UltraWinGrid是包含在infragistics for Windows Forms下的一款强大的表格控件，使用UltraWinGrid可以轻松实现单元格的合并，在很多时候需要自定义一些合并的规则或者逻辑，当符合这种逻辑的单元格进行合并，UltraWinGrid为开发人员提供了IMergedCellEvaluator接口，专门用于自定义单元格合并，具体使用方法请参考下面的事例：

using Infragistics.Win.UltraWinGrid;

public class CustomMergedCellEvaluator: 

        Infragistics.Win.UltraWinGrid.IMergedCellEvaluator

{

        public CustomMergedCellEvaluator()

        {

        }

        public bool ShouldCellsBeMerged(UltraGridRow row1, 

          UltraGridRow row2, UltraGridColumn column)

        {

                // Test to make sure the Type is not DBNull since we allow the ShippedDate to be null

                if (row1.GetCellValue(column).GetType().ToString() != "System.DBNull" && row2.GetCellValue(column).GetType

().ToString() != "System.DBNull")

                {

                        DateTime date1 = (DateTime)row1.GetCellValue(column);

                        DateTime date2 = (DateTime)row2.GetCellValue(column);

                        // Merge cells according to the date portions of the underlying DateTime cell

                        // values, ignoring any time portion. For example, "1/1/2004 10:30 AM" will be

                        //  merged with "1/1/2004 1:15 AM" since the dates are the same.

                        return date1.Date == date2.Date;

                }

                else

                        return false;

        }

}

private void ultraGrid1_InitializeLayout(object sender, Infragistics.Win.UltraWinGrid.InitializeLayoutEventArgs e)

{

        // Set the MergedCellStyle property to enable the merged cell functionality.

        // MergedCellStyle also specifies which columns will merge their cells.

        e.Layout.Override.MergedCellStyle = MergedCellStyle.Always;

        // MergedCellEvaluator property can be used to specify custom logic for

        // merging cells.

        e.Layout.Bands[0].Columns["ShippedDate"].MergedCellEvaluator = new CustomMergedCellEvaluator();

}