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之前MVC5和之前的版本中，我们要想对View文件的路径进行控制的话，则必须要对 通过RazorViewEngine来控制View路径 在新版的
public class ThemeViewEngine : RazorViewEngine
{
public ThemeViewEngine(IRazorPageFactory pageFactory,
IRazorViewFactory viewFactory,
IViewLocationExpanderProvider viewLocationExpanderProvider,
IViewLocationCache viewLocationCache)
: base(pageFactory,
viewFactory,
viewLocationExpanderProvider,
viewLocationCache)
{
}
public override IEnumerable<string> AreaViewLocationFormats
{
get
{
var value = new Random().Next(0, 1);
var theme = value == 0 ? "Theme1" : "Theme2"; // 可通过其它条件，设置皮肤的种类
return base.AreaViewLocationFormats.Select(f => f.Replace("/Views/", "/Views/" + theme + "/"));
}
}
public override IEnumerable<string> ViewLocationFormats
{
get
{
var value = new Random().Next(0, 1);
var theme = value == 0 ? "Theme1" : "Theme2"; // 可通过其它条件，设置皮肤的种类
return base.ViewLocationFormats.Select(f => f.Replace("/Views/", "/Views/" + theme + "/"));
}
}
}
然后，通过修改MVcOptions的实例属性ViewEngines即可完成对视图引擎的替换，代码如下：
services.AddMvc().Configure<MvcOptions>(options =>
{
options.ViewEngines.Clear();
options.ViewEngines.Add(typeof(ThemeViewEngine));
});
这样，系统在查找视图文件的时候，就会按照新注册的 通过IViewLocationExpander来控制View路径 在MVC6中，微软还提供了另外一种新的方式来控制View文件的路径，那就是
public class ThemeViewLocationExpander : IViewLocationExpander
{
public void PopulateValues(ViewLocationExpanderContext context)
{
var value = new Random().Next(0, 1);
var theme = value == 0 ? "Theme1" : "Theme2";
context.Values["theme"] = theme;
}
public virtual IEnumerable<string> ExpandViewLocations(ViewLocationExpanderContext context,
IEnumerable<string> viewLocations)
{
return viewLocations.Select(f => f.Replace("/Views/", "/Views/" + context.Values["theme"] + "/"));
}
}
在上述自定义的 最后，我们在
services.Configure<RazorViewEngineOptions>(options =>
{
options.ViewLocationExpanders.Add(typeof(ThemViewLocationExpander));
});
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