Validation failed for one or more entities. See ‘EntityValidationErrors’解决方法

You can extract all the information from the DbEntityValidationException with the following code (you need to add the namespaces: System.Data.Entity.Validation and System.Diagnostics to your using list):

catch (DbEntityValidationException dbEx)

{

    foreach (var validationErrors in dbEx.EntityValidationErrors)

    {

        foreach (var validationError in validationErrors.ValidationErrors)

        {

            Trace.TraceInformation("Property: {0} Error: {1}",

                                    validationError.PropertyName,

                                    validationError.ErrorMessage);

        }

    }

}