我有一个新的.NET 4.0控制台应用程序，它使用：
到目前为止这是有效的。我可以很好地添加和读取数据库。
现在，当我添加TransactionScope时，如下例所示：
public static void TestInsert()
{
using (TransactionScope scope = new TransactionScope())
{
using (var context = new MyDbContext())
{
// Create a test user
DateTime dt = DateTime.Now;
var user1 = new User { UserID = 1, UserName = "test" };
context.Users.Add(user1); <-- exception occurs here
context.SaveChanges();
}
}
}
当我运行时，我收到错误：
目前不支持在同一交易中使用不同连接字符串的多个同时连接或连接。
似乎即使最新版本的MySql也不喜欢TransactionScope使用EntityFramework。
我希望能够使用事务，尤其是在测试项目中，以便我可以回滚任何更改。
我知道如何解决这个问题或解决它吗？
完整错误信息
System.Data.DataException was unhandled
Message=An exception occurred while initializing the database. See the InnerException for details.
Source=EntityFramework
StackTrace:
at System.Data.Entity.Internal.InternalContext.PerformInitializationAction(Action action)
at System.Data.Entity.Internal.InternalContext.PerformDatabaseInitialization()
at System.Data.Entity.Internal.LazyInternalContext.<InitializeDatabase>b__4(InternalContext c)
at System.Data.Entity.Internal.RetryAction`1.PerformAction(TInput input)
at System.Data.Entity.Internal.LazyInternalContext.InitializeDatabaseAction(Action`1 action)
at System.Data.Entity.Internal.LazyInternalContext.InitializeDatabase()
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.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)
InnerException: System.Data.EntityException
Message=The underlying provider failed on Open.
Source=System.Data.Entity
StackTrace:
at System.Data.EntityClient.EntityConnection.OpenStoreConnectionIf(Boolean openCondition, DbConnection storeConnectionToOpen, DbConnection originalConnection, String exceptionCode, String attemptedOperation, Boolean& closeStoreConnectionOnFailure)
at System.Data.EntityClient.EntityConnection.Open()
at System.Data.Objects.ObjectContext.EnsureConnection()
at System.Data.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption)
at System.Data.Objects.ObjectQuery`1.System.Collections.Generic.IEnumerable<T>.GetEnumerator()
at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source)
at System.Data.Objects.ELinq.ObjectQueryProvider.<GetElementFunction>b__1[TResult](IEnumerable`1 sequence)
at System.Data.Objects.ELinq.ObjectQueryProvider.ExecuteSingle[TResult](IEnumerable`1 query, Expression queryRoot)
at System.Data.Objects.ELinq.ObjectQueryProvider.System.Linq.IQueryProvider.Execute[S](Expression expression)
at System.Data.Entity.Internal.Linq.DbQueryProvider.Execute[TResult](Expression expression)
at System.Linq.Queryable.FirstOrDefault[TSource](IQueryable`1 source)
at System.Data.Entity.Internal.InternalContext.QueryForModelHash()
at System.Data.Entity.Internal.InternalContext.CompatibleWithModel(Boolean throwIfNoMetadata)
at System.Data.Entity.Database.CompatibleWithModel(Boolean throwIfNoMetadata)
at System.Data.Entity.CreateDatabaseIfNotExists`1.InitializeDatabase(TContext context)
at System.Data.Entity.Internal.InternalContext.<>c__DisplayClass5.<PerformDatabaseInitialization>b__3()
at System.Data.Entity.Internal.InternalContext.PerformInitializationAction(Action action)
InnerException: System.NotSupportedException
Message=Multiple simultaneous connections or connections with different connection strings inside the same transaction are not currently supported.
Source=MySql.Data
StackTrace:
at MySql.Data.MySqlClient.MySqlConnection.Open()
at System.Data.EntityClient.EntityConnection.OpenStoreConnectionIf(Boolean openCondition, DbConnection storeConnectionToOpen, DbConnection originalConnection, String exceptionCode, String attemptedOperation, Boolean& closeStoreConnectionOnFailure)
InnerException:
有些课程（没什么复杂的）：
[Table("User")]
public class User
{
public User()
{
}
// Primary key
[Key]
public int UserID { get; set; }
public string UserName { get; set; }
}
public class MyDbContext : DbContext
{
public MyDbContext() : base("DbContext")
{
}
public DbSet<User> Users { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
// Tell Code First to ignore PluralizingTableName convention
// If you keep this convention then the generated tables will have pluralized names.
modelBuilder.Conventions.Remove<PluralizingTableNameConvention>();
}
}
App.config中：
<?xml version="1.0"?>
<configuration>
<connectionStrings>
<clear/>
<add name="DbContext" connectionString="Server=localhost; Database=****; Uid=****; Pwd=****;" providerName="MySql.Data.MySqlClient"/>
</connectionStrings>
<system.data>
<DbProviderFactories>
<remove invariant="MySql.Data.MySqlClient"/>
<add name="MySQL Data Provider" invariant="MySql.Data.MySqlClient" description=".Net Framework Data Provider for MySQL" type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data"/>
</DbProviderFactories>
</system.data>
</configuration>
提前致谢，
丹
答案 0 :(得分：2)
试一试，创建上下文后创建事务。
public static void TestInsert()
{
using (var context = new MyDbContext())
{
using (TransactionScope scope = new TransactionScope())
{
// Create a test user
DateTime dt = DateTime.Now;
var user1 = new User { UserID = 1, UserName = "test" };
context.Users.Add(user1);
context.SaveChanges();
scope.Complete();
}
}
}
答案 1 :(得分：1)