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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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