Why use ASP.NET MVC partial View (.ascx)?
As @Brandon points out you use PartialViews for reusability and readability Take for example a scenario where you have an IQueryable list of contacts You would have a partial view which looped through the list and a partial view which rendered the items When you do it that way, you could write code that enabled the looping partial view to decide which partial view should render the contact if there are more than a single way to represent the data If you then place those partial views in a shared fodler they can be used throughout the entire application Also, you can use an AJAX/jQuery call to a controllers action. That action would then return a PartialView which can then be displayed on screen. Makes your site look very slick when you don't refresh the entire page.
As @Brandon points out you use PartialViews for reusability and readability. Take for example a scenario where you have an IQueryable list of contacts. You would have a partial view which looped through the list and a partial view which rendered the items.
When you do it that way, you could write code that enabled the looping partial view to decide which partial view should render the contact if there are more than a single way to represent the data. If you then place those partial views in a shared fodler they can be used throughout the entire application. Also, you can use an AJAX/jQuery call to a controllers action.
That action would then return a PartialView which can then be displayed on screen. Makes your site look very slick when you don't refresh the entire page.
The two main reasons would be reusability and readability. If you plan on having the same information in multiple pages, put it in a View, just like you do with UserControls in WebForms. If your page is going to be massive, then it might also be a good idea to break out sections into Views.
They'll be smaller and easier to read and maintain. As for creating a view specifically "for a controller method", I personally don't ever create a partial view with the intent to use it directly as the result of a controller method. It usually comes later when you realize you may need to start moving some things around.
2 Another reason might be to render data that are served using ajax, but the user has javascript turned off. So it would appear another way. – Trimack Jan 21 '10 at 22:36.
You can use Partial Pages(.ascx files) for : Implementing sidebar with common links across multiple pages in a website. Avoid template duplication(as explained in NerdDinner example) The intention for using partial pages is to follow Do Not Repeat Yourself(DRY) principle. Instead of repeating the output view multiple times, a Partial View can be created.
This improves re usability and readability.
A social networking component used on multiple pages, such as a Facebook Like button. While ASP.NET MVC partial views may behave similarly in theory to web user controls, syntactically and functionally, the two behave differently. Web user controls found in web forms uses ViewState, PostBacks, and Events while MVC partial views do not use any of the preceding techniques for managing state.
Just as ASP.NET web user controls do, partial views can tap into the models contained in your application as well as share data between other application components. Partial views in ASP.NET MVC 3 allow the developer to create reusable content with the very precise and clean Razor syntax (or ASPX). The syntax that renders the partial view is implemented as an Html helper.
Partial helper renders the partial view named "_FeaturedProduct" inline. The first argument of all overloaded methods in the call the @Html. Partial expect the view/partial's file name, without the file extension.
Adhering to convention, the @Html. Partial helper assumes the view resides in the \Views\Shared\ folder. Additional overloads in the @Html.
Partial method allow you to pass ViewData/ViewBag objects between views/partials (see below under Sharing data...). The code below demonstrates the call to render the featured product partial view. Partial views can be rendered inside a Layout Page (or if using MVC 2/3 w/ASPX, the Master Page) as well as regular views.
There are some cases where you might like to step aside and write directly to the HTTP Response stream rather than having a partial view render the results (partials/views use MvcHtmlString/StringWriter). To do so, use the Html. @Html.
RenderPartial for streaming images or other elements that are media-centric or where faster download times are highly important. Both partial views and regular views are . Cshtml files, with the difference being the folder where the partial views reside: \Views\Shared\.
Use the Add New View dialog by accessing the context menu from the \Views\Shared node in Solution Explorer. The Add New View template dialog offers choices for creating your partial views, including the option for strongly typing views. Don't forget to check off "Create as a partial view" or you'll end up with a lot of code to delete.
Once you've created the view you can get started customizing it by simply editing the file. There's no problem in deleting or modifying the view's code, as there's no designer tied to it. The code shown below (_FeaturedProduct.
FeaturedProduct {border: solid 1px #000} Our Featured product: @ViewBag.FeaturedProduct.Name Now discounted to $@String. Price)-100) @Html. ActionLink("Featured Product Details", "Details", new { id = ViewBag.FeaturedProduct.
ProductId }) The important take-away is not about the syntax but how the partial view is used. However, a syntactic benefit to developers is the consistency between both partial and full views, particularly when we need to share data between them. It's a common occurrence to pass data between components of an application, and in this case those components are MVC partials, views & controllers.
As previously noted, you should use the ViewBag or ViewData classes to share data across views and controllers. ViewData was available in previous versions; ViewBag was released with MVC 3. ViewData can contain any type of data in a name-value pair format.
ViewBag objects are just wrappers around ViewData objects, and allow developers to code to them using strongly typed syntax. ViewBag objects can be extended by simply setting properties in a more fluent syntax. If code in a controller uses either the ViewBag or ViewData classes, those classes will be available throughout the view's lifecycle, and that includes its partial views.
The preferable object is the ViewBag. Because of its more fluent and dynamic syntax, there's more complex objects that can be shared quite easily between components. Partial views are a great way to reuse fragments of HTML and Razor syntax together, with the ability to easily share data.
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