MVC3 Basic C# programming question - Dynamic CRUD XML app - Issue

I've created an app with CRUD functions on XML documents with repository pattern. I have 4 models (4 xml files) with each a repository class. Before it was just 4 xml documents that were read into a XDocument object in the constructor.

 itemData = XDocument.Load(HttpContext.Current.Server.MapPath("~/App_Data/Items/item1.xml"));

Now I would like to make the xml file dynamic, so it can read unlimited xmls

So whats the best approach? Making a second constructor and passing in a parameter from the url? Something like this:

        public ItemRepository()
            {
            }

            public ItemRepository(string xml)
            {
             itemData = XDocument.Load(HttpContext.Current.Server.MapPath("~/App_Data/Items/" + xml + ".xml"));
                 ....
            }

Any other suggestions? Cos i get NullReferenceException with 开发者_JS百科the Model with this.

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I do not see anything bad with you approach except that the repository might accept directly the complete path to get its xml file. It would be just a bit cleaner way of writting it.

AS your NullReferenceException, only a thorough debug might help you. If your first statement was working , I do not see why the next one shouldn't, at least from the bits of code you have written here.

Good luck to you,

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Easiest workaround is to just out the code from the constructor into all the CRUD methods. Here a link for a little more info (and more issues :P) NullReferenceException while using XElement