How to properly use the SPGridView?

Question

I want to display the SharePoint List Items on the page based on the filter applied.

Managed to get it done with SPGridView however I see that it can be improved.

1. As paging is enabled, it reloads the Items every time.
2. Columns are getting added on page load again and again

any way I could improve this?

public partial class MediaCenterListViewUserControl : UserControl
{
    private MediaCenterListView _webpart = null;

    internal void ConnectWebPart(MediaCenterListView webpart)
    {
        _webpart = webpart;
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        ItemsGridView.AllowPaging = true;
        ItemsGridView.PagerTemplate = null;
        ItemsGridView.PageSize = 10;
        ItemsGridView.PageIndexChanging += new GridViewPageEventHandler(ItemsGridView_PageIndexChanging);

        objectDataSource = new ObjectDataSource(this.GetType().AssemblyQualifiedName, "LoadListItems");
        objectDataSource.ObjectCreating += new ObjectDataSourceObjectEventHandler(objectDataSource_ObjectCreating);
    }

    protected override void OnPreRender(EventArgs e)
    {
        var web = SPContext.Current.Web;
        var spList = web.Lists[_webpart.ListName];

        if (ItemsGridView.Columns.Count == 0)
        {
            ItemsGridView.Columns.Add(new HyperLinkField
            {
                DataTextField = "ID",
                HeaderText = "ID",
                DataNavigateUrlFields = new string[] { "ID" },
                DataNavigateUrlFormatString = string.Format("{0}{1}{2}", web.Url, spList.DefaultEditFormUrl, "?ID={0}"),
                Target = "_blank"
            });
            ItemsGridView.Columns.Add(new SPBoundField { DataField = "LinkFilename", HeaderText = "Name" });
            ItemsGridView.Columns.Add(new SPBoundField { DataField = "ImageCategory", HeaderText = "Image Category" });
        }

        try
        {
            this.BindItems();
        }
        catch (Exception ex)
        {
            SPDiagnosticsService diagnosticsService = SPDiagnosticsService.Local;
            SPDiagnosticsCategory cat = diagnosticsService.Areas["SharePoint Foundation"].Categories["Unknown"];
            diagnosticsService.WriteTrace(1, cat, TraceSeverity.Medium, ex.StackTrace, cat.Name, cat.Area.Name);
        }
    }

    private void BindItems()
    {
        ItemsGridView.DataSource = objectDataSource;
        ItemsGridView.DataBind();
    }

    public DataTable LoadListItems()
    {
        var web = SPContext.Current.Web;
        var spList = web.Lists[_webpart.ListName];
        var spListItems = spList.Items.GetDataTable();

        return spListItems;
    }

    void objectDataSource_ObjectCreating(object sender, ObjectDataSourceEventArgs e)
    {
        e.ObjectInstance = this;
    }

    void ItemsGridView_PageIndexChanging(object sender, GridViewPageEventArgs e)
    {
        ItemsGridView.PageIndex = e.NewPageIndex;
    }
}

Answer 1

You could improve it by getting rid of the SPGridview and going to a client side approach - maybe backed by a custom web service if you need server code. The SPGridview is a server control and is going to require a trip to the server.

I suppose you might be able to use an UpdatePanel, if you really need to use the GridView and have a desire to punish yourself.