我正在學習 Asp.net Core 并使用 CRUD 操作、SQL 服務器和使用物體框架構建一個簡單的 Web。當我嘗試構建排序方法時，我在引數員工的這一行中出現此錯誤
return View(this.SortEmployees(employees, SortField, CurrentSortField, SortDirection));
這就是錯誤：
Severity Code Description Project File Line Suppression State
Error CS1503 Argument 1: cannot convert from 'System.Collections.Generic.List<EmployeesApp.Models.Employee>' to 'System.Collections.Generic.List<EmployeesApp.Controllers.Employee>' EmployeesApp
那是我的模型：
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
namespace EmployeesApp.Models
{
[Table("Employee", Schema ="dbo")]
public class Employee
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
[Display(Name ="Employee ID")]
public int EmployeeId { get; set; }
[Required]
[Column(TypeName ="varchar(5)")]
[MaxLength(5)]
[Display(Name ="Employee Number")]
public string EmployeeNumber { get; set; }
[Required]
[Column(TypeName = "varchar(150)")]
[MaxLength(100)]
[Display(Name = "Employee Name")]
public string EmployeeName { get; set; }
[Required]
[DataType(DataType.Date)]
[Display(Name ="Date of Birth")]
[DisplayFormat(DataFormatString = "{0:dd-MMM-yyyy}")]
public DateTime DOB { get; set; }
[Required]
[DataType(DataType.Date)]
[Display(Name = "Hiring Date")]
[DisplayFormat(DataFormatString = "{0:dd-MMM-yyyy}")]
public DateTime HiringDate { get; set; }
[Required]
[Column(TypeName ="decimal(12,2)")]
[Display(Name ="Gross Salary")]
public decimal GrossSalary { get; set; }
[Required]
[Column(TypeName = "decimal(12,2)")]
[Display(Name = "Net Salary")]
public decimal NetSalary { get; set; }
[ForeignKey("Department")]
[Required]
public int DepartmentId { get; set; }
[Display(Name = "Department")]
[NotMapped]
public string DepartmentName { get; set; }
public virtual Department Department { get; set; }
}
}
那是我的控制器：
namespace EmployeesApp.Controllers
{
public enum SortDirection
{
Ascending,
Descending
}
public class Employee : Controller
{
HRDatabaseContext dbContext = new HRDatabaseContext();
public IActionResult Index(string SortField, string CurrentSortField, SortDirection SortDirection)
{
var employees = GetEmployees();
return View(this.SortEmployees(employees, SortField, CurrentSortField, SortDirection));
}
private List<Models.Employee> GetEmployees()
{
return (from Employee in dbContext.Employees
join Department in dbContext.Departments on Employee.DepartmentId equals Department.DepartmentId
select new Models.Employee
{
EmployeeId = Employee.EmployeeId,
EmployeeName = Employee.EmployeeName,
DOB = Employee.DOB,
HiringDate = Employee.HiringDate,
GrossSalary = Employee.GrossSalary,
NetSalary = Employee.NetSalary,
DepartmentId = Employee.DepartmentId,
DepartmentName = Department.DepartmentName
}).ToList();
}
public IActionResult Add()
{
ViewBag.Department = this.dbContext.Departments.ToList();
return View();
}
[HttpPost]
public IActionResult Add(Models.Employee model)
{
ModelState.Remove("EmployeeID");
ModelState.Remove("Department");
ModelState.Remove("DepartmentName");
if (ModelState.IsValid)
{
dbContext.Employees.Add(model);
dbContext.SaveChanges();
return RedirectToAction("Index");
}
ViewBag.Department = dbContext.Departments.ToList();
return View("Add", model);
}
public IActionResult Edit(int ID)
{
HRDatabaseContext dbContext1 = dbContext;
Models.Employee data = dbContext1.Employees.Where(e => e.EmployeeId == ID).FirstOrDefault();
ViewBag.Department = this.dbContext.Departments.ToList();
return View("Add", data);
}
[HttpPost]
public IActionResult Edit(Models.Employee model)
{
ModelState.Remove("EmployeeID");
ModelState.Remove("Department");
ModelState.Remove("DepartmentName");
if (ModelState.IsValid)
{
dbContext.Employees.Update(model);
dbContext.SaveChanges();
return RedirectToAction("Index");
}
ViewBag.Department = dbContext.Departments.ToList();
return View();
}
public IActionResult Delete(int ID)
{
Models.Employee data = this.dbContext.Employees.Where(e => e.EmployeeId == ID).FirstOrDefault();
if (data != null)
{
dbContext.Employees.Remove(data);
dbContext.SaveChanges();
}
return RedirectToAction("Index");
}
private List<Employee> SortEmployees(List<Employee> employees, String sortField, string currentSortField, SortDirection sortDirection)
{
if (string.IsNullOrEmpty(sortField))
{
ViewBag.SortField = "EmployeeNumber";
ViewBag.SortField = SortDirection.Ascending;
}
else
{
if (currentSortField == sortField)
{
ViewBag.SortDirection = sortDirection == SortDirection.Ascending ? SortDirection.Descending : SortDirection.Ascending;
}
else
ViewBag.SortDirection = sortDirection == SortDirection.Ascending;
ViewBag.SortField = sortField;
}
//* create the sorting proccess
var propertyInfo = typeof(Employee).GetProperty(ViewBag.SortField);
if (ViewBag.SortDirection == SortDirection.Ascending)
{
employees = employees.OrderBy(e => propertyInfo.GetValue(e, null)).ToList();
}
else
{
employees = employees.OrderByDescending(e => propertyInfo.GetValue(e, null)).ToList();
}
return employees;
}
}
}
uj5u.com熱心網友回復：
您SortEmployees的控制器中的方法采用 aList<Employee>在這種情況下是 aControllers.Employee而不是Models.Employee您懷疑的 a 。
在這種情況下，最好的解決方案是將控制器重命名EmployeeController為遵循 ASP.NET 約定。在 ASP.NET 中，控制器總是命名為[Name]Controller.
uj5u.com熱心網友回復：
private List<Employee> SortEmployees(List<Employee> employees, String sortField, string currentSortField, SortDirection sortDirection)
{
問題涉及上述SortEmployees方法、其引數和使用EmployeesApp.Controllers.Employee模型回傳的資料，而不是EmployeesApp.Models.Employee. 所以，當呼叫這個方法時，它會顯示這個錯誤。
為了解決這個問題，嘗試修改SortEmployees方法如下：使用Models.Employee
private List<Models.Employee> SortEmployees(List<Models.Employee> employees, String sortField, string currentSortField, SortDirection sortDirection)
{
uj5u.com熱心網友回復：
這是由于模型類名和控制器類名相同，因此沒有選擇正確的模態。在這種情況下，您可以在任何使用它的地方顯式添加 Models.Employee 或重命名控制器名稱或模型名稱本身。
轉載請註明出處，本文鏈接：https://www.uj5u.com/gongcheng/371443.html
標籤：C＃ 网站 asp.net-mvc asp.net核心
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