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模拟DataServiceQuery<TElement>

wcf-data-services mocking asp.net-mvc

5

FOR · 技术社区 · 17 年前

想象一下ASP。NET MVC应用程序,其中控制器与ADO。NET数据服务,它封装了我们模型的存储(例如,为了方便起见,我们将阅读一份客户列表)。通过引用该服务,我们得到一个从DataServiceContext继承的生成类:

namespace Sample.Services
{
  public partial class MyDataContext : global::System.Data.Services.Client.DataServiceContext
  {
    public MyDataContext(global::System.Uri serviceRoot) : base(serviceRoot) { /* ... */ }

    public global::System.Data.Services.Client.DataServiceQuery<Customer> Customers
    {
      get
      {
        if((this._Customers==null))
        {
          this._Customers = base.CreateQuery<Customer>("Customers");
        }
        return this._Customers;
      }
    }
    /* and many more members */
  }
}

namespace Sample.Controllers
{
  public class CustomerController : Controller
  {
    private IMyDataContext context;

    public CustomerController(IMyDataContext context)
    {
      this.context=context;
    }

    public ActionResult Index() { return View(context.Customers); }
  }
}

[TestFixture]
public class TestCustomerController
{
  [Test]
  public void Test_Index()
  {
    MockContext mockContext = new MockContext();
    CustomerController controller = new CustomerController(mockContext);

    var customersToReturn = new List<Customer>
    {
      new Customer{ Id=1, Name="Fred" },
      new Customer{ Id=2, Name="Wilma" }
    };
    mockContext.CustomersToReturn = customersToReturn;

    var result = controller.Index() as ViewResult;

    var models = result.ViewData.Model;

    //Now we have to compare the Customers in models with those in customersToReturn,
    //Maybe by loopping over them?
    foreach(Customer c in models) //*** LINE A ***
    {
      //TODO: compare with the Customer in the same position from customersToreturn
    }
  }
}

namespace Sample.Services
{
  public interface IMyDataContext
  {
    DataServiceQuery<Customer> Customers { get; }
    /* and more */
  }
}

public class MockContext : IMyDataContext
{
  public IList<Customer> CustomersToReturn { set; private get; }

  public DataServiceQuery<Customer> Customers { get { /* ??? */ } }
}

在Customers getter中,我们想实例化一个DataServiceQuery实例,用CustomersToReaturn中的Customers填充它,并返回它。我遇到的问题是:

MSDN

2.

namespace Sample.Tests.Controllers.Mocks
{
  public class MockContext : DataServiceContext, IMyDataContext
  {
    public MockContext() :base(new Uri("http://www.contoso.com")) { }

    public IList<Customer> CustomersToReturn { set; private get; }

    public DataServiceQuery<Customer> Customers
    {
      get
      {
        var query = CreateQuery<Customer>("Customers");
        query.Concat(CustomersToReturn.AsEnumerable<Customer>());
        return query;
      }
    }
  }
}

http://www.contoso.com 不提供我们的服务。即使LINE A试图获取模型中的元素数量,也会触发相同的错误。提前感谢。

2 回复 | 直到 17 年前

1

0

Dror Helper 17 年前

IDataServiceQuery 有两种实现方式:

DataServiceQueryWrapper
MockDataServiceQuery

然后我使用 ViewModel服务查询 无论我以前在哪里使用 DataServiceQuery .

public interface IDataServiceQuery<TElement> : IQueryable<TElement>, IEnumerable<TElement>, IQueryable, IEnumerable
{
    IDataServiceQuery<TElement> Expand(string path);

    IDataServiceQuery<TElement> IncludeTotalCount();

    IDataServiceQuery<TElement> AddQueryOption(string name, object value);
}

需要a IQueryable

ViewModel服务查询 方法,我目前刚刚返回 this

// (in DataServiceQueryWrapper.cs)
public IDataServiceQuery<TElement> Expand(string path)
{
    return new DataServiceQueryWrapper<TElement>(_query.Expand(path));
}

// (in MockDataServiceQuery.cs)
public IDataServiceQuery<TElement> Expand(string path)
{
    return this;
}

2

4

dcstraw 16 年前

var fake = Isolate.Fake.Instance<DataServiceQuery>();