ModelState IsValid false why

Question

Where can I find the list of errors of which make the ModelState invalid  I didn t see any errors property on the ModelState object

User · Answer

bool hasErrors    ViewData ModelState Values Any x   gt  x Errors Count  gt  1     or iterate with      foreach  ModelState state in ViewData ModelState Values Where x   gt  x Errors Count  gt  0

User · Answer

If you remove the check for the ModelsState IsValid and let it error  if you copy this line   System Data Entity Validation DbEntityValidationException  exception  EntityValidationErrors and paste it in the watch section in Visual Studio it will give you exactly what the error is  Saves a lot of time checking where the error is

User · Answer

As you are probably programming in Visual studio you d better take advantage of the possibility of using breakpoints for such easy debugging steps  getting an idea what the problem is as in your case   Just place them just in front   at the place where you check ModelState isValid and hover over the ModelState  Now you can easily browse through all the values inside and see what error causes the isvalid return false

User · Answer

Paste the below code in the ActionResult of your controller and place the debugger at this point   var errors   ModelState      Where x   gt  x Value Errors Count  gt  0       Select x   gt  new   x Key  x Value Errors         ToArray

User · Answer

Sometimes a binder throwns an exception with no error message  You can retrieve the exception with the following snippet to find out whats wrong    Often if the binder is trying to convert strings to complex types etc    if   ModelState IsValid                var errors   ModelState SelectMany x   gt  x Value Errors Select z   gt  z Exception        Breakpoint  Log or examine the list with Exceptions

User · Answer

As has just happened to me - this can also happen when you add a required property to your model without updating your form  In this case the ValidationSummary will not list the error message

User · Answer

About  can it be that 0 errors and IsValid    false   here s MVC source code from https   github com Microsoft referencesource blob master System Web ModelBinding ModelStateDictionary cs L37-L41  public bool IsValid       get           return Values All modelState   gt  modelState Errors Count    0             Now  it looks like it can t be  Well  that s for ASP NET MVC v1

User · Answer

The ModelState property on the controller is actually a ModelStateDictionary object   You can iterate through the keys on the dictionary and use the IsValidField method to check if that particular field is valid

[c#] ModelState.IsValid == false, why?

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