public async Task SaveAsync() { try { await _phoneBookDataContext.SaveChangesAsync(); } catch (DbEntityValidationException ex) { // Retrieve the error messages as a list of strings. IEnumerable <string> errorMessages = ex.EntityValidationErrors .SelectMany(x => x.ValidationErrors) .Select(x => x.ErrorMessage); // Join the list to a single string. string fullErrorMessage = string.Join(" ", errorMessages); // Combine the original exception message with the new one. string exceptionMessage = string.Concat(ex.Message, "The validation errors are: ", fullErrorMessage); // Throw a new DbEntityValidationException with the improved exception message. throw new DbEntityValidationException(exceptionMessage, ex.EntityValidationErrors); } }
public async Task <OperationResult> CompleteAsync() { await context.SaveChangesAsync(); return(new OperationResult(true, "Request completed successfully")); }