如何在 MVC 5 中创建多租户视图结构

Question

我正在构建一个演示项目，其中多个租户将拥有自己的视图集合。此外，如果租户没有专门的视图，则默认视图集合将可用。我看过多个关于使用多租户进行代码方面的教程，其中每个租户都有自己的数据库。但是view方面好像有点欠缺

在伪代码中：

Get Me the User information view
Get tentantname from current context
Check /views/{tentantname}/userinfo/index.cshtml
if found return /views/{tentantname}/userinfo/index.cshtml
else return /views/base/userinfo/index.html

我不确定在哪里处理这段代码？（创建一个基本控制器来覆盖对视图的调用）我应该创建自己的 RazorViewEngine 版本吗？
这是在路由配置中处理的吗？（这是更多的控制器路由然后在哪里寻找视图）需要覆盖什么方法？

我找到了有关更改所有视图的基本目录的教程，但我希望根据具体情况处理每个视图的查找。在运行请求的当前上下文中利用一个值。

参考第一个答案进行编辑。

对 RazorViewEngine 所做的更改删除了示例中使用的许多可重写方法。同一作者添加了更新 http://weblogs.asp.net/imranbaloch/custom-viewengine-aspnet5-mvc6 但是这个版本没有进入视图位置检查和重写。我认为答案是传递给构造函数的参数之一。我认为如果可以覆盖它们我可以完成我的任务。这是元数据中的 RazorViewEngine：

//
// Summary:
//     Default implementation of Microsoft.AspNet.Mvc.Razor.IRazorViewEngine.
//
// Remarks:
//     For ViewResults returned from controllers, views should be located in Microsoft.AspNet.Mvc.Razor.RazorViewEngine.ViewLocationFormats
//     by default. For the controllers in an area, views should exist in Microsoft.AspNet.Mvc.Razor.RazorViewEngine.AreaViewLocationFormats.
public class RazorViewEngine : IRazorViewEngine, IViewEngine
{
    //
    // Summary:
    //     Initializes a new instance of the Microsoft.AspNet.Mvc.Razor.RazorViewEngine
    //     class.
    //
    // Parameters:
    //   pageFactory:
    //     The page factory used for creating Microsoft.AspNet.Mvc.Razor.IRazorPage instances.
    public RazorViewEngine(IRazorPageFactory pageFactory, IRazorViewFactory viewFactory, IOptions<RazorViewEngineOptions> optionsAccessor, IViewLocationCache viewLocationCache);

    //
    // Summary:
    //     Gets the locations where this instance of Microsoft.AspNet.Mvc.Razor.RazorViewEngine
    //     will search for views within an area.
    //
    // Remarks:
    //     The locations of the views returned from controllers that belong to an area.
    //     Locations are composite format strings (see http://msdn.microsoft.com/en-us/library/txafckwd.aspx),
    //     which contains following indexes: {0} - Action Name {1} - Controller Name {2}
    //     - Area name The values for these locations are case-sensitive on case-senstive
    //     file systems. For example, the view for the Test action of HomeController should
    //     be located at /Views/Home/Test.cshtml. Locations such as /views/home/test.cshtml
    //     would not be discovered
    public virtual IEnumerable<string> AreaViewLocationFormats { get; }
    //
    // Summary:
    //     Gets the locations where this instance of Microsoft.AspNet.Mvc.Razor.RazorViewEngine
    //     will search for views.
    //
    // Remarks:
    //     The locations of the views returned from controllers that do not belong to an
    //     area. Locations are composite format strings (see http://msdn.microsoft.com/en-us/library/txafckwd.aspx),
    //     which contains following indexes: {0} - Action Name {1} - Controller Name The
    //     values for these locations are case-sensitive on case-senstive file systems.
    //     For example, the view for the Test action of HomeController should be located
    //     at /Views/Home/Test.cshtml. Locations such as /views/home/test.cshtml would not
    //     be discovered
    public virtual IEnumerable<string> ViewLocationFormats { get; }

    //
    // Summary:
    //     Gets the case-normalized route value for the specified route key.
    //
    // Parameters:
    //   context:
    //     The Microsoft.AspNet.Mvc.ActionContext.
    //
    //   key:
    //     The route key to lookup.
    //
    // Returns:
    //     The value corresponding to the key.
    //
    // Remarks:
    //     The casing of a route value in Microsoft.AspNet.Mvc.ActionContext.RouteData is
    //     determined by the client. This making constructing paths for view locations in
    //     a case sensitive file system unreliable. Using the Microsoft.AspNet.Mvc.Abstractions.ActionDescriptor.RouteValueDefaults
    //     for attribute routes and Microsoft.AspNet.Mvc.Abstractions.ActionDescriptor.RouteConstraints
    //     for traditional routes to get route values produces consistently cased results.
    public static string GetNormalizedRouteValue(ActionContext context, string key);
    //
    public RazorPageResult FindPage(ActionContext context, string pageName);
    //
    public ViewEngineResult FindPartialView(ActionContext context, string partialViewName);
    //
    public ViewEngineResult FindView(ActionContext context, string viewName);
}

如果你注意到只有一两个属性是虚拟的。我认为可以覆盖构造函数参数之一，以便在调用 FindView() 时可以完成某些操作。我现在不知道，也找不到示例或教程。

Answer 1

是的，您将创建自己的继承自 RazorViewEngine 的 CustomViewEngine。在那里，您将从上下文中读取租户名称，然后指定要查找的路径。

这里是blog post describing creating your own ViewEngine.

更新：您还应该检查 View Location Expander

如何在 MVC 5 中创建多租户视图结构

How do I create a multi-tenant view structure in MVC 5

asp.net-mvc

multi-tenant