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using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.IO;
using System.Web.Mvc.Properties;
using System.Web.WebPages;
namespace System.Web.Mvc
{
public abstract class WebViewPage : WebPageBase, IViewDataContainer, IViewStartPageChild
{
private ViewDataDictionary _viewData;
private DynamicViewDataDictionary _dynamicViewData;
private HttpContextBase _context;
public AjaxHelper<object> Ajax { get; set; }
public override HttpContextBase Context
{
// REVIEW why are we forced to override this?
get { return _context ?? ViewContext.HttpContext; }
set { _context = value; }
}
public HtmlHelper<object> Html { get; set; }
public object Model
{
get { return ViewData.Model; }
}
internal string OverridenLayoutPath { get; set; }
public TempDataDictionary TempData
{
get { return ViewContext.TempData; }
}
public UrlHelper Url { get; set; }
public dynamic ViewBag
{
get
{
if (_dynamicViewData == null)
{
_dynamicViewData = new DynamicViewDataDictionary(() => ViewData);
}
return _dynamicViewData;
}
}
public ViewContext ViewContext { get; set; }
[SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly", Justification = "This is the mechanism by which the ViewPage gets its ViewDataDictionary object.")]
public ViewDataDictionary ViewData
{
get
{
if (_viewData == null)
{
SetViewData(new ViewDataDictionary());
}
return _viewData;
}
set { SetViewData(value); }
}
protected override void ConfigurePage(WebPageBase parentPage)
{
var baseViewPage = parentPage as WebViewPage;
if (baseViewPage == null)
{
// TODO : review if this check is even necessary.
// When this method is called by the framework parentPage should already be an instance of WebViewPage
// Need to review what happens if this method gets called in Plan9 pointing at an MVC view
throw new InvalidOperationException(String.Format(CultureInfo.CurrentCulture, MvcResources.CshtmlView_WrongViewBase, parentPage.VirtualPath));
}
// Set ViewContext and ViewData here so that the layout page inherits ViewData from the main page
ViewContext = baseViewPage.ViewContext;
ViewData = baseViewPage.ViewData;
InitHelpers();
}
public override void ExecutePageHierarchy()
{
// Change the Writer so that things like Html.BeginForm work correctly
TextWriter oldWriter = ViewContext.Writer;
ViewContext.Writer = Output;
base.ExecutePageHierarchy();
// Overwrite LayoutPage so that returning a view with a custom master page works.
if (!String.IsNullOrEmpty(OverridenLayoutPath))
{
Layout = OverridenLayoutPath;
}
// Restore the old View Context Writer
ViewContext.Writer = oldWriter;
}
public virtual void InitHelpers()
{
Ajax = new AjaxHelper<object>(ViewContext, this);
Html = new HtmlHelper<object>(ViewContext, this);
Url = new UrlHelper(ViewContext.RequestContext);
}
protected virtual void SetViewData(ViewDataDictionary viewData)
{
_viewData = viewData;
}
}
}
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