asp.net mvc - Knockout MVC - VB.NET issue with IsAssignableFrom and MethodCallExpression -

i having problems library called knockout mvc. .net wrapper around knockout.js. while works pretty when using in c# based asp.net mvc project, doesn't in vb.net based project , found out why.

protected virtual string visitmethodcall(methodcallexpression m) {   ...   if (typeof(expression).isassignablefrom(m.method.returntype))     return visitmemberaccess(m.object, m.method.name);   throw new notsupportedexception(); } 

the condition evaluates false when project calls library written in vb.net. same thing in c#: working perfectly.

since not quite sure causing different behaviour, thought might idea ask community. maybe knows how line translated works both c# , vb.net.

the code can found @ ~ line 260 here.

[edit]

to clarify things: code above not need translated vb.net. problem rather, condition contains returns different results based on whether called c# or vb.net code. believe isassignablefrom behaves differently vb.net , c#... need know how condition work independent of language called from.

[edit] - example following steps reproduce problem:

1. create new asp.net mvc 4 project in visual studio 2012 using vb.net
2. add knockout mvc via package manager console (install-package kmvc)

3. ignore error (methods null), nuget script error, , add following line global.asax.vb (application_start) manually:

   modelbinders.binders.defaultbinder = new perpetuumsoft.knockout.knockoutmodelbinder()

4. add following configuration bundleconfig.vb

   bundles.add(new scriptbundle("~/bundles/knockout").include( "~/scripts/knockout-{version}.js", "~/scripts/knockout.mapping-latest.js", "~/scripts/perpetuum.knockout.js"))

5. render scriptbundle in _layout.vbhtml beneath modernizer

   @scripts.render("~/bundles/knockout")

6. add new model models folder

   imports delegatedecompiler

   public class helloworldmodel

     public property firstname string   public property lastname string    <computed>   public readonly property fullname string                 return firstname + " " + lastname       end   end property 

   end class

7. add new controller controllers folder

   public class helloworldcontroller inherits perpetuumsoft.knockout.knockoutcontroller

     '   ' get: /helloworld    function index() actionresult       return view(new helloworldmodel {                   .firstname = "john",                   .lastname = "doe"})   end function 

   end class

8. compile project mvc extension gets know model

9. right click index action in controller , select "add view.."
10. leave view name , choose create strongly-typed view, selecting helloworldmodel model; leave rest default options , click add

11. add imports statement top of view

    @imports perpetuumsoft.knockout

12. create knockout context in code section

    dim ko = html.createknockoutcontext()

13. define view , apply model under h2 tag

    <p>first name: @ko.html.textbox(function(m) m.firstname)</p>
    <p>last name: @ko.html.textbox(function(m) m.lastname)</p>
    <h2>hello, @ko.html.span(function(m) m.fullname)!</h2>
    

    @ko.apply(model)

now if compile , execute application , call helloworld controller (localhost:nnnnn/helloworld) notimplementedexception raised on line ko.apply(model).

if repeat steps above when creating asp.net mvc project c#, works expected.

please try this

in vb.net syntax of code changed.

    protected overridable function visitmethodcall(m methodcallexpression) string      if gettype(expression).isassignablefrom(m.method.returntype)         return visitmemberaccess(m.[object], m.method.name)     end if         throw new notsupportedexception()     end function 

i think there's mismatch between assembly contains type iplugin current assembly references.

you should use

 typeof (iplugin).module.fullyqualifiedname 

and

 foreach (var type in t.getinterfaces ())   {          console.writeline (type.module.fullyqualifiedname)  } 

to see particular mismatch is.