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C# - Render MVC Action as string

Veröffentlicht von am 09.03.2011
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This code allows you to render a mvc action as a string. So it can be used in ASP.Net webForms and so on.
Snippet in VB übersetzen
using System;
using System.Collections.Generic;
using System.IO;
using System.Web;
using System.Web.Mvc;
using System.Web.Routing;
using MvcApplication1.Controllers;

namespace MvcApplication1
{
	public partial class WebForm1 : System.Web.UI.Page
	{
		protected void Page_Load(object sender, EventArgs e)
		{
			Response.Write("<pre>" + HttpUtility.HtmlEncode(MVCHelper.RenderAction<HomeController>("Index")) + "</pre>");
		}
	}

	public static class MVCHelper
	{
		public static string RenderAction<TController>(string strActionName, RouteValueDictionary dicRouteValueDictionary = null) where TController : Controller
		{
			return RenderAction(HttpContext.Current, GetControllerName<TController>(), strActionName, dicRouteValueDictionary);
		}

		public static string RenderAction<TController>(HttpContext objHttpContext, string strActionName, RouteValueDictionary dicRouteValueDictionary = null) where TController: Controller
		{
			return RenderAction(objHttpContext, GetControllerName<TController>(), strActionName, dicRouteValueDictionary);
		}

		public static string RenderAction(HttpContext objHttpContext, string strControllerName, string strActionName, RouteValueDictionary dicRouteValueDictionary = null)
		{
			if (dicRouteValueDictionary == null)
				dicRouteValueDictionary = new RouteValueDictionary();

			RouteData objData = new RouteData();
			objData.Values["controller"] = strControllerName;
			objData.Values["action"] = strActionName;

			foreach (KeyValuePair<string, object> objPair in dicRouteValueDictionary)
				objData.Values[objPair.Key] = objPair.Value;
			
			HttpContextBase objContext = new HttpContextWrapper(objHttpContext);
			RequestContext objRequestContext = new RequestContext(objContext, objData);
			IControllerFactory objControllerFactory = ControllerBuilder.Current.GetControllerFactory();
			IController objController = objControllerFactory.CreateController(objRequestContext, strControllerName);
			string strResult = objController.ExecAsString(objRequestContext);
			objControllerFactory.ReleaseController(objController);

			return strResult;
		}

		private static string GetControllerName<TController>() where TController : Controller
		{
			const string POSTFIX = "Controller";
			string strControllerName = typeof (TController).Name;

			return strControllerName.EndsWith(POSTFIX) ? strControllerName.Remove(strControllerName.Length - POSTFIX.Length) : strControllerName;
		}

		private static string ExecAsString(this IController objController, RequestContext objRequestContext)
		{
			using (ResponseStringRedirect objRedirect = new ResponseStringRedirect(objRequestContext.HttpContext.Response))
			{
				objController.Execute(objRequestContext);

				return objRedirect.ToString();
			}
		}

		private class ResponseStringRedirect : IDisposable
		{
			private readonly HttpResponseBase _objResponse;
			private readonly TextWriter _objResponseWriter;
			private StringWriter _objStringWriter;

			public ResponseStringRedirect(HttpResponseBase objResponse)
			{
				_objResponse = objResponse;
				_objResponseWriter = objResponse.Output;
				_objStringWriter = new StringWriter();
				objResponse.Output = _objStringWriter;
			}

			public override string ToString()
			{
				_objStringWriter.Flush();

				return _objStringWriter.ToString();
			}

			public void Dispose()
			{
				if (_objStringWriter == null)
					return;

				_objStringWriter.Dispose();
				_objStringWriter = null;
				_objResponse.Output = _objResponseWriter;
			}
		}
	}
}
Abgelegt unter mvc, action, string.

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