MVC-使用ViewModel进行验证(Model.State)
本文关键字:Model State 验证 使用 ViewModel MVC- | 更新日期: 2023-09-27 18:24:17
我需要一些帮助。我有以下情况,我认为我做错了什么。
-模型"状态"
namespace App.Model
{
public class State
{
[Key]
[DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
public int idState { get; set; }
[Required(ErrorMessage = "Initials is required")]
public string StateInitials { get; set; }
[Required(ErrorMessage = "Name is required")]
public string StateName { get; set; }
[Display(Name = "Update Date")]
[DisplayFormat(DataFormatString = "{0:dd/MM/yyyy}")]
public DateTime? UpdateDate { get; set; }
[Display(Name = "Update Responsible")]
public string UpdateResponsible { get; set; }
} //class
} //namespace
-模型"位置"
namespace App.Model
{
public class Location
{
[Key]
[DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)]
public int idLocation { get; set; }
public int idState { get; set; }
[Required(ErrorMessage = "Name is required")]
public string LocationName { get; set; }
public string Status { get; set; }
public string ManagerName { get; set; }
public string Address { get; set; }
[Display(Name = "Update Date")]
[DisplayFormat(DataFormatString = "{0:dd/MM/yyyy}")]
public DateTime? UpdateDate { get; set; }
[Display(Name = "Update Responsible")]
public string UpdateResponsible { get; set; }
} //class
} //namespace
状态和位置之间的关系是一对多的,但我没有在模型中描述这一点(使用导航字段)。
我有一个要编辑位置的视图。为此,我使用以下视图模型。
-查看模型"LocationsViewModel"
namespace App.ViewModel
{
public class LocationsViewModel
{
public State objState { get; set; }
public List<Location> lstLocations { get; set; }
} //class
} //namespace
要编辑位置,我使用以下控制器。
namespace App.Controllers
{
public class LocationController : Controller
{
private DbContext db = new DbContext();
// GET: /Location/Edit/5
public ActionResult Edit(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
State objState = db.States.Find(id);
if (objState == null)
{
return HttpNotFound();
}
LocationsViewModel model = new LocationsViewModel();
model.objState = objState;
model.lstLocations = getLocations(objState.idState); //I didn´t show this method here just to simplify
return View(model);
} //Edit
// POST: /Location/Edit/5
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Editar(LocationsViewModel model)
{
State objState = db.States.Find(model.objState.idState);
try
{
if (ModelState.IsValid)
{
//Saving Locations
foreach (Location obj in model.lstLocations)
{
Location objLocation = db.Locations.Find(obj.idLocation);
objLocation.LocationName = obj.LocationName;
objLocation.Status = obj.Status;
objLocation.ManagerName = obj.ManagerName;
objLocation.Address = obj.Address;
objLocation.UpdateDate = DateTime.Now;
objLocation.UpdateResponsible = User.Identity.Name;
db.Entry(objLocation).State = EntityState.Modified;
db.SaveChanges();
} //foreach
return RedirectToAction("Index");
}
}
catch (Exception e)
{
ModelState.AddModelError("", e.Message);
}
model.objState = objState;
model.lstLocations = getLocations(objState.idState); //I didn´t show this method here just to simplify
return View(model);
} //Edit
} //class
} //namespace
问题是:
我编写此代码是为了编辑(保存)特定州的位置列表。当我提交"编辑"视图时,MVC会尝试验证位置列表(lstLocations)和状态(objState),但我只想验证位置列表。
注意1.我需要将两个对象传递到我的编辑视图:objState和lstLocations。我需要objState对象,因为我在页面(视图)上向用户显示了一些State的属性。
注意2.我得到ModelState.IsValid=false,因为model.objLocation无效,但我不想检查objLocation(与此视图无关)。我只想查看位置列表(lstRocation)
实现我的高尔夫最好的方法是什么?我做错什么了吗?我需要改变我的思维方式吗?
您需要两样东西。第一种方法是从ModelState中删除您不想验证的对象。第二种是,您需要将要在有效状态下执行的代码块放在if(ModelState.IsValid)块中。
public ActionResult Edit(int? id)
{
//don't validate this field
ModelState.Remove("yourObject.property");
if (ModelState.IsValid)
{
...
}
}
除了您已经选择的解决方案之外,我还发现自定义RequiredIfAttribute
非常有用。使用它,你可以控制是否需要基于另一个条件的东西,例如:
...
public bool RequireLocationName {
get {
return !Addresses.Any();
}
}
[RequiredIf("RequireLocationName", true)]
public bool LocationName { get; set; }