C# 对下拉列表的验证已中断_C#_Asp.net_Asp.net Mvc_Asp.net Mvc 5

C# 对下拉列表的验证已中断

c# asp.net asp.net-mvc asp.net-mvc-5

C# 对下拉列表的验证已中断,c#,asp.net,asp.net-mvc,asp.net-mvc-5,C#,Asp.net,Asp.net Mvc,Asp.net Mvc 5,这与从两个下拉列表向局部视图传递模型数据有关，用户必须在视图中选择部门和年份。然后，数字数据显示在局部视图的表格中。该视图包含下拉列表和表格标题。局部视图包含包含数字数据的行。现在，验证失败了。这两个下拉列表都是必需的。如果在未选择下拉列表的情况下提交表单，则会出现以下错误： There is no ViewData item of type 'IEnumerable<SelectListItem>' that has the key 'SelectedDepartment' 当它

这与从两个下拉列表向局部视图传递模型数据有关，用户必须在视图中选择部门和年份。然后，数字数据显示在局部视图的表格中。该视图包含下拉列表和表格标题。局部视图包含包含数字数据的行。现在，验证失败了。这两个下拉列表都是必需的。如果在未选择下拉列表的情况下提交表单，则会出现以下错误：

There is no ViewData item of type 'IEnumerable<SelectListItem>' that has
the key 'SelectedDepartment'

当它击中控制器时，模型状态无效

查看：

@model BudgetDemo.Models.BudgetsActualsViewModel

@using (Html.BeginForm("GetBudgetsActuals", "BudgetsActuals", FormMethod.Post))
{
    @Html.AntiForgeryToken()
    @Html.ValidationSummary(true, "", new { @class = "text-danger" })

    <div class="col-md-6">
        <div class="form-group">
            @Html.DropDownListFor(m => m.SelectedDepartment, Model.Departments, 
                "Select Department", new { @class = "form-control" })
            @Html.ValidationMessageFor(model => model.SelectedDepartment, "", 
                new { @class = "text-danger" })
        </div>
    </div>
    <div class="col-md-6">
        <div class="form-group">
            @Html.DropDownListFor(m => m.SelectedYear, Model.Years, "Select Year", 
                new { @class = "form-control" })
            @Html.ValidationMessageFor(model => model.SelectedYear, "", 
                new { @class = "text-danger" })
        </div>
   </div>

   <div class="form-group">
       <div class="col-lg-7">
           <input type="submit" value="Submit" class="btn btn-info" />
       </div>
   </div>

    @if (Model.SelectedDepartment != null && Model.SelectedYear != null)
    {
        // table headers, etc
        @if (Model != null)
        {
            Html.RenderPartial("_BudgetsActuals", Model.BudgetActualCollection);
        }
    } 
}

    public class BudgetsActualsViewModel
    {
        // Cost Center / Department Drop Down
        [Display(Name = "Cost Center/Department")]
        [Required(ErrorMessage = "Cost Center/Department is required.")]
        [StringLength(62)]
        public string SelectedDepartment { get; set; }
        public List<SelectListItem> Departments { get; set; }
    
        // Year Drop Down
        [Display(Name = "Year")]
        [Required(ErrorMessage = "Year is required.")]
        public string SelectedYear { get; set; }
        public List<SelectListItem> Years { get; set; }
    
        // Account and Name fields
        [Display(Name = "Account")]
        [StringLength(9)]
        public string Account { get; set; }
    
        [Display(Name = "Name")]
        [StringLength(12)]
        public string CostCenter { get; set; }
    
        // Seven calculated fields: Oct Actual, Oct Budget, YTD Actual, YTD 
        // Budget, YTD Variance, Est To Complete, Est at Complete
        [Display(Name = "TotalCurrentMonthActualConversion", 
        ResourceType = typeof(DynamicDisplayAttributeNames))]
        public int TotalCurrentMonthActual { get; set;  }
    
        [Display(Name = "TotalCurrentMonthBudgetConversion", 
            ResourceType = typeof(DynamicDisplayAttributeNames))]
        public int TotalCurrentMonthBudget { get; set; }
    
        [Display(Name = "YTD Actual", AutoGenerateFilter = false)]
        public int TotalYTDActual { get; set; }
    
        [Display(Name = "YTD Budget", AutoGenerateFilter = false)]
        public int TotalYTDBudget { get; set; }
    
        [Display(Name = "YTD Variance", AutoGenerateFilter = false)]
        public int TotalVariance { get; set; }
    
        [Display(Name = "Est to Complete", AutoGenerateFilter = false)]
        public int TotalETCBudget { get; set; }
    
        [Display(Name = "Est at Complete", AutoGenerateFilter = false)]
        public int TotalEAC { get; set; }
    }
    
    public class DynamicDisplayAttributeNames
    {
        public static string TotalCurrentMonthActualConversion { get; set; } 
            = DateTime.Now.AddMonths(-1).ToString("MMM") + " Actual";
        public static string TotalCurrentMonthBudgetConversion { get; set; } 
            = DateTime.Now.AddMonths(-1).ToString("MMM") + " Budget";
    }

// POST: Grab data for department and year
[HttpPost]
public ActionResult GetBudgetsActuals(BudgetsActualsViewModel model)
{
    try
    { 
        if (ModelState.IsValid)
        {
            var repo = new BudgetDemoRepository();
            ModelState.Clear();

            model.Departments = repo.GetBudgetsActuals().Departments;
            model.Years = repo.GetBudgetsActuals().Years;
            model.BudgetActualCollection = repo.GetBudgetsActualsData(model);
         }
         else
         {
             // Execution gets to here before returning to view
             model.BudgetActualCollection = new 
                 List<BudgetDemo.Models.BudgetsActualsViewModel>();
         }
         return View(model);
    }
    catch
    {
         return View("Error");
    }
}

@model BudgetDemo.Models.BudgetsActualsViewModel
@使用（Html.BeginForm（“GetBudgetActuals”，“BudgetActuals”，FormMethod.Post））
{
@Html.AntiForgeryToken（）
@Html.ValidationSummary（true，“，new{@class=“text danger”}）
@Html.DropDownListFor（m=>m.SelectedDepartment，Model.Departments，
“选择部门”，新建{@class=“表单控制”}）
@Html.ValidationMessageFor（model=>model.SelectedDepartment，“，
新建{@class=“text danger”}）
@DropDownListFor（m=>m.SelectedYear，Model.Years，“选择年份”，
新的{@class=“表单控制”}）
@Html.ValidationMessageFor（model=>model.SelectedYear，“，
新建{@class=“text danger”}）
@如果（Model.SelectedDepartment！=null&&Model.SelectedYear！=null）
{
//表格标题等
@如果（型号！=null）
{
RenderPartial（“_BudgetActuals”，Model.BudgetTualCollection）；
}
} 
}

型号：

@model BudgetDemo.Models.BudgetsActualsViewModel

@using (Html.BeginForm("GetBudgetsActuals", "BudgetsActuals", FormMethod.Post))
{
    @Html.AntiForgeryToken()
    @Html.ValidationSummary(true, "", new { @class = "text-danger" })

    <div class="col-md-6">
        <div class="form-group">
            @Html.DropDownListFor(m => m.SelectedDepartment, Model.Departments, 
                "Select Department", new { @class = "form-control" })
            @Html.ValidationMessageFor(model => model.SelectedDepartment, "", 
                new { @class = "text-danger" })
        </div>
    </div>
    <div class="col-md-6">
        <div class="form-group">
            @Html.DropDownListFor(m => m.SelectedYear, Model.Years, "Select Year", 
                new { @class = "form-control" })
            @Html.ValidationMessageFor(model => model.SelectedYear, "", 
                new { @class = "text-danger" })
        </div>
   </div>

   <div class="form-group">
       <div class="col-lg-7">
           <input type="submit" value="Submit" class="btn btn-info" />
       </div>
   </div>

    @if (Model.SelectedDepartment != null && Model.SelectedYear != null)
    {
        // table headers, etc
        @if (Model != null)
        {
            Html.RenderPartial("_BudgetsActuals", Model.BudgetActualCollection);
        }
    } 
}

    public class BudgetsActualsViewModel
    {
        // Cost Center / Department Drop Down
        [Display(Name = "Cost Center/Department")]
        [Required(ErrorMessage = "Cost Center/Department is required.")]
        [StringLength(62)]
        public string SelectedDepartment { get; set; }
        public List<SelectListItem> Departments { get; set; }
    
        // Year Drop Down
        [Display(Name = "Year")]
        [Required(ErrorMessage = "Year is required.")]
        public string SelectedYear { get; set; }
        public List<SelectListItem> Years { get; set; }
    
        // Account and Name fields
        [Display(Name = "Account")]
        [StringLength(9)]
        public string Account { get; set; }
    
        [Display(Name = "Name")]
        [StringLength(12)]
        public string CostCenter { get; set; }
    
        // Seven calculated fields: Oct Actual, Oct Budget, YTD Actual, YTD 
        // Budget, YTD Variance, Est To Complete, Est at Complete
        [Display(Name = "TotalCurrentMonthActualConversion", 
        ResourceType = typeof(DynamicDisplayAttributeNames))]
        public int TotalCurrentMonthActual { get; set;  }
    
        [Display(Name = "TotalCurrentMonthBudgetConversion", 
            ResourceType = typeof(DynamicDisplayAttributeNames))]
        public int TotalCurrentMonthBudget { get; set; }
    
        [Display(Name = "YTD Actual", AutoGenerateFilter = false)]
        public int TotalYTDActual { get; set; }
    
        [Display(Name = "YTD Budget", AutoGenerateFilter = false)]
        public int TotalYTDBudget { get; set; }
    
        [Display(Name = "YTD Variance", AutoGenerateFilter = false)]
        public int TotalVariance { get; set; }
    
        [Display(Name = "Est to Complete", AutoGenerateFilter = false)]
        public int TotalETCBudget { get; set; }
    
        [Display(Name = "Est at Complete", AutoGenerateFilter = false)]
        public int TotalEAC { get; set; }
    }
    
    public class DynamicDisplayAttributeNames
    {
        public static string TotalCurrentMonthActualConversion { get; set; } 
            = DateTime.Now.AddMonths(-1).ToString("MMM") + " Actual";
        public static string TotalCurrentMonthBudgetConversion { get; set; } 
            = DateTime.Now.AddMonths(-1).ToString("MMM") + " Budget";
    }

// POST: Grab data for department and year
[HttpPost]
public ActionResult GetBudgetsActuals(BudgetsActualsViewModel model)
{
    try
    { 
        if (ModelState.IsValid)
        {
            var repo = new BudgetDemoRepository();
            ModelState.Clear();

            model.Departments = repo.GetBudgetsActuals().Departments;
            model.Years = repo.GetBudgetsActuals().Years;
            model.BudgetActualCollection = repo.GetBudgetsActualsData(model);
         }
         else
         {
             // Execution gets to here before returning to view
             model.BudgetActualCollection = new 
                 List<BudgetDemo.Models.BudgetsActualsViewModel>();
         }
         return View(model);
    }
    catch
    {
         return View("Error");
    }
}

公共类BudgetActualViewModel
{
//成本中心/部门下拉列表
[显示（Name=“成本中心/部门”）]
[必需（ErrorMessage=“需要成本中心/部门”）]
[行政长官（62）]
公共字符串SelectedDepartment{get；set；}
公共列表部门{get；set；}
//年份下拉列表
[显示（Name=“Year”）]
[必需（ErrorMessage=“需要年份”）]
公共字符串SelectedYear{get；set；}
公共列表年份{get；set；}
//帐户和名称字段
[显示（Name=“Account”）]
[第（9）条]
公共字符串帐户{get；set；}
[显示（Name=“Name”）]
[条次建议修正案（12）]
公共字符串成本中心{get；set；}
//七个计算字段：十月实际、十月预算、年初至今实际、年初至今
//预算，年初至今差异，预计完工时间，预计完工时间
[显示（Name=“TotalCurrentMonthActualConversion”，
ResourceType=typeof（DynamicDisplayAttributeNames））]
公共int TotalCurrentMonthActual{get；set；}
[显示（Name=“TotalCurrentMonthBudgetConversion”，
ResourceType=typeof（DynamicDisplayAttributeNames））]
公共int TotalCurrentMonthBudget{get；set；}
[显示（Name=“YTD实际”，AutoGenerateFilter=false）]
公共整数TotalYTDActual{get；set；}
[显示（Name=“年初至今预算”，AutoGenerateFilter=false）]
公共整数TotalYTDBudget{get；set；}
[显示（Name=“YTD方差”，AutoGenerateFilter=false）]
公共整数总方差{get；set；}
[显示（Name=“Est to Complete”，AutoGenerateFilter=false）]
public int TotalETCBudget{get；set；}
[显示（Name=“Est at Complete”，AutoGenerateFilter=false）]
公共整数TotalEAC{get；set；}
}
公共类DynamicDisplayAttributeName
{
公共静态字符串TotalCurrentMonthActualConversion{get；set；}
=DateTime.Now.AddMonths（-1）.ToString（“MMM”）+实际值；
公共静态字符串TotalCurrentMonthBudgetConversion{get；set；}
=DateTime.Now.AddMonths（-1）.ToString（“MMM”）+“Budget”；
}

控制器：

@model BudgetDemo.Models.BudgetsActualsViewModel

@using (Html.BeginForm("GetBudgetsActuals", "BudgetsActuals", FormMethod.Post))
{
    @Html.AntiForgeryToken()
    @Html.ValidationSummary(true, "", new { @class = "text-danger" })

    <div class="col-md-6">
        <div class="form-group">
            @Html.DropDownListFor(m => m.SelectedDepartment, Model.Departments, 
                "Select Department", new { @class = "form-control" })
            @Html.ValidationMessageFor(model => model.SelectedDepartment, "", 
                new { @class = "text-danger" })
        </div>
    </div>
    <div class="col-md-6">
        <div class="form-group">
            @Html.DropDownListFor(m => m.SelectedYear, Model.Years, "Select Year", 
                new { @class = "form-control" })
            @Html.ValidationMessageFor(model => model.SelectedYear, "", 
                new { @class = "text-danger" })
        </div>
   </div>

   <div class="form-group">
       <div class="col-lg-7">
           <input type="submit" value="Submit" class="btn btn-info" />
       </div>
   </div>

    @if (Model.SelectedDepartment != null && Model.SelectedYear != null)
    {
        // table headers, etc
        @if (Model != null)
        {
            Html.RenderPartial("_BudgetsActuals", Model.BudgetActualCollection);
        }
    } 
}

    public class BudgetsActualsViewModel
    {
        // Cost Center / Department Drop Down
        [Display(Name = "Cost Center/Department")]
        [Required(ErrorMessage = "Cost Center/Department is required.")]
        [StringLength(62)]
        public string SelectedDepartment { get; set; }
        public List<SelectListItem> Departments { get; set; }
    
        // Year Drop Down
        [Display(Name = "Year")]
        [Required(ErrorMessage = "Year is required.")]
        public string SelectedYear { get; set; }
        public List<SelectListItem> Years { get; set; }
    
        // Account and Name fields
        [Display(Name = "Account")]
        [StringLength(9)]
        public string Account { get; set; }
    
        [Display(Name = "Name")]
        [StringLength(12)]
        public string CostCenter { get; set; }
    
        // Seven calculated fields: Oct Actual, Oct Budget, YTD Actual, YTD 
        // Budget, YTD Variance, Est To Complete, Est at Complete
        [Display(Name = "TotalCurrentMonthActualConversion", 
        ResourceType = typeof(DynamicDisplayAttributeNames))]
        public int TotalCurrentMonthActual { get; set;  }
    
        [Display(Name = "TotalCurrentMonthBudgetConversion", 
            ResourceType = typeof(DynamicDisplayAttributeNames))]
        public int TotalCurrentMonthBudget { get; set; }
    
        [Display(Name = "YTD Actual", AutoGenerateFilter = false)]
        public int TotalYTDActual { get; set; }
    
        [Display(Name = "YTD Budget", AutoGenerateFilter = false)]
        public int TotalYTDBudget { get; set; }
    
        [Display(Name = "YTD Variance", AutoGenerateFilter = false)]
        public int TotalVariance { get; set; }
    
        [Display(Name = "Est to Complete", AutoGenerateFilter = false)]
        public int TotalETCBudget { get; set; }
    
        [Display(Name = "Est at Complete", AutoGenerateFilter = false)]
        public int TotalEAC { get; set; }
    }
    
    public class DynamicDisplayAttributeNames
    {
        public static string TotalCurrentMonthActualConversion { get; set; } 
            = DateTime.Now.AddMonths(-1).ToString("MMM") + " Actual";
        public static string TotalCurrentMonthBudgetConversion { get; set; } 
            = DateTime.Now.AddMonths(-1).ToString("MMM") + " Budget";
    }

// POST: Grab data for department and year
[HttpPost]
public ActionResult GetBudgetsActuals(BudgetsActualsViewModel model)
{
    try
    { 
        if (ModelState.IsValid)
        {
            var repo = new BudgetDemoRepository();
            ModelState.Clear();

            model.Departments = repo.GetBudgetsActuals().Departments;
            model.Years = repo.GetBudgetsActuals().Years;
            model.BudgetActualCollection = repo.GetBudgetsActualsData(model);
         }
         else
         {
             // Execution gets to here before returning to view
             model.BudgetActualCollection = new 
                 List<BudgetDemo.Models.BudgetsActualsViewModel>();
         }
         return View(model);
    }
    catch
    {
         return View("Error");
    }
}

//POST:获取部门和年度的数据
[HttpPost]
公共行动结果GetBudgetActuals（BudgetActualsViewModel模型）
{
尝试
{ 
if（ModelState.IsValid）
{
var repo=新预算存储库（）；
ModelState.Clear（）；
model.Departments=repo.getBudgetActuals（）.Departments；
model.Years=repo.getBudgetActuals（）.Years；
model.BudgetActualCollection=repo.getbudgetsactualdata（model）；
}
其他的
{
//执行在返回视图之前到达此处
model.BudgetActualCollection=新建
List（）；
}
返回视图（模型）；
}
抓住
{
返回视图（“错误”）；
}
}

这似乎是HttpPost方法的一个问题。提交表单时，集合没有传递，因此我们将丢失其中的数据。现在，

HttpPost

方法返回相同的视图，但它只分配

if

块中的集合，因此当任何一个下拉列表丢失时，

if

状态将为false，执行将进入

else

块，并返回带有模型的视图。在这种情况下，从未为集合分配数据。将

HttpPost

更新到下面，以便在不考虑其他条件的情况下填充集合

// POST: Grab data for department and year
[HttpPost]
public ActionResult GetBudgetsActuals(BudgetsActualsViewModel model)
{
    try
    { 
         // assign collections before returning view
         var repo = new BudgetDemoRepository();
         model.Departments = repo.GetBudgetsActuals().Departments;
         model.Years = repo.GetBudgetsActuals().Years;

         if (ModelState.IsValid)
         {            
            ModelState.Clear();            
            model.BudgetActualCollection = repo.GetBudgetsActualsData(model);
         }
         else
         {
             model.BudgetActualCollection = new 
                 List<BudgetDemo.Models.BudgetsActualsViewModel>();
         }
         return View(model);
    }
    catch
    {
         return View("Error");
    }
}

//POST:获取部门和年度的数据
[HttpPost]
公共行动结果GetBudgetActuals（BudgetActualsViewModel模型）
{
尝试
{ 
//在返回视图之前分配集合
var repo=新预算存储库（）；
model.Departments=repo.getBudgetActuals（）.Departments；
model.Years=repo.getBudgetActuals（）.Years；
if（ModelState.IsValid）
{            
ModelState.Clear（）；
model.BudgetActualCollection=repo.getbudgetsactualdata（model）；
}