“System.Data.EntityException : System.Data.EntityException :
the underlying provider Failed on open. cannot open database
“DBEntities” requested by the login. The login Failed.”.

并且首先执行test2,则test1将失败并显示相同的消息.

过去3天我一直在这里.

[TestClass]
class MyTestClass 
{

    DBEntities db;

    [TestInitialize]
    public void Initializer()
    {
       db = new DBEntities(); 
    }

    [TestMethod]
    public void test1()
    {
       db.Books.Add(new Book{ ...});
       db.SaveChanges();

    }

    [TestMethod]
    public void test2()
    {
       db.Books.Add(new Book{ ...});
       db.SaveChanges();
    }


    [TestCleanup]
    public void Clean()
    {
       db.Dispose(); 
    }

}

以下是DBEntities类的摘录：

public class DBEntities : DbContext
{
    public DbSet<Books> TheBooks{get;set;}
    ...
}

运行分析器后,我注意到这个消息：

“Login Failed for user. Reason: Failed to open the explicitly specified database.”

经过很多lockAcquired和lockReleased语句.