XAF 如何自定义PivotGrid单元格显示文本？

参考资料：http://www.devexpress.com/Support/Center/p/Q326025.aspx

using System;
using System.Collections.Generic;

using DevExpress.ExpressApp;
using DevExpress.XtraPivotGrid;
using DevExpress.ExpressApp.PivotGrid.Win;
using DevExpress.ExpressApp.Model;

namespace DXExample.Module
{
    public class Q326025Controller : ViewController<ListView>
    {
        private const string PivotGridListEditorKey = "PivotGridListEditor";

        private void Q326025Controller_FieldValueDisplayText(object sender, PivotFieldDisplayTextEventArgs e)
        {
            string displayText = GetDisplayText(e.Field, e.Value);
            if (!string.IsNullOrEmpty(displayText))
            {
                e.DisplayText = displayText;
            }
        }
        private void Q326025Controller_CustomCellDisplayText(object sender, PivotCellDisplayTextEventArgs e)
        {
            string displayText = GetDisplayText(e.DataField, e.Value);
            if (!string.IsNullOrEmpty(displayText))
            {
                e.DisplayText = displayText;
            }
            if(e.Value != null)
            {
                switch (int.Parse(e.Value.ToString()))
                {
                    case -1:
                        e.DisplayText = "正常班";
                        break;
                    case -2:
                        e.DisplayText = "事假";
                        break;
                }
            }
        }

        private PivotGridListEditor PivotGridListEditor
        {
            get { return View.Editor as PivotGridListEditor; }
        }

        protected virtual string GetDisplayText(PivotGridFieldBase field, object value)
        {
            if (field != null && value != null && value.GetType() == typeof(bool))
            {
                IModelMember modelMember = View.Model.ModelClass.FindMember(field.FieldName);
                if (modelMember != null)
                {
                    if ((bool)value)
                    {
                        if (!string.IsNullOrEmpty(modelMember.CaptionForTrue))
                        {
                            return modelMember.CaptionForTrue;
                        }
                    }
                    else
                    {
                        if (!string.IsNullOrEmpty(modelMember.CaptionForFalse))
                        {
                            return modelMember.CaptionForFalse;
                        }
                    }
                }
            }
            return null;
        }
        protected override void OnViewChanging(View view)
        {
            base.OnViewChanging(view);
            Active.RemoveItem(PivotGridListEditorKey);
            if (view is ListView)
            {
                Active[PivotGridListEditorKey] = ((ListView)view).Editor is PivotGridListEditor;
            }
        }
        protected override void OnViewControlsCreated()
        {
            base.OnViewControlsCreated();
            ((PivotGridControl)(PivotGridListEditor.PivotGridControl)).CustomCellDisplayText += new
    PivotCellDisplayTextEventHandler(Q326025Controller_CustomCellDisplayText);
            ((PivotGridControl)(PivotGridListEditor.PivotGridControl)).FieldValueDisplayText += new
    PivotFieldDisplayTextEventHandler(Q326025Controller_FieldValueDisplayText);
        }
        protected override void OnDeactivated()
        {
            ((PivotGridControl)(PivotGridListEditor.PivotGridControl)).CustomCellDisplayText -= new
    PivotCellDisplayTextEventHandler(Q326025Controller_CustomCellDisplayText);
            ((PivotGridControl)(PivotGridListEditor.PivotGridControl)).FieldValueDisplayText -= new
    PivotFieldDisplayTextEventHandler(Q326025Controller_FieldValueDisplayText);
            base.OnDeactivated();
        }
    }

}