MVC 错误 - 传入字典的模型项的类型为“System.Collections.Generic.List”

Question

我不知道这个错误是怎么回事：

传入字典的模型项的类型为“System.Collections.Generic.List1[RepositoryExample.Employee]”，但此字典需要“RepositoryExample.Models.IEmployeeManagerRepository”类型的模型项。`

当我转到索引视图时出现错误。我从控制器添加了索引视图，但其中没有代码。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(); 
    }
}

任何想法我做错了什么？我正在尝试遵循本教程中关于存储库模式的示例：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

与：

@model IEnumerable<RepositoryExample.Employee>

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

return View(_repository.ListEmployees());

这就是您应该在视图中的 @model 指令中使用的类型。