I have the following set of classes that I used to dynamically load in a View. The code below works well when called with .RenderPartial.
public class VirtFile:VirtualFile
{
public VirtFile(string virtualPath) : base(virtualPath)
{
}
public override Stream Open()
{
string path = this.VirtualPath;
Stream str = new MemoryStream();
StreamWriter writer = new StreamWriter(str);
writer.Write(#"<%# Control Language=""C#"" Inherits=""System.Web.Mvc.ViewUserControl"" %>
<%="Test"%>
");
writer.Flush();
str.Position = 0;
return str;
}
}
public class Provider:VirtualPathProvider
{
public override System.Web.Caching.CacheDependency GetCacheDependency(string virtualPath, System.Collections.IEnumerable virtualPathDependencies, DateTime utcStart)
{
return null;
var dependency = new System.Web.Caching.CacheDependency(virtualPath);
return dependency;// base.GetCacheDependency(virtualPath, virtualPathDependencies, utcStart);
}
public override bool DirectoryExists(string virtualDir)
{
if (IsVirtual(virtualDir))
{
return true;
}
return base.DirectoryExists(virtualDir);
}
public override bool FileExists(string virtualPath)
{
if (IsVirtual(virtualPath))
{
return true;
}
return base.FileExists(virtualPath);
}
public override VirtualFile GetFile(string virtualPath)
{
if(IsVirtual(virtualPath))
{
return new VirtFile(virtualPath);
}
return base.GetFile(virtualPath);
}
private bool IsVirtual(string virtualPath)
{
return virtualPath.Contains("Database");
}
But if I try to change the <%="Test"%> to <%=new Model.Category()%>, of create a typed View I get an error stating that "The type or namespace name 'Model' could not be found (are you missing a using directive or an assembly reference?)". However, the same code works if it is simply placed in an .ascx file.
Am I missing something, it seems like wether the stream comes from the file system or a custom VirtualPathProvider it should have the same loaded assemblies, since <%=AppDomain.CurrentDomain.ApplicationIdentity%> returns the same value from either the file system or the custom provider.
Try adding
<%# Import Namespace="MyApp.Model" %>
to your dynamic user control string.
EDIT:
Of course, you could also use the fully qualified name for the type, changing Model.Category() to MyApp.Model.Category(). Most of the time, I import the namespace. Just a style preference.
How your Model class look like? Is it wrapped within some namespace? VPP is pretty amazing thing and can do a lot of magic, just make sure when you passing 'string' with your virtual asp.net 'page' content you provide full path to you classes, it's safer this way. or, another option, use your web.config to link your namespaces, so app will find your classes.
Related
Is it possible to pass into the ModelBinder which implementation you want to use inline?
Given the following definitions:
public interface ISomeInterface
{
string MyString{get;set;}
}
public class SomeInterfaceImplementation_One : ISomeInterface
{
private string _MyString;
public string MyString
{
get {return "This is implementation One " + _MyString ; }
set { _MyString = value; }
}
}
public class SomeInterfaceImplementation_Two : ISomeInterface
{
private string _MyString;
public string MyString
{
get {return "This is implementation Two" + _MyString ; }
set { _MyString = value; }
}
}
Given this route in asp.net mvc core:
public ActionResult InterfaceWithInlineImplementation([ModelBinder(typeof(SomeBinder))]ISomeInterface SomeInterface)
{
//Return actionresult
}
I do not want a different ModelBinder class for each implementation rather I would like each route to specify which implementation inline.
So something like:
[UseImplementation(SomeInterfaceImplementation_One)]
public ActionResult InterfaceWithInlineImplementation([ModelBinder(typeof(SomeBinder))]ISomeInterface SomeInterface)
{
}
Or:
public ActionResult InterfaceWithInlineImplementation([ModelBinder(typeof(SomeBinder), ConcreteType = SomeInterfaceImplementation_Two )]ISomeInterface SomeInterface)
{
}
This way the SomeBinder class can access which implementation is being requested in the BindModelAsync method of SomeBinder : IModelBinder class.
public class SomeBinder : Microsoft.AspNetCore.Mvc.ModelBinding.IModelBinder
{
public Task BindModelAsync(Microsoft.AspNetCore.Mvc.ModelBinding.ModelBindingContext bindingContext)
{
if (bindingContext == null)
throw new ArgumentNullException(nameof(bindingContext));
string valueFromBody = string.Empty;
using (var sr = new StreamReader(bindingContext.HttpContext.Request.Body))
{
valueFromBody = sr.ReadToEnd();
}
if (string.IsNullOrEmpty(valueFromBody))
{
return Task.CompletedTask;
}
var settings = new JsonSerializerSettings()
{
ContractResolver = new InterfaceContractResolver(), // Need requested implementation from InterfaceWithInlineImplementation() method
};
var obj = JsonConvert.DeserializeObject(valueFromBody, [**Need Requested Implementation from Method**], settings);
bindingContext.Model = obj;
bindingContext.Result = ModelBindingResult.Success(obj);
return Task.CompletedTask;
}
Use generics.
public class SomeBinder<TConcreteType> : IModelBinder
{
}
Then your signature becomes
public ActionResult InterfaceWithInlineImplementation(
[ModelBinder(typeof(SomeBinder<SomeInterfaceImpelemtation_One>))]ISomeInterface SomeInterface)
Then deserialization is:
JsonConvert.DeserializeObject<TConcreteType>(json)
However based on your last comment it sounds like you just need to Prevent overposting instead of this convoluted model binding.
So lets say the client knows that the server implementation has security methods and tries to match the signature hoping everything get deseriazled for example. Its being explicit as to what you're expecting. And you're explicitly expecting only the contract definition and nothing more.
Excerpt:
Mass assignment typically occurs during model binding as part of MVC. A simple example would be where you have a form on your website in which you are editing some data. You also have some properties on your model which are not editable as part of the form, but instead are used to control the display of the form, or may not be used at all.
public class UserModel
{
public string Name { get; set; }
public bool IsAdmin { get; set; }
}
So the idea here is that you only render a single input tag to the markup, but you post this to a method that uses the same model as you used for rendering:
[HttpPost]
public IActionResult Vulnerable(UserModel model)
{
return View("Index", model);
}
However, with a simple bit of HTML manipulation, or by using Postman/Fiddler , a malicious user can set the IsAdmin field to true. The model binder will dutifully bind the value, and you have just fallen victim to mass assignment/over posting:
So how can you prevent this attack? Luckily there's a whole host of different ways, and they are generally the same as the approaches you could use in the previous version of ASP.NET. I'll run through a number of your options here.
Continue to article...
Surprised I'm not finding this answer anywhere, how can I determine what Controller/Action will be invoked for a given URL in MVC 3?
Update
What I really want to know:
"how can I determine what ControllerAction will be invoked for a given URL in MVC 3?" ....yeah
So, either I'm not aware of the magic method that does this:
ControllerActionInfo GetControllerActionInfo(string url)
Or, I will have to create it myself doing whatever MVC does when it gets an http request.
My purpose of asking about this on StackOverflow is that I can save some time reverse engineering this behavior. The correct answer should resemble:
Here's how you can do it: and some code would follow.
You have to use a dummy HttpContext and HttpRequest classes as follows:
public class DummyHttpRequest : HttpRequestBase {
private string mUrl;
public DummyHttpRequest(string url) {
mUrl = url;
}
public override string AppRelativeCurrentExecutionFilePath {
get {
return mUrl;
}
}
public override string PathInfo {
get {
return string.Empty;
}
}
}
public class DummyHttpContext : HttpContextBase {
private string mUrl;
public DummyHttpContext(string url) {
mUrl = url;
}
public override HttpRequestBase Request {
get {
return new DummyHttpRequest(mUrl);
}
}
}
Edit: Also, you can extend the DefaultControllerFactory and add a simple method to get the desired information instead of an instance of Controller. (Note: It's merely a sample, you have to support other aspects like ActionNameAttribute and so on)
public class ControllerActionInfo {
public ControllerActionInfo(Type controllerType, MethodInfo action) {
ControllerType = controllerType;
Action = action;
}
public Type ControllerType { get; private set; }
public MethodInfo Action { get; private set; }
}
public class DefaultControllerFactoryEx : DefaultControllerFactory {
public ControllerActionInfo GetInfo(RequestContext requestContext, string controllerName) {
Type controllerType = GetControllerType(requestContext, controllerName);
if (controllerType == null) {
return null;
}
MethodInfo actionMethod = controllerType.GetMethod(requestContext.RouteData.GetRequiredString("action"), BindingFlags.IgnoreCase | BindingFlags.Instance | BindingFlags.Public);
return new ControllerActionInfo(controllerType, actionMethod);
}
}
Then, use following code snippet to get access to the controller:
DummyHttpContext httpContext = new DummyHttpContext("~/home/index");
RouteData routeData = RouteTable.Routes.GetRouteData(httpContext);
// IController controller = new DefaultControllerFactory().CreateController(new RequestContext(httpContext, routeData), routeData.GetRequiredString("controller"));
DefaultControllerFactoryEx controllerFactory = new DefaultControllerFactoryEx();
var result = controllerFactory.GetInfo(new RequestContext(httpContext, routeData), routeData.GetRequiredString("controller"));
The logic for this is in the System.Web.Mvc.MvcHandler class, the System.Web.Mvc.DefaultControllerFactory class, and the System.Web.Mvc.ControllerActionInvoker class. .NET Reflector is your friend.
Basically, the MVC framework:
Uses reflection to get all the controllers in the application project.
Then it does something like IEnumerable<string> controllerNames = controllerTypes.Select(controllerType => controllerType.Name.Replace("Controller",string.Empty));. It then tries to match the first path segment, {controller}, to one of these sanitized controller type names (case-insensitive).
Then, it looks at this controller's public methods that have a return type that is of type ActionResult or some derivative. It matches the method name to the second path segment, {action}, as the action method to be called.
If the selected method has a parameter that is named id, then it matches the third path segment {id} to that value, and passes it to the method. Otherwise, the optional id parameter is ignored.
If the ActionResult type that is returned is a derivative of ViewResultBase then the IViewEngine tries to locate a corresponding view in the project using whatever conventions have been specified for that view engine. The WebFormViewEngine, for example, looks in the project for ~/Views/{controller}/{action}.ascx, ~/Views/{controller}/{action}.aspx, ~/Views/Shared/{action}.ascx, ~/Views/Shared/{action}.aspx by default.
If you want to further understand how routing works in MVC, I would highly suggest Scott Gu's article on MVC Routing.
We are developing a web application with ASP.Net 4 & MVC 3 Framework. I've installed T4MVC through NuGet and all the Views, Controllers and static content are succesfully generated as strong types.
But, when I try to compile the project, it raises an error at generated file T4MVC.cs, which is:
'T4MVC_ViewResultBase.FindView(System.Web.Mvc.ControllerContext)':
return type must be 'System.Web.Mvc.ViewEngineResult' to match overridden member
'System.Web.Mvc.ViewResultBase.FindView(System.Web.Mvc.ControllerContext)'
This is the source code generated:
[GeneratedCode("T4MVC", "2.0"), DebuggerNonUserCode]
public class T4MVC_ViewResultBase : System.Web.Mvc.ViewResultBase,
IT4MVCActionResult
{
public T4MVC_ViewResultBase(string area, string controller, string action):
base() {
this.InitMVCT4Result(area, controller, action);
}
protected override void FindView(System.Web.Mvc.ControllerContext context){}
public string Controller { get; set; }
public string Action { get; set; }
public RouteValueDictionary RouteValueDictionary { get; set; }
}
The error says that:
protected override void FindView(System.Web.Mvc.ControllerContext context) { }
should be:
protected override ViewEngineResult
FindView(System.Web.Mvc.ControllerContext context) { }
But then it raises another compiling error, as this method should return code.
If we check the base class it inherits from, System.Web.Mvc.ViewResultBase, it actually declares FindView() with ViewEngineResult return type:
public abstract class ViewResultBase : ActionResult
{
...
protected abstract ViewEngineResult FindView(ControllerContext context);
}
Has anyone got this error? Has it something to do with MVC version, are we are using MVC 3?
Thanks a lot!
Sergi
I think I see the problem, and it is a T4MVC bug. But hopefully it's easy to work around.
Do you have a controller action that is declared to return a ViewResultBase? If so, can you change the return type to be ActionResult? Or alternatively you can change the return type to be whatever the concrete type is that you're returning (e.g. is it ViewResult)?
The T4MVC bug is that it doesn't correctly override non-void methods in ActionResult types.
ScottGu mentioned that we should be able to load a Razor view from a database (check the comments section), so does anybody have an example on how to do that?
Thanks.
You might want to check Pulling a View from a database rather than a file or Using VirtualPathProvider to load ASP.NET MVC views from DLLs
Taking the code from my previous question on the subject.
In your FileExists() method on the other page you replace the test code I have there with some db code that actually checks to see if the virtualPath has an entry in your database. Your database would look something like:
Views --tablename
Path --view's virtual path
SomeOtherValue
...and your call would then be something like
public class DbPathProvider : VirtualPathProvider {
public DbPathProvider() : base() {
}
public override bool FileExists(string virtualPath) {
Database db = new Database();
return db.Views.Any(w => w.Path == virtualPath);
}
public override VirtualFile GetFile(string virtualPath) {
return new DbVirtualFile(virtualPath);
}
}
And now we modify the DbVirtualFile
public class DbVirtualFile : System.Web.Hosting.VirtualFile {
public DbVirtualFile(string path) : base (path) {
}
public override System.IO.Stream Open() {
Database db = new Database();
return new System.IO.MemoryStream(
db.Views.Single(v => v.Path == this.VirtualPath));
}
}
The virtualPath doesn't have to correspond to a real filesystem if you don't want it to. You can override the functionality by implementing these two classes.
You can then register your new VirtualPathProvider in the global.asax like so
HostingEnvironment.RegisterVirtualPathProvider(new DbPathProvider());
I hope this better answers your question.
Setup:
CustomViewEngine
CustomController Base
CustomViewPage Base (in this base, a new property is added "MyCustomProperty")
Problem:
When a view is strongly typed such as: <# Page Inherits="CustomViewPage<MyCustomObject" MyCustomProperty="Hello">, I get a compiler "Parser" error stating that MyCustomProperty is not a public property of System.Web.Mvc.ViewPage
I have done numerous trial and errors (see below) to see whats causing this error and have come to the following conclusions:
The error only occurs when I declare "MyCustomProperty" or any other property in the #Page directive of the view.
The error will always display "System.Web.Mvc.ViewPage" rather than the declared inherits=".." class.
Update: Looks like Technitium found another way to do this that looks much easier, at least on newer versions of ASP.NET MVC. (copied his comment below)
I'm not sure if this is new in ASP.NET MVC 3, but when I swapped the
Inherits attribute from referencing the generic in C# syntax to CLR
syntax, the standard ViewPageParserFilter parsed generics correctly --
no CustomViewTypeParserFilter required. Using Justin's examples, this
means swapping
<%# Page Language="C#" MyNewProperty="From #Page directive!"
Inherits="JG.ParserFilter.CustomViewPage<MvcApplication1.Models.FooModel>
to
<%# Page Language="C#" MyNewProperty="From #Page directive!"`
Inherits="JG.ParserFilter.CustomViewPage`1[MvcApplication1.Models.FooModel]>
Original answer below:
OK, I solved this. Was a fascinating exercise, and the solution is non-trivial but not too hard once you get it working the first time.
Here's the underlying issue: the ASP.NET page parser does not support generics as a page type.
The way ASP.NET MVC worked around this was by fooling the underlying page parser into thinking that the page is not generic. They did this by building a custom PageParserFilter and a custom FileLevelPageControlBuilder. The parser filter looks for a generic type, and if it finds one, swaps it out for the non-generic ViewPage type so that the ASP.NET parser doesn't choke. Then, much later in the page compilation lifecycle, their custom page builder class swaps the generic type back in.
This works because the generic ViewPage type derives from the non-generic ViewPage, and all the interesting properties that are set in a #Page directive exist on the (non-generic) base class. So what's really happening when properties are set in the #Page directive is that those property names are being validated against the non-generic ViewPage base class.
Anyway, this works great in most cases, but not in yours because they hardcode ViewPage as the non-generic base type in their page filter implementation and don't provide an easy way to change it. This is why you kept seeing ViewPage in your error message, since the error happens in between when ASP.NET swaps in the ViewPage placeholder and when it swaps back the generic ViewPage right before compilation.
The fix is to create your own version of the following:
page parser filter - this is almost an exact copy of ViewTypeParserFilter.cs in the MVC source, with the only difference being that it refers to your custom ViewPage and page builder types instead of MVC's
page builder - this is identical to ViewPageControlBuilder.cs in the MVC source, but it puts the class in your own namespace as opposed to theirs.
Derive your custom viewpage class directly from System.Web.Mvc.ViewPage (the non-generic version). Stick any custom properties on this new non-generic class.
derive a generic class from #3, copying the code from the ASP.NET MVC source's implementation of ViewPage.
repeat #2, #3, and #4 for user controls (#Control) if you also need custom properties on user control directives too.
Then you need to change the web.config in your views directory (not the main app's web.config) to use these new types instead of MVC's default ones.
I've enclosed some code samples illustrating how this works. Many thanks to Phil Haack's article to help me understand this, although I had to do a lot of poking around the MVC and ASP.NET source code too to really understand it.
First, I'll start with the web.config changes needed in your web.config:
<pages
validateRequest="false"
pageParserFilterType="JG.ParserFilter.CustomViewTypeParserFilter"
pageBaseType="JG.ParserFilter.CustomViewPage"
userControlBaseType="JG.ParserFilter.CustomViewUserControl">
Now, here's the page parser filter (#1 above):
namespace JG.ParserFilter {
using System;
using System.Collections;
using System.Web.UI;
using System.Web.Mvc;
internal class CustomViewTypeParserFilter : PageParserFilter
{
private string _viewBaseType;
private DirectiveType _directiveType = DirectiveType.Unknown;
private bool _viewTypeControlAdded;
public override void PreprocessDirective(string directiveName, IDictionary attributes) {
base.PreprocessDirective(directiveName, attributes);
string defaultBaseType = null;
// If we recognize the directive, keep track of what it was. If we don't recognize
// the directive then just stop.
switch (directiveName) {
case "page":
_directiveType = DirectiveType.Page;
defaultBaseType = typeof(JG.ParserFilter.CustomViewPage).FullName; // JG: inject custom types here
break;
case "control":
_directiveType = DirectiveType.UserControl;
defaultBaseType = typeof(JG.ParserFilter.CustomViewUserControl).FullName; // JG: inject custom types here
break;
case "master":
_directiveType = DirectiveType.Master;
defaultBaseType = typeof(System.Web.Mvc.ViewMasterPage).FullName;
break;
}
if (_directiveType == DirectiveType.Unknown) {
// If we're processing an unknown directive (e.g. a register directive), stop processing
return;
}
// Look for an inherit attribute
string inherits = (string)attributes["inherits"];
if (!String.IsNullOrEmpty(inherits)) {
// If it doesn't look like a generic type, don't do anything special,
// and let the parser do its normal processing
if (IsGenericTypeString(inherits)) {
// Remove the inherits attribute so the parser doesn't blow up
attributes["inherits"] = defaultBaseType;
// Remember the full type string so we can later give it to the ControlBuilder
_viewBaseType = inherits;
}
}
}
private static bool IsGenericTypeString(string typeName) {
// Detect C# and VB generic syntax
// REVIEW: what about other languages?
return typeName.IndexOfAny(new char[] { '<', '(' }) >= 0;
}
public override void ParseComplete(ControlBuilder rootBuilder) {
base.ParseComplete(rootBuilder);
// If it's our page ControlBuilder, give it the base type string
CustomViewPageControlBuilder pageBuilder = rootBuilder as JG.ParserFilter.CustomViewPageControlBuilder; // JG: inject custom types here
if (pageBuilder != null) {
pageBuilder.PageBaseType = _viewBaseType;
}
CustomViewUserControlControlBuilder userControlBuilder = rootBuilder as JG.ParserFilter.CustomViewUserControlControlBuilder; // JG: inject custom types here
if (userControlBuilder != null) {
userControlBuilder.UserControlBaseType = _viewBaseType;
}
}
public override bool ProcessCodeConstruct(CodeConstructType codeType, string code) {
if (codeType == CodeConstructType.ExpressionSnippet &&
!_viewTypeControlAdded &&
_viewBaseType != null &&
_directiveType == DirectiveType.Master) {
// If we're dealing with a master page that needs to have its base type set, do it here.
// It's done by adding the ViewType control, which has a builder that sets the base type.
// The code currently assumes that the file in question contains a code snippet, since
// that's the item we key off of in order to know when to add the ViewType control.
Hashtable attribs = new Hashtable();
attribs["typename"] = _viewBaseType;
AddControl(typeof(System.Web.Mvc.ViewType), attribs);
_viewTypeControlAdded = true;
}
return base.ProcessCodeConstruct(codeType, code);
}
// Everything else in this class is unrelated to our 'inherits' handling.
// Since PageParserFilter blocks everything by default, we need to unblock it
public override bool AllowCode {
get {
return true;
}
}
public override bool AllowBaseType(Type baseType) {
return true;
}
public override bool AllowControl(Type controlType, ControlBuilder builder) {
return true;
}
public override bool AllowVirtualReference(string referenceVirtualPath, VirtualReferenceType referenceType) {
return true;
}
public override bool AllowServerSideInclude(string includeVirtualPath) {
return true;
}
public override int NumberOfControlsAllowed {
get {
return -1;
}
}
public override int NumberOfDirectDependenciesAllowed {
get {
return -1;
}
}
public override int TotalNumberOfDependenciesAllowed {
get {
return -1;
}
}
private enum DirectiveType {
Unknown,
Page,
UserControl,
Master,
}
}
}
Here's the page builder class (#2 above):
namespace JG.ParserFilter {
using System.CodeDom;
using System.Web.UI;
internal sealed class CustomViewPageControlBuilder : FileLevelPageControlBuilder {
public string PageBaseType {
get;
set;
}
public override void ProcessGeneratedCode(
CodeCompileUnit codeCompileUnit,
CodeTypeDeclaration baseType,
CodeTypeDeclaration derivedType,
CodeMemberMethod buildMethod,
CodeMemberMethod dataBindingMethod) {
// If we find got a base class string, use it
if (PageBaseType != null) {
derivedType.BaseTypes[0] = new CodeTypeReference(PageBaseType);
}
}
}
}
And here's the custom view page classes: the non-generic base (#3 above) and the generic derived class (#4 above):
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Diagnostics.CodeAnalysis;
using System.Web.Mvc;
namespace JG.ParserFilter
{
[FileLevelControlBuilder(typeof(JG.ParserFilter.CustomViewPageControlBuilder))]
public class CustomViewPage : System.Web.Mvc.ViewPage //, IAttributeAccessor
{
public string MyNewProperty { get; set; }
}
[FileLevelControlBuilder(typeof(JG.ParserFilter.CustomViewPageControlBuilder))]
public class CustomViewPage<TModel> : CustomViewPage
where TModel : class
{
// code copied from source of ViewPage<T>
private ViewDataDictionary<TModel> _viewData;
public new AjaxHelper<TModel> Ajax
{
get;
set;
}
public new HtmlHelper<TModel> Html
{
get;
set;
}
public new TModel Model
{
get
{
return ViewData.Model;
}
}
[SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
public new ViewDataDictionary<TModel> ViewData
{
get
{
if (_viewData == null)
{
SetViewData(new ViewDataDictionary<TModel>());
}
return _viewData;
}
set
{
SetViewData(value);
}
}
public override void InitHelpers()
{
base.InitHelpers();
Ajax = new AjaxHelper<TModel>(ViewContext, this);
Html = new HtmlHelper<TModel>(ViewContext, this);
}
protected override void SetViewData(ViewDataDictionary viewData)
{
_viewData = new ViewDataDictionary<TModel>(viewData);
base.SetViewData(_viewData);
}
}
}
And here are the corresponding classes for user controls (#5 above) :
namespace JG.ParserFilter
{
using System.Diagnostics.CodeAnalysis;
using System.Web.Mvc;
using System.Web.UI;
[FileLevelControlBuilder(typeof(JG.ParserFilter.CustomViewUserControlControlBuilder))]
public class CustomViewUserControl : System.Web.Mvc.ViewUserControl
{
public string MyNewProperty { get; set; }
}
public class CustomViewUserControl<TModel> : CustomViewUserControl where TModel : class
{
private AjaxHelper<TModel> _ajaxHelper;
private HtmlHelper<TModel> _htmlHelper;
private ViewDataDictionary<TModel> _viewData;
public new AjaxHelper<TModel> Ajax {
get {
if (_ajaxHelper == null) {
_ajaxHelper = new AjaxHelper<TModel>(ViewContext, this);
}
return _ajaxHelper;
}
}
public new HtmlHelper<TModel> Html {
get {
if (_htmlHelper == null) {
_htmlHelper = new HtmlHelper<TModel>(ViewContext, this);
}
return _htmlHelper;
}
}
public new TModel Model {
get {
return ViewData.Model;
}
}
[SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
public new ViewDataDictionary<TModel> ViewData {
get {
EnsureViewData();
return _viewData;
}
set {
SetViewData(value);
}
}
protected override void SetViewData(ViewDataDictionary viewData) {
_viewData = new ViewDataDictionary<TModel>(viewData);
base.SetViewData(_viewData);
}
}
}
namespace JG.ParserFilter {
using System.CodeDom;
using System.Web.UI;
internal sealed class CustomViewUserControlControlBuilder : FileLevelUserControlBuilder {
internal string UserControlBaseType {
get;
set;
}
public override void ProcessGeneratedCode(
CodeCompileUnit codeCompileUnit,
CodeTypeDeclaration baseType,
CodeTypeDeclaration derivedType,
CodeMemberMethod buildMethod,
CodeMemberMethod dataBindingMethod) {
// If we find got a base class string, use it
if (UserControlBaseType != null) {
derivedType.BaseTypes[0] = new CodeTypeReference(UserControlBaseType);
}
}
}
}
Finally, here's a sample View which shows this in action:
<%# Page Language="C#" MyNewProperty="From #Page directive!" Inherits="JG.ParserFilter.CustomViewPage<MvcApplication1.Models.FooModel>" %>
<%=Model.SomeString %>
<br /><br />this.MyNewPrroperty = <%=MyNewProperty%>
</asp:Content>