SaveChanges() from an EntityFramework context fails silently

The best way I have found to catch EF errors is by overriding the SaveChange method like below. If you have a centered place to recover logs (like log4net), the function will be able to insert it there.

public partial class Business
{
    /// <summary>Override the SaveChange to return better error messages</summary>
    public override int SaveChanges()
    {
        try {
            return base.SaveChanges();
        }
        catch (System.Data.Entity.Validation.DbEntityValidationException ex) {
            // Retrieve the error messages as a list of strings.
            var errorMessages = ex.EntityValidationErrors
                    .SelectMany(x => x.ValidationErrors)
                    .Select(x => x.ErrorMessage);

            // Join the list to a single string.
            var fullErrorMessage = string.Join("; ", errorMessages);

            // Combine the original exception message with the new one.
            var exceptionMessage = string.Concat(ex.Message, " The validation errors are: ", fullErrorMessage);

            // Add some logging with log4net here


            // Throw a new DbEntityValidationException with the improved exception message.
            throw new System.Data.Entity.Validation.DbEntityValidationException(exceptionMessage, ex.EntityValidationErrors);

        }
    }