sql-server - 代码优先 Entity Framework 4 : Failing with SQL Authentication

Question

我正在使用 Entity Framework 4 和 CTP 4，到目前为止我真的很喜欢它。当我使用 Windows 身份验证连接到数据库时，它可以正常工作，但当我切换到 SQL 身份验证时，它会失败并显示以下消息。我已为用户授予 sysadmin 角色，其默认数据库是 master。

错误:

This operation requires a connection to the 'master' database. Unable to create a connection to the 'master' database because the original database connection has been opened and credentials have been removed from the connection string. Supply an unopened connection.

有什么想法吗？

...更多错误详细信息:

[InvalidOperationException: This operation requires a connection to the 'master' database. Unable to create a connection to the 'master' database because the original database connection has been opened and credentials have been removed from the connection string. Supply an unopened connection.]
   System.Data.SqlClient.SqlProviderServices.UsingMasterConnection(SqlConnection sqlConnection, Action`1 act) +344
   System.Data.SqlClient.SqlProviderServices.DbDatabaseExists(DbConnection connection, Nullable`1 commandTimeout, StoreItemCollection storeItemCollection) +231
   System.Data.Objects.ObjectContext.DatabaseExists() +84
   System.Data.Entity.Internal.DatabaseOperations.Exists(ObjectContext objectContext) +9
   System.Data.Entity.Infrastructure.Database.Exists() +53
   System.Data.Entity.Infrastructure.RecreateDatabaseIfModelChanges`1.InitializeDatabase(TContext context) +129
   System.Data.Entity.Infrastructure.<>c__DisplayClass2`1.<SetInitializer>b__0(DbContext c) +75
   System.Data.Entity.Infrastructure.Database.Initialize() +207
   System.Data.Entity.Internal.InternalContext.Initialize() +70
   System.Data.Entity.Internal.LazyInternalContext.get_ObjectContext() +9
   System.Data.Entity.Internal.InternalContext.TryUpdateEntitySetMappingsForType(Type entityType) +51
   System.Data.Entity.Internal.InternalContext.UpdateEntitySetMappingsForType(Type entityType) +17
   System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType) +24
   System.Data.Entity.Internal.Linq.EfInternalQuery`1.Initialize() +62
   System.Data.Entity.Internal.Linq.EfInternalQuery`1.get_Provider() +9
   System.Data.Entity.Infrastructure.DbQuery`1.System.Linq.IQueryable.get_Provider() +13
   System.Linq.Queryable.Select(IQueryable`1 source, Expression`1 selector) +63

Answer 1

这对我有用。

   Database.SetInitializer<YourDbContext>(null);

感谢http://social.msdn.microsoft.com/Forums/en/adonetefx/thread/870959ef-5c06-4c3e-b9f8-454346592280