How do I get the collection of Model State Errors in ASP NET MVC

Question

How do I get the collection of errors in a view   I don t want to use the Html Helper Validation Summary or Validation Message  Instead I want to check for errors and if any display them in specific format  Also on the input controls I want to check for a specific property error and add a class to the input    P S  I m using the Spark View Engine but the idea should be the same   So I figured I could do something like      lt if condition    ModelState Errors Count  gt  0   gt    DispalyErrorSummary    lt  if gt       and also      lt input type  text  value    Model Name           class    ModelState Errors  Name      string empty  error    gt          Or something like that   UPDATE  My final solution looked like this    lt input type  text  value    ViewData Model Name           class  text error   ViewData ModelState IsValid  amp  amp                              ViewData ModelState  Name   Errors Count    gt  0           id  Name  name  Name    gt    This only adds the error css class if this property has an error

User · Answer

If you don t know what property caused the error  you can  using reflection  loop over all properties   public static String ShowAllErrors lt T gt  this HtmlHelper helper        StringBuilder sb   new StringBuilder        Type myType   typeof T       PropertyInfo   propInfo   myType GetProperties         foreach  PropertyInfo prop in propInfo            foreach  var e in helper ViewData ModelState prop Name  Errors                TagBuilder div   new TagBuilder  div                div MergeAttribute  class    field-validation-error                div SetInnerText e ErrorMessage               sb Append div ToString                         return sb ToString        Where T is the type of your  ViewModel

User · Answer

This will give you one string with all the errors with comma separating   string validationErrors   string Join                          ModelState Values Where E   gt  E Errors Count  gt  0                       SelectMany E   gt  E Errors                       Select E   gt  E ErrorMessage                       ToArray

User · Answer

lt   ViewData ModelState IsValid   gt    or   lt   ViewData ModelState Values Any x   gt  x Errors Count  gt   1    gt    and for a specific property      lt   ViewData ModelState  Property   Errors   gt     Note this returns a collection

User · Answer

Putting together several answers from above  this is what I ended up using   var validationErrors   ModelState Values Where E   gt  E Errors Count  gt  0       SelectMany E   gt  E Errors       Select E   gt  E ErrorMessage       ToList      validationErrors ends up being a List lt string gt  that contains each error message  From there  it s easy to do what you want with that list

User · Answer

To just get the errors from the ModelState  use this Linq   var modelStateErrors   this ModelState Keys SelectMany key   gt  this ModelState key  Errors

User · Answer

Got this from BrockAllen s answer that worked for me  it displays the keys that have errors      var errors       from item in ModelState     where item Value Errors Count  gt  0     select item Key      var keys   errors ToArray     Source  https   forums asp net t 1805163 aspx Get the Key value of the Model error

User · Answer

Condensed version of  ChrisMcKenzie s answer   var modelStateErrors   this ModelState Values SelectMany m   gt  m Errors

User · Answer

Thanks Chad   To show all the errors associated with the key  here s what I came up with   For some reason the base Html ValidationMessage helper only shows the first error associated with the key        lt    Html ShowAllErrors mykey    gt    HtmlHelper       public static String ShowAllErrors this HtmlHelper helper  String key            StringBuilder sb   new StringBuilder            if  helper ViewData ModelState key     null                foreach  var e in helper ViewData ModelState key  Errors                    TagBuilder div   new TagBuilder  div                    div MergeAttribute  class    field-validation-error                    div SetInnerText e ErrorMessage                   sb Append div ToString                                     return sb ToString

User · Answer

Here is the VB   Dim validationErrors As String   String Join      ModelState Values Where Function E  E Errors Count  gt  0  SelectMany Function E  E Errors   Select  Function E  E ErrorMessage  ToArray

[html] How do I get the collection of Model State Errors in ASP.NET MVC?

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