在域项目之外访问LINQ to SQL数据上下文

Question

我创建域项目来存储dbml文件和几个域类.我创建单元测试项目来测试CRUD操作.我将域项目引用到测试项目.

我在测试方法中的单元测试中声明了db上下文I try to access method db.SubmitChanges(); but It is not accessible.

但是当单元测试文件存储在域项目中时,db方法是可访问的.

[TestFixture]
class CustomerRepositoryTest
{
    NorthWindDataContext db = new NorthWindDataContext();
    Customer _customer = null;

    [SetUp]
    public void SetUp() {
        //initialize customer
    }

    [Test]
    public void Should_able_to_get_data_when_data_is_inserted()
    {
        db.Customers.InsertOnSubmit(_customer);
        db.SubmitChanges();

        Customer customer = db.Customers.FirstOrDefault(c => c.CustomerID == _customer.CustomerID);

        Assert.AreEqual(customer.CustomerID.Trim(), _customer.CustomerID);
        Assert.AreEqual(customer.ContactName.Trim(), _customer.ContactName);
    }

    [TearDown]
    public void After()
    {
        db.Customers.DeleteOnSubmit(_customer);
        db.SubmitChanges();
    }
}

让我知道如何解决这个问题.

编辑:

Error   1   'AppProject.Domain.NorthWindDataContext' does not contain a definition for 'SubmitChanges' and no extension method 'SubmitChanges' accepting a first argument of type 'AppProject.Domain.NorthWindDataContext' could be found (are you missing a using directive or an assembly reference?) D:\tutorial\dotNET\LINQtoSQL\AppProject.Spec\Should_insert_customer.cs  40  16  AppProject.Spec

Answer 1

您需要System.Data.Linq在测试项目中添加对程序集的引用.创建dbml文件(数据上下文)时,程序集引用将添加到主项目中.为了使用所有LinqToSQL功能,您需要System.Data.Linq在使用DataContext的所有项目中进行引用.