConnection owningObject，TaskCompletionSource1 retry, DbConnectionOptions userOptions, DbConnectionInternal& connection) +78
System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource1 重试，DbConnectionOptions userOptions，DbConnectionInternal oldConnection，DbConnectionInternal& 连接）+191
System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal（DbConnection externalConnection，DbConnectionFactory connectionFactory，TaskCompletionSource1 retry, DbConnectionOptions userOptions) +119
System.Web.Mvc.Async.<>c__DisplayClass33.<BeginInvokeActionMethodWithFilters>b__32(IAsyncResult asyncResult) +44
System.Web.Mvc.Async.WrappedAsyncResult1.CallEndDelegate（IAsyncResult asyncResult）+47
System.Web.Mvc.Async.WrappedAsyncResultBase1.End() +136
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +102
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +50
System.Web.Mvc.Async.<>c__DisplayClass2b.<BeginInvokeAction>b__1c() +72
System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource1 重试，DbConnectionOptions userOptions) +154
System.Data.ProviderBase.DbConnectionClosed.TryOpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource1 retry, DbConnectionOptions userOptions) +21
System.Data.SqlClient.SqlConnection.TryOpenInner(TaskCompletionSource1 retry) +141
System.Data.SqlClient.SqlConnection.TryOpen(TaskCompletionSource1 retry) +362
System.Data.SqlClient.SqlConnection.Open() +96
System.Data.Entity.Infrastructure.Interception.DbConnectionDispatcher.<Open>b__36(DbConnection t, DbConnectionInterceptionContext c) +12
System.Data.Entity.Infrastructure.Interception.InternalDispatcher1.Dispatch(TTarget 目标，Action2 operation, TInterceptionContext interceptionContext, Action3 正在执行，Action3 executed) +72
System.Data.Entity.Infrastructure.Interception.DbConnectionDispatcher.Open(DbConnection connection, DbInterceptionContext interceptionContext) +405
System.Data.Entity.SqlServer.<>c__DisplayClass33.<UsingConnection>b__32() +459
System.Data.Entity.SqlServer.<>c__DisplayClass1.<Execute>b__0() +15
System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute(Func1 操作) +190
System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute（动作操作）+82
System.Data.Entity.SqlServer.SqlProviderServices.UsingConnection（DbConnection sqlConnection，Action1 act) +194
System.Data.Entity.SqlServer.SqlProviderServices.UsingMasterConnection(DbConnection sqlConnection, Action1 行为）+427
System.Data.Entity.SqlServer.SqlProviderServices.CheckDatabaseExists(SqlConnection sqlConnection, Nullable1 commandTimeout, String databaseName) +86
System.Data.Entity.SqlServer.SqlProviderServices.DbDatabaseExists(DbConnection connection, Nullable1 commandTimeout, Lazy1 storeItemCollection) +347
System.Data.Entity.Core.Common.DbProviderServices.DatabaseExists(DbConnection connection, Nullable1 commandTimeout, Lazy1 storeItemCollection) +122
System.Web.Mvc.Async.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult) +185
System.Web.Mvc.Async.WrappedAsyncResult1.CallEndDelegate(IAsyncResult asyncResult) +42
System.Web.Mvc.Async.WrappedAsyncResultBase1.End() +133
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +56
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +40
System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +34
System.Web.Mvc.Async.WrappedAsyncVoid1.CallEndDelegate(IAsyncResult asyncResult) +70
System.Web.Mvc.Async.WrappedAsyncResultBase1.End() +133
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +56
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +37
System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +44
System.Web.Mvc.Controller.<BeginExecute>b__15(IAsyncResult asyncResult, Controller controller) +39
System.Web.Mvc.Async.WrappedAsyncVoid1.CallEndDelegate(IAsyncResult asyncResult) +62
System.Web.Mvc.Async.WrappedAsyncResultBase1.End() +133
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +56
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +37
System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +39
System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +39
System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState) +39
System.Web.Mvc.Async.WrappedAsyncVoid1.CallEndDelegate(IAsyncResult asyncResult) +70
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +133
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, 对象标签) +56
System.Web.Mvc.Async.AsyncResultWrapper.End(IAsyncResult asyncResult, Object tag) +37
System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +40
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult 结果) +38
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9644037
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155
非常感谢修复此问题。提前致谢。
【问题讨论】：
-
用连接字符串更新你的问题
-
@MidhunMundayadan 用 connectionString 更新了问题
标签： c# asp.net-mvc entity-framework