Html Partial vs Html RenderPartial Html Action vs Html RenderAction

Question

In ASP NET MVC  what is the difference between    Html Partial and Html RenderPartial Html Action and Html RenderAction

User · Answer

According to me  Html RenderPartial   has faster execution than  Html Partial   due to Html RenderPartial gives a quick response to Output   Because when I use  Html Partial    my website takes more time to load compared to   Html RenderPartial

User · Answer

Partial or RenderPartial  No need to create action method  use when data to be display on the partial view is already present in model of current page   Action or RenderAction  Requires child action method  use when data to display on the view has independent model

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Html Partial returns a String  Html RenderPartial calls Write internally and returns void   The basic usage is      Razor syntax  Html Partial  ViewName      Html RenderPartial  ViewName           WebView syntax  lt    Html Partial  ViewName     gt   lt   Html RenderPartial  ViewName      gt    In the snippet above  both calls will yield the same result   While one can store the output of Html Partial in a variable or return it from a method  one cannot do this with Html RenderPartial      The result will be written to the Response stream during execution evaluation   This also applies to Html Action and Html RenderAction

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Here is what I have found   Use RenderAction when you do not have a model to send to the view and have a lot of html to bring back that doesn t need to be stored in a variable   Use Action when you do not have a model to send to the view and have a little bit of text to bring back that needs to be stored in a variable   Use RenderPartial when you have a model to send to the view and there will be a lot of html that doesn t need to be stored in a variable   Use Partial when you have a model to send to the view and there will be a little bit of text that needs to be stored in a variable   RenderAction and RenderPartial are faster

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Differences    The return type of RenderPartial is void  where as Partial returns MvcHtmlString Syntax for invoking Partial   and RenderPartial   methods in Razor views      Html Partial  PartialViewName        Html RenderPartial  PartialViewName       Syntax for invoking Partial   and RenderPartial   methods in webform views          Html Partial  PartialViewName            Html RenderPartial  PartialViewName         The following are the 2 common interview questions related to Partial   and RenderPartial   When would you use Partial   over RenderPartial   and vice versa   The main difference is that RenderPartial   returns void and the output will be written directly to the output stream  where as the Partial   method returns MvcHtmlString  which can be assigned to a variable and manipulate it if required  So  when there is a need to assign the output to a variable for manipulating it  then use Partial    else use RenderPartial     Which one is better for performance   From a performance perspective  rendering directly to the output stream is better  RenderPartial   does exactly the same thing and is better for performance over Partial

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Think of  Html Partial as HTML code copied into the parent page  Think of  Html RenderPartial as an  ascx user control incorporated into the parent page   An  ascx user control has far more overhead     Html Partial  returns a html encoded string that gets constructed inline with the parent   It accesses the parent s model     Html RenderPartial  returns the equivalent of a  ascx user control   It gets its own copy of the page s ViewDataDictionary and changes made to the RenderPartial s ViewData do not effect the parent s ViewData   Using reflection we find   public static MvcHtmlString Partial this HtmlHelper htmlHelper  string partialViewName  object model  ViewDataDictionary viewData        MvcHtmlString mvcHtmlString      using  StringWriter stringWriter   new StringWriter CultureInfo CurrentCulture                 htmlHelper RenderPartialInternal partialViewName  viewData  model  stringWriter  ViewEngines Engines           mvcHtmlString   MvcHtmlString Create stringWriter ToString               return mvcHtmlString     public static void RenderPartial this HtmlHelper htmlHelper  string partialViewName        htmlHelper RenderPartialInternal partialViewName  htmlHelper ViewData  null  htmlHelper ViewContext Writer  ViewEngines Engines

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Html Partial returns view in HTML-encoded string and use same view TextWriter object   Html RenderPartial this method return void   Html RenderPartial is faster than  Html Partial  The syntax for PartialView     HttpGet    public ActionResult AnyActionMethod         return PartialView

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For  partial  I always use it as follows   If there s something you need to include in a page that you need to go via the controller  like you would with an Ajax call  then use  Html RenderPartial     If you have a  static  include that isn t linked to a controller per-se and just in the  shared  folder for example  use  HTML partial

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Difference is first one returns an MvcHtmlString but second  Render    outputs straight to the response

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More about the question       When Html RenderPartial   is called with just the name of the partial   view  ASP NET MVC will pass to the partial view the same Model and   ViewData dictionary objects used by the calling view template        NerdDinner    from Professional ASP NET MVC 1 0

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The return type of Html RenderAction is void that means it directly renders the responses in View where the return type of Html Action is  MvcHtmlString You can catch its render view in controller and modify it by using following method   protected string RenderPartialViewToString string viewName  object model                if  string IsNullOrEmpty viewName               viewName   ControllerContext RouteData GetRequiredString  action             ViewData Model   model           using  StringWriter sw   new StringWriter                          ViewEngineResult viewResult   ViewEngines Engines FindPartialView ControllerContext  viewName               ViewContext viewContext   new ViewContext ControllerContext  viewResult View  ViewData  TempData  sw               viewResult View Render viewContext  sw               return sw GetStringBuilder   ToString                      This will return the Html string of the View   This is also applicable to Html Partial and Html RenderPartial

User · Answer

Html Partial  returns MvcHtmlString and slow  Html RenderPartial  directly render write on output stream and returns void and it s very fast in comparison to Html Partial

User · Answer

Html Partial and  Html RenderPartial are used when your Partial view model is correspondence of parent model  we don t need to create any action method to call this    Html Action and  Html RenderAction are used when your partial view model are independent from parent model  basically it is used when you want to display any widget type content on page  You must create an action method which returns a partial view result while calling the method from view

[.net] Html.Partial vs Html.RenderPartial & Html.Action vs Html.RenderAction

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