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| using System; | |
| using System.IO; | |
| using System.Threading.Tasks; | |
| 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.ViewFeatures; | |
| using Microsoft.AspNetCore.Routing; | |
| 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) | |
| { | |
| this.razorViewEngine = razorViewEngine; | |
| this.tempDataProvider = tempDataProvider; | |
| this.serviceProvider = serviceProvider; | |
| } | |
| public async Task<string> RenderToStringAsync(string viewName, object model) | |
| { | |
| var httpContext = new DefaultHttpContext { RequestServices = this.serviceProvider }; | |
| var actionContext = new ActionContext(httpContext, new RouteData(), new ActionDescriptor()); | |
| using (var sw = new StringWriter()) | |
| { | |
| var viewResult = this.razorViewEngine.GetView(null, 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, this.tempDataProvider), | |
| sw, | |
| new HtmlHelperOptions()); | |
| await viewResult.View.RenderAsync(viewContext); | |
| return sw.ToString(); | |
| } | |
| } | |
| } |
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