Question

我正在考虑实施自定义RazorViewEngine。基本上我有两个有效相同代码库的站点。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。所以我希望View Engine在位置B中查看视图，布局，主控或部分，如果它找到它然后返回它，如果找不到它我希望它默认为公司A的视图作为默认值。显然，公司A只会查看它自己的文件夹。

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

第一个问题，这是实现这一目标的最佳方式吗？

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

更新

好的，我自己想出了第二个问题，我要覆盖的方法是CreateView和CreatePartialView，因为此时它构建了视图字符串，我可以摆弄它。

Answer 1

好的，我最后选择了详细的方法：http://weblogs.asp.net/imranbaloch/archive/2011/06/27/view-engine-with-dynamic-view-location.aspx

感谢@Adriano的答案和指示，但最后我认为这种方法更符合我的需求。下面的方法允许我保留标准功能，但是要创建一个新的更高优先级的视图位置进行搜索。

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

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());
}

Answer 2

是的，但是你不需要覆盖那些方法。 RazorViewEngine继承自VirtualPathProviderViewEngine，因此您可以使用其属性设置视图的位置。

有关示例，请阅读Creating your first MVC ViewEngine和How to set a Default Route (To an Area) in MVC。

Answer 3

这是我的答案：将其添加到您的global.ascx

        ViewEngines.Engines.Clear();
        var customEngine = new RazorViewEngine();
        customEngine.PartialViewLocationFormats = new string[]
        {
            "~/Views/{1}/{0}.cshtml",
            "~/Views/Shared/{0}.cshtml",
            "~/Views/Partial/{0}.cshtml",
            "~/Views/Partial/{1}/{0}.cshtml"
        };



        customEngine.ViewLocationFormats = new string[]
        {
            "~/Views/{1}/{0}.cshtml",
            "~/Views/Shared/{0}.cshtml",
            "~/Views/Controller/{1}/{0}.cshtml"
        };

        customEngine.MasterLocationFormats = new string[]
        {
            "~/Views/Shared/{0}.cshtml",
            "~/Views/Layout/{0}.cshtml"
        };

        ViewEngines.Engines.Add(customEngine);

这些是剃刀检查你的观点的文件夹。

让我知道这是否有效。

如何实现自定义RazorViewEngine以在非标准位置查找视图？

3 个答案: