예제 #1
0
        protected void CountAlbums_Click(object sender, EventArgs e)
        {
            //traversing a GridView display
            //just like a list view, the only records available to us at this time out of the dataset assigned to the GridView are the rows being displayed.
            //eg, I have 100 rows, out of all of those records, I am only deal with what I want to display.
            //IF to deal with all records, No gridview, do Datasets!

            //create a List<T> to hold the counts of the display
            // need the using name space to access entity
            List <ArtistAlbumCounts> Artists = new List <ArtistAlbumCounts>();

            //reusable pointers to an instance of the specified class
            ArtistAlbumCounts item = null;
            int artistid           = 0;

            //setup the loop to traver the gridview
            foreach (GridViewRow line in AlbumList.Rows)
            {
                //access the artistid
                //use the select value instead of selected index because list can be sorted.
                //The only time to use selected index is to determin if something has been selected.
                artistid = int.Parse((line.FindControl("ArtistList") as DropDownList).SelectedValue);

                //determine if you have already created a count instance in the list<T> for this artist.
                //if Not, create a new instance fo the artist and set its count to 1.
                //if ound, increment the count (+1)

                //1. search for the art in list<T>
                //x is the current record of the find opearation is looking at at that instance
                //=> means for x, do the following:
                //ArtistID from the list of T, compare to the artistid from the grid view.
                //what will be returned is either null (not found) or the instance in the list<T>
                item = Artists.Find(x => x.ArtistId == artistid);

                if (item == null)
                {
                    //Create instance, initialize, add it List<T>,
                    item            = new ArtistAlbumCounts();
                    item.ArtistId   = artistid;
                    item.AlbumCount = 1;
                    Artists.Add(item);
                }
                else
                {
                    item.AlbumCount++;
                }
            }
            //attach the List<T> (collection) to the display control
            ArtistAlbumCountList.DataSource = Artists;
            ArtistAlbumCountList.DataBind();
        }
예제 #2
0
        protected void CountAlbums_Click(object sender, EventArgs e)
        {
            //traversing a GridView display
            //the only records available to us at this time
            //  out of the dataset assigned to the GridView
            //  are the row being display

            //create a List<T> to hold the counts of the display
            List <ArtistAlbumCounts> Artists = new List <ArtistAlbumCounts>();

            //reusable pointer to an instance of the specified class
            ArtistAlbumCounts item = null;
            int artistid           = 0;

            //setup the loop to traverse the gridview
            foreach (GridViewRow line in AlbumList.Rows)
            {
                //access the artistid
                artistid = int.Parse((line.FindControl("ArtistList") as DropDownList).SelectedValue);

                //determine if you have already created a count
                //  instance in the List<T> for this artist
                //if NOT, create a new instance for the artist and
                //  set its count to 1
                //if found, increment the counter (+1)

                //search for artist in list<T>
                //what will be return is either null (not found)
                //  or the instance in the List(T)
                item = Artists.Find(x => x.ArtistId == artistid);

                if (item == null)
                {
                    //Create instance, initialize, add to List<T>
                    item            = new ArtistAlbumCounts();
                    item.ArtistId   = artistid;
                    item.AlbumCount = 1;
                    Artists.Add(item);
                }
                else
                {
                    item.AlbumCount++;
                }
            }

            //attach the List<T> (collection) to the display control
            ArtistAlbumCountList.DataSource = Artists;
            ArtistAlbumCountList.DataBind();
        }
        protected void CountAlbums_Click(object sender, EventArgs e)
        {
            //traversing a GridView display (counting artists in List<T> within GridView)
            //the only records available to us at this time out of the data set assigned to the GridView are the rows being displayed (only counts page being shown)

            //create a List<T> to hold the counts of the display
            List <ArtistAlbumCounts> Artists = new List <ArtistAlbumCounts>();

            //reusable pointer to an instance of the specified class
            ArtistAlbumCounts item = null;
            int artistId           = 0;

            //setup the loop to traverse the GridVIew
            foreach (GridViewRow line in AlbumList.Rows)
            {
                //access the artist id
                artistId = int.Parse((line.FindControl("ArtistList") as DropDownList).SelectedValue);

                //determine if you have already created a count instance in the List<T> for this artist
                //if NOT, create a new instance for the artist and set it's count to 1
                //if Yes Increment the counter +1

                //search for artist in List<T> what will be return will either be null (Not found) or the insance in the List<T>
                item = Artists.Find(x => x.ArtistId == artistId);

                if (item == null)
                {
                    //Create Instance, Innitialize, add to list
                    item            = new ArtistAlbumCounts();
                    item.ArtistId   = artistId;
                    item.AlbumCount = 1;
                    Artists.Add(item);
                }
                else
                {
                    item.AlbumCount++;
                }

                //Attach List<T> to the display control
                ArtistAlbumCountList.DataSource = Artists;
                ArtistAlbumCountList.DataBind();
            }
        }
예제 #4
0
        protected void CountAlbums_Click(object sender, EventArgs e)
        {
            // Note: Only available records are the instances on the grids current page
            List <ArtistAlbumCounts> ArtistList = new List <ArtistAlbumCounts>();

            // Reusable pointer to the instance of the class
            ArtistAlbumCounts item = null;

            // Iterate through each grid row
            int artistID = 0;

            foreach (GridViewRow row in Albums.Rows)
            {
                // Current rows artist ID
                artistID = int.Parse((row.FindControl("Artists") as DropDownList).SelectedValue);

                // Check if the current item is already accounted for
                item = ArtistList.Find(x => x.ArtistId == artistID);

                // Result of check
                if (item == null)
                {
                    // Create instance and add it to the list
                    item            = new ArtistAlbumCounts();
                    item.ArtistId   = artistID;
                    item.AlbumCount = 1;
                    ArtistList.Add(item);
                }
                else
                {
                    item.AlbumCount++;
                }
            }

            // Attach the list to the display control
            ArtistAlbumCountList.DataSource = ArtistList;
            ArtistAlbumCountList.DataBind();
        }