如何使用OLEDB将DataTable复制到Excel文件？

我正在写一个程序通过使用oledb发送数据到excel。 我用Update语句如下：

OleDbConnection MyConnection = new OleDbConnection(@"provider=Microsoft.Jet.OLEDB.4.0;Data Source='" + GeneralData.excelPath + "';Extended Properties=Excel 8.0;") MyConnection.Open(); OleDbCommand myCommand = new OleDbCommand(); myCommand.Connection = MyConnection; myCommand.CommandType = System.Data.CommandType.Text; string sql = "Update [test$] set press = " + pointsProperties[i].Pressure + ", temp = " + pointsProperties[i].Temperature + " where id= " + id; myCommand.CommandText = sql; myCommand.ExecuteNonQuery(); 

问题是我将使用超过100次的SQL语句，这需要很多时间，所以我认为使用数据表将花费更less的时间，所以我写了一个代码，将数据保存在数据表中，如下所示：

public static System.Data.DataTable ExcelDataTable = new System.Data.DataTable（“Steam Properties”）;

 static System.Data.DataColumn columnID = new System.Data.DataColumn("ID", System.Type.GetType("System.Int32")); static System.Data.DataColumn columnPress = new System.Data.DataColumn("Press", System.Type.GetType("System.Int32")); static System.Data.DataColumn columnTemp = new System.Data.DataColumn("Temp", System.Type.GetType("System.Int32")); public static void IntializeDataTable() // Called one time in MDIParent1.Load() { columnID.DefaultValue = 0; columnPress.DefaultValue = 0; columnTemp.DefaultValue = 0; ExcelDataTable.Columns.Add(columnID); ExcelDataTable.Columns.Add(columnPress); ExcelDataTable.Columns.Add(columnTemp); } public static void setPointInDataTable(StreamProperties Point) { System.Data.DataRow ExcelDataRow = ExcelDataTable.NewRow(); // Must be decleared inside the function // It will raise exception if decleared outside the function ExcelDataRow["ID"] = Point.ID; ExcelDataRow["Press"] = Point.Pressure; ExcelDataRow["Temp"] = Point.Temperature; ExcelDataTable.Rows.Add(ExcelDataRow); } 

问题是我不知道：

1-第二种方法更快吗？

2-如何将数据表复制到Excel文件？

谢谢。

Answer 1

 //Dump the datatable onto the sheet in one operation public void InsertDataTableIntoExcel(Application xlApp, DataTable dt, Reectangle QueryDataArea) { TurnOnOffApplicationSettings(false); using (var rn = xlApp.Range[ColumnNumberToName(QueryDataArea.X) + QueryDataArea.Y + ":" + ColumnNumberToName(QueryDataArea.X + QueryDataArea.Width - 1) + (QueryDataArea.Y + QueryDataArea.Height)].WithComCleanup()) { rn.Resource.Value2 = Populate2DArray(dt); } TurnOnOffApplicationSettings(true); } private object[,] Populate2DArray(DataTable dt) { object[,] values = (object[,])Array.CreateInstance(typeof(object), new int[2] { dt.Rows.Count + 1, dt.Columns.Count + 1}, new int[2] { 1, 1 }); for (int i = 0; i < dt.Rows.Count; i++) { for (int j = 0; j < dt.Columns.Count; j++) { values[i + 1, j + 1] = dt.Rows[i][j] == DBNull.Value ? "" : dt.Rows[i][j]; } } return values; } public static string ColumnNumberToName(Int32 columnNumber) { Int32 dividend = columnNumber; String columnName = String.Empty; Int32 modulo; while (dividend > 0) { modulo = (dividend - 1)%26; columnName = Convert.ToChar(65 + modulo).ToString() + columnName; dividend = (Int32) ((dividend - modulo)/26); } return columnName; } public static Int32 ColumnNameToNumber(String columnName) { if (String.IsNullOrEmpty(columnName)) throw new ArgumentNullException("columnName"); char[] characters = columnName.ToUpperInvariant().ToCharArray(); Int32 sum = 0; for (Int32 i = 0; i < characters.Length; i++) { sum *= 26; sum += (characters[i] - 'A' + 1); } return sum; } private static XlCalculation xlCalculation = XlCalculation.xlCalculationAutomatic; public void TurnOnOffApplicationSettings(Excel.Application xlApp, bool on) { xlApp.ScreenUpdating = on; xlApp.DisplayAlerts = on; if (on) { xlApp.Calculation = xlCalculation; } else { xlCalculation = xlApp.Calculation; xlApp.Calculation = XlCalculation.xlCalculationManual; } xlApp.UserControl = on; xlApp.EnableEvents = on; } 

withComCleanup（）是VSTO Conrtib库。