■ GridSummaryItemCollection 클래스의 BeginUpdate/EndUpdate 메소드를 사용해 과도한 컬렉션 업데이트를 방지하는 방법을 보여준다.
▶ MainForm.cs
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using System; using System.Data.OleDb; using DevExpress.Data; using DevExpress.Utils; using DevExpress.XtraEditors; using DevExpress.XtraGrid; using DevExpress.XtraGrid.Views.Grid; namespace TestProject { /// <summary> /// 메인 폼 /// </summary> public partial class MainForm : XtraForm { //////////////////////////////////////////////////////////////////////////////////////////////////// Field ////////////////////////////////////////////////////////////////////////////////////////// Private #region Field /// <summary> /// 연결 /// </summary> private OleDbConnection connection; #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Constructor ////////////////////////////////////////////////////////////////////////////////////////// Public #region 생성자 - MainForm() /// <summary> /// 생성자 /// </summary> public MainForm() { InitializeComponent(); this.connection = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=nwind.mdb"); this.gridView.InitializeView ( true, // Multi Select GridMultiSelectMode.CellSelect, // Grid Multi Select Mode DrawFocusRectStyle.CellFocus, // Draw Focus Rect Style true, // Show Indicator true, // Show Column Headers true, // Allow Column Moving true, // Allow Column Resizing true, // Allow Filter true, // Allow Sort false, // Allow Cell Merge EditorShowMode.Default, // Editor Show Mode false // Editable ); this.gridView.OptionsBehavior.AutoPopulateColumns = true; this.gridView.OptionsView.ShowFooter = true; this.gridControl.DataSource = Product.GetProductList(this.connection); GridColumnSummaryItem unitPriceSummaryItem = new GridColumnSummaryItem(); unitPriceSummaryItem.FieldName = "UnitPrice"; unitPriceSummaryItem.SummaryType = SummaryItemType.Max; unitPriceSummaryItem.DisplayFormat = "최고액 : {0:c2}"; this.gridView.Columns["UnitPrice"].Summary.Add(unitPriceSummaryItem); this.gridView.BestFitColumns(); this.executeButton.Click += executeButton_Click; } #endregion //////////////////////////////////////////////////////////////////////////////////////////////////// Method ////////////////////////////////////////////////////////////////////////////////////////// Private #region 실행 버튼 클릭시 처리하기 - executeButton_Click(sender, e) /// <summary> /// 실행 버튼 클릭시 처리하기 /// </summary> /// <param name="sender">이벤트 발생자</param> /// <param name="e">이벤트 인자</param> private void executeButton_Click(object sender, EventArgs e) { GridSummaryItemCollection gridSummaryItemCollection = this.gridView.Columns[0].SummaryItem.Collection; try { gridSummaryItemCollection.BeginUpdate(); GridSummaryItem gridSummaryItem = this.gridView.Columns["UnitPrice"].SummaryItem; gridSummaryItem.SummaryType = SummaryItemType.Count; gridSummaryItem.FieldName = "UnitPrice"; gridSummaryItem.DisplayFormat = "건수 : {0:n0}"; } finally { gridSummaryItemCollection.EndUpdate(); } } #endregion } } |
