I am getting the below error which I can't find any solution in the internet : System.Collections.Generic.IEnumerable<>does not contain a definition for 'HtmlConvertToJson and no extension method 'HtmlConvertToJson accepting a first argument of type 'System.Wev.Mvc.HtmlHelper<System.Collections.GenericIEnumerable<> could be found(are you missing a using directive or an assembly And this is the page where the error occurs at the line new ViewModel(@Html.HtmlConvertToJson(Model))); Hope someone can help me out on this. @model IEnumerable<BootstrapIntroduction.Models.Author> @{ ViewBag.Title = Authors ; } <h2>Authors</h2> <p> @Html.ActionLink( Create New Create ) </p> <table class = table table-bordered table-striped > <thead> <tr> <th>@Html.DisplayNameFor(model => model.FirstName) </th> <th>@Html.DisplayNameFor(model => model.LastName) </th> <th>@Html.DisplayNameFor(model => model.Biography) </th> <th>Actions</th> </tr> </thead> <tbody data-bind= foreach: authors > <tr> <td data-bind= text: FirstName ></td> <td data-bind= text: LastName ></td> <td> <a data-bind= attr {href: '@Url.Action( Details )/' + Id } class = btn btn-info >Details</a> <a data-bind= attr {href: '@Url.Action( Edit )/' + Id } class = btn btn-primary >Edit</a> <a data-bind= attr: {href: '@Url.Action( Delete )/' + Id } class = btn btn-danger >Delete</a> </td> </tr> </table> @section Scripts { <script> function ViewModel(authors) { var self = this ; self.authors = authors; }; var viewModel = new ViewModel(@Html.HtmlConvertToJson(Model))); ko.applyBindings(viewModel); </script> } I have added in the necessary library at the HTMLHelperExtension : using BootstrapIntroduction.Models; using Newtonsoft.Json; using System.Web; using System.Web.Mvc; namespace BootstrapIntroduction.HtmlHelperExtension { public static class HtmlHelpherExtensions { public static HtmlString HtmlConvertToJson( this HtmlHelper htmlHelper object model) { var settings = new JsonSerializerSettings { ReferenceLoopHandling = ReferenceLoopHandling.Ignore Formatting = Formatting.Indented }; return new HtmlString(JsonConvert.SerializeObject(model settings)); } } }

Hi Karen There is a small issue in the above snippet. In HtmlHelpherExtensions class removeHtmlHelperExtension from namespace namespace BootstrapIntroduction. HtmlHelperExtension and change the method as public static HtmlString HtmlConvertToJson (this HtmlHelper htmlHelper IEnumerable model) If the above solution is helpful then accept the answer.

Answers

does not contain a definition for HtmlConvertToJson

Tangara G

647

I am getting the below error which I can't find any solution in the internet :<br /><div> </div><div> </div><div>System.Collections.Generic.IEnumerable<>does not contain a definition for 'HtmlConvertToJson and no </div>extension method 'HtmlConvertToJson accepting a first argument of type 'System.Wev.Mvc.HtmlHelper<System.Collections.GenericIEnumerable<> could<br /><div>be found(are you missing a using directive or an assembly</div><div> </div><div>And this is the page where the error occurs at the line <span>new ViewModel(@Html.HtmlConvertToJson(Model)));</span></div><div> </div><div>Hope someone can help me out on this.<br /><div class="dp-highlighter"><ol class="dp-cpp" start="1"><li class="alt"><span><span>@model IEnumerable<BootstrapIntroduction.Models.Author>  </span></span></li><li class=""><span>  </span></li><li class="alt"><span>@{  </span></li><li class=""><span>    ViewBag.Title = <span class="string">"Authors"</span><span>;  </span></span></li><li class="alt"><span>}  </span></li><li class=""><span>  </span></li><li class="alt"><span><h2>Authors</h2>  </span></li><li class=""><span>  </span></li><li class="alt"><span><p>  </span></li><li class=""><span>    @Html.ActionLink(<span class="string">"Create New"</span><span>, </span><span class="string">"Create"</span><span>)  </span></span></li><li class="alt"><span></p>  </span></li><li class=""><span><table <span class="keyword">class</span><span>=</span><span class="string">"table table-bordered table-striped"</span><span>>  </span></span></li><li class="alt"><span>    <thead>  </span></li><li class=""><span>        <tr>  </span></li><li class="alt"><span>        <th>@Html.DisplayNameFor(model => model.FirstName) </th>  </span></li><li class=""><span>        <th>@Html.DisplayNameFor(model => model.LastName)  </th>  </span></li><li class="alt"><span>        <th>@Html.DisplayNameFor(model => model.Biography) </th>  </span></li><li class=""><span>        <th>Actions</th>  </span></li><li class="alt"><span>    </tr>  </span></li><li class=""><span>    </thead>  </span></li><li class="alt"><span>    <tbody data-bind=<span class="string">"foreach: authors"</span><span>>   </span></span></li><li class=""><span>    <tr>  </span></li><li class="alt"><span>        <td data-bind=<span class="string">"text: FirstName"</span><span>></td>  </span></span></li><li class=""><span>        <td data-bind=<span class="string">"text: LastName"</span><span>></td>  </span></span></li><li class="alt"><span>        <td>  </span></li><li class=""><span>            <a data-bind=<span class="string">"attr {href: '@Url.Action("</span><span>Details</span><span class="string">")/' + Id }"</span><span> </span><span class="keyword">class</span><span>=</span><span class="string">"btn btn-info"</span><span>>Details</a>  </span></span></li><li class="alt"><span>            <a data-bind=<span class="string">"attr {href: '@Url.Action("</span><span>Edit</span><span class="string">")/' + Id }"</span><span> </span><span class="keyword">class</span><span>=</span><span class="string">"btn btn-primary"</span><span>>Edit</a>  </span></span></li><li class=""><span>            <a data-bind=<span class="string">"attr: {href: '@Url.Action("</span><span>Delete</span><span class="string">")/' + Id }"</span><span> </span><span class="keyword">class</span><span>=</span><span class="string">"btn btn-danger"</span><span>>Delete</a>  </span></span></li><li class="alt"><span>        </td>  </span></li><li class=""><span>    </tr>  </span></li><li class="alt"><span></table>  </span></li><li class=""><span>  </span></li><li class="alt"><span>@section Scripts {  </span></li><li class=""><span>    <script>  </span></li><li class="alt"><span>        function ViewModel(authors) {  </span></li><li class=""><span>            var self = <span class="keyword">this</span><span>;  </span></span></li><li class="alt"><span>  </span></li><li class=""><span>            self.authors = authors;  </span></li><li class="alt"><span>        };  </span></li><li class=""><span>  </span></li><li class="alt"><span>        var viewModel = <span class="keyword">new</span><span> ViewModel(@Html.HtmlConvertToJson(Model)));  </span></span></li><li class=""><span>        ko.applyBindings(viewModel);  </span></li><li class="alt"><span>    </script>  </span></li><li class=""><span>}  <br /></span></li></ol></div></div><div>I have added in the necessary library at the HTMLHelperExtension :</div><div> </div><div> <div class="dp-highlighter"><ol class="dp-cpp" start="1"><li class="alt"><span><span class="keyword">using</span><span> BootstrapIntroduction.Models;  </span></span></li><li class=""><span><span class="keyword">using</span><span> Newtonsoft.Json;  </span></span></li><li class="alt"><span><span class="keyword">using</span><span> System.Web;  </span></span></li><li class=""><span><span class="keyword">using</span><span> System.Web.Mvc;  </span></span></li><li class="alt"><span>  </span></li><li class=""><span><span class="keyword">namespace</span><span> BootstrapIntroduction.HtmlHelperExtension  </span></span></li><li class="alt"><span>{  </span></li><li class=""><span>    <span class="keyword">public</span><span> </span><span class="keyword">static</span><span> </span><span class="keyword">class</span><span> HtmlHelpherExtensions  </span></span></li><li class="alt"><span>    {  </span></li><li class=""><span>        <span class="keyword">public</span><span> </span><span class="keyword">static</span><span> HtmlString HtmlConvertToJson(</span><span class="keyword">this</span><span> HtmlHelper htmlHelper, object model)  </span></span></li><li class="alt"><span>        {  </span></li><li class=""><span>            var settings = <span class="keyword">new</span><span> JsonSerializerSettings  </span></span></li><li class="alt"><span>            {  </span></li><li class=""><span>                ReferenceLoopHandling = ReferenceLoopHandling.Ignore,  </span></li><li class="alt"><span>                Formatting = Formatting.Indented  </span></li><li class=""><span>            };  </span></li><li class="alt"><span>  </span></li><li class=""><span>            <span class="keyword">return</span><span> </span><span class="keyword">new</span><span> HtmlString(JsonConvert.SerializeObject(model, settings));  </span></span></li><li class="alt"><span>        }  </span></li><li class=""><span>    }  </span></li><li class="alt"><span>}  <br /></span></li></ol></div></div><div> </div><div> </div><br /><div> </div><div> </div><div> </div><div> </div><div> </div>