Question

我在以下问题上的问题是,我如何向“Employee”行动发出《示范国家错误》,当时我通过删除“Employee”中的捕获部分。

   public ActionResult Employee(int ID, string Name)
    {
        EmployeeListModel model = new EmployeeListModel (ID, projectName);
        return View(model);
    }

 public ActionResult DeleteEmployee(Employee emp)
    {

        try
        {
            emp.Delete();
            return RedirectToAction("Employee", new { ID = emp.ID, Name = emp.Name });
        }

        catch (Exception e)
        {
            EmployeeListModel model = new EmployeeListModel (emp.ID, emp.Name);
            ModelState.AddModelError("Error", e.Message);
            return RedirectToAction("Employee", model);
        }
    }

“Employee”模式;我仍然无法将身份证和姓名作为参数。

Answer 1

使用<代码>TempData,在多种控制器行动中坚持<代码>ModelState。

MvcContrib有一个行动过滤器。杰里米·Skinner在。来文方的链接被打破,因此我将守则张贴如下。

ModelStateToTempDataAttribute Source Code

/// <summary>
/// When a RedirectToRouteResult is returned from an action, anything in the ViewData.ModelState dictionary will be copied into TempData.
/// When a ViewResultBase is returned from an action, any ModelState entries that were previously copied to TempData will be copied back to the ModelState dictionary.
/// </summary>
public class ModelStateToTempDataAttribute : ActionFilterAttribute
{
    public const string TempDataKey = "__MvcContrib_ValidationFailures__";

    /// <summary>
    /// When a RedirectToRouteResult is returned from an action, anything in the ViewData.ModelState dictionary will be copied into TempData.
    /// When a ViewResultBase is returned from an action, any ModelState entries that were previously copied to TempData will be copied back to the ModelState dictionary.
    /// </summary>
    /// <param name="filterContext"></param>
    public override void OnActionExecuted(ActionExecutedContext filterContext)
    {
        var modelState = filterContext.Controller.ViewData.ModelState;

        var controller = filterContext.Controller;

        if(filterContext.Result is ViewResultBase)
        {
            //If there are failures in tempdata, copy them to the modelstate
            CopyTempDataToModelState(controller.ViewData.ModelState, controller.TempData);
            return;
        }

        //If we re redirecting and there are errors, put them in tempdata instead (so they can later be copied back to modelstate)
        if((filterContext.Result is RedirectToRouteResult || filterContext.Result is RedirectResult) && !modelState.IsValid)
        {
            CopyModelStateToTempData(controller.ViewData.ModelState, controller.TempData);
        }
    }

    private void CopyTempDataToModelState(ModelStateDictionary modelState, TempDataDictionary tempData)
    {
        if(!tempData.ContainsKey(TempDataKey)) return;

        var fromTempData = tempData[TempDataKey] as ModelStateDictionary;
        if(fromTempData == null) return;

        foreach(var pair in fromTempData)
        {
            if (modelState.ContainsKey(pair.Key))
            {
                modelState[pair.Key].Value = pair.Value.Value;

                foreach(var error in pair.Value.Errors)
                {
                    modelState[pair.Key].Errors.Add(error);
                }
            }
            else
            {
                modelState.Add(pair.Key, pair.Value);
            }
        }
    }

    private static void CopyModelStateToTempData(ModelStateDictionary modelState, TempDataDictionary tempData)
    {
        tempData[TempDataKey] = modelState;
    }
}

Here are some similar posts

Answer 2

从这种观点看,示范国家词典是“观点”的一部分,因此试图通过浏览数据,至少在MVC 3(这种方式也采用旧版本)。你们不需要通过这一模式,而是以这种方式加以利用。

However, i don t know if model state errors are retained if you do a redirect; you may want to return the response directly instead:

return View("Employee", model);

HTH.

Answer 3

身份识别和姓名的数值正在由你通过“意见”的“行动结果”中总结:

Model.ID
Model.Name

请注意,@Brian是正确的,因为你需要使用“意见”而不是“反应行动”行动,否则就会丢失模范错误。另一种做法是把你的模式储存在TmData,这实际上是在届会目标周围的一个特殊总结。如果你需要确保适当更新你的遗体,那么你就有必要使用像“再行动”这样的东西。

Answer 4

将示范国家储存在TmData:

TempData["ModelState"] = ModelState;

Then merge the ModelState using an action filter for example:

protected override void OnActionExecuted(ActionExecutedContext context)
{
    filterContext.Controller.ViewData.ModelState.Merge((ModelStateDictionary)TempData["ModelState"]);
}

希望这一帮助。

Answer 5

Try below code //as a best practise always use Viewmodel e.g. employeeViewMode and strongly type your view to viewmodel public class EmployeviewModel { public int id; public string name; public string errormessage; } public ActionResult Employee(int ID) { EmployeeListModel model = new EmployeeListModel(ID, projectName); EmployeviewModel vm = new EmployeviewModel(); vm.id = model.id; vm.name = model.name; if (TempData.Keys.Count() > 0) { vm.errormessage = TempData["errormessage"]; } return View(vm); }

    public ActionResult DeleteEmployee(Employee emp)
    {
        try
        {
            emp.Delete();
            return RedirectToAction("Employee", new { ID = emp.ID, Name = emp.Name });
        }

        catch (Exception e)
        {
            //use TempData to store error message
            TempData["ErrorMessage"] = e.message;
            return RedirectToAction("Employee", emp.ID);
        }
    }

ModelStateToTempDataAttribute Source Code

Here are some similar posts

友情链接