Question

Create.cshtml（添加图片部分）

  <div class="form-group">
        @Html.LabelFor(model => model.JobImage, htmlAttributes: new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            <input type="file" name="upload" />
            @Html.ValidationMessageFor(model => model.JobImage, "", new { @class = "text-danger" })
        </div>
    </div>

完整的Create.cshtml

@model JobOfersWebSite.Models.job

@{
    ViewBag.Title = "Create";
    Layout = "~/Views/shared/_MainLayout.cshtml";
}

<h2>Create</h2>
@using System.Web.Mvc;
@using(Html.BeginForm("Create", "jobs", FormMethod.Post, new {enctype="multipart/from-data" }))
{
    @Html.AntiForgeryToken()

    <div class="form-horizontal">
        <h4>job</h4>
        <hr />
        @Html.ValidationSummary(true, "", new { @class = "text-danger" })
        <div class="form-group">
            @Html.LabelFor(model => model.JobTitle, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                @Html.EditorFor(model => model.JobTitle, new { htmlAttributes = new { @class = "form-control" } })
                @Html.ValidationMessageFor(model => model.JobTitle, "", new { @class = "text-danger" })
            </div>
        </div>

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

        <div class="form-group">
            @Html.LabelFor(model => model.JobImage, htmlAttributes: new { @class = "control-label col-md-2" })
            <div class="col-md-10">
                <input type="file" name="upload" />
                @Html.ValidationMessageFor(model => model.JobImage, "", new { @class = "text-danger" })
            </div>
        </div>

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

        <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 to List", "Index")
</div>

JobController.cshtml

public ActionResult Create( job job,HttpPostedFileBase upload)
{
    if (ModelState.IsValid)
    {
        string path = Path.Combine(Server.MapPath("~/Uploads"), upload.FileName);
        upload.SaveAs(path);
        job.JobImage = upload.FileName;
        db.jobs.Add(job);
        db.SaveChanges();
        return RedirectToAction("Index");
    }

FR中的问题 Laréférenced'objetn'estpasdéfinieàuneinstance d'un objet。

描述：Une例外非géréess'estproduite au moment de l'exécutiondelarequêteWebactuelle。 Contrôlezlatrace de la pile pour plus d'informations sur l'erreur et son origin dans le code。

Détailsdel'exception：System.NullReferenceException：Laréférenced'objetn'estpasdéfinieàuneinstance d'un objet。

Erreur来源：

Ligne 54 :             if (ModelState.IsValid)
Ligne 55 :             {
Ligne 56 :                 string path = Path.Combine(Server.MapPath("~/Uploads"), upload.FileName);
Ligne 57 :                 upload.SaveAs(path);
Ligne 58 :                 job.JobImage = upload.FileName;

Fichier来源：c：\ Users \ DelManari \ Documents \ Visual Studio 2013 \ Projects \ JobOfersWebSite \ JobOfersWebSite \ Controllers \ jobsController.cs Ligne：56 Trace de la pile：

[NullReferenceException：Laréférenced'objetn'estpasdéfinieàuneinstance d'un objet。 JobOfersWebSite.Controllers.jobsController.Create（作业作业，HttpPostedFileBase上传）在c：\ Users \ DelManari \ Documents \ Visual Studio 2013 \ Projects \ JobOfersWebSite \ JobOfersWebSite \ Controllers \ jobsController.cs：56 lambda_method（Closure，ControllerBase，Object []）+147 System.Web.Mvc.ActionMethodDispatcher.Execute（ControllerBase controller，Object []参数）+14 System.Web.Mvc.ReflectedActionDescriptor.Execute（ControllerContext controllerContext，IDictionary 2 parameters) +157 System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary 2个参数）+27 System.Web.Mvc.Async.AsyncControllerActionInvoker.b__39（IAsyncResult asyncResult，ActionInvocation innerInvokeState）+22 System.Web.Mvc.Async.WrappedAsyncResult 2.CallEndDelegate(IAsyncResult asyncResult) +29 System.Web.Mvc.Async.WrappedAsyncResultBase 1.End（）+49 System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod（IAsyncResult asyncResult）+32 System.Web.Mvc.Async.AsyncInvocationWithFilters.b__3f（）+50 System.Web.Mvc.Async。＆lt;＆gt; c__DisplayClass48.b__41（）+228 System.Web.Mvc.Async。＆lt;＆gt; c__DisplayClass33.b__32（IAsyncResult asyncResult）+10 System.Web.Mvc.Async.WrappedAsyncResult 1.CallEndDelegate(IAsyncResult asyncResult) +10 System.Web.Mvc.Async.WrappedAsyncResultBase 1.End（）+49 System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters（IAsyncResult asyncResult）+34 System.Web.Mvc.Async。＆lt;＆gt; c__DisplayClass2b.b__1c（）+26 System.Web.Mvc.Async。＆lt;＆gt; c__DisplayClass21.b__1e（IAsyncResult asyncResult）+100 System.Web.Mvc.Async.WrappedAsyncResult 1.CallEndDelegate(IAsyncResult asyncResult) +10 System.Web.Mvc.Async.WrappedAsyncResultBase 1.End（）+49 System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction（IAsyncResult asyncResult）+27 System.Web.Mvc.Controller.b__1d（IAsyncResult asyncResult，ExecuteCoreState innerState）+13 System.Web.Mvc.Async.WrappedAsyncVoid 1.CallEndDelegate(IAsyncResult asyncResult) +29 System.Web.Mvc.Async.WrappedAsyncResultBase 1.End（）+49 System.Web.Mvc.Controller.EndExecuteCore（IAsyncResult asyncResult）+36 System.Web.Mvc.Controller.b__15（IAsyncResult asyncResult，Controller controller）+12 System.Web.Mvc.Async.WrappedAsyncVoid 1.CallEndDelegate(IAsyncResult asyncResult) +22 System.Web.Mvc.Async.WrappedAsyncResultBase 1.End（）+49 System.Web.Mvc.Controller.EndExecute（IAsyncResult asyncResult）+26 System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute（IAsyncResult asyncResult）+10 System.Web.Mvc.MvcHandler.b__5（IAsyncResult asyncResult，ProcessRequestState innerState）+21 System.Web.Mvc.Async.WrappedAsyncVoid 1.CallEndDelegate(IAsyncResult asyncResult) +29 System.Web.Mvc.Async.WrappedAsyncResultBase 1.End（）+49 System.Web.Mvc.MvcHandler.EndProcessRequest（IAsyncResult asyncResult）+28 System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest（IAsyncResult result）+9 System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute（）+9986301 System.Web.HttpApplication.ExecuteStep（IExecutionStep step，Boolean＆amp; completedSynchronously）+155

Answer 1

问题可能是由于错字 - @using（Html.BeginForm（＆＃34; Create＆＃34;，＆＃34; jobs＆＃34;，FormMethod.Post，new {enctype =＆＃34; multipart / from-data ＆＃34;}））

应该是enctype =＆＃34; multipart / form-data ＆＃34;

剃刀添加图片，路径不工作asp.net

1 个答案: