如何实现自定义 RazorViewEngine 以在非标准位置查找视图?

问题描述

我正在考虑实现一个自定义的 RazorViewEngine.基本上，我有两个具有相同代码库的站点.不同之处在于它们看起来不同.我想覆盖标准视图引擎，使 MVC 在两个不同的位置查看它的视图、布局等.一个用于公司 A，另一个用于公司 B.公司 A 将包含主视图，公司 B 的视图将覆盖这些主视图.因此，我希望视图引擎在位置 B 中查找视图、布局、主视图或部分视图，如果找到它然后返回它，如果它没有找到它我希望它默认为公司 A 的视图作为默认值.显然，A 公司只会在它自己的文件夹中查看.

I'm looking at implementing a custom RazorViewEngine. Basically I have two sites with effectively the same code base. The differences being that they look different. I want to override the standard view engine to make MVC look in two separate locations for it's views, layouts, etc. one for company A and another for Company B. Company A will contain the master views and company B's view will override these masters. So I want the View Engine to look in location B for a view, layout, master or partial if it finds it then return it, if it doesn't find it I want it to default to company A's views as the default. Obviously company A will only look in it's own folder.

好的，问题的关键:我找到了这个网站:http://www.aspnetwiki.com/mvc-3-razor:extending-the-view-engine

Ok to the crux of the question:I've found this site: http://www.aspnetwiki.com/mvc-3-razor:extending-the-view-engine

第一个问题，这是实现这一目标的最佳方式吗?

First question, is this the best way to achieve this?

第二，我是否需要覆盖 CreatePartial、CreateView、FindPartial 和 FindView 方法?

Second do I need to override the CreatePartial, CreateView, FindPartial and FindView methods?

更新

好的，我自己想出了第二个问题，我想覆盖的方法是 CreateView 和 CreatePartialView 因为此时它已经构建了视图字符串，我可以摆弄它.

Ok I've figured out the second question myself, the Methods I want to override are CreateView and CreatePartialView as at this point it's built the view string and I can fiddle with it.

推荐答案

好吧，最后我选择了这里详述的方法:http://weblogs.asp.net/imranbaloch/archive/2011/06/27/view-engine-with-动态视图位置.aspx

Ok in the end I opted for an approach detailed here: http://weblogs.asp.net/imranbaloch/archive/2011/06/27/view-engine-with-dynamic-view-location.aspx

感谢@Adriano 的回答和指点，但最终我认为这种方法更适合我的需求.下面的方法允许我保留标准功能，但创建一个新的更高优先级的视图位置以供搜索.

thanks to @Adriano for the answers and pointers but in the end I think this approach fits my needs better. The approach below allows me to keep the standard functionality but to create a new higher priority view location to be searched.

public class Travel2ViewEngine : RazorViewEngine
{
    protected BrandNameEnum BrandName;
    private string[] _newAreaViewLocations = new string[] {
        "~/Areas/{2}/%1Views/{1}/{0}.cshtml",
        "~/Areas/{2}/%1Views/{1}/{0}.vbhtml",
        "~/Areas/{2}/%1Views//Shared/{0}.cshtml",
        "~/Areas/{2}/%1Views//Shared/{0}.vbhtml"
    };

    private string[] _newAreaMasterLocations = new string[] {
        "~/Areas/{2}/%1Views/{1}/{0}.cshtml",
        "~/Areas/{2}/%1Views/{1}/{0}.vbhtml",
        "~/Areas/{2}/%1Views/Shared/{0}.cshtml",
        "~/Areas/{2}/%1Views/Shared/{0}.vbhtml"
    };

    private string[] _newAreaPartialViewLocations = new string[] {
        "~/Areas/{2}/%1Views/{1}/{0}.cshtml",
        "~/Areas/{2}/%1Views/{1}/{0}.vbhtml",
        "~/Areas/{2}/%1Views/Shared/{0}.cshtml",
        "~/Areas/{2}/%1Views/Shared/{0}.vbhtml"
    };

    private string[] _newViewLocations = new string[] {
        "~/%1Views/{1}/{0}.cshtml",
        "~/%1Views/{1}/{0}.vbhtml",
        "~/%1Views/Shared/{0}.cshtml",
        "~/%1Views/Shared/{0}.vbhtml"
    };

    private string[] _newMasterLocations = new string[] {
        "~/%1Views/{1}/{0}.cshtml",
        "~/%1Views/{1}/{0}.vbhtml",
        "~/%1Views/Shared/{0}.cshtml",
        "~/%1Views/Shared/{0}.vbhtml"
    };

    private string[] _newPartialViewLocations = new string[] {
        "~/%1Views/{1}/{0}.cshtml",
        "~/%1Views/{1}/{0}.vbhtml",
        "~/%1Views/Shared/{0}.cshtml",
        "~/%1Views/Shared/{0}.vbhtml"
    };

    public Travel2ViewEngine()
        : base()
    {
        Enum.TryParse<BrandNameEnum>(Travel2.WebUI.Properties.Settings.Default.BrandName, out BrandName);

        AreaViewLocationFormats = AppendLocationFormats(_newAreaViewLocations, AreaViewLocationFormats);

        AreaMasterLocationFormats = AppendLocationFormats(_newAreaMasterLocations, AreaMasterLocationFormats);

        AreaPartialViewLocationFormats = AppendLocationFormats(_newAreaPartialViewLocations, AreaPartialViewLocationFormats);

        ViewLocationFormats = AppendLocationFormats(_newViewLocations, ViewLocationFormats);

        MasterLocationFormats = AppendLocationFormats(_newMasterLocations, MasterLocationFormats);

        PartialViewLocationFormats = AppendLocationFormats(_newPartialViewLocations, PartialViewLocationFormats);
    }

    private string[] AppendLocationFormats(string[] newLocations, string[] defaultLocations)
    {
        List<string> viewLocations = new List<string>();
        viewLocations.AddRange(newLocations);
        viewLocations.AddRange(defaultLocations);
        return viewLocations.ToArray();
    }

    protected override IView CreateView(ControllerContext controllerContext, string viewPath, string masterPath)
    {
        return base.CreateView(controllerContext, viewPath.Replace("%1", BrandName.ToString()), masterPath);
    }

    protected override IView CreatePartialView(ControllerContext controllerContext, string partialPath)
    {
        return base.CreatePartialView(controllerContext, partialPath.Replace("%1", BrandName.ToString()));
    }

    protected override bool FileExists(ControllerContext controllerContext, string virtualPath)
    {
        return base.FileExists(controllerContext, virtualPath.Replace("%1", BrandName.ToString()));
    }
}

然后在 Gloabal.asax 中注册

then register in Gloabal.asax

protected void Application_Start(object sender, EventArgs e)
{
    RegisterRoutes(RouteTable.Routes);


    //Register our customer view engine to control T2 and TBag views and over ridding
    ViewEngines.Engines.Clear();
    ViewEngines.Engines.Add(new Travel2ViewEngine());
}

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