MVC错误 - 传递到字典中的模型项的类型为'System.Collections.Generic.List`

Question

我无法弄清楚这个错误发生了什么:

传递到字典中的模型项的类型为'System.Collections.Generic.List1 [RepositoryExample.Employee]',但此字典需要类型为'RepositoryExample.Models.IEmployeeManagerRepository'的模型项.

当我进入索引视图时,我收到错误.我从控制器添加了索引视图,但没有代码.我正在使用Linq to SQL.

@model RepositoryExample.Models.IEmployeeManagerRepository

@{
ViewBag.Title = "Index";
}

<h2>Index</h2>

这是我的代码:

EmployeeController.cs

    // GET: /Employee/
    public ActionResult Index()
    {
        return View(_repository.ListEmployees());
    }

LinqEmployeeManagerRepository.cs

public class LinqEmployeeManagerRepository: RepositoryExample.Models.IEmployeeManagerRepository
{
    private DeptDirectoryDataClassesDataContext _db = new DeptDirectoryDataClassesDataContext();

    public Employee GetEmployee(string UserName)
    {
        return (from e in _db.Employees where e.UserName == UserName select e).FirstOrDefault();
    }

    public IEnumerable<Employee> ListEmployees()
    {
        return _db.Employees.ToList();
    }

    public Employee CreateEmployee(Employee employeeToCreate)
    {
        _db.Employees.InsertOnSubmit(employeeToCreate);
        _db.SubmitChanges();
        return employeeToCreate; 
    }

    public Employee EditEmployee(Employee employeeToEdit)
    { 
        var OriginalEmployee = GetEmployee(employeeToEdit.UserName);
        _db.Employees.Attach(employeeToEdit, OriginalEmployee);
        _db.SubmitChanges();
        return employeeToEdit; 
    }

    public void DeleteEmployee(Employee employeeToDelete)
    {
        var OriginalEmployee = GetEmployee(employeeToDelete.UserName);
        _db.Employees.DeleteOnSubmit(OriginalEmployee);
        _db.SubmitChanges();     
    }
}

IEmployeeManagerRepository.cs

namespace RepositoryExample.Models
{
    public interface IEmployeeManagerRepository
    {
        Employee CreateEmployee(Employee employeeToCreate);
        void DeleteEmployee(Employee employeeToDelete);
        Employee EditEmployee(Employee employeeToUpdate);
        Employee GetEmployee(string UserName);
        IEnumerable<Employee> ListEmployees(); 
    }
}

我有什么想法我做错了吗？我正在尝试按照本教程中的Repository模式示例:http://www.asp.net/mvc/tutorials/iteration-4-make-the-application-loosely-coupled-cs.

Answer 1

在您的Index.cshtml视图顶部替换:

@model RepositoryExample.Models.IEmployeeManagerRepository

有:

@model IEnumerable<RepositoryExample.Employee>

该_repository.ListEmployees()方法返回IEnumerable<Employee>,这是您在此处传递给视图的内容:

return View(_repository.ListEmployees());

这是您应该@model在视图中的指令中使用的类型.