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");
}
}