Razor 引擎在 .Net Core 类库中找不到我的视图

Question

我有我的类库，它由ViewRenderService类组成：

public interface IViewRenderService
    {
        Task<string> RenderToStringAsync(string viewName, object model);
    }

    public class ViewRenderService : IViewRenderService
    {
        private readonly IRazorViewEngine _razorViewEngine;
        private readonly ITempDataProvider _tempDataProvider;
        private readonly IServiceProvider _serviceProvider;

        public ViewRenderService(IRazorViewEngine razorViewEngine,
            ITempDataProvider tempDataProvider,
            IServiceProvider serviceProvider)
        {
            _razorViewEngine = razorViewEngine;
            _tempDataProvider = tempDataProvider;
            _serviceProvider = serviceProvider;
        }

        public async Task<string> RenderToStringAsync(string viewName, object model)
        {
            var httpContext = new DefaultHttpContext { RequestServices = _serviceProvider };
            var actionContext = new ActionContext(httpContext, new RouteData(), new ActionDescriptor());

            using (var sw = new StringWriter())
            {
                var viewResult = _razorViewEngine.FindView(actionContext, viewName, false);

                if (viewResult.View == null)
                {
                    throw new ArgumentNullException($"{viewName} does not match any available view");
                }

                var viewDictionary = new ViewDataDictionary(new EmptyModelMetadataProvider(), new ModelStateDictionary())
                {
                    Model = model
                };

                var viewContext = new ViewContext(
                    actionContext,
                    viewResult.View,
                    viewDictionary,
                    new TempDataDictionary(actionContext.HttpContext, _tempDataProvider),
                    sw,
                    new HtmlHelperOptions()
                );

                await viewResult.View.RenderAsync(viewContext);
                return sw.ToString();
            }
        }

和很多视图，从路径开始：我的类库 root/Views//Shared/many views。

问题是，IRazorViewEngine无法找到我的视图，例如，我应该如何调用viewRenderService.RenderToStringAsync(?)render ~/Views/Shared/Myview.cshtml？

Answer 1

我在类库中处理视图的方式是使视图嵌入资源，即在我拥有的 .csproj 文件中

<ItemGroup>
  <EmbeddedResource Include="Views\**" Exclude="bin\**;obj\**;**\*.xproj;packages\**;@(EmbeddedResource)" />
</ItemGroup>

你需要这个包：

<PackageReference Include="Microsoft.Extensions.FileProviders.Embedded" Version="1.1.*" />

然后我的类库中有一个扩展方法，如下所示：

public static RazorViewEngineOptions AddCloudscribeSimpleContentBootstrap3Views(this RazorViewEngineOptions options)
{
    options.FileProviders.Add(new EmbeddedFileProvider(
        typeof(Bootstrap3).GetTypeInfo().Assembly,
        "cloudscribe.SimpleContent.Web.Views.Bootstrap3"
    ));

    return options;
}

然后在主应用程序的 Startup.cs 中，您必须选择使用扩展方法包含这些视图，如下所示：

services.AddMvc()
.AddRazorOptions(options =>
{
    options.AddCloudscribeSimpleContentBootstrap3Views();
});