Validation failed for one or more entities See EntityValidationErrors property for more details

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I am having this error when seeding my database with code first approach      Validation failed for one or more entities  See  EntityValidationErrors  property for more details    To be honest I don t know how to check the content of the validation errors  Visual Studio shows me that it s an array with 8 objects  so 8 validation errors   This was working with my previous model  but I made a few changes that I explain below    I had an enum called Status  I changed it to a class called Status I changed the class ApplicantsPositionHistory to have 2 foreign key to the same table   Excuse me for the long code  but I have to paste it all   The exception is thrown in the last line of the following code   namespace Data Model         public class Position                DatabaseGenerated System ComponentModel DataAnnotations DatabaseGeneratedOption Identity              public int PositionID   get  set              Required ErrorMessage    Position name is required              StringLength 20  MinimumLength   3  ErrorMessage    Name should not be longer than 20 characters              Display Name    Position name                          public string name   get  set              Required ErrorMessage    Number of years is required              Display Name    Number of years                    public int yearsExperienceRequired   get  set             public virtual ICollection lt ApplicantPosition gt  applicantPosition   get  set               public class Applicant                DatabaseGenerated System ComponentModel DataAnnotations DatabaseGeneratedOption Identity                 public int ApplicantID   get  set              Required ErrorMessage    Name is required              StringLength 20  MinimumLength   3  ErrorMessage  Name should not be longer than 20 characters              Display Name    First and LastName            public string name   get  set              Required ErrorMessage    Telephone number is required              StringLength 10  MinimumLength   3  ErrorMessage    Telephone should not be longer than 20 characters              Display Name    Telephone Number            public string telephone   get  set              Required ErrorMessage    Skype username is required              StringLength 10  MinimumLength   3  ErrorMessage    Skype user should not be longer than 20 characters              Display Name    Skype Username            public string skypeuser   get  set             public byte   photo   get  set             public virtual ICollection lt ApplicantPosition gt  applicantPosition   get  set               public class ApplicantPosition                Key           Column  ApplicantID   Order   0           public int ApplicantID   get  set              Key           Column  PositionID   Order   1           public int PositionID   get  set             public virtual Position Position   get  set             public virtual Applicant Applicant   get  set              Required ErrorMessage    Applied date is required              DisplayFormat DataFormatString     0 d    ApplyFormatInEditMode   true            Display Name    Date applied                 public DateTime appliedDate   get  set              Column  StatusID   Order   0           public int StatusID   get  set             public Status CurrentStatus   get  set                NotMapped            public int numberOfApplicantsApplied                           get                                   int query                           from ap in Position                         where ap Status     int Status Applied                         select ap                               Count                      return query                                         public class Address                StringLength 20  MinimumLength   3  ErrorMessage    Country should not be longer than 20 characters             public string Country   get  set              StringLength 20  MinimumLength   3  ErrorMessage    City  should not be longer than 20 characters             public string City   get  set              StringLength 50  MinimumLength   3  ErrorMessage    Address  should not be longer than 50 characters              Display Name    Address Line 1                 public string AddressLine1   get  set              Display Name    Address Line 2            public string AddressLine2   get  set                  public class ApplicationPositionHistory                DatabaseGenerated System ComponentModel DataAnnotations DatabaseGeneratedOption Identity           public int ApplicationPositionHistoryID   get  set             public ApplicantPosition applicantPosition   get  set              Column  oldStatusID            public int oldStatusID   get  set              Column  newStatusID            public int newStatusID   get  set             public Status oldStatus   get  set             public Status newStatus   get  set              StringLength 500  MinimumLength   3  ErrorMessage    Comments  should not be longer than 500 characters              Display Name    Comments            public string comments   get  set              DisplayFormat DataFormatString     0 d    ApplyFormatInEditMode   true            Display Name    Date                 public DateTime dateModified   get  set               public class Status                DatabaseGenerated System ComponentModel DataAnnotations DatabaseGeneratedOption Identity           public int StatusID   get  set              StringLength 20  MinimumLength   3  ErrorMessage    Status  should not be longer than 20 characters              Display Name    Status            public string status   get  set                using System  using System Collections Generic  using System Linq  using System Text  using System Data Entity  using System IO   namespace Data Model       public class HRContextInitializer   DropCreateDatabaseAlways lt HRContext gt                protected override void Seed HRContext context                         region Status             Status applied   new Status     status    Applied                 Status reviewedByHR   new Status     status    Reviewed By HR                 Status approvedByHR   new Status     status    Approved by HR                 Status rejectedByHR   new Status     status    Rejected by HR                 Status assignedToTechnicalDepartment   new Status     status    Assigned to Technical Department                 Status approvedByTechnicalDepartment   new Status     status    Approved by Technical Department                 Status rejectedByTechnicalDepartment   new Status     status    Rejected by Technical Department                  Status assignedToGeneralManager   new Status     status    Assigned to General Manager                 Status approvedByGeneralManager   new Status     status    Approved by General Manager                 Status rejectedByGeneralManager   new Status     status    Rejected by General Manager                  context Status Add applied               context Status Add reviewedByHR               context Status Add approvedByHR               context Status Add rejectedByHR               context Status Add assignedToTechnicalDepartment               context Status Add approvedByTechnicalDepartment               context Status Add rejectedByTechnicalDepartment               context Status Add assignedToGeneralManager               context Status Add approvedByGeneralManager               context Status Add rejectedByGeneralManager                 endregion                   region Position             Position netdeveloper   new Position     name     net developer   yearsExperienceRequired   5                Position javadeveloper   new Position     name    java developer   yearsExperienceRequired   5                context Positions Add netdeveloper               context Positions Add javadeveloper                 endregion               region Applicants             Applicant luis   new Applicant                                 name    Luis                   skypeuser    le valencia                   telephone    0491732825                   photo   File ReadAllBytes   C  Users LUIS SIMBIOS Documents Visual Studio 2010 Projects SlnHR HRRazorForms Content pictures 1 jpg                               Applicant john   new Applicant                                 name    John                   skypeuser    jo valencia                   telephone    3435343543                   photo   File ReadAllBytes   C  Users LUIS SIMBIOS Documents Visual Studio 2010 Projects SlnHR HRRazorForms Content pictures 2 jpg                               context Applicants Add luis               context Applicants Add john                 endregion               region ApplicantsPositions             ApplicantPosition appicantposition   new ApplicantPosition                                 Applicant   luis                  Position   netdeveloper                  appliedDate   DateTime Today                  StatusID   1                             ApplicantPosition appicantposition2   new ApplicantPosition                                 Applicant   john                  Position   javadeveloper                  appliedDate   DateTime Today                  StatusID   1                                     context ApplicantsPositions Add appicantposition                           context ApplicantsPositions Add appicantposition2                 endregion              context SaveChanges    --- gt  gt  Error here

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Just throwing my two cents in     Within my dbConfiguration cs  I like to wrap my context SaveChanges   method into a try catch and produce an output text file that allows me to read the Error s  clearly  and this code also timestamps them - handy if you run into more than one error at different times           try                       context SaveChanges                      catch  DbEntityValidationException e                          Create empty list to capture Validation error s              var outputLines   new List lt string gt                  foreach  var eve in e EntityValidationErrors                                outputLines Add                         DateTime Now   Entity of type    eve Entry Entity GetType   Name    in state    eve Entry State    has the following validation errors                     outputLines AddRange eve ValidationErrors Select ve   gt                        - Property     ve PropertyName     Error     ve ErrorMessage                                    Write to external file             File AppendAllLines   c  temp dbErrors txt   outputLines               throw

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Note that Entity GetType   BaseType Name gives the type name you specified  not the one with all the hex digits in its name

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This error occurs mostly because of field size  CHECK all the field sizes in a database table

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For anyone who works in VB NET  Try Catch ex As DbEntityValidationException     For Each a In ex EntityValidationErrors         For Each b In a ValidationErrors             Dim st1 As String   b PropertyName             Dim st2 As String   b ErrorMessage         Next     Next End Try

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If you re using IIS with Windows Authentification and Entity Framework  be careful to use authorize   I tried to POST without authorize and it didn t work  and get this error on db SaveChangesAsync     while all other verbs GET and DELETE were working   But when I added AuthorizeAttribute as annotation  it worked    Authorize  public async Task lt IHttpActionResult gt  Post

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This works for me   var modelState   ModelState Values  if   ModelState IsValid        return RedirectToAction  Index    Home   model       Put a breakpoint on if statement  Then you can check modelState in debug windows  On every value you can see if there is an error and even the error message  That s it  When you don t need it anymore  just delete or comment the line   I hope this will help   If asked  I can provide detailed screenshot in the debug window

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To be honest I don t know how to check the content of the validation errors  Visual Studio shows me that it s an array with 8 objects  so 8 validation errors    Actually you should see the errors if you drill into that array in Visual studio during debug  But you can also catch the exception and then write out the errors to some logging store or the console   try          Your code           Could also be before try if you know the exception occurs in SaveChanges      context SaveChanges      catch  DbEntityValidationException e        foreach  var eve in e EntityValidationErrors                Console WriteLine  Entity of type    0    in state    1    has the following validation errors                eve Entry Entity GetType   Name  eve Entry State           foreach  var ve in eve ValidationErrors                        Console WriteLine  - Property     0     Error     1                      ve PropertyName  ve ErrorMessage                       throw      EntityValidationErrors is a collection which represents the entities which couldn t be validated successfully  and the inner collection ValidationErrors per entity is a list of errors on property level   These validation messages are usually helpful enough to find the source of the problem    Edit  A few slight improvements   The value of the offending property can be included in the inner loop like so           foreach  var ve in eve ValidationErrors                        Console WriteLine  - Property     0     Value     1     Error     2                      ve PropertyName                  eve Entry CurrentValues GetValue lt object gt  ve PropertyName                   ve ErrorMessage               While debugging Debug Write might be preferable over Console WriteLine as it works in all kind of applications  not only console applications  thanks to  Bart for his note in the comments below    For web applications that are in production and that use Elmah for exception logging it turned out to be very useful for me to create a custom exception and overwrite SaveChanges in order to throw this new exception   The custom exception type looks like this   public class FormattedDbEntityValidationException   Exception       public FormattedDbEntityValidationException DbEntityValidationException innerException            base null  innerException                   public override string Message               get                       var innerException   InnerException as DbEntityValidationException              if  innerException    null                                StringBuilder sb   new StringBuilder                     sb AppendLine                    sb AppendLine                    foreach  var eve in innerException EntityValidationErrors                                        sb AppendLine string Format  - Entity of type    0    in state    1    has the following validation errors                            eve Entry Entity GetType   FullName  eve Entry State                        foreach  var ve in eve ValidationErrors                                                sb AppendLine string Format  -- Property     0     Value     1     Error     2                                  ve PropertyName                              eve Entry CurrentValues GetValue lt object gt  ve PropertyName                               ve ErrorMessage                                                            sb AppendLine                     return sb ToString                               return base Message                      And SaveChanges can be overwritten the following way   public class MyContext   DbContext                   public override int SaveChanges                 try                       return base SaveChanges                      catch  DbEntityValidationException e                        var newException   new FormattedDbEntityValidationException e               throw newException                      A few remarks    The yellow error screen that Elmah shows in the web interface or in the sent emails  if you have configured that  now displays the validation details directly at the top of the message  Overwriting the Message property in the custom exception instead of overwriting ToString   has the benefit that the standard ASP NET  Yellow screen of death  YSOD   displays this message as well  In contrast to Elmah the YSOD apparently doesn t use ToString    but both display the Message property  Wrapping the original DbEntityValidationException as inner exception ensures that the original stack trace will still be available and is displayed in Elmah and the YSOD  By setting a breakpoint on the line throw newException  you can simply inspect the newException Message property as a text instead of drilling into the validation collections which is a bit awkward and doesn t seem to work easily for everyone  see comments below

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I faced this error before   when I tried to update specific field in my model in entity framwork    Letter letter   new Letter  ID   letterId  ExportNumber   letterExportNumber EntityState   EntityState Modified   LetterService ChangeExportNumberfor letter     ----------   public int ChangeExportNumber Letter letter                int result   0          using  var db     LettersGeneratorEntities  GetContext                           db Letters Attach letter               db Entry letter  Property x   gt  x ExportNumber  IsModified   true              result    db SaveChanges                      return result          and according the above answers   I found the Validation message The SignerName field is required   which pointing to field in my model   and when I checked my database schema I found     so off coure ValidationException has its right to raise   and according to this field I want it to be nullable   I dont know how I messed it   so I changed that field to allow Null  and by this my code will not give me this error again      so This error maybe will happened if you invalidate Your Data integrity of your database

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I also faced the same problem  I updated my  edmx from the database after that the exception has vanished

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just Check Your Database Table Field Length    Your Input Text Is Greater than the length of column field data type length

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While you are in debug mode within the catch       block open up the  QuickWatch  window  ctrl alt q  and paste in there     System Data Entity Validation DbEntityValidationException ex  EntityValidationErrors  or     System Data Entity Validation DbEntityValidationException  exception  EntityValidationErrors  If you are not in a try catch or don t have access to the exception object   This will allow you to drill down into the ValidationErrors tree  It s the easiest way I ve found to get instant insight into these errors

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Per  Slauma s answer and  Milton s suggestion I ve extended our base class s custom save method with a try catch that will handle  and hence log in our error logging   these sorts of exceptions      Where  BaseDB  is your Entities object     it could be  this  in a different design  public void Save bool  validateEntities   null        try                 Capture and set the validation state if we decide to         bool validateOnSaveEnabledStartState   BaseDB Configuration ValidateOnSaveEnabled          if  validateEntities HasValue              BaseDB Configuration ValidateOnSaveEnabled   validateEntities Value           BaseDB SaveChanges               Revert the validation state when done         if  validateEntities HasValue              BaseDB Configuration ValidateOnSaveEnabled   validateOnSaveEnabledStartState            catch  DbEntityValidationException e                StringBuilder sb   new StringBuilder            foreach  var eve in e EntityValidationErrors                        sb AppendLine string Format  Entity of type    0    in state    1    has the following validation errors                                                 eve Entry Entity GetType   Name                                              eve Entry State                foreach  var ve in eve ValidationErrors                                sb AppendLine string Format  - Property     0     Error     1                                                  ve PropertyName                                              ve ErrorMessage                                    throw new DbEntityValidationException sb ToString    e

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Catch the exception in a try catch and then quick watch or ctrl d  amp  ctrl q and you can drill down to the EntityValidationErrors

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You can do it from Visual Studio during debugging without writing any code  not even a catch block   Just add a watch with the name     System Data Entity Validation DbEntityValidationException  exception  EntityValidationErrors   The watch expression  exception displays any exception thrown in the current context  even if it has not been caught and assigned to a variable   Based on http   mattrandle me viewing-entityvalidationerrors-in-visual-studio

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Check whether you have Not Null constraint in your table columns and you are not passes the value for that column while insert Update operations  That Causes this exception in entity framework

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For a quick way to see the first error without even adding a watch you can paste this in the Immediate Window     System Data Entity Validation DbEntityValidationException  exception       EntityValidationErrors First        ValidationErrors First

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Please check the fields value you are passing  are valid and according to database fields  For example number of characters passed in a particular field are less than the characters defined in database table field

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Here s how you can check the contents of the EntityValidationErrors in Visual Studio  without writing any extra code  i e  during Debugging in the IDE   The Problem   You are right  the Visual Studio debugger s View Details Popup doesn t show the actual errors inside the EntityValidationErrors collection       The Solution   Just add the following expression in a Quick Watch window and click Reevaluate     System Data Entity Validation DbEntityValidationException  exception  EntityValidationErrors  In my case  see how I am able to expand into the ValidationErrors List inside the EntityValidationErrors collection     References  mattrandle me blog post   yoel s answer

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I had to write this in the Immediate window  3     exception as System Data Entity Validation DbEntityValidationException  EntityValidationErrors as System Collections Generic List lt System Data Entity Validation DbEntityValidationResult gt   0  ValidationErrors as System Collections Generic List lt System Data Entity Validation DbValidationError gt   0    in order to get deep into the exact error

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What i found   when i got  EntityValidationErrors  error is that    i have a field in my database  db1  in table  tbladdress  as  address1  which has size of 100  i e address varchar 100  null  and i was passing value more than 100 characters  and this leading to error while saving data to database      So you must Check the data you are passing to the field

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In my case it was because of the length of the database field is less than the length of the input field   database table  create table user    Username nvarchar 5  not  null      My input  User newUser   new User        Username    123456       the value for Username length is 5 which is lessthan 6       this may help someone

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Was also struggling with this error and based on the topic here and this answer was able to figure out snippet to copy paste without the need to figure out what has to be imported  excellent for C  beginners   code below   try     context SaveChanges      catch  System Data Entity Validation DbEntityValidationException ex      foreach  var entityValidationErrors in ex EntityValidationErrors          foreach  var validationError in entityValidationErrors ValidationErrors              System Diagnostics Debug WriteLine  Property      validationError PropertyName     Error      validationError ErrorMessage

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Here s another way to do it instead of using foreach loops for looking inside EntityValidationErrors  Of course you can format the message to your own liking    try              your code goes here           catch  DbEntityValidationException ex                 Console Write   Validation errors   string Join Environment NewLine  ex EntityValidationErrors SelectMany vr   gt  vr ValidationErrors Select err   gt     err PropertyName  -  err ErrorMessage         ex           throw

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Using the answer of  Slauma i have made a code snippet  a surrounds with snippet  for better use    lt  xml version  1 0  encoding  utf-8   gt   lt CodeSnippets xmlns  http   schemas microsoft com VisualStudio 2005 CodeSnippet  gt     lt CodeSnippet Format  1 0 0  gt       lt Header gt         lt SnippetTypes gt           lt SnippetType gt SurroundsWith lt  SnippetType gt         lt  SnippetTypes gt         lt Title gt ValidationErrorsTryCatch lt  Title gt         lt Author gt Phoenix lt  Author gt         lt Description gt         lt  Description gt         lt HelpUrl gt         lt  HelpUrl gt         lt Shortcut gt         lt  Shortcut gt       lt  Header gt       lt Snippet gt         lt Code Language  csharp  gt  lt   CDATA try        selected   end    catch  System Data Entity Validation DbEntityValidationException e        foreach  var eve in e EntityValidationErrors                Console WriteLine  Entity of type    0    in state    1    has the following validation errors                eve Entry Entity GetType   Name  eve Entry State           foreach  var ve in eve ValidationErrors                        Console WriteLine  - Property     0     Error     1                      ve PropertyName  ve ErrorMessage                       throw      gt  lt  Code gt       lt  Snippet gt     lt  CodeSnippet gt   lt  CodeSnippets gt

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As mentioned in other posts  simply catch the exception in DbEntityValidationException class  Which will give you watever you required during error cases    try               catch DbEntityValidationException ex

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If you are simply catching a generic exception  it may benefit you to cast this as a DbEntityValidationException   This type of an exception has a Validation Errors property  and continuing to expand your way into them  you will find all the problems   For example  if you put a break point in the catch  you can throw the following into a watch     System Data Entity Validation DbEntityValidationException   ex    An example of an error is if a field does not allow nulls  and you have a null string  you ll see it say that the field is required

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The answer from  Slauma is really great but I found that it didnt t work when a ComplexType property was invalid    For example  say you have a property Phone of the complex type PhoneNumber  If the AreaCode property is invalid  the property name in ve PropertyNames is  Phone AreaCode   This causes the call to eve Entry CurrentValues lt object gt  ve PropertyName  to fail    To fix this  you can split the property name at each    then recurse through the resulting array of property names  Finally  when you arrive at the bottom of the chain  you can simply return the value of the property   Below is  Slauma s FormattedDbEntityValidationException class with support for ComplexTypes   Enjoy    Serializable  public class FormattedDbEntityValidationException   Exception       public FormattedDbEntityValidationException DbEntityValidationException innerException            base null  innerException                   public override string Message               get                       var innerException   InnerException as DbEntityValidationException              if  innerException    null  return base Message               var sb   new StringBuilder                 sb AppendLine                sb AppendLine                foreach  var eve in innerException EntityValidationErrors                                sb AppendLine string Format  - Entity of type    0    in state    1    has the following validation errors                        eve Entry Entity GetType   FullName  eve Entry State                    foreach  var ve in eve ValidationErrors                                        object value                      if  ve PropertyName Contains                                                     var propertyChain   ve PropertyName Split                               var complexProperty   eve Entry CurrentValues GetValue lt DbPropertyValues gt  propertyChain First                             value   GetComplexPropertyValue complexProperty  propertyChain Skip 1  ToArray                                               else                                               value   eve Entry CurrentValues GetValue lt object gt  ve PropertyName                                             sb AppendLine string Format  -- Property     0     Value     1     Error     2                              ve PropertyName                          value                          ve ErrorMessage                                                sb AppendLine                 return sb ToString                         private static object GetComplexPropertyValue DbPropertyValues propertyValues  string   propertyChain                var propertyName   propertyChain First            return propertyChain Count      1                propertyValues propertyName                 GetComplexPropertyValue  DbPropertyValues propertyValues propertyName   propertyChain Skip 1  ToArray

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In debug  you can enter this in your QuickWatch expression evaluator entry field   context GetValidationErrors

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This could actually do it without having to write code    In your catch block  add a break point at the following line of code   catch  Exception exception         Now if you hover on exception or add it to the Watch and then navigate into the exception details as shown below  you will see which particular column s  is  are causing the problem as this error usually occurs when a table-constraint is violated      Large image

[c#] Validation failed for one or more entities. See 'EntityValidationErrors' property for more details

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