}  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));           }       }   }", "answerCount": 2, "datePublished": "2016-07-08T03:14+00:00", "author": { "@type": "Person", "name": "Tangara G", "url": "https://test.c-sharpcorner.com/members/karen-goh" } , "suggestedAnswer": [ { "@type": "Answer", "text": " 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. ", "upvoteCount": 1, "url": "https://test.c-sharpcorner.com/forums/does-not-contain-a-definition-for-htmlconverttojson", "datePublished": "2016-07-08T05:55+00:00", "author": { "@type": "Person", "name": "Rajeev Punhani", "url": "https://test.c-sharpcorner.com/members/rajeev-punhani2" } }, { "@type": "Answer", "text": "thanks, this helped me also.", "upvoteCount": 0, "url": "https://test.c-sharpcorner.com/forums/does-not-contain-a-definition-for-htmlconverttojson", "datePublished": "2016-07-11T12:15+00:00", "author": { "@type": "Person", "name": "Rising Son", "url": "https://test.c-sharpcorner.com/members/rising-son" } } ] } }
2
Answers

does not contain a definition for HtmlConvertToJson

Tangara G

Tangara G
8y
652
1
I am getting the below error which I can't find any solution in the internet :<br /><div> </div><div>&nbsp;</div><div>System.Collections.Generic.IEnumerable&lt;&gt;does not contain a definition for 'HtmlConvertToJson and no </div>extension method 'HtmlConvertToJson accepting a first argument of type 'System.Wev.Mvc.HtmlHelper&lt;System.Collections.GenericIEnumerable&lt;&gt; could<br /><div>be found(are you missing a using directive or an assembly</div><div>&nbsp;</div><div>And this is the page where the error occurs at the line <span>new ViewModel(@Html.HtmlConvertToJson(Model)));</span></div><div>&nbsp;</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&nbsp;IEnumerable&lt;BootstrapIntroduction.Models.Author&gt;&nbsp;&nbsp;</span></span></li><li class=""><span>&nbsp;&nbsp;</span></li><li class="alt"><span>@{&nbsp;&nbsp;</span></li><li class=""><span>&nbsp;&nbsp;&nbsp;&nbsp;ViewBag.Title&nbsp;=&nbsp;<span class="string">"Authors"</span><span>;&nbsp;&nbsp;</span></span></li><li class="alt"><span>}&nbsp;&nbsp;</span></li><li class=""><span>&nbsp;&nbsp;</span></li><li class="alt"><span>&lt;h2&gt;Authors&lt;/h2&gt;&nbsp;&nbsp;</span></li><li class=""><span>&nbsp;&nbsp;</span></li><li class="alt"><span>&lt;p&gt;&nbsp;&nbsp;</span></li><li class=""><span>&nbsp;&nbsp;&nbsp;&nbsp;@Html.ActionLink(<span class="string">"Create&nbsp;New"</span><span>,&nbsp;</span><span class="string">"Create"</span><span>)&nbsp;&nbsp;</span></span></li><li class="alt"><span>&lt;/p&gt;&nbsp;&nbsp;</span></li><li class=""><span>&lt;table&nbsp;<span class="keyword">class</span><span>=</span><span class="string">"table&nbsp;table-bordered&nbsp;table-striped"</span><span>&gt;&nbsp;&nbsp;</span></span></li><li class="alt"><span>&nbsp;&nbsp;&nbsp;&nbsp;&lt;thead&gt;&nbsp;&nbsp;</span></li><li class=""><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;tr&gt;&nbsp;&nbsp;</span></li><li class="alt"><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;th&gt;@Html.DisplayNameFor(model&nbsp;=&gt;&nbsp;model.FirstName)&nbsp;&lt;/th&gt;&nbsp;&nbsp;</span></li><li class=""><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;th&gt;@Html.DisplayNameFor(model&nbsp;=&gt;&nbsp;model.LastName)&nbsp;&nbsp;&lt;/th&gt;&nbsp;&nbsp;</span></li><li class="alt"><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;th&gt;@Html.DisplayNameFor(model&nbsp;=&gt;&nbsp;model.Biography)&nbsp;&lt;/th&gt;&nbsp;&nbsp;</span></li><li class=""><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;th&gt;Actions&lt;/th&gt;&nbsp;&nbsp;</span></li><li class="alt"><span>&nbsp;&nbsp;&nbsp;&nbsp;&lt;/tr&gt;&nbsp;&nbsp;</span></li><li class=""><span>&nbsp;&nbsp;&nbsp;&nbsp;&lt;/thead&gt;&nbsp;&nbsp;</span></li><li class="alt"><span>&nbsp;&nbsp;&nbsp;&nbsp;&lt;tbody&nbsp;data-bind=<span class="string">"foreach:&nbsp;authors"</span><span>&gt;&nbsp;&nbsp;&nbsp;</span></span></li><li class=""><span>&nbsp;&nbsp;&nbsp;&nbsp;&lt;tr&gt;&nbsp;&nbsp;</span></li><li class="alt"><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;td&nbsp;data-bind=<span class="string">"text:&nbsp;FirstName"</span><span>&gt;&lt;/td&gt;&nbsp;&nbsp;</span></span></li><li class=""><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;td&nbsp;data-bind=<span class="string">"text:&nbsp;LastName"</span><span>&gt;&lt;/td&gt;&nbsp;&nbsp;</span></span></li><li class="alt"><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;td&gt;&nbsp;&nbsp;</span></li><li class=""><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;a&nbsp;data-bind=<span class="string">"attr&nbsp;{href:&nbsp;'@Url.Action("</span><span>Details</span><span class="string">")/'&nbsp;+&nbsp;Id&nbsp;}"</span><span>&nbsp;</span><span class="keyword">class</span><span>=</span><span class="string">"btn&nbsp;btn-info"</span><span>&gt;Details&lt;/a&gt;&nbsp;&nbsp;</span></span></li><li class="alt"><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;a&nbsp;data-bind=<span class="string">"attr&nbsp;{href:&nbsp;'@Url.Action("</span><span>Edit</span><span class="string">")/'&nbsp;+&nbsp;Id&nbsp;}"</span><span>&nbsp;</span><span class="keyword">class</span><span>=</span><span class="string">"btn&nbsp;btn-primary"</span><span>&gt;Edit&lt;/a&gt;&nbsp;&nbsp;</span></span></li><li class=""><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;a&nbsp;data-bind=<span class="string">"attr:&nbsp;{href:&nbsp;'@Url.Action("</span><span>Delete</span><span class="string">")/'&nbsp;+&nbsp;Id&nbsp;}"</span><span>&nbsp;</span><span class="keyword">class</span><span>=</span><span class="string">"btn&nbsp;btn-danger"</span><span>&gt;Delete&lt;/a&gt;&nbsp;&nbsp;</span></span></li><li class="alt"><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&lt;/td&gt;&nbsp;&nbsp;</span></li><li class=""><span>&nbsp;&nbsp;&nbsp;&nbsp;&lt;/tr&gt;&nbsp;&nbsp;</span></li><li class="alt"><span>&lt;/table&gt;&nbsp;&nbsp;</span></li><li class=""><span>&nbsp;&nbsp;</span></li><li class="alt"><span>@section&nbsp;Scripts&nbsp;{&nbsp;&nbsp;</span></li><li class=""><span>&nbsp;&nbsp;&nbsp;&nbsp;&lt;script&gt;&nbsp;&nbsp;</span></li><li class="alt"><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;function&nbsp;ViewModel(authors)&nbsp;{&nbsp;&nbsp;</span></li><li class=""><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;self&nbsp;=&nbsp;<span class="keyword">this</span><span>;&nbsp;&nbsp;</span></span></li><li class="alt"><span>&nbsp;&nbsp;</span></li><li class=""><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;self.authors&nbsp;=&nbsp;authors;&nbsp;&nbsp;</span></li><li class="alt"><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;};&nbsp;&nbsp;</span></li><li class=""><span>&nbsp;&nbsp;</span></li><li class="alt"><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;viewModel&nbsp;=&nbsp;<span class="keyword">new</span><span>&nbsp;ViewModel(@Html.HtmlConvertToJson(Model)));&nbsp;&nbsp;</span></span></li><li class=""><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ko.applyBindings(viewModel);&nbsp;&nbsp;</span></li><li class="alt"><span>&nbsp;&nbsp;&nbsp;&nbsp;&lt;/script&gt;&nbsp;&nbsp;</span></li><li class=""><span>}&nbsp; <br /></span></li></ol></div></div><div>I have added in the necessary library at the HTMLHelperExtension :</div><div>&nbsp;</div><div>&nbsp;<div class="dp-highlighter"><ol class="dp-cpp" start="1"><li class="alt"><span><span class="keyword">using</span><span>&nbsp;BootstrapIntroduction.Models;&nbsp;&nbsp;</span></span></li><li class=""><span><span class="keyword">using</span><span>&nbsp;Newtonsoft.Json;&nbsp;&nbsp;</span></span></li><li class="alt"><span><span class="keyword">using</span><span>&nbsp;System.Web;&nbsp;&nbsp;</span></span></li><li class=""><span><span class="keyword">using</span><span>&nbsp;System.Web.Mvc;&nbsp;&nbsp;</span></span></li><li class="alt"><span>&nbsp;&nbsp;</span></li><li class=""><span><span class="keyword">namespace</span><span>&nbsp;BootstrapIntroduction.HtmlHelperExtension&nbsp;&nbsp;</span></span></li><li class="alt"><span>{&nbsp;&nbsp;</span></li><li class=""><span>&nbsp;&nbsp;&nbsp;&nbsp;<span class="keyword">public</span><span>&nbsp;</span><span class="keyword">static</span><span>&nbsp;</span><span class="keyword">class</span><span>&nbsp;HtmlHelpherExtensions&nbsp;&nbsp;</span></span></li><li class="alt"><span>&nbsp;&nbsp;&nbsp;&nbsp;{&nbsp;&nbsp;</span></li><li class=""><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="keyword">public</span><span>&nbsp;</span><span class="keyword">static</span><span>&nbsp;HtmlString&nbsp;HtmlConvertToJson(</span><span class="keyword">this</span><span>&nbsp;HtmlHelper&nbsp;htmlHelper,&nbsp;object&nbsp;model)&nbsp;&nbsp;</span></span></li><li class="alt"><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{&nbsp;&nbsp;</span></li><li class=""><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;settings&nbsp;=&nbsp;<span class="keyword">new</span><span>&nbsp;JsonSerializerSettings&nbsp;&nbsp;</span></span></li><li class="alt"><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{&nbsp;&nbsp;</span></li><li class=""><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ReferenceLoopHandling&nbsp;=&nbsp;ReferenceLoopHandling.Ignore,&nbsp;&nbsp;</span></li><li class="alt"><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Formatting&nbsp;=&nbsp;Formatting.Indented&nbsp;&nbsp;</span></li><li class=""><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;};&nbsp;&nbsp;</span></li><li class="alt"><span>&nbsp;&nbsp;</span></li><li class=""><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span class="keyword">return</span><span>&nbsp;</span><span class="keyword">new</span><span>&nbsp;HtmlString(JsonConvert.SerializeObject(model,&nbsp;settings));&nbsp;&nbsp;</span></span></li><li class="alt"><span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}&nbsp;&nbsp;</span></li><li class=""><span>&nbsp;&nbsp;&nbsp;&nbsp;}&nbsp;&nbsp;</span></li><li class="alt"><span>}&nbsp; <br /></span></li></ol></div></div><div>&nbsp;</div><div>&nbsp;</div><br /><div>&nbsp;</div><div>&nbsp;</div><div>&nbsp;</div><div>&nbsp;</div><div>&nbsp;</div>
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