Question

我正在使用Microsoft Fakes代码伪造DBcontext中的实体。我正面临一个问题。 Fake DBSet上的AsNoTracking（）方法返回null。

例如：当Employee实体伪造时，DBContext.Employee.AsNoTracking（）返回null。

解决此问题的任何解决方案都非常有用

提前致谢

Answer 1

这是代码。GetEmployees()返回异常“Value is null”。 AsNoTracking()方法中发生错误。但是如果我删除AsNoTracking()，测试方法就可以了。

[TestMethod]
public void TestGetEmployeesList()
    {
        using (ShimsContext.Create())
        {
            ShimDbSet<Employee> EmployeeSet = new ShimDbSet<Employee>();
            ShimEntities dbShim = new ShimEntities();

            List<Employee> tempEmployeeList = GetEmployeeList();
            EmployeeSet.Bind(tempEmployeeList.AsQueryable());

            dbShim.EmployeeGet = () =>  {   return EmployeeSet.Instance;    };

            Employee employeeTest = new Employee()  {   DB = databaseShim.Instance  };

            List<EmployeeTransfer> employeeList = employeeTest.GetEmployees("TestEmployee");
            Assert.AreEqual(2, employeeList.Count);

        }
    }
public static List<Employee> GetEmployeeList()
    {
        List<Employee> employeeList = new List<Employee>
        {
                new Employee
                {
                    EmployeeId = 1,
                    EmployeeName ="TestEmployee",
                },
                 new  Employee
                {
                    EmployeeId = 2,
                    EmployeeName ="TestEmp",
                }
        };
        return EmployeeList;
    }
public EmployeeData GetEmployees()
    {
        var query = from item in DB.Employee.AsNoTracking()
                        select item;
        var employeeList = query.ToList();

        return employeeList.FirstOrDefault();
    }

Microsoft为Entity Framework伪造代码

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