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GroupByEvaluator プロパティ

デフォルト以外の GroupBy 比較を実行するために使用するプロパティです。
シンタックス
'宣言
 
Public Property GroupByEvaluator As IGroupByEvaluator
public IGroupByEvaluator GroupByEvaluator {get; set;}
解説

この GroupByEvaluator オブジェクトは、行がグループ行に含まれることを決定するために使用されます。本質的にグループ化行でカスタム ロジックを使用できます。

GroupByEvaluator が論理的に SortComparer と同じであることを保証することに注意します。たとえば、並べ替えの比較子が大文字と小文字を区別しないソートを行う場合、エバリュエータ ロジックによるグループも大文字と小文字を区別しません。グループ化ロジックが、行をソートする方法と同じでないことを求める場合、IGroupByEvaluatorEx インターフェイスを実装する必要があります。IGroupByEvaluatorEx インターフェイスによって、グループ化のために行をソートするロジックを提供できます。詳細は、IGroupByEvaluatorEx インターフェイスを参照してください。

使用例
Imports Infragistics.Shared
Imports Infragistics.Win
Imports Infragistics.Win.UltraWinGrid

  Public Class MyGroupByEvaluator
      Implements Infragistics.Win.UltraWinGrid.IGroupByEvaluator

      Private Function GetGroupByValue(ByVal groupbyRow As UltraGridGroupByRow, ByVal row As UltraGridRow) As Object Implements IGroupByEvaluator.GetGroupByValue

          Dim val As String

          ' Get the default value from the groupbyRow.
          If groupbyRow.Value Is Nothing Then
              val = ""
          Else
              val = groupbyRow.Value.ToString()
          End If

          ' If it is longer than 2 characters truncate it.
          If val.Length > 2 Then
              val = val.Substring(0, 2)
          End If

          ' Convert the string to uppercase for display in the group-by row's description.
          Return val.ToUpper()

      End Function

      Private Function DoesGroupContainRow(ByVal groupbyRow As UltraGridGroupByRow, ByVal row As UltraGridRow) As Boolean Implements IGroupByEvaluator.DoesGroupContainRow

          ' Get the related cell's value as a string.
          Dim cellValue As String = row.Cells(groupbyRow.Column).Value.ToString()

          ' If it is longer than 2 characters truncate it.
          If cellValue.Length > 2 Then
              cellValue = cellValue.Substring(0, 2)
          End If

          ' Do a case insensitive compare.
          Return 0 = String.Compare(groupbyRow.Value.ToString(), cellValue, True)
      End Function

  End Class

  Private Sub Button35_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles button35.Click

      ' Set the view style to OutlookGroupBy to enable the outlook-group-by feature.
      Me.UltraGrid1.DisplayLayout.ViewStyleBand = ViewStyleBand.OutlookGroupBy

      ' Get the CompanyName column.
      Dim column As UltraGridColumn = Me.UltraGrid1.DisplayLayout.Bands(0).Columns("CompanyName")

      ' Set the GroupByEvaluator on the column to an instance of MyGroupByEvaluator.
      column.GroupByEvaluator = New MyGroupByEvaluator()

      ' Set the column's HiddenWhenGroupBy property to false since we are
      ' grouping by the 1st 2 characters of each string we want the full
      ' company name to show in each row.
      column.HiddenWhenGroupBy = DefaultableBoolean.False

      ' Now group the rows by the column.
      Me.UltraGrid1.DisplayLayout.Bands(0).SortedColumns.Add(column, False, True)

  End Sub
using Infragistics.Shared;
using Infragistics.Win;
using Infragistics.Win.UltraWinGrid;
using System.Diagnostics;

public class MyGroupByEvaluator : Infragistics.Win.UltraWinGrid.IGroupByEvaluator
{
	public object GetGroupByValue( UltraGridGroupByRow groupbyRow, UltraGridRow row )
	{

		string val;
		
		// Get the default value from the groupbyRow.
		if (groupbyRow.Value == null )
			val = "";
		else
			val = groupbyRow.Value.ToString();
	
		// If it is longer than 2 characters truncate it.
		if ( val.Length > 2 )
			val = val.Substring( 0, 2 );
	
		// Convert the string to uppercase for display in the group-by row's description.
		return val.ToUpper();

	}
	
	public bool DoesGroupContainRow( UltraGridGroupByRow groupbyRow, UltraGridRow row )
	{

		// Get the related cell's value as a string.
		string cellValue = row.Cells[groupbyRow.Column].Value.ToString();
	
		// If it is longer than 2 characters truncate it.
		if ( cellValue.Length > 2 )
			cellValue = cellValue.Substring(0, 2);
	
		// Do a case insensitive compare.
		return 0 == string.Compare(groupbyRow.Value.ToString(), cellValue, true);
	}

}

private void button35_Click(object sender, System.EventArgs e)
{

	// Set the view style to OutlookGroupBy to enable the outlook-group-by feature.
	this.ultraGrid1.DisplayLayout.ViewStyleBand = ViewStyleBand.OutlookGroupBy;
	
	// Get the CompanyName column.
	UltraGridColumn column = this.ultraGrid1.DisplayLayout.Bands[0].Columns["CompanyName"];
	 
	// Set the GroupByEvaluator on the column to an instance of MyGroupByEvaluator 
	column.GroupByEvaluator = new MyGroupByEvaluator();
	 
	// Set the column's HiddenWhenGroupBy property to false since we are
	// grouping by the 1st 2 characters of each string we want the full
	// company name to show in each row.
	column.HiddenWhenGroupBy = DefaultableBoolean.False;

	// Now group the rows by the column.
	this.ultraGrid1.DisplayLayout.Bands[0].SortedColumns.Add( column, false, true );

}
参照