Question

我是ASP.NET的新手，我正在尝试修饰一个动作方法，允许管理员通过插入名字，姓氏和余额来创建新用户。操作方法应在checkingaccount表中生成Id，帐号和AppUserId。但是，后创建操作会抛出以下异常，因为我没有传递AppUserId

一个或多个实体的验证失败。看到 'EntityValidationErrors'属性以获取更多详细信息。

我可以在桌面上添加AppuserId吗？

创建操作方法

 [HttpPost]
        public ActionResult Create(string FName, string LName, string UserId, decimal balance)
        {

                var accountNumber = (12 + db.checkAccounts.Count()).ToString().PadLeft(10, '0');
                var checking = new CheckingAccount
                {
                    FirstName = FName,
                    LastName = LName,
                    AccountNumber = accountNumber,
                    Balance = balance,
                    AppUserId = UserId
                };
                db.checkAccounts.Add(checking);
                db.SaveChanges();

                return RedirectToAction("ViewAccounts");

        }

CheckingAccount模型

public class CheckingAccount
    {
        public int Id { get; set; }

        public string AccountNumber { get; set; }

        public string FirstName { get; set; }

        public string LastName { get; set; }

        public string Telephone { get; set; }


        public decimal Balance { get; set; }

        public virtual ApplicationUser User { get; set; }
        [Display(Name = "User ID: ")]
        [Required]
        public string AppUserId { get; set; }

    }

CheckingAccount模型

@model Project.Models.CheckingAccount

@{
    ViewBag.Title = "Create";
}

@using (Html.BeginForm()) 
{
    @Html.AntiForgeryToken()

    <div class="form-horizontal">
        <h4>Checking Account</h4>
        <hr />
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })

        @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        @Html.HiddenFor(model => model.AccountNumber)
 <div class="form-group">
            @Html.LabelFor(model => model.FirstName, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.FirstName, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.FirstName, "", new { @class = "text-danger" })
            </div>
        </div>

        <div class="form-group">
            @Html.LabelFor(model => model.LastName, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.LastName, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.LastName, "", new { @class = "text-danger" })
            </div>
        </div>
<div class="form-group">
            @Html.LabelFor(model => model.Balance, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.Balance, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.Balance, "", new { @class = "text-danger" })
            </div>
        </div>

         @Html.ValidationSummary(true, "", new { @class = "text-danger" })
         @Html.HiddenFor(model => model.AppUserId)


        <div class="form-group">
            <div class="col-md-offset-2 col-md-10">
                <input type="submit" value="Create" class="btn btn-default" />
            </div>
        </div>
    </div>
}

<div>
     @Html.ActionLink("Back", "ViewAccounts", null, new { @class = "btn btn-info" })
</div>

@section Scripts {
    @Scripts.Render("~/bundles/jqueryval")
}

Answer 1

您的ActionMethod参数与表单字段的名称完全匹配。例如，当您的实际模型属性为FName和LName时，您正在使用FirstName和LastName。因此，您的参数是空字符串。模型绑定器不知道FName和FirstName应该是相同的东西。

在操作方法中更正参数名称：

   [HttpPost]
   public ActionResult Create(string FirstName, string LastName, string AppUserId, decimal Balance){

或

由于您使用的是强类型视图，因此只需使用View中的模型作为Create ActionResult参数

[HttpPost] public ActionResult Create(CheckingAccount model){ //fancy black magic binds all of the form properties //to this model parameter for you! model.AccountNumber = (12 + db.checkAccounts.Count()).ToString().PadLeft(10, '0'); db.checkAccounts.Add(model); db.SaveChanges(); }

此外，您可以使用以下代码来获取特定的实体错误：

try{ db.SaveChanges(); } catch (DbEntityValidationException e){ foreach (var error in e.EntityValidationErrors){ foreach (var propertyError in error.ValidationErrors){ Console.WriteLine($"{propertyError.PropertyName} had the following issue: {propertyError.ErrorMessage}"); } } }

Answer 2

您可以使用try catch包装违规代码，并在catch中查看您需要解决的特定Entity Framework错误。如果您在此处发布详细错误后不知道该怎么做。但更多信息会有所帮助。

angular.module('angularModelerApp').directive('prettyprint',       function($document) {
  return {
    restrict: 'C',
    scope: {
      xml: '@'
    },
    link: function postLink(scope, element, attrs) {
      scope.$watch('xml', function(newVal, oldVal) {
         element.text(vkbeautify.xml(newVal, 4));
      });
    }
  };
});

一个或多个实体的验证失败。请参阅'EntityValidationErrors'属性

2 个答案: