Go ASP. NET MVC Dynamic Themes

This article transferred from: Http://www.codeproject.com/Articles/32847/ASP-NET-MVC-Dynamic-Themes

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Introduction

I really needed to enable themes for my application, and I found a interesting article about it by Chris Pietschmann. In my point of view, the only problem and his approach are that need to repeat each page for all themes. Well, I is want to create one page per theme, and has a master page and CSS files for each theme.

Using the Code

For this project, I made some assumptions:

• The master page for each theme has the name Site.master.
• The master page file and CSS files is placed on a folder with the name of the theme.
• All the theme folders is placed in the Content folder.

The file structure would be as this:

Now, let's write a custom View Engine that would inherit from WebFormViewEngine . This code was only a sketch of that want to implement. For instance, I want to save the user theme selection so, in the next login, the user have his option set.

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PublicClass themeviewengine:webformviewengine{Public Themeviewengine () {Base. Viewlocationformats =NewString[] {"~/views/{1}/{0}.aspx ","~/views/{1}/{0}.ascx ","~/views/shared/{0}.aspx ","~/views/shared/{0}.ascx "};Base. Masterlocationformats =NewString[] {"~/content/{2}/site.master "};Base. Partialviewlocationformats =NewString[] {"~/views/{1}/{0}.aspx ","~/views/{1}/{0}.ascx ","~/views/shared/{0}.aspx ","~/views/shared/{0}.ascx "}; }PublicOverride Viewengineresult Findview (ControllerContext controllercontext,String ViewName,String mastername) {if (ControllerContext = =NULL) {ThrowNew ArgumentNullException ("ControllerContext "); }if (String. IsNullOrEmpty (ViewName)) {ThrowNew ArgumentException ("Value is required. ","ViewName "); }String themename =This. Getthemetouse (ControllerContext);String[] searchedviewlocations;String[] searchedmasterlocations;String controllername = ControllerContext.RouteData.GetRequiredString ("Controller ");String ViewPath =This. Getviewpath (This. Viewlocationformats, ViewName, Controllername,Out searchedviewlocations);String Masterpath =This. Getmasterpath (This. Masterlocationformats, ViewName, Controllername, ThemeName,Out searchedmasterlocations);if (! (String. IsNullOrEmpty (ViewPath)) && (! ( Masterpath = =String. Empty) | |String. IsNullOrEmpty (Mastername))) {ReturnNew Viewengineresult ((This. CreateView (ControllerContext, ViewPath, Masterpath)),this); }ReturnNew Viewengineresult (Searchedviewlocations.union<string> (searchedmasterlocations)); }PublicOverride Viewengineresult Findpartialview (ControllerContext controllercontext,String partialviewname) {if (ControllerContext = =NULL) {ThrowNew ArgumentNullException ("ControllerContext "); }if (String. IsNullOrEmpty (Partialviewname)) {ThrowNew ArgumentException ("Value is required. ", partialviewname); }String themename =This. Getthemetouse (ControllerContext);String[] searchedlocations;String controllername = ControllerContext.RouteData.GetRequiredString ("Controller ");String Partialpath =This. Getviewpath (This. Partialviewlocationformats, Partialviewname, Controllername,Out searchedlocations);if (String. IsNullOrEmpty (Partialpath)) {ReturnNew Viewengineresult (searchedlocations); }ReturnNew Viewengineresult (This. Createpartialview (ControllerContext, Partialpath),this); }PrivateString Getthemetouse (ControllerContext controllercontext) {if (ControllerContext.HttpContext.Request.QueryString.AllKeys.Contains ("Theme ")) {String themename = controllercontext.httpcontext.request.querystring["Theme "]; CONTROLLERCONTEXT.HTTPCONTEXT.SESSION.ADD ("Theme ", themename); }Elseif (controllercontext.httpcontext.session["Theme "] = =NULL) {CONTROLLERCONTEXT.HTTPCONTEXT.SESSION.ADD ("Theme ","Default "); }Return controllercontext.httpcontext.session["Theme "]. ToString (); }PrivateString Getviewpath (String[] locations,String ViewName,String Controllername,OutString[] searchedlocations) {String path =Null Searchedlocations =NewString[locations. Length];for (int i =0; I < locations. Length; i++) {Path =String. Format (CultureInfo.InvariantCulture, Locations[i),NewObject[] {viewName, controllername});if (This. Virtualpathprovider.fileexists (Path)) {searchedlocations =Newstring[0];return path; } Searchedlocations[i] = path; }ReturnNull }PrivateString Getmasterpath (String[] locations,String ViewName,String Controllername,String ThemeName,OutString[] searchedlocations) {string path = null; searchedlocations = new string[locations. Length]; for (int i = 0; i < locations. Length; i++) {path = string. Format (CultureInfo.InvariantCulture, locations[i], new  Object[] {viewName, controllername, themename}); if (this. Virtualpathprovider.fileexists (Path)) {searchedlocations = new string[0]; return Path;} Searchedlocations[i] = path; } return null;}        

To-finish this sample, just change the Global.asax, removing all engines from the View Engine and adding the Cust Om One:

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void Application_Start(){    RegisterRoutes(RouteTable.Routes);    ViewEngines.Engines.Clear();    ViewEngines.Engines.Add(new ThemeViewEngine());}

Well, hope that ' s useful.

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This article, along with any associated source code and files, is licensed under the Code Project Open License (Cpol)

Go ASP. NET MVC Dynamic Themes