第522篇--DataTable to Excel C#

The code is quite simpke, just have a look.

Add reference to the following dlls:

Interop.Microsoft.Office.Core.dll
Interop.Microsoft.Office.Interop.Excel.dll

Download dlls: https://skydrive.live.com/#cid=6B286CBEF1610557&id=6B286CBEF1610557!677

class Program
    {
        static void Main(string[] args)
        {
            System.Data.DataTable table = new System.Data.DataTable();
            DataColumn column1 = new DataColumn() { ColumnName="Column1"};
            DataColumn column2 = new DataColumn() { ColumnName = "Column2" };

            table.Columns.Add(column1);
            table.Columns.Add(column2);
            table.Rows.Add("1","2");
            table.Rows.Add("3", "4");
            DataTabletoExcel(table, @"C:\temp.XLS");

        }
        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;
            Application xlApp = new ApplicationClass();
            xlApp.DefaultFilePath = "";
            xlApp.DisplayAlerts = true;
            xlApp.SheetsInNewWorkbook = 1;
            Workbook xlBook = xlApp.Workbooks.Add(true);
            //將DataTable的列名導入Excel表第一行
            foreach (DataColumn dc in tmpDataTable.Columns)
            {
                columnIndex++;
                xlApp.Cells[rowIndex, columnIndex] = dc.ColumnName;
            }
            //將DataTable中的數據導入Excel中
            for (int i = 0; i < rowNum; i++)
            {
                rowIndex++;
                columnIndex = 0;
                for (int j = 0; j < columnNum; j++)
                {
                    columnIndex++;
                    xlApp.Cells[rowIndex, columnIndex] = tmpDataTable.Rows[i][j].ToString();
                }
            }
            //xlBook.SaveCopyAs(HttpUtility.UrlDecode(strFileName, System.Text.Encoding.UTF8));
            xlBook.SaveCopyAs(strFileName);
        }
    }

 

Excel to Data:

 private static  System.Data.DataTable ExportFromExcelToDataTable()
        {
            System.Data.DataTable excelDataTable = new System.Data.DataTable();
            string excelConnectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + filePath + ";Extended Properties=Excel 12.0";
            // Create Connection to Excel Workbook
            using (System.Data.OleDb.OleDbConnection excelConnection =
                  new System.Data.OleDb.OleDbConnection(excelConnectionString))
            {
                excelConnection.Open();
                System.Data.DataTable dt = excelConnection.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Tables, null);
                string[] excelSheet = new String[dt.Rows.Count];
                int sheet = 0;
                foreach (DataRow row in dt.Rows)
                {
                    excelSheet[sheet] = row["Table_Name"].ToString();
                    sheet++;

                }
                excelDataTable.Clear();
                for (int i = 0; i < excelSheet.Length; i++)
                {
                    System.Data.OleDb.OleDbCommand command = new System.Data.OleDb.OleDbCommand
                         ("Select  * FROM [" + excelSheet[i] + "]", excelConnection);
                    System.Data.OleDb.OleDbDataAdapter excelAdapter = new System.Data.OleDb.OleDbDataAdapter();
                    excelAdapter.SelectCommand = command;
                    excelAdapter.Fill(excelDataTable);
                }
                excelConnection.Close();
            }

            return excelDataTable;
        }