如何解决如何以纯字符串形式查看文件内容
ASP.NET Core 5 MVC 应用程序使用来自 https://github.com/adoconnection/RazorEngineCore 的 razor 引擎在运行时将视图呈现为字符串。
如何以字符串形式获取视图 ~/Views/Checkout/Order.cshtml
内容?
我试过了
ReadTemplate("~/Views/Checkout/Order.cshtml")
但它会引发错误。应用程序可以部署为单个文件或单独的文件。
string ReadTemplate(string filename)
{
var stream = GetType().Assembly.GetManifestResourceStream(filename);
if (stream == null)
throw new ApplicationException(filename + " view not found");
StreamReader reader = new(stream);
string template = reader.ReadToEnd();
reader.Close();
return template;
}
解决方法
如何以字符串形式获取视图 ~/Views/Checkout/Order.cshtml 内容?
您可以尝试使用以下代码创建一个 ViewRenderService:
public interface IViewRenderService
{
Task<string> RenderToString(string viewName,object model);
}
public class ViewRenderService : IViewRenderService
{
private readonly IRazorViewEngine _razorViewEngine;
private readonly ITempDataProvider _tempDataProvider;
private readonly IHttpContextAccessor _contextAccessor;
public ViewRenderService(IRazorViewEngine razorViewEngine,ITempDataProvider tempDataProvider,IHttpContextAccessor contextAccessor)
{
_razorViewEngine = razorViewEngine;
_tempDataProvider = tempDataProvider;
_contextAccessor = contextAccessor;
}
public async Task<string> RenderToString(string viewName,object model)
{
var actionContext = new ActionContext(_contextAccessor.HttpContext,_contextAccessor.HttpContext.GetRouteData(),new ActionDescriptor());
await using var sw = new StringWriter();
var viewResult = FindView(actionContext,viewName);
if (viewResult == 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,viewDictionary,new TempDataDictionary(actionContext.HttpContext,_tempDataProvider),sw,new HtmlHelperOptions()
);
await viewResult.RenderAsync(viewContext);
return sw.ToString();
}
private IView FindView(ActionContext actionContext,string viewName)
{
var getViewResult = _razorViewEngine.GetView(executingFilePath: null,viewPath: viewName,isMainPage: true);
if (getViewResult.Success)
{
return getViewResult.View;
}
var findViewResult = _razorViewEngine.FindView(actionContext,viewName,isMainPage: true);
if (findViewResult.Success)
{
return findViewResult.View;
}
var searchedLocations = getViewResult.SearchedLocations.Concat(findViewResult.SearchedLocations);
var errorMessage = string.Join(
Environment.NewLine,new[] { $"Unable to find view '{viewName}'. The following locations were searched:" }.Concat(searchedLocations));
throw new InvalidOperationException(errorMessage);
}
}
在上述服务中添加以下引用:
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Abstractions;
using Microsoft.AspNetCore.Mvc.ModelBinding;
using Microsoft.AspNetCore.Mvc.Razor;
using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.AspNetCore.Mvc.ViewEngines;
using Microsoft.AspNetCore.Mvc.ViewFeatures;
using Microsoft.AspNetCore.Routing;
然后,在Startup.ConfigureServices方法中注册ViewRenderService:
services.AddScoped<IViewRenderService,ViewRenderService>();
之后,您可以使用此服务将视图页面呈现为字符串:
public class HomeController : Controller
{
private readonly IViewRenderService _viewRenderService;
public HomeController(IViewRenderService viewRenderService)
{
_viewRenderService = viewRenderService;
}
public async Task<IActionResult> CategoryIndex()
{
//The model will be transferred to the View page.
var stulist = new List<Student>() { new Student() { StudentName = "AA" },new Student() { StudentName = "BB" } };
var result = _viewRenderService.RenderToString("Views/Student/Index.cshtml",stulist).Result;
return View();
}
结果如下:
,在您的评论回复中,您写道:
如何强制将视图作为程序集资源包含在内?它仅被应用程序用作要呈现的字符串内容。它不是常规视图,不用于创建 html 页面。将构建操作设置为嵌入式资源是否足够。应该使用哪个路径来获取此资源?
您可以自己infer the resource stream name,也可以通过直接编辑您的.csproj
文件来指定<LogicalName>
来you can manually specify a name(我不知道为什么这个元素没有公开在“属性”窗口中,确实应该如此)。后一个选项更好,因为在移动文件时名称将保持不变)。
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