using System;
using System.Data;
using System.Reflection;
using Microsoft.Office.Interop.Excel;

namespace SSWMS.Common
{
    public class ExcelUtils
    {
        public static void ExportDataTable(System.Data.DataTable dt)
        {
            Application application = new Application();
            _Worksheet ws = (_Worksheet)application.Workbooks.Add(Missing.Value).Worksheets[1];
            ws.Name = "导出";
            ws.Cells[1, 1] = "导出日期";
            ws.Cells[1, 2] = StringUtils.GetCurrentDay();
            int iColumn = 1;
            foreach (DataColumn dc in dt.Columns)
            {
                ws.Cells[2, iColumn] = dc.ColumnName;
                ++iColumn;
            }
            string[,] asData = new string[dt.Rows.Count, dt.Columns.Count];
            for (int iRow = 0; iRow < dt.Rows.Count; ++iRow)
            {
                for (iColumn = 0; iColumn < dt.Columns.Count; ++iColumn)
                {
                    asData[iRow, iColumn] = dt.Rows[iRow][iColumn].ToString();
                }
            }
            ws.get_Range("A3", Missing.Value).get_Resize(dt.Rows.Count, dt.Columns.Count).set_Value(Missing.Value, asData);
            application.Visible = true;
        }

        public static bool ImportExcel(string sFileName, out string sResult)
        {
            bool bResult = true;
            sResult = string.Empty;
            try
            {
                Application application = new Application();
                Workbook workbook = application.Application.Workbooks.Open(sFileName, Missing.Value, true);
                Worksheet worksheet = (Worksheet)workbook.Worksheets.get_Item(1);
                int iRows = worksheet.UsedRange.Row + worksheet.UsedRange.Rows.Count - 1;
                Range range = worksheet.Cells.get_Range("A1", "C" + iRows.ToString());
                object[,] value2 = (object[,])range.Value2;
                for (int iRow = 1; iRow <= iRows; ++iRow)
                {
                    string A = value2[iRow, 1] == null ? string.Empty : value2[iRow, 1].ToString();
                    string B = value2[iRow, 2] == null ? string.Empty : value2[iRow, 2].ToString();
                }
            }
            catch (Exception ex)
            {
                sResult = ex.Message;
                bResult = false;
            }
            return bResult;
        }
    }
}