重点是把要放Tree的那个单元格所在的列用一个全局变量保存,在事件中好给它赋值

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Windows.Forms;
using Infragistics.Win;
using Infragistics.Win.UltraWinDataSource;
using Infragistics.Win.UltraWinEditors;
using Infragistics.Win.UltraWinGrid;
using Infragistics.Win.UltraWinTree;
using Jurassic.RMSys.Infrastructure.Library;

namespace Jurassic.RMSys.BaseDataManage.VersionAssessment
{
    public partial class VersionManager : Form
    {
        public VersionManager()
        {
            InitializeComponent();
        }

        #region 全量变量
        //用来保存有嵌入树的那一列
        public UltraGridColumn TreeColumn;
        //用来保存嵌入树那一列的UltraTextEditor
        public UltraTextEditor TextEditor;
        //用来保存组织结构的内存表
        public DataTable TbOrganization = ClientDataProvider.Service.SelectSqlCommon("T_Register_Organization");
        #endregion

        //新增一个Grid的空白行，并给予默认值
        private void tsbAdd_Click(object sender, EventArgs e)
        {
            UltraGridRow row = ulgVersion.DisplayLayout.Bands[0].AddNew();
            row.Cells["StartTime"].Value = DateTime.Now;

            row.Cells["UserID"].Value = AppGlobal.UserFullName;
            row.Cells["UserID"].Activation = Activation.NoEdit;

            row.Cells["BaseDay"].Value = DateTime.Now;
            ulgVersion.ActiveRow = row;

            ulgVersion.DisplayLayout.Bands[0].PerformAutoResizeColumns(true, PerformAutoSizeType.VisibleRows);
        }

        //删除选中行
        private void tsbDelete_Click(object sender, EventArgs e)
        {
            if (ulgVersion.ActiveRow != null && MessageBox.Show("确定要删除选定行吗?", "提示",
                MessageBoxButtons.YesNo, MessageBoxIcon.Question, MessageBoxDefaultButton.Button1) == DialogResult.Yes)
            {
                var workID = ulgVersion.ActiveRow.Cells["WorkID"].Value;
                if (workID != null && !String.IsNullOrEmpty(workID + ""))
                {
                    var parameterObject = new List<Tuple<string, string, object>>
                    {
                        new Tuple<string, string, object>("WorkID", "=", workID),
                    };
                    ClientDataProvider.Service.DeleteSqlCommon("T_Work", parameterObject);
                }
                ulgVersion.ActiveRow.Delete(false);
            }
        }

        //确定并选择当前计算的版本
        private void btnOK_Click(object sender, EventArgs e)
        {
            if (ulgVersion.ActiveRow == null)
            {
                MessageBox.Show("请选择要计算的版本!");
                return;
            }

            //创建一个内存表，防止插入计算日期和计算人相同的记录
            var checkInsertTable = new DataTable();
            checkInsertTable.Columns.Add("WorkYear", typeof (DateTime));
            checkInsertTable.Columns.Add("UserID", typeof(string));

            foreach (UltraDataRow row in ultraDataSource1.Rows)
            {
                //var findYearUserID =
                //    checkInsertTable.Select("WorkYear = " + row["WorkYear"] + " and UserID = " + row["UserID"]);
                //if (findYearUserID.Length > 0)
                //{
                //    MessageBox.Show("不能提交日期和计算人相同的两条或两条以上的记录");
                //    LoadGridDataSource();
                //    return;
                //}
                //else
                //{
                //    var newRow = checkInsertTable.NewRow();
                //    newRow["WorkYear"] = row["WorkYear"];
                //    newRow["UserID"] = row["UserID"];
                //    checkInsertTable.Rows.Add(newRow);
                //}
            }

            #region 插入版本记录
            foreach (UltraDataRow row in ultraDataSource1.Rows)
            {
                if (row["WorkID"] + "" == "")
                {
                    var parameterObject = new Dictionary<string, object>();
                    foreach (UltraDataColumn col in
                        row.Band.Columns.Cast<UltraDataColumn>().Where(col => col.Key != "WorkID"))
                    {
                        if (String.IsNullOrEmpty(row[col.Key] + ""))
                        {
                            var headerCaption = ulgVersion.DisplayLayout.Bands[0].Columns[col.Key].Header.Caption;
                            MessageBox.Show("请填写'" + headerCaption + "'再提交!");
                            return;
                        }
                        switch (col.Key)
                        {
                            case "OrganizationID":
                                if (TbOrganization.Rows.Count > 0)
                                {
                                    var findRows = TbOrganization.Select("OrganizationName = '" + row[col.Key] + "'");
                                    if (findRows.Length > 0)
                                    {
                                        parameterObject.Add(col.Key, findRows[0][col.Key]);
                                    }
                                }
                                break;
                            case "UserID":
                                parameterObject.Add(col.Key, AppGlobal.USERID);
                                break;
                            default:
                                {
                                    DateTime ds;
                                    parameterObject.Add(col.Key,
                                        DateTime.TryParse(row[col.Key] + "", out ds) ? ds : row[col.Key]);
                                }
                                break;
                        }
                    }
                    parameterObject.Add("WorkPID", 0);
                    ClientDataProvider.Service.InsertSqlCommon("t_work", parameterObject);
                }
            }
            #endregion

            #region 得到当前选择的评估版本ID
            var workID = ulgVersion.ActiveRow.Cells["WorkID"].Value;
            if (workID != null && !String.IsNullOrEmpty(workID + ""))
            {
                AppGlobal.WorkID = workID + "";
            }
            else
            {
                DateTime ds;
                //反查刚刚插入的数据,得到ID(万一选择的是新增的版本的话)
                var parameterWhere = new List<Tuple<string, string, object>>
                {
                    new Tuple<string, string, object>("WorkYear", "=", 
                        DateTime.TryParse(
                        ulgVersion.ActiveRow.Cells["WorkYear"].Value + "", out ds) ? ds : 
                        ulgVersion.ActiveRow.Cells["WorkYear"].Value),
                    new Tuple<string, string, object>("UserID","=",
                        AppGlobal.USERID)
                };
                var tWorkTable = ClientDataProvider.Service.SelectSqlCommon("T_Work", null, parameterWhere);
                if (tWorkTable.Rows.Count > 0)
                {
                    AppGlobal.WorkID = tWorkTable.Rows[0]["WorkID"] + "";
                }
            }
            #endregion

            //做完所有操作后,关闭窗体
            Close();
        }

        //在Grid初始化事件中给单元格嵌入组织机构树，并注册下拉框事件
        private void ulgVersion_InitializeLayout(object sender, InitializeLayoutEventArgs e)
        {
            var vl = new ValueList();
            vl.AfterDropDownResize += vl_AfterDropDownResize;
            var workTypeTable = ClientDataProvider.Service.SelectSqlCommon("dm_worktype");
            foreach (DataRow loopRow in workTypeTable.Rows)
            {
                vl.ValueListItems.Add(loopRow["WorkTypeID"], loopRow["WorkTypeName"] + "");
            }
            ulgVersion.DisplayLayout.Bands[0].Columns["StartTime"].Style =
                Infragistics.Win.UltraWinGrid.ColumnStyle.Date;
            ulgVersion.DisplayLayout.Bands[0].Columns["BaseDay"].Style = Infragistics.Win.UltraWinGrid.ColumnStyle.Date;
            ulgVersion.DisplayLayout.Bands[0].Columns["WorkYear"].Style = Infragistics.Win.UltraWinGrid.ColumnStyle.Date;

            var treeTarget = new UltraTree();
            #region 生成组织结构树
            var rootRootNode = new UltraTreeNode("rootnode", "中国石油天然气股份有限公司");
            treeTarget.Nodes.Add(rootRootNode);

            if (TbOrganization.Rows.Count > 0)
            {
                foreach (DataRow row in TbOrganization.Rows)
                {
                    if (row["OrganizationPID"] + "" == "0")
                    {
                        var rootNode = new UltraTreeNode(row["OrganizationID"] + "", row["OrganizationName"] + "");
                        rootRootNode.Nodes.Add(rootNode);
                        var findRows = TbOrganization.Select("OrganizationPID = '" + row["OrganizationID"] + "'");
                        if (findRows.Length > 0)
                        {
                            foreach (DataRow childRow in findRows)
                            {
                                //采油厂结点
                                var childNode = new UltraTreeNode(childRow["OrganizationID"] + "",
                                    childRow["OrganizationName"] + "");
                                rootNode.Nodes.Add(childNode);
                            }
                        }
                    }
                }
            }
            #endregion
            treeTarget.ExpandAll();

            #region 把树绑定到Grid的某列的单元格中
            var textEditor = new UltraTextEditor();
            var button = new DropDownEditorButton { Control = treeTarget };

            textEditor.ButtonsRight.Add(button);
            ulgVersion.DisplayLayout.Bands[0].Columns["OrganizationID"].EditorComponent = textEditor;
            #endregion

            //把绑定树这一列赋给一个全局变量
            TreeColumn = ulgVersion.DisplayLayout.Bands[0].Columns["OrganizationID"];
            //注册下拉框事件
            textEditor.AfterEditorButtonCloseUp += textEditor_AfterEditorButtonCloseUp;
            //双击树节点，触发关闭下拉框的事件
            treeTarget.DoubleClick += treeTarget_DoubleClick;

            ulgVersion.DisplayLayout.Bands[0].Columns["WorkTypeID"].Style =
                Infragistics.Win.UltraWinGrid.ColumnStyle.DropDown;
            ulgVersion.DisplayLayout.Bands[0].Columns["WorkTypeID"].ValueList = vl;
            TextEditor = textEditor;
        }

        void vl_AfterDropDownResize(object sender, EventArgs e)
        {
            ulgVersion.DisplayLayout.Bands[0].PerformAutoResizeColumns(true, PerformAutoSizeType.VisibleRows);
        }

        //双击树结点触发下拉框关闭事件,事件触发时把结点的值放到Grid的单元格中
        void treeTarget_DoubleClick(object sender, EventArgs e)
        {
            TextEditor.CloseEditorButtonDropDowns();
        }

        //在下拉框事件中把选中的树节点的值赋给所属单元格
        private void textEditor_AfterEditorButtonCloseUp(object sender, EditorButtonEventArgs e)
        {
            var textEditor = sender as UltraTextEditor;
            var button = e.Button as DropDownEditorButton;
            if (button != null)
            {
                var tree = (UltraTree)button.Control;
                if (tree.ActiveNode != null && textEditor != null)
                {
                    TreeColumn.Layout.ActiveRow.Cells["OrganizationID"].Value = tree.ActiveNode.Text;
                }
            }
            //重新自适应列宽
            ulgVersion.DisplayLayout.Bands[0].PerformAutoResizeColumns(true, PerformAutoSizeType.VisibleRows);
        }

        //窗体加载时，加载评估工作数据到Grid中
        private void VersionManager_Load(object sender, EventArgs e)
        {
            LoadGridDataSource();

            //如果存在版本记录，那么自适列宽，并把单元格设为不可编辑
            if (ultraDataSource1.Rows.Count > 0)
            {
                ulgVersion.DisplayLayout.Bands[0].PerformAutoResizeColumns(true, PerformAutoSizeType.VisibleRows);
                foreach (UltraGridRow row in ulgVersion.Rows)
                    foreach (UltraGridColumn col in ulgVersion.DisplayLayout.Bands[0].Columns)
                        row.Cells[col.Key].Activation = Activation.NoEdit;
            }
        }

        private void LoadGridDataSource()
        {
            //得到"评估工作"表
            var tWorkTable = ClientDataProvider.Service.SelectSqlCommon("T_Work");

            #region 把数据库存查询的DataTable绑定到ultraDataSource

            foreach (DataRow loopRow in tWorkTable.Rows)
            {
                UltraDataRow dr = ultraDataSource1.Rows.Add();
                foreach (var colName in
                    tWorkTable.Columns.Cast<DataColumn>().Select(loopCol =>
                        loopCol.Caption).Where(colName => dr.Band.Columns.Exists(colName)))
                {
                    switch (colName)
                    {
                        case "OrganizationID":
                        {
                            var findRows = TbOrganization.Select("OrganizationID = '" + loopRow[colName] + "'");
                            if (findRows.Length > 0)
                                dr[colName] = findRows[0]["OrganizationName"];
                        }
                            break;
                        case "UserID":
                            dr[colName] = AppGlobal.USERNAME;
                            break;
                        default:
                            dr[colName] = loopRow[colName];
                            break;
                    }
                }
            }
            #endregion
        }
    }
}