c# - EntityFramework 测试初始化​​错误 : CREATE DATABASE statement not allowed within multi-statement transaction

Question

我正在尝试构建一个快速测试，每次运行时都会删除并重新创建数据库。我有以下内容:

[TestClass]
public class PocoTest
{
    private TransactionScope _transactionScope;
    private ProjectDataSource _dataSource; 
    private Repository _repository = new Repository();
    private const string _cstring = "Data Source=.;Initial Catalog=test_db;Trusted_Connection=True";

    [TestInitialize]
    public virtual void TestInitialize()
    {
        _dataSource = new ProjectDataSource(_cstring);
        _dataSource.Database.Delete();
        _dataSource.Database.CreateIfNotExists();
        _transactionScope = new TransactionScope();
    }
    [TestMethod]
    public void TestBasicOperations()
    {                
        var item = _repository.AddItem(new Item(){Details = "Test Item"});
        //  AddItem makes a call through the data context to add a set and then calls datacontext.SaveChanges()
    }


    [TestCleanup]
    public void TestCleanup()
    {
        // rollback
        if (_transactionScope != null)
        {
            _transactionScope.Dispose();
        }
    }

但是，当我运行测试时，出现以下错误:

Result Message: Test method Project.Repository.UnitTests.PocoTest.TestBasicOperations threw exception: System.Data.SqlClient.SqlException: CREATE DATABASE statement not allowed within multi-statement transaction.

项目数据源在这里:

public class ProjectDataSource : DbContext, IProjectDataSource
{

    public ProjectDataSource() : base("DefaultConnection")
    {

    }

    public ProjectDataSource(string connectionString) : base(connectionString)
    {

    }

    public DbSet<Set> Sets { get; set; }
}

存储库:

public class Repository : IRepository
{
    private readonly ProjectDataSource _db = new ProjectDataSource();
    public Item AddItem(Item item)
        {
            _db.Items.Add(item);
            _db.SaveChanges();
            return item;
        }
}

为什么会这样？

此外 - 如果它有任何区别 - 如果我在 TestMethod 中注释掉 AddItem 行，则不会发生错误。

Answer 1

您还可以使用 db.Database.ExecuteSqlCommand(TransactionalBehavior.DoNotEnsureTransaction, sqlCommand);

参见 https://stackoverflow.com/a/24344654/375114详情