using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.IO;
using System.Windows.Forms;
using DevComponents.DotNetBar.SuperGrid;

namespace WCS_Client.UC
{
    public class ExportUtil
    {
        public static string ShowSaveFileDialog()
        {
            try
            {
                //对话框
                SaveFileDialog Sfd = new SaveFileDialog();
                Sfd.Title = "导出数据";
                Sfd.Filter = "EXECL文件(*.xls) |*.xls|EXECL文件(*.xlsx) |*.xlsx|文本文件(*.txt)|*.txt";
                Sfd.FilterIndex = 0;
                if (Sfd.ShowDialog() == DialogResult.OK)
                {
                    return Sfd.FileName;
                }
            }
            catch
            {
            }
            return "";
        }

        public static void Execute(string PathFileName, DataTable dt, List<GridColumn> gcList)
        {
            try
            {
                if (gcList == null || gcList.Count <= 0)
                {
                    return;
                }
                if (dt == null)
                {
                    dt = new DataTable();
                }
                if (!string.IsNullOrEmpty(PathFileName))
                {
                    FileInfo fi = new FileInfo(PathFileName);
                    if (!Directory.Exists(fi.DirectoryName))
                    {
                        Directory.CreateDirectory(fi.DirectoryName);
                    }
                    if (File.Exists(PathFileName))
                    {
                        File.Delete(PathFileName);
                    }
                    FileStream fs = new FileStream(PathFileName, FileMode.Create, FileAccess.Write);
                    if (fi.Extension.ToUpper() == ".XLS" || fi.Extension.ToUpper() == ".XLS")
                    {
                        Export_Excel(fs, dt, gcList);
                    }
                    else if (fi.Extension.ToUpper() == ".TXT")
                    {
                        Export_Txt(fs, dt, gcList);
                    }
                }
            }
            catch
            {

            }
        }

        private static void Export_Excel(FileStream fs, DataTable dt, List<GridColumn> gcList)
        {
            try
            {

                //创建Excel文件的对象
                NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook();
                NPOI.SS.UserModel.ISheet sheet1 = book.CreateSheet("Sheet1"); //添加一个sheet
                int GCCount = gcList.Count;
                NPOI.SS.UserModel.IRow row1 = sheet1.CreateRow(0);
                for (int i = 0; i < GCCount; i++)
                {
                    string ColName = gcList[i].DataPropertyName;
                    if (!dt.Columns.Contains(ColName))
                    {
                        dt.Columns.Add(ColName, typeof(string));
                    }
                    row1.CreateCell(i).SetCellValue(gcList[i].HeaderText);
                }
                int r = 1;
                foreach (DataRow dr in dt.Rows)
                {
                    NPOI.SS.UserModel.IRow erow = sheet1.CreateRow(r);
                    for (int i = 0; i < GCCount; i++)
                    {
                        object o = dr[gcList[i].DataPropertyName];
                        erow.CreateCell(i).SetCellValue(o != null ? o.ToString() : "");
                    }
                    r++;
                }
                book.Write(fs);
                book = null;
            }
            catch
            {

            }
            finally
            {
                if (fs != null)
                {
                    fs.Close();
                    fs.Dispose();
                }
            }
        }

        private static void Export_Txt(FileStream fs, DataTable dt, List<GridColumn> gcList)
        {
            try
            {
                //创建Excel文件的对象
                StreamWriter strwriter = new StreamWriter(fs);
                string s = "";
                bool IsTag = true;
                foreach (GridColumn gc in gcList)
                {
                    string ColName = gc.DataPropertyName;
                    if (!dt.Columns.Contains(ColName))
                    {
                        dt.Columns.Add(ColName, typeof(string));
                    }
                    if (IsTag)
                    {
                        IsTag = false;
                        s = gc.HeaderText;
                    }
                    else
                    {
                        s = s + "," + gc.HeaderText;
                    }
                }
                strwriter.WriteLine(s);
                foreach (DataRow dr in dt.Rows)
                {
                    s = "";
                    IsTag = true;
                    foreach (GridColumn gc in gcList)
                    {
                        object o = dr[gc.DataPropertyName];
                        string k = (o != null ? o.ToString() : "");
                        if (IsTag)
                        {
                            IsTag = false;
                            s = k;
                        }
                        else
                        {
                            s = s + "," + k;
                        }
                    }
                    strwriter.WriteLine(s);
                }
                strwriter.Flush();
                strwriter.Close();
                strwriter.Dispose();
            }
            catch
            {

            }
            finally
            {
                fs.Close();
                fs.Dispose();
            }
        }

    }
}