HttpGet和HttpPost返回驗證錯誤並加載SelectList

我有一個基於ViewModel的表單，它提示用戶將Person的XApplication狀態更改爲Accepted或Rejected。HttpGet和HttpPost返回驗證錯誤並加載SelectList

當我通過POST提交表單時，我想創建一個新的XApplication，然後如果成功將用戶帶回同一頁面。如果它包含錯誤，我希望再次通過傳遞View(personApp)重新載入表單，這將通過剃刀方法@Html.ValidationSummary()顯示錯誤。

但是，當我嘗試這樣做時，View（）不知道我的SelectLists，並且無法使用「應用程序已接受」和「應用程序已拒絕」填充下拉列表。

我可以採取另一種方法嗎？

[Route("student/xApplication/{personId?}")] 
[HttpGet] 
public ActionResult xApplication(int? personId) 
{ 
    if (personId == null) 
    { 
     return new HttpStatusCodeResult(HttpStatusCode.BadRequest); 
    } 
    Person person = db.People.Find(personId); 
    if (person == null) 
    { 
     return HttpNotFound(); 
    } 

    // Prepare ViewModel to pass to view, based on personId 
    PersonViewModel personVModel = new PersonViewModel(); 
    personVModel.Person = person; 

    // Get XApplication Data 
    var xApps = from a in db.XApplications where a.personId == personId select a; 

    XApplication personXApplication = null; 
    if (xApps.Count() > 0) 
    { 
     personXApplication = xApps.First(); 
    } 
    personVModel.XApplications = personXApplication; 

    List<SelectListItem> applicationStatusItems = new List<SelectListItem>(); 
    applicationStatusItems.Add(new SelectListItem { Value = "1", Text = "Application Accepted" }); 
    applicationStatusItems.Add(new SelectListItem { Value = "0", Text = "Application Rejected" }); 
    SelectList applicationStatusList = new SelectList(applicationStatusItems, "Value", "Text", null); 

    personVModel.ApplicationStatusList = applicationStatusList; 

    return View(personVModel); 
} 

[HttpPost] 
[Route("student/xApplication")] 
public ActionResult xApplication(PersonViewModel personVModel) 
{ 
    if (ModelState.IsValid)// Checks no errors 
    { 
     db.XApplications.Add(personVModel.XApplications); 
     db.SaveChanges(); 
     return Redirect("/student/xApplication/" + personVModel.Person.id); 
    } 

    return View(personVModel); 
}

來源

2014-09-26 Danny Cullen

你可以做的是讓視圖模型自己照顧selectlistitem。因此，您不必重新填充控制器中的項目。 – Jamie 2014-09-26 14:50:36

我會給那一個去傑米，是有道理的。 – 2014-09-26 15:07:14

由於SelectList是硬編碼的，我會建議他們產生內PersonViewModel以避免代碼重複。您可以通過移動產生SelectList名爲PopulateApplicationStatusList的公共方法的代碼這樣做，並且把它在構造函數中

public class PersonViewModel 
{ 
    public PersonViewModel() 
    { 
     this.PopulateApplicationStatusList(); 
    } 

    public SelectList ApplicationStatusList { get; set; } 

    public void PopulateApplicationStatusList() 
    { 
     List<SelectListItem> applicationStatusItems = new List<SelectListItem>(); 
     applicationStatusItems.Add(new SelectListItem { Value = "1", Text = "Application Accepted" }); 
     applicationStatusItems.Add(new SelectListItem { Value = "0", Text = "Application Rejected" }); 
     this.ApplicationStatusList = new SelectList(applicationStatusItems, "Value", "Text", null); 
    } 
}

在你取得動作的方法，ApplicationStatusList將產生當您創建的PersonViewModel

一個新實例

[Route("student/xApplication/{personId?}")] 
[HttpGet] 
public ActionResult xApplication(int? personId) 
{ 
    if (personId == null) 
    { 
     return new HttpStatusCodeResult(HttpStatusCode.BadRequest); 
    } 
    Person person = db.People.Find(personId); 
    if (person == null) 
    { 
     return HttpNotFound(); 
    } 

    // Prepare ViewModel to pass to view, based on personId 
    PersonViewModel personVModel = new PersonViewModel(); // ApplicationStatusList is generated here 
    personVModel.Person = person; 

    // Get XApplication Data 
    var xApps = from a in db.XApplications where a.personId == personId select a; 

    XApplication personXApplication = null; 
    if (xApps.Count() > 0) 
    { 
     personXApplication = xApps.First(); 
    } 
    personVModel.XApplications = personXApplication; 

    return View(personVModel); 
}

在您的文章操作方法，你可以重新填充ApplicationStatusList財產通過調用PopulateApplicationStatusList方法

，當有任何錯誤

來源

2014-09-27 07:34:44 ekad

HttpGet和HttpPost返回驗證錯誤並加載SelectList

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