public void CreateComment(Comment comment) { if(comment == null) { throw new ArgumentNullException("comment","comment is null"); } dbContext.Comments.Add(comment); }
public void UpdateComment(Comment comment) { if (comment == null) { throw new ArgumentNullException("comment","comment is null"); } Comment existComment = dbContext.Comments.FirstOrDefault(x => x.CommentId == comment.CommentId); if(existComment == null) { throw new InvalidDataException("This comment doesn't exist in current data base"); } else { if (comment != existComment) { CopyCommentsProperties(comment, existComment); } dbContext.Entry(existComment).State = System.Data.EntityState.Modified; } }
private void CopyCommentsProperties(Comment fromComment, Comment toComment) { if(fromComment == null) { throw new ArgumentNullException("fromComment"); } if(toComment == null) { throw new ArgumentNullException("toComment"); } else { toComment.CreateDate = fromComment.CreateDate; toComment.PresentationId = fromComment.PresentationId; toComment.Text = fromComment.Text; toComment.UserId = fromComment.UserId; } }
public void DeleteComment(Comment comment) { if(comment == null) { throw new ArgumentNullException("comment"); } var existComment = dbContext.Comments.FirstOrDefault(x => x.CommentId == comment.CommentId); if(existComment != null) { dbContext.Comments.Remove(existComment); } else { throw new InvalidDataException("This comment doesn't exist in current data base"); } }