/// <summary>
/// Renders an embedded razor view.
/// </summary>
/// <param name="requesterType"> </param>
/// <param name="viewName"></param>
/// <param name="viewData"></param>
/// <returns></returns>
public static string RenderEmbeddedRazor(Type requesterType, [JetBrains.Annotations.AspMvcView] string viewName, ViewDataDictionary viewData)
{
// TODO: support layout page
// TODO: support _ViewStart pages
// Creating or getting the type that renders the view.
var resourcePath = string.Format(
"{0}\\Views\\{1}\\{2}.cshtml",
Path.GetFileNameWithoutExtension(requesterType.Assembly.GetName().Name),
requesterType.Name,
viewName);
var key = new RequesterTypeAndResourcePath
{
RequesterType = requesterType,
ResourcePath = resourcePath,
};
var type = pageTypeByResourcePath.GetOrAdd(key, CreateTypeForEmbeddedRazor);
if (type == null)
{
throw new Exception("View not found.");
}
// Rendering the page, using the passed model.
var page = (WebViewPage)Activator.CreateInstance(type);
using (var stringWriter = new StringWriter())
{
// We need to emulate the environment of a web-request to render the view.
var httpContext = new MvcHelper.MockHttpContext {
Request2 = new MvcHelper.MockHttpRequest()
};
var requestContext = new RequestContext(httpContext, new RouteData());
page.ViewContext = new ViewContext(
new ControllerContext(requestContext, new HomeController()),
new RazorView(new ControllerContext(), resourcePath, null, true, new[] { "cshtml", "vbhtml" }),
viewData,
new TempDataDictionary(),
stringWriter);
page.ViewData = viewData;
page.Url = new UrlHelper(requestContext, RouteTable.Routes);
page.PushContext(new WebPageContext(httpContext, null, viewData), stringWriter);
try
{
// Executing the renderer, so that it writes to the stringWriter.
page.Execute();
// after executing the page, we need to copy value from the cloned ViewData
// to the original ViewData... so that the caller can see elements inserted
// or changed by the view
foreach (var eachViewDataItem in page.ViewData)
{
viewData[eachViewDataItem.Key] = eachViewDataItem.Value;
}
}
finally
{
page.PopContext();
}
// The rendered page is inside the stringWriter.
var result = stringWriter.GetStringBuilder().ToString();
return(result);
}
}
/// <summary>
/// Renders an embedded razor view.
/// </summary>
/// <param name="requesterType"> </param>
/// <param name="viewName"></param>
/// <param name="viewData"></param>
/// <returns></returns>
public static string RenderEmbeddedRazor(Type requesterType, [JetBrains.Annotations.AspMvcView] string viewName, ViewDataDictionary viewData)
{
// TODO: support layout page
// TODO: support _ViewStart pages
// Creating or getting the type that renders the view.
var resourcePath = string.Format(
"{0}\\Views\\{1}\\{2}.cshtml",
Path.GetFileNameWithoutExtension(requesterType.Assembly.GetName().Name),
requesterType.Name,
viewName);
var key = new RequesterTypeAndResourcePath
{
RequesterType = requesterType,
ResourcePath = resourcePath,
};
var type = pageTypeByResourcePath.GetOrAdd(key, CreateTypeForEmbeddedRazor);
if (type == null)
throw new Exception("View not found.");
// Rendering the page, using the passed model.
var page = (WebViewPage)Activator.CreateInstance(type);
using (var stringWriter = new StringWriter())
{
// We need to emulate the environment of a web-request to render the view.
var httpContext = new MvcHelper.MockHttpContext { Request2 = new MvcHelper.MockHttpRequest() };
var requestContext = new RequestContext(httpContext, new RouteData());
page.ViewContext = new ViewContext(
new ControllerContext(requestContext, new HomeController()),
new RazorView(new ControllerContext(), resourcePath, null, true, new[] { "cshtml", "vbhtml" }),
viewData,
new TempDataDictionary(),
stringWriter);
page.ViewData = viewData;
page.Url = new UrlHelper(requestContext, RouteTable.Routes);
page.PushContext(new WebPageContext(httpContext, null, viewData), stringWriter);
try
{
// Executing the renderer, so that it writes to the stringWriter.
page.Execute();
// after executing the page, we need to copy value from the cloned ViewData
// to the original ViewData... so that the caller can see elements inserted
// or changed by the view
foreach (var eachViewDataItem in page.ViewData)
viewData[eachViewDataItem.Key] = eachViewDataItem.Value;
}
finally
{
page.PopContext();
}
// The rendered page is inside the stringWriter.
var result = stringWriter.GetStringBuilder().ToString();
return result;
}
}
private static Type CreateTypeForEmbeddedRazor(RequesterTypeAndResourcePath data)
{
// Getting razor code from resource.
string code = null;
string resourceName = data.ResourcePath.Replace('\\', '.');
using (var stream = data.RequesterType.Assembly.GetManifestResourceStream(resourceName))
if (stream != null)
{
using (var reader = new StreamReader(stream))
code = reader.ReadToEnd();
}
if (code == null)
{
throw new Exception("Resource was not found. Maybe it has not been embedded.");
}
var virtualPath = string.Format("~/{0}", data.ResourcePath.Replace('\\', '/'));
var className = resourceName.Replace('.', '_');
// Creating compile unit, using Mvc Razor syntax.
// These settings must match those of 'web.config' file, section 'system.web.webPages.razor'
var factory = new MvcWebRazorHostFactory();
var host = factory.CreateHost(virtualPath, data.ResourcePath);
host.DefaultPageBaseClass = typeof(CerebelloViewPage).FullName;
host.NamespaceImports.Add("System.Web.Mvc");
host.NamespaceImports.Add("System.Web.Mvc.Ajax");
host.NamespaceImports.Add("System.Web.Mvc.Html");
host.NamespaceImports.Add("System.Web.Routing");
host.NamespaceImports.Add("CerebelloWebRole.Code");
host.NamespaceImports.Add("CerebelloWebRole.Models");
var engine = new RazorTemplateEngine(host);
GeneratorResults results;
using (TextReader reader = new StringReader(code))
results = engine.GenerateCode(reader, className, rootNamespace: null, sourceFileName: host.PhysicalPath);
if (!results.Success)
{
throw CreateExceptionFromParserError(results.ParserErrors.Last(), virtualPath);
}
// Compiling an assembly with the code.
var codeProvider = new CSharpCodeProvider();
var compilerParams = new CompilerParameters
{
GenerateInMemory = true,
GenerateExecutable = false,
#if DEBUG
IncludeDebugInformation = true,
#endif
};
// loading a required assembly, before creating the list of 'ReferencedAssemblies'
// reference: http://razorengine.codeplex.com/discussions/242605
if (typeof(Microsoft.CSharp.RuntimeBinder.Binder).Assembly == null)
{
throw new Exception("Could not load required assembly.");
}
compilerParams.ReferencedAssemblies.AddRange(
AppDomain.CurrentDomain
.GetAssemblies()
.Where(a => !a.IsDynamic)
.GroupBy(a => a.FullName)
.Select(grp => grp.First())
.Select(a => a.Location)
.ToArray());
var compilerResult = codeProvider.CompileAssemblyFromDom(compilerParams, results.GeneratedCode);
// Returning the compiled type.
var type = compilerResult.CompiledAssembly.GetTypes().Single(t => t.Name == className);
return(type);
}
private static Type CreateTypeForEmbeddedRazor(RequesterTypeAndResourcePath data)
{
// Getting razor code from resource.
string code = null;
string resourceName = data.ResourcePath.Replace('\\', '.');
using (var stream = data.RequesterType.Assembly.GetManifestResourceStream(resourceName))
if (stream != null)
using (var reader = new StreamReader(stream))
code = reader.ReadToEnd();
if (code == null)
throw new Exception("Resource was not found. Maybe it has not been embedded.");
var virtualPath = string.Format("~/{0}", data.ResourcePath.Replace('\\', '/'));
var className = resourceName.Replace('.', '_');
// Creating compile unit, using Mvc Razor syntax.
// These settings must match those of 'web.config' file, section 'system.web.webPages.razor'
var factory = new MvcWebRazorHostFactory();
var host = factory.CreateHost(virtualPath, data.ResourcePath);
host.DefaultPageBaseClass = typeof(CerebelloViewPage).FullName;
host.NamespaceImports.Add("System.Web.Mvc");
host.NamespaceImports.Add("System.Web.Mvc.Ajax");
host.NamespaceImports.Add("System.Web.Mvc.Html");
host.NamespaceImports.Add("System.Web.Routing");
host.NamespaceImports.Add("CerebelloWebRole.Code");
host.NamespaceImports.Add("CerebelloWebRole.Models");
var engine = new RazorTemplateEngine(host);
GeneratorResults results;
using (TextReader reader = new StringReader(code))
results = engine.GenerateCode(reader, className, rootNamespace: null, sourceFileName: host.PhysicalPath);
if (!results.Success)
throw CreateExceptionFromParserError(results.ParserErrors.Last(), virtualPath);
// Compiling an assembly with the code.
var codeProvider = new CSharpCodeProvider();
var compilerParams = new CompilerParameters
{
GenerateInMemory = true,
GenerateExecutable = false,
#if DEBUG
IncludeDebugInformation = true,
#endif
};
// loading a required assembly, before creating the list of 'ReferencedAssemblies'
// reference: http://razorengine.codeplex.com/discussions/242605
if (typeof(Microsoft.CSharp.RuntimeBinder.Binder).Assembly == null)
throw new Exception("Could not load required assembly.");
compilerParams.ReferencedAssemblies.AddRange(
AppDomain.CurrentDomain
.GetAssemblies()
.Where(a => !a.IsDynamic)
.GroupBy(a => a.FullName)
.Select(grp => grp.First())
.Select(a => a.Location)
.ToArray());
var compilerResult = codeProvider.CompileAssemblyFromDom(compilerParams, results.GeneratedCode);
// Returning the compiled type.
var type = compilerResult.CompiledAssembly.GetTypes().Single(t => t.Name == className);
return type;
}
