Cannot perform runtime binding on a null reference But it is NOT a null reference

Question

using  MVC 4  ASP NET Razor  I m getting an error that looks like it shouldn t be possible  It tells me that i m using a null-reference  States  but clearly it is being set    Controller   public ActionResult Index         Dictionary lt int  string gt  states   new Dictionary lt int  string gt                    -1   a              0   b              1   c              2   d                  assigning states     ViewBag States   states       foreach  KeyValuePair lt int  string gt  de in ViewBag States                Debug WriteLine de Key             return View        The View     lt div class  search-input  gt       lt select gt           foreach  KeyValuePair lt int  string gt  de in ViewBag States                         lt option value   de Key  gt  de Value lt  option gt                 lt  select gt   lt  div gt    The error    Cannot perform runtime binding on a null reference Line 54   foreach  KeyValuePair lt int  string gt  de in ViewBag States

User · Answer

My solution to this error was that a copy and paste from another project that had a reference to  Model Id  This particular page didn t have a model but the error line was so far off from the actual error I about never found it

User · Answer

Set    Dictionary lt int  string gt  states   new Dictionary lt int  string gt      as a property outside the function and inside the function insert the entries  it should work

User · Answer

This error happens when you have a ViewBag Non-Existent in your razor code calling a method  Controller public ActionResult Accept int id        return View       razor   lt div class  quot form-group quot  gt         Html LabelFor model   gt  model ToId   quot To quot   htmlAttributes  new    class    quot control-label col-md-2 quot           lt div class  quot col-md-10 quot  gt              Html Flag Model from        lt  div gt   lt  div gt   lt div class  quot form-group quot  gt        lt div class  quot col-md-10 quot  gt             lt input value  quot  ViewBag MaximounAmount ToString   quot    gt    HERE is the error           lt  div gt   lt  div gt   For some reason  the  net aren t able to show the error in the correct line  Normally this causes a lot of wasted time

User · Answer

Found solution  I had typo in my view  ViewBag Typo  lt -- this caused the error  but the debugger placed the exception at a irrelevant place

User · Answer

This exception is also thrown when a non-existent property is being updated dynamically  using reflection    If one is using reflection to dynamically update property values  it s worth checking to make sure the passed PropertyName is identical to the actual property   In my case  I was attempting to update Employee firstName  but the property was actually Employee FirstName   Worth keeping in mind

User · Answer

You must define states not equal to null     if  ViewBag States   null         foreach  KeyValuePair lt int  string gt  de in ViewBag States                value   de Key  gt  de Value

[c#] Cannot perform runtime binding on a null reference, But it is NOT a null reference

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