ERRORS IN PROJECT VALIDATION IDVD HOW TO
Throw new DbEntityValidationException(exceptionMessage, ex.Learn how to view, understand, and fix program validation errors to make sure your program is valid and working correctly. Var exceptionMessage = string.Concat(ex.Message, ” The validation errors are: “, fullErrorMessage) Var fullErrorMessage = string.Join(“ “, errorMessages) Override base SaveChanges to expand out validation errors so client gets an actually helpful message Public partial class M圜ontext : DbContext This article is also featured on StackOverflow and My Personal Blog! Share thisīelow is a version that includes all the necessary includes:
ERRORS IN PROJECT VALIDATION IDVD CODE
I hope this blog saves you time debugging, so you can spend more time writing awesome code instead! 🙂 So if you require even more information, you can change the above code to output information about these entities. The DbEntityValidationException also contains the entities that caused the validation errors. The validation errors are: The field PhoneNumber must be a string or array type with a maximum length of '12' The LastName field is required. See 'EntityValidationErrors' property for more details. DbEntityValidationException: Validation failed for one or more entities. From now on, your exceptions will look like this: That’s it! The rest of your code will automatically use the overridden SaveChanges so you don’t have to change anything else. Throw new DbEntityValidationException(exceptionMessage, ex.EntityValidationErrors) Throw a new DbEntityValidationException with the improved exception message. Var exceptionMessage = string.Concat(ex.Message, ' The validation errors are: ', fullErrorMessage) Combine the original exception message with the new one.
Var fullErrorMessage = string.Join(' ', errorMessages) Var errorMessages = ex.EntityValidationErrors Retrieve the error messages as a list of strings. Second, use the following piece of C# code to override the SaveChanges implementation.In my example, I called the file NorthwindEntities.cs, which is also the name of the class. First, create a new partial class in the same location as where your EDMX resides.Luckily, the class itself is partial, which means you can add your own class to the solution. However, changing is not recommended since the tt-file will overwrite this file on any change to the EDMX. This method is virtual and can thus be overridden. This class inherits from DbContext, which in turn contains SaveChanges, the method responsible for throwing the DbEntityValidationException. It describes the class you use in code to perform operations on the database. This file is automatically generated by. Assuming you use a database-first approach, your Visual Studio solution should contain a bunch of files like these: Fortunately, you can override the default behavior of SaveChanges. Moreover, being the lazy developer I am, I don’t want to attach a debugger to find out what field caused the error: I want the exception message to tell me in the first place!ĭbEntityValidationException is thrown by the SaveChanges method which resides on the DbContext class.
While this is certainly a valid approach, attaching debuggers isn’t always practical (e.g. This message is quite clear in its intent: Something isn’t valid and if you want to find out what that is then you should attach a debugger and inspect the exception. In this blog, I present a quick and easy way to unwrap and rethrow these exceptions with a more meaningful message.ĭevelopers who have used Entity Framework are probably familiar with the following message: While this exception is extremely valuable, the exception message omits the most important bit of information: The actual validation errors. DbEntityValidationException is the exception thrown by Entity Framework when entity validation fails.
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