层级结构SPList导出到Excel

using System;

using Microsoft.SharePoint;

using Microsoft.SharePoint.WebControls;

using Microsoft.Office.Interop.Excel;

using System.Data;

using System.Web;



namespace NuctechProject.Layouts.Settings

{

    public partial class ToExcel : LayoutsPageBase

    {

        private static readonly string _rootUrl = HttpContext .Current.Request.Url.Scheme + "://" +

                                                  HttpContext.Current.Request.Url.Host;



        private static readonly string weburl = _rootUrl + "/" ;

        private readonly string StrUrl = weburl + "newTemplate/"; //公告站点地址

        protected void Page_Load(object sender, EventArgs e)

        {

            SPSecurity.RunWithElevatedPrivileges(delegate

            {

                using (var site = new SPSite(StrUrl))

                {

                    using (SPWeb web = site.OpenWeb())

                    {

                        //构建DataTable，规则为第一个为任务名，最后一个为层级

                        var dt = new System.Data.DataTable();

                        dt.Columns.Add( "里程碑" , typeof( string));

                        dt.Columns.Add( "责任人" , typeof( string));

                        dt.Columns.Add( "任务状态" , typeof( string));

                        dt.Columns.Add( "ceng", typeof (string)); //不用更改，不显示，需放在最后

                        SPList spList = web.Lists["TastTemp" ];

                        dt = GetDataTable(0, spList, dt, 1);

                        DataTabletoExcel(dt, @"C:\Users\Administrator\Desktop\strTemplateFileName.xlsx" );

                    }

                }

                ;

            });

        }

        public static void DataTabletoExcel(System.Data. DataTable tmpDataTable, string strFileName)

        {

            if (tmpDataTable == null )

                return;

            int rowNum = tmpDataTable.Rows.Count;

            int columnNum = tmpDataTable.Columns.Count;

            int rowIndex = 1;

            int columnIndex = 0;

            int cengMax = 0;

            cengMax = Convert.ToInt32(tmpDataTable.Compute("max(ceng)" , ""));

            int cengValue = cengMax - 1;

            Microsoft.Office.Interop.Excel. Application xlApp = new Microsoft.Office.Interop.Excel.Application();

            xlApp.DefaultFilePath = "";

            xlApp.DisplayAlerts = true;

            xlApp.SheetsInNewWorkbook = 1;

            Workbook xlBook = xlApp.Workbooks.Add(true );

            //导入列名

            for (int i = 0; i < (columnNum + cengValue); i++)

            {

                if (i == 1)

                {

                    xlApp.Cells[1, i] = tmpDataTable.Columns[i - 1].ColumnName;

                }

                if (i <= cengMax && i > 1)

                {

                    xlApp.Cells[1, i] = GetCapital(i - 1) + "级任务" ;

                }

                if (i > cengMax)

                {

                    xlApp.Cells[1, i] = tmpDataTable.Columns[(i - cengMax)].ColumnName;

                }

            }

            //将DataTable中的数据导入Excel中

            for (int i = 0; i < rowNum; i++)

            {

                rowIndex++;

                columnIndex = 0;

                for (int j = 0; j < (columnNum - 1); j++)

                {

                    if (j < 1)

                    {

                        int ceng = Convert .ToInt16(tmpDataTable.Rows[i][columnNum - 1].ToString());

                        xlApp.Cells[i + 2, ceng] = tmpDataTable.Rows[i][j].ToString();

                    }

                    if (j >= 1)

                    {

                        xlApp.Cells[i + 2, j + cengMax] = tmpDataTable.Rows[i][j].ToString();

                    }

                    columnIndex++;

                }

            }

            xlApp.get_Range((Microsoft.Office.Interop.Excel. Range)xlApp.Cells[1, 1], (Microsoft.Office.Interop.Excel.Range )xlApp.Cells[1, Convert.ToInt16(columnNum + cengValue - 1)]).Interior.ColorIndex = 16;

            xlApp.get_Range((Microsoft.Office.Interop.Excel. Range)xlApp.Cells[1, 1], (Microsoft.Office.Interop.Excel.Range )xlApp.Cells[10000, 100]).EntireColumn.AutoFit();//列宽自适应

            xlBook.SaveCopyAs(strFileName);

        }



        /// <summary>

        /// 获取一个任务的子任务

        /// </summary>

        /// <param name="item"></param>

        /// <param name="parentKey"></param>

        /// <param name="list"></param>

        /// <returns></returns>

        public static System.Data.DataTable GetDataTable( int parentId, SPList list, System.Data.DataTable dt, int ceng)

        {

            SPQuery query = new SPQuery();

            query.Query = @"<Where>

                          <Eq>

                             <FieldRef Name='PID' />

                             <Value Type='Number'>" + parentId.ToString() + @"</Value>

                          </Eq>

                       </Where>" ;

            SPListItemCollection items = list.GetItems(query);

            foreach (SPListItem item in items)

            {

                string taskName = item["TaskName" ].ToString();

                string assignedTo = item["AssignedTo" ].ToString().Substring(item["AssignedTo"].ToString().LastIndexOf( "#") + 1);

                string status = item["Status" ].ToString();

                dt.Rows.Add(taskName, assignedTo, status, ceng.ToString());

                dt = GetDataTable(item.ID, list, dt, ceng + 1);

            }

            return dt;

        }

        public static string GetCapital( int number)

        {

            switch (number)

            {

                case 1:

                    return "一" ;

                case 2:

                    return "二" ;

                case 3:

                    return "三" ;

                case 4:

                    return "四" ;

                case 5:

                    return "五" ;

            }

            return "更多" ;

        }

    }





}