MVC CRUD：从create直接转到udpate

时间：2018-04-09 15:55:13

标签： c# asp.net-mvc crud

我有一个相对简单的流程：

发布项目 - ＆gt;发布预览 - ＆gt;选项A：编辑|选项B：发布

一切正常，尽可能使用标准CRUD。但是，在发布项目的情况下，然后进入预览屏幕并且用户想要发布（这实际上只是在数据库中将bool从false更改为true）我收到以下错误消息：

  

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。描述：一个   在执行当前Web期间发生了未处理的异常   请求。请查看堆栈跟踪以获取有关的更多信息   错误以及它在代码中的起源。

     

异常详细信息：   System.Data.Entity.Validation.DbEntityValidationException：验证   一个或多个实体失败。请参阅'EntityValidationErrors'属性   了解更多详情。

与标准CRUD一样，我在编辑时调用项目的ID，但是当从创建移动到预览时，似乎没有逻辑方法来调用ID，因为它刚刚被创建。但是，通过介于两者之间的额外步骤，我认为问题在于我尝试编辑时没有在预览视图中指定ID。

这是发布部分的控制器代码：

    //POST: /errandom/errandPreview
    public ActionResult ConfirmErrand()
    {
        // define variables for reuse
        var userID = User.Identity.GetUserId();
        DateTime nowUTC = DateTime.Now.ToUniversalTime();
        DateTime nowLocal = DateTime.Now.ToLocalTime();
        // define errand
        var errand = new errands
        {
            // form
            Published = true
        };
        // save errand to DB
        ERRANDOM.Entry(errand).State = EntityState.Modified;
        ERRANDOM.SaveChanges();
        return RedirectToAction("Index");
    }

加上完整性的观点：

<section id="errandPreview" class="manageForm">
    @using (Html.BeginForm("errandPreviewForm", "errandom", FormMethod.Post, new { @id = "errandPreviewForm", @class = "form-horizontal", @role = "form" }))
    {
        @Html.AntiForgeryToken()
        @Html.HiddenFor(m => m.LatitudePosted, new { @id = "errandPreviewLatitudePosted", @class = "userActivity" })
        @Html.HiddenFor(m => m.LongitudePosted, new { @id = "errandPreviewLongitudePosted", @class = "userActivity" })
        @Html.HiddenFor(m => m.LocationPosted, new { @id = "errandPreviewUserLocationPosted", @class = "userActivity" })
        @Html.HiddenFor(m => m.ID, new { @id = "errandPreviewID", @class = "errandPreviewID" })
    <div id="errandPreviewErrandSection" class="manageSection">
        <p id="errandPreviewErrandSectionTitle" class="manageSectionTitle">
            @Html.DisplayFor(m => m.Title)
        </p>
        <div id="errandPreviewCategoryArea" class="manageArea row">
            <div id="errandPreviewDateTimePostedDisplayName" class="errandomDisplayName col-xs-offset-1 col-xs-10 col-sm-offset-1 col-sm-10 col-md-offset-1 col-md-10 col-lg-offset-1 col-lg-10">
                @Html.DisplayNameFor(m => m.DateTimePosted)
            </div>
            <div id="errandPreviewDateTimePostedDisplay" class="errandomDisplay col-xs-offset-1 col-xs-10 col-sm-offset-1 col-sm-10 col-md-offset-1 col-md-10 col-lg-offset-1 col-lg-10">
                @Html.DisplayFor(m => m.DateTimePosted)
            </div>
            <div id="errandPreviewCategoryDisplayName" class="errandomDisplayName col-xs-offset-1 col-xs-5 col-sm-offset-1 col-sm-5 col-md-offset-1 col-md-5 col-lg-offset-1 col-lg-5">
                @Html.DisplayNameFor(m => m.Category)
            </div>
            <div id="errandPreviewSubCategoryDisplayName" class="errandomDisplayName col-xs-5 col-sm-5 col-md-5 col-lg-5">
                @Html.DisplayNameFor(m => m.SubCategory)
            </div>
            <div id="errandPreviewCategoryDisplay" class="errandomDisplay col-xs-offset-1 col-xs-5 col-sm-offset-1 col-sm-5 col-md-offset-1 col-md-5 col-lg-offset-1 col-lg-5">
                @Html.DisplayFor(m => m.Category)
            </div>
            <div id="errandPreviewSubCategoryDisplay" class="errandomDisplay col-xs-5 col-sm-5 col-md-5 col-lg-5">
                @Html.DisplayFor(m => m.SubCategory)
            </div>
        </div>
        <hr />
        <div id="errandPreviewDescriptionArea" class="manageArea row">
            <div id="errandPreviewPictureDisplay" class="errandomDisplay col-xs-offset-1 col-xs-10 col-sm-offset-1 col-sm-3 col-md-offset-1 col-md-3 col-lg-offset-1 col-lg-3">
                <img id="errandPreviewPicture" class="errandPreviewPicture" src="@Url.Action("errandPicture", "errandom")" />
            </div>
            <div id="errandPreviewDescriptionDisplay" class="errandomDisplay col-xs-offset-1 col-xs-10 col-sm-offset-0 col-sm-7 col-md-offset-0 col-md-7 col-lg-offset-0 col-lg-7">
                @Html.DisplayFor(m => m.Description)
            </div>
        </div>
        <hr />
        <div id="errandPreviewLocationArea" class="manageArea row">
            <div id="errandPreviewLocationDisplayName" class="errandomDisplayName col-xs-offset-1 col-xs-10 col-sm-offset-1 col-sm-10 col-md-offset-1 col-md-10 col-lg-offset-1 col-lg-10">
                @Html.DisplayNameFor(m => m.Location)
            </div>
            <div id="errandPreviewLocationDisplay" class="errandomDisplay col-xs-offset-1 col-xs-10 col-sm-offset-1 col-sm-10 col-md-offset-1 col-md-10 col-lg-offset-1 col-lg-10">
                @Html.DisplayFor(m => m.Location)
                @Html.HiddenFor(m => m.Location, new { @id = "errandPreviewLocationDisplayValue", @class = "manageDisplay" })
            </div>
            <div id="errandPreviewMapDisplayFrame" class="col-xs-12 col-sm-12 col-md-12 col-lg-12">
                <div id="errandPreviewMapDisplay" class="errandomDisplay col-xs-offset-1 col-xs-10 col-sm-offset-1 col-sm-10 col-md-offset-1 col-md-10 col-lg-offset-1 col-lg-10">
                </div>
            </div>
        </div>
        <hr />
        <div id="errandPreviewTimeArea" class="manageArea row">
            <div id="errandPreviewASAPDisplayName" class="errandomDisplayName col-xs-offset-1 col-xs-5 col-sm-offset-1 col-sm-5 col-md-offset-1 col-md-5 col-lg-offset-1 col-lg-5">
                @Html.DisplayNameFor(m => m.ASAP)
            </div>
            <div id="errandPreviewASAPDisplay" class="errandomDisplay col-xs-offset-0 col-xs-5 col-sm-offset-0 col-sm-5 col-md-offset-0 col-md-5 col-lg-offset-0 col-lg-5">
                @Html.DisplayFor(m => m.ASAP)
            </div>
            <div id="errandPreviewStartDateTimeDisplayName" class="errandomDisplayName col-xs-offset-1 col-xs-10 col-sm-offset-1 col-sm-5 col-md-offset-1 col-md-5 col-lg-offset-1 col-lg-5">
                @Html.DisplayNameFor(m => m.StartDateTime)
            </div>
            <div id="errandPreviewStartDateTimeDisplay" class="errandomDisplay col-xs-offset-1 col-xs-10 col-sm-offset-0 col-sm-5 col-md-offset-0 col-md-5 col-lg-offset-0 col-lg-5">
                @Html.DisplayFor(m => m.StartDateTime)
            </div>
            <div id="errandPreviewEndDateTimeDisplayName" class="errandomDisplayName col-xs-offset-1 col-xs-10 col-sm-offset-1 col-sm-5 col-md-offset-1 col-md-5 col-lg-offset-1 col-lg-5">
                @Html.DisplayNameFor(m => m.EndDateTime)
            </div>
            <div id="errandPreviewEndDateTimeDisplay" class="errandomDisplay col-xs-offset-1 col-xs-10 col-sm-offset-0 col-sm-5 col-md-offset-0 col-md-5 col-lg-offset-0 col-lg-5">
                @Html.DisplayFor(m => m.EndDateTime)
            </div>
            <div id="errandPreviewDurationInHoursDisplayName" class="errandomDisplayName col-xs-offset-1 col-xs-5 col-sm-offset-1 col-sm-5 col-md-offset-1 col-md-5 col-lg-offset-1 col-lg-5">
                @Html.DisplayNameFor(m => m.DurationInHours)
            </div>
            <div id="errandPreviewDurationInHoursDisplay" class="errandomDisplay col-xs-offset-0 col-xs-5 col-sm-offset-0 col-sm-5 col-md-offset-0 col-md-5 col-lg-offset-0 col-lg-5">
                @Html.DisplayFor(m => m.DurationInHours)
            </div>
        </div>
        <hr />
        <div id="errandPreviewOfferingArea" class="manageArea row">
            <div id="errandPreviewOfferingDisplayName" class="errandomDisplayName col-xs-offset-1 col-xs-5 col-sm-offset-1 col-sm-5 col-md-offset-1 col-md-5 col-lg-offset-1 col-lg-5">
                @Html.DisplayNameFor(m => m.Offering)
            </div>
            <div id="errandPreviewPaymentMethodDisplayName" class="errandomDisplayName col-xs-5 col-sm-5 col-md-5 col-lg-5">
                @Html.DisplayNameFor(m => m.PaymentMethod)
            </div>
            <div id="errandPreviewCurrencyDisplay" class="errandomDisplay col-xs-offset-1 col-xs-2 col-sm-offset-1 col-sm-1 col-md-offset-1 col-md-1 col-lg-offset-1 col-lg-1">
                @Html.DisplayFor(m => m.Currency)
            </div>
            <div id="errandPreviewOfferingDisplay" class="errandomDisplay col-xs-offset-0 col-xs-3 col-sm-offset-0 col-sm-4 col-md-offset-0 col-md-4 col-lg-offset-0 col-lg-4">
                @Html.DisplayFor(m => m.Offering)
            </div>
            <div id="errandPreviewPaymentMethodDisplay" class="errandomDisplay col-xs-5 col-sm-5 col-md-5 col-lg-5">
                @Html.DisplayFor(m => m.PaymentMethod)
            </div>
            <div id="errandPreviewPriceDisplayName" class="errandomDisplayName col-xs-offset-1 col-xs-12 col-sm-offset-1 col-sm-12 col-md-offset-1 col-md-12 col-lg-offset-1 col-lg-12">
                @Html.DisplayNameFor(m => m.Price)
            </div>
            <div id="errandPreviewPriceDisplay" class="errandomDisplay col-xs-offset-1 col-xs-12 col-sm-offset-1 col-sm-12 col-md-offset-1 col-md-12 col-lg-offset-1 col-lg-12">
                @Html.DisplayFor(m => m.Price)
            </div>
        </div>
        <hr />
        <div id="errandPreviewUserArea" class="manageArea row">
            <div id="errandPreviewUserPictureDisplay" class="errandomDisplay col-xs-offset-1 col-xs-3 col-sm-offset-1 col-sm-2 col-md-offset-1 col-md-2 col-lg-offset-1 col-lg-2">
                <img id="errandPreviewUserPicture" class="errandPreviewUserPicture" src="@Url.Action("UserPicture", "Manage")" />
            </div>
            <div id="errandPreviewFirstNameDisplay" class="errandomDisplay col-xs-7 col-sm-8 col-md-8 col-lg-8">
                @Html.DisplayFor(m => m.FirstName)
                @*link to contact for questions*@
                @Html.DisplayFor(m => m.Rating)
            </div>
        </div>
    </div>
        <div id="errandPreviewButtonSection" class="manageSection">
            <div id="errandPreviewButtonArea" class="manageArea row">
                @Html.ActionLink("Edit", "EditErrand", "errandom", new { ID = Model.ID }, htmlAttributes: new { @id = "errandPreviewEditButton", @class = "manageButton col-xs-5 col-sm-5 col-md-5 col-lg-5" })
                <div id="errandPreviewButtonSeparator" class="manageSeparator col-xs-2 col-sm-2 col-md-2 col-lg-2"></div>
                @Html.ActionLink("Post", "ConfirmErrand", "errandom", new { ID = Model.ID }, htmlAttributes: new { @id = "errandPreviewPostButton", @class = "manageButton col-xs-5 col-sm-5 col-md-5 col-lg-5" })
            </div>
        </div>
    }
</section>

知道我哪里错了吗？如上所述，目标应该是从 CREATE 直接转到 PREVIEW （基本上是精简版UPDATE），然后回到 INDEX 。

1 个答案:

答案 0 :(得分：1)

据我了解您的问题，您希望在发布前进行预览，如果您已保存记录，则可以使用以下方式获取ID：

//POST: /errandom/errandPreview
public ActionResult ConfirmErrand(int? ID) //Add this parameter to get record ID
{
    //Your other logic here..

    var errand = ERRANDOM.errands.Find(ID); //Find your record 
    errand.Published = true; 

    //Update errand to DB
    ERRANDOM.Entry(errand).State = EntityState.Modified;
    ERRANDOM.SaveChanges();
    return RedirectToAction("Index");
}

您可以使用查找方法获取记录，因为您在此处的View现有代码上传递了代码中的ID：

@Html.ActionLink("Post", "ConfirmErrand", "errandom", new { ID = Model.ID }, htmlAttributes: new { @id = "errandPreviewPostButton", @class = "manageButton col-xs-5 col-sm-5 col-md-5 col-lg-5" })
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