Question

我在MVC之外使用Razor。我想将视图呈现为字符串。这是我的方法：

    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 = _viewEngine.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();
        }
    }

我创建了Views文件夹并粘贴了几个视图。所有文件都有复制到输出目录 - 始终复制。但我接下来要到这里了

  var viewResult = _viewEngine.FindView(actionContext, viewName, false);

viewResult具有属性Success，该属性始终为false，并且还具有值为“/Views/Shared/Email.cshtml”和“/Views//Email.cshtml”的属性SearchedLocations。有什么想法吗？

Answer 1

默认视图位置为/Views/{1}/{0}.cshtml和/Views/Shared/{0}.cshtml

可能控制器不存在（并且razor找不到控制器），所以在你的情况下它是/Views//Email.cshtml。

您可以通过添加新的视图位置扩展器来添加自定义位置：

public class ViewLocationExpander : IViewLocationExpander
{
    public IEnumerable<string> ExpandViewLocations(ViewLocationExpanderContext context, IEnumerable<string> viewLocations)
    {
        var locationWithoutController = "/Views/{0}.cshtml";
        return viewLocations.Union(new[] { locationWithoutController });
    }

    public void PopulateValues(ViewLocationExpanderContext context)
    {
    }
}

在Startup.cs中注册扩展器：

public void ConfigureServices(IServiceCollection services)
    {
        services.AddMvc()
        .AddRazorOptions(options =>
        {
            options.ViewLocationExpanders.Add(new ViewLocationExpander());
        });
    }

无法找到Razor .Net Core应用程序

1 个答案: