How to declare a global variable in ASP.NET MVC page

Question

I've began working with asp.net mvc very recently and I've ran into a problem. I've got an aspx page which renders a few ascx pages. What I'd like to do is declare a global var at the aspx page so it is visible to all its childs. I tried <% var i = 0; %> but it wasn't visible at the child pages.

What could I do?

Stéphane · Accepted Answer · 2010-06-04 13:47:23Z

4

variables from a aspx page are not shared with the partial views. The view is just a representation of a piece of data. You have to pass the data as a Model to each view you want to render, whether it's a plain View or a PartialView.

<% Html.RenderPartial("ViewName", Model, ViewDataDictionnary) %>

If you want to pass a variable to a partial view, I would strongly recommend you to add this parameter to the model of the partial view, rather that to pass it additionally via the ViewDataDictionnary.

answered Jun 4, 2010 at 13:47

Stéphane

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2 Comments

Cloudy Over a year ago

Does this apply to two views inheriting from a shared view? If I were to declare and use a variable in the shared view, would I be able to override it in the inheriting views to change the output?

Stéphane Over a year ago

I'm not sure to understand the case related to this question, but the view is just a class that renders html. But the variable will still not be shared across different calls to RenderPartial since that would create different instance of the partial view.

moi_meme · Accepted Answer · 2010-06-04 13:45:58Z

0

You can add it to the ViewData and then pass the ViewData to the ascx with

<% Html.RenderPartial("ViewName", Model, ViewData) %>

see msdn on RenderPartial

So in your aspx page you'd do something like

<% ViewData["i"] = 0; %>

And in your userControl you'd just retrive it and use it as you want

<% int i = (int)ViewData["i"] %>

Another way would be to use RenderAction eand pass it as a parameter... so we'd need to know how you display your ascx.

see msdn on RenderAction

edited Jun 4, 2010 at 13:45

answered Jun 4, 2010 at 13:40

moi_meme

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