如何将DataTable导出到Excel

我怎样才能在C＃中的DataTable导出到Excel？ 我正在使用Windows窗体。 DataTable与DataGridView控件关联。 我必须将DataTablelogging导出到Excel。

Answer 1

我会推荐ClosedXML –

你可以用一些非常可读的代码把一个DataTable转换成一个Excel工作表：

 XLWorkbook wb = new XLWorkbook(); DataTable dt = GetDataTableOrWhatever(); wb.Worksheets.Add(dt,"WorksheetName"); 

开发人员响应和帮助。 该项目积极开发，文档精湛。

Answer 2

一个优雅的select是为.net框架的DataTable类写一个扩展方法（见下文）。

这个扩展方法可以被调用如下：

 using System; using System.Collections.Generic; using System.Linq; using Excel = Microsoft.Office.Interop.Excel; using System.Data; using System.Data.OleDb; DataTable dt; // fill table data in dt here ... // export DataTable to excel // save excel file without ever making it visible if filepath is given // don't save excel file, just make it visible if no filepath is given dt.ExportToExcel(ExcelFilePath); 

DataTable类的扩展方法：

 public static class My_DataTable_Extensions { // Export DataTable into an excel file with field names in the header line // - Save excel file without ever making it visible if filepath is given // - Don't save excel file, just make it visible if no filepath is given public static void ExportToExcel(this DataTable tbl, string excelFilePath = null) { try { if (tbl == null || tbl.Columns.Count == 0) throw new Exception("ExportToExcel: Null or empty input table!\n"); // load excel, and create a new workbook var excelApp = new Excel.Application(); excelApp.Workbooks.Add(); // single worksheet Excel._Worksheet workSheet = excelApp.ActiveSheet; // column headings for (var i = 0; i < tbl.Columns.Count; i++) { workSheet.Cells[1, i + 1] = tbl.Columns[i].ColumnName; } // rows for (var i = 0; i < tbl.Rows.Count; i++) { // to do: format datetime values before printing for (var j = 0; j < tbl.Columns.Count; j++) { workSheet.Cells[i + 2, j + 1] = tbl.Rows[i][j]; } } // check file path if (!string.IsNullOrEmpty(excelFilePath)) { try { workSheet.SaveAs(excelFilePath); excelApp.Quit(); MessageBox.Show("Excel file saved!"); } catch (Exception ex) { throw new Exception("ExportToExcel: Excel file could not be saved! Check filepath.\n" + ex.Message); } } else { // no file path is given excelApp.Visible = true; } } catch (Exception ex) { throw new Exception("ExportToExcel: \n" + ex.Message); } } } 

Answer 3

尝试简单的代码，将DataTable转换为Excel文件为csv：

 var lines = new List<string>(); string[] columnNames = dataTable.Columns.Cast<DataColumn>(). Select(column => column.ColumnName). ToArray(); var header = string.Join(",", columnNames); lines.Add(header); var valueLines = dataTable.AsEnumerable() .Select(row => string.Join(",", row.ItemArray)); lines.AddRange(valueLines); File.WriteAllLines("excel.csv",lines); 

这将写入一个新的文件excel.csv到“当前的工作目录”，这通常是.exe的位置或启动它的地方。

请注意，输出将在dataTable中已包含的数据之间放置逗号（ "," ）。 由于它不会在数据中转义逗号，数据中的逗号将被读取该文件的程序误解 。

Answer 4

基于tuncalik的解决scheme（感谢您的想法）的文章，但在大桌子的情况下工作更快（而且不太清楚）。

 public static class My_DataTable_Extensions { /// <summary> /// Export DataTable to Excel file /// </summary> /// <param name="DataTable">Source DataTable</param> /// <param name="ExcelFilePath">Path to result file name</param> public static void ExportToExcel(this System.Data.DataTable DataTable, string ExcelFilePath = null) { try { int ColumnsCount; if (DataTable == null || (ColumnsCount = DataTable.Columns.Count) == 0) throw new Exception("ExportToExcel: Null or empty input table!\n"); // load excel, and create a new workbook Microsoft.Office.Interop.Excel.Application Excel = new Microsoft.Office.Interop.Excel.Application(); Excel.Workbooks.Add(); // single worksheet Microsoft.Office.Interop.Excel._Worksheet Worksheet = Excel.ActiveSheet; object[] Header = new object[ColumnsCount]; // column headings for (int i = 0; i < ColumnsCount; i++) Header[i] = DataTable.Columns[i].ColumnName; Microsoft.Office.Interop.Excel.Range HeaderRange = Worksheet.get_Range((Microsoft.Office.Interop.Excel.Range)(Worksheet.Cells[1, 1]), (Microsoft.Office.Interop.Excel.Range)(Worksheet.Cells[1, ColumnsCount])); HeaderRange.Value = Header; HeaderRange.Interior.Color = System.Drawing.ColorTranslator.ToOle(System.Drawing.Color.LightGray); HeaderRange.Font.Bold = true; // DataCells int RowsCount = DataTable.Rows.Count; object[,] Cells = new object[RowsCount, ColumnsCount]; for (int j = 0; j < RowsCount; j++) for (int i = 0; i < ColumnsCount; i++) Cells[j, i] = DataTable.Rows[j][i]; Worksheet.get_Range((Microsoft.Office.Interop.Excel.Range)(Worksheet.Cells[2, 1]), (Microsoft.Office.Interop.Excel.Range)(Worksheet.Cells[RowsCount + 1, ColumnsCount])).Value = Cells; // check fielpath if (ExcelFilePath != null && ExcelFilePath != "") { try { Worksheet.SaveAs(ExcelFilePath); Excel.Quit(); System.Windows.MessageBox.Show("Excel file saved!"); } catch (Exception ex) { throw new Exception("ExportToExcel: Excel file could not be saved! Check filepath.\n" + ex.Message); } } else // no filepath is given { Excel.Visible = true; } } catch (Exception ex) { throw new Exception("ExportToExcel: \n" + ex.Message); } } } 

Answer 5

试试这个函数传递你想要导出的数据表和文件path

 public void CreateCSVFile(ref DataTable dt, string strFilePath) { try { // Create the CSV file to which grid data will be exported. StreamWriter sw = new StreamWriter(strFilePath, false); // First we will write the headers. //DataTable dt = m_dsProducts.Tables[0]; int iColCount = dt.Columns.Count; for (int i = 0; i < iColCount; i++) { sw.Write(dt.Columns[i]); if (i < iColCount - 1) { sw.Write(","); } } sw.Write(sw.NewLine); // Now write all the rows. foreach (DataRow dr in dt.Rows) { for (int i = 0; i < iColCount; i++) { if (!Convert.IsDBNull(dr[i])) { sw.Write(dr[i].ToString()); } if (i < iColCount - 1) { sw.Write(","); } } sw.Write(sw.NewLine); } sw.Close(); } catch (Exception ex) { throw ex; } } 

Answer 6

最好的和最简单的方法

 private void exportToExcel(DataTable dt) { /*Set up work book, work sheets, and excel application*/ Microsoft.Office.Interop.Excel.Application oexcel = new Microsoft.Office.Interop.Excel.Application(); try { string path = AppDomain.CurrentDomain.BaseDirectory; object misValue = System.Reflection.Missing.Value; Microsoft.Office.Interop.Excel.Workbook obook = oexcel.Workbooks.Add(misValue); Microsoft.Office.Interop.Excel.Worksheet osheet = new Microsoft.Office.Interop.Excel.Worksheet(); // obook.Worksheets.Add(misValue); osheet = (Microsoft.Office.Interop.Excel.Worksheet)obook.Sheets["Sheet1"]; int colIndex = 0; int rowIndex = 1; foreach (DataColumn dc in dt.Columns) { colIndex++; osheet.Cells[1, colIndex] = dc.ColumnName; } foreach (DataRow dr in dt.Rows) { rowIndex++; colIndex = 0; foreach (DataColumn dc in dt.Columns) { colIndex++; osheet.Cells[rowIndex, colIndex] = dr[dc.ColumnName]; } } osheet.Columns.AutoFit(); string filepath = "C:\\Temp\\Book1"; //Release and terminate excel obook.SaveAs(filepath); obook.Close(); oexcel.Quit(); releaseObject(osheet); releaseObject(obook); releaseObject(oexcel); GC.Collect(); } catch (Exception ex) { oexcel.Quit(); log.AddToErrorLog(ex, this.Name); } } 

Answer 7

您可以使用EasyXLS作为导出Excel文件的库。

检查这个代码：

 DataSet ds = new DataSet(); ds.Tables.Add(dataTable); ExcelDocument xls = new ExcelDocument(); xls.easy_WriteXLSFile_FromDataSet("datatable.xls", ds, new ExcelAutoFormat(Styles.AUTOFORMAT_EASYXLS1), "DataTable"); 

另请参阅有关如何在C＃中将数据表导出为ex​​cel的示例。

Answer 8

注意：如果您试图将数据表中的值传递给对象，然后传递给Excel，则还应该执行数据typeserror handling。 例如，Guids会以HRESULT：0x800A03ECexception终止你的任务。 一个解决方法是在填充对象时使用“ToString（）”，而不testing数据types。 Excel将自己将数字转换回数字格式。 FlashTrev解决了相关的date/时间问题。

Answer 9

关于tuncalik的答案，这是很好的，尤其是如果你想有一个小小的游戏代码:)但它是把我的date到美国格式的Excel，即2014年3月2日在英国是02/03/2014但在美国它的03/02/2014与第一个月，然后一个星期之后。 我需要英国的格式，有什么想法吗？

我检查它是存储在我的DataTable的英国格式，也是我的Excel设置为英国，但由于某种原因，当它使Excel文件，它认为它的美国（这是因为微软是美国公司:)

我会尝试与文化代码试验，但不知道在哪里把它。 试过，但这没有效果。

PS

我不得不改变一行来通过添加一个“强制”如下工作

 // single worksheet Excel._Worksheet workSheet = (Excel._Worksheet)excelApp.ActiveSheet; 

更新：通过转换为LongDateTime格式，我已经实现了英国格式的date，但它只是一个工作。

 DateTime startDate = Convert.ToDateTime(myList[0].ToString()); string strStartDate = startDate.ToLongDateString(); DateTime endDate = Convert.ToDateTime(myList[myListTotalRows].ToString()); string strEndDate = endDate.ToLongDateString(); 

干杯。

Answer 10

Excel Interop：

此方法可防止date从dd-mm-yyyy翻转到mm-dd-yyyy

 public bool DataTableToExcelFile(DataTable dt, string targetFile) { const bool dontSave = false; bool success = true; //Exit if there is no rows to export if (dt.Rows.Count == 0) return false; object misValue = System.Reflection.Missing.Value; List<int> dateColIndex = new List<int>(); Excel.Application excelApp = new Excel.Application(); Excel.Workbook excelWorkBook = excelApp.Workbooks.Add(misValue); Excel.Worksheet excelWorkSheet = excelWorkBook.Sheets("sheet1"); //Iterate through the DataTable and populate the Excel work sheet try { for (int i = -1; i <= dt.Rows.Count - 1; i++) { for (int j = 0; j <= dt.Columns.Count - 1; j++) { if (i < 0) { //Take special care with Date columns if (dt.Columns(j).DataType is typeof(DateTime)) { excelWorkSheet.Cells(1, j + 1).EntireColumn.NumberFormat = "d-MMM-yyyy;@"; dateColIndex.Add(j); } //else if ... Feel free to add more Formats else { //Otherwise Format the column as text excelWorkSheet.Cells(1, j + 1).EntireColumn.NumberFormat = "@"; } excelWorkSheet.Cells(1, j + 1) = dt.Columns(j).Caption; } else if (dateColIndex.IndexOf(j) > -1) { excelWorkSheet.Cells(i + 2, j + 1) = Convert.ToDateTime(dt.Rows(i).ItemArray(j)).ToString("d-MMM-yyyy"); } else { excelWorkSheet.Cells(i + 2, j + 1) = dt.Rows(i).ItemArray(j).ToString(); } } } //Add Autofilters to the Excel work sheet excelWorkSheet.Cells.AutoFilter(1, Type.Missing, Excel.XlAutoFilterOperator.xlAnd, Type.Missing, true); //Autofit columns for neatness excelWorkSheet.Columns.AutoFit(); if (File.Exists(exportFile)) File.Delete(exportFile); excelWorkSheet.SaveAs(exportFile); } catch { success = false; } finally { //Do this irrespective of whether there was an exception or not. excelWorkBook.Close(dontSave); excelApp.Quit(); releaseObject(excelWorkSheet); releaseObject(excelWorkBook); releaseObject(excelApp); } return success; } 

如果您不关心正在翻转的date，请使用see链接，该链接显示如何在一行代码中填充Excel电子表格中的所有单元格：

Excel Interop – 效率和性能

CSV：

 public string DataTableToCSV(DataTable dt, bool includeHeader, string rowFilter, string sortFilter, bool useCommaDelimiter = false, bool truncateTimesFromDates = false) { dt.DefaultView.RowFilter = rowFilter; dt.DefaultView.Sort = sortFilter; DataView dv = dt.DefaultView; string csv = DataTableToCSV(dv.ToTable, includeHeader, useCommaDelimiter, truncateTimesFromDates); //reset the Filtering dt.DefaultView.RowFilter = string.Empty; return csv; } public string DataTableToCsv(DataTable dt, bool includeHeader, bool useCommaDelimiter = false, bool truncateTimesFromDates = false) { StringBuilder sb = new StringBuilder(); string delimter = Constants.vbTab; if (useCommaDelimiter) delimter = ","; if (includeHeader) { foreach (DataColumn dc in dt.Columns) { sb.AppendFormat("{0}" + Constants.vbTab, dc.ColumnName); } //remove the last Tab sb.Remove(sb.ToString.Length - 1, 1); sb.Append(Environment.NewLine); } foreach (DataRow dr in dt.Rows) { foreach (DataColumn dc in dt.Columns) { if (Information.IsDate(dr(dc.ColumnName).ToString()) & dr(dc.ColumnName).ToString().Contains(".") == false & truncateTimesFromDates) { sb.AppendFormat("{0}" + delimter, Convert.ToDateTime(dr(dc.ColumnName).ToString()).Date.ToShortDateString()); } else { sb.AppendFormat("{0}" + delimter, CheckDBNull(dr(dc.ColumnName).ToString().Replace(",", ""))); } } //remove the last Tab sb.Remove(sb.ToString.Length - 1, 1); sb.Append(Environment.NewLine); } return sb.ToString; } public enum enumObjectType { StrType = 0, IntType = 1, DblType = 2 } public object CheckDBNull(object obj, enumObjectType ObjectType = enumObjectType.StrType) { object objReturn = null; objReturn = obj; if (ObjectType == enumObjectType.StrType & Information.IsDBNull(obj)) { objReturn = ""; } else if (ObjectType == enumObjectType.IntType & Information.IsDBNull(obj)) { objReturn = 0; } else if (ObjectType == enumObjectType.DblType & Information.IsDBNull(obj)) { objReturn = 0.0; } return objReturn; } 

Answer 11

老线程 – 但我想我会把我的代码在这里。 我写了一个小函数来写一个数据表到指定path（位置）的新Excel表。 此外，你将需要添加一个参考微软的Excel 14.0库。

我从这个线程拉写任何东西 – 如何写一些数据到Excel文件（.xlsx）

我用这个来推断如何写一个数据表

*注意在catch语句中我有一个error handling程序静态类引用（您可以忽略这些）

  using excel = Microsoft.Office.Interop.Excel; using System.IO; using System.Data; using System.Runtime.InteropServices; //class and namespace wrapper is not shown in this example private void WriteToExcel(System.Data.DataTable dt, string location) { //instantiate excel objects (application, workbook, worksheets) excel.Application XlObj = new excel.Application(); XlObj.Visible = false; excel._Workbook WbObj = (excel.Workbook)(XlObj.Workbooks.Add("")); excel._Worksheet WsObj = (excel.Worksheet)WbObj.ActiveSheet; //run through datatable and assign cells to values of datatable try { int row = 1; int col = 1; foreach (DataColumn column in dt.Columns) { //adding columns WsObj.Cells[row, col] = column.ColumnName; col++; } //reset column and row variables col = 1; row++; for (int i = 0; i < dt.Rows.Count; i++) { //adding data foreach (var cell in dt.Rows[i].ItemArray) { WsObj.Cells[row, col] = cell; col++; } col = 1; row++; } WbObj.SaveAs(location); } catch (COMException x) { ErrorHandler.Handle(x); } catch (Exception ex) { ErrorHandler.Handle(ex); } finally { WbObj.Close(); } } 

Answer 12

一种做法是使用ACE OLEDB Provider （另请参阅Excel的连接string ）。 当然，你必须安装和注册提供商。 你应该有，如果你已经安装了Excel，但这是部署应用程序时必须考虑的事情。

这是从ExportHelper调用帮助器方法的ExportHelper ： ExportHelper.CreateXlsFromDataTable(myDataTable, @"C:\tmp\export.xls");

使用ACE OLEDB导出到Excel文件的帮助程序：

 public class ExportHelper { private const string ExcelOleDbConnectionStringTemplate = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=\"Excel 8.0;HDR=YES\";"; /// <summary> /// Creates the Excel file from items in DataTable and writes them to specified output file. /// </summary> public static void CreateXlsFromDataTable(DataTable dataTable, string fullFilePath) { string createTableWithHeaderScript = GenerateCreateTableCommand(dataTable); using (var conn = new OleDbConnection(String.Format(ExcelOleDbConnectionStringTemplate, fullFilePath))) { if (conn.State != ConnectionState.Open) { conn.Open(); } OleDbCommand cmd = new OleDbCommand(createTableWithHeaderScript, conn); cmd.ExecuteNonQuery(); foreach (DataRow dataExportRow in dataTable.Rows) { AddNewRow(conn, dataExportRow); } } } private static void AddNewRow(OleDbConnection conn, DataRow dataRow) { string insertCmd = GenerateInsertRowCommand(dataRow); using (OleDbCommand cmd = new OleDbCommand(insertCmd, conn)) { AddParametersWithValue(cmd, dataRow); cmd.ExecuteNonQuery(); } } /// <summary> /// Generates the insert row command. /// </summary> private static string GenerateInsertRowCommand(DataRow dataRow) { var stringBuilder = new StringBuilder(); var columns = dataRow.Table.Columns.Cast<DataColumn>().ToList(); var columnNamesCommaSeparated = string.Join(",", columns.Select(x => x.Caption)); var questionmarkCommaSeparated = string.Join(",", columns.Select(x => "?")); stringBuilder.AppendFormat("INSERT INTO [{0}] (", dataRow.Table.TableName); stringBuilder.Append(columnNamesCommaSeparated); stringBuilder.Append(") VALUES("); stringBuilder.Append(questionmarkCommaSeparated); stringBuilder.Append(")"); return stringBuilder.ToString(); } /// <summary> /// Adds the parameters with value. /// </summary> private static void AddParametersWithValue(OleDbCommand cmd, DataRow dataRow) { var paramNumber = 1; for (int i = 0; i <= dataRow.Table.Columns.Count - 1; i++) { if (!ReferenceEquals(dataRow.Table.Columns[i].DataType, typeof(int)) && !ReferenceEquals(dataRow.Table.Columns[i].DataType, typeof(decimal))) { cmd.Parameters.AddWithValue("@p" + paramNumber, dataRow[i].ToString().Replace("'", "''")); } else { object value = GetParameterValue(dataRow[i]); OleDbParameter parameter = cmd.Parameters.AddWithValue("@p" + paramNumber, value); if (value is decimal) { parameter.OleDbType = OleDbType.Currency; } } paramNumber = paramNumber + 1; } } /// <summary> /// Gets the formatted value for the OleDbParameter. /// </summary> private static object GetParameterValue(object value) { if (value is string) { return value.ToString().Replace("'", "''"); } return value; } private static string GenerateCreateTableCommand(DataTable tableDefination) { StringBuilder stringBuilder = new StringBuilder(); bool firstcol = true; stringBuilder.AppendFormat("CREATE TABLE [{0}] (", tableDefination.TableName); foreach (DataColumn tableColumn in tableDefination.Columns) { if (!firstcol) { stringBuilder.Append(", "); } firstcol = false; string columnDataType = "CHAR(255)"; switch (tableColumn.DataType.Name) { case "String": columnDataType = "CHAR(255)"; break; case "Int32": columnDataType = "INTEGER"; break; case "Decimal": // Use currency instead of decimal because of bug described at // http://social.msdn.microsoft.com/Forums/vstudio/en-US/5d6248a5-ef00-4f46-be9d-853207656bcc/localization-trouble-with-oledbparameter-and-decimal?forum=csharpgeneral columnDataType = "CURRENCY"; break; } stringBuilder.AppendFormat("{0} {1}", tableColumn.ColumnName, columnDataType); } stringBuilder.Append(")"); return stringBuilder.ToString(); } } 

Answer 13

使用下面的类

 using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Data; using excel = Microsoft.Office.Interop.Excel; using EL = ExcelLibrary.SpreadSheet; using System.Drawing; using System.Collections; using System.Runtime.InteropServices; using System.Windows.Forms; namespace _basic { public class ExcelProcesser { public void WriteToExcel(System.Data.DataTable dt) { excel.Application XlObj = new excel.Application(); XlObj.Visible = false; excel._Workbook WbObj = (excel.Workbook)(XlObj.Workbooks.Add("")); excel._Worksheet WsObj = (excel.Worksheet)WbObj.ActiveSheet; object misValue = System.Reflection.Missing.Value; try { int row = 1; int col = 1; foreach (DataColumn column in dt.Columns) { //adding columns WsObj.Cells[row, col] = column.ColumnName; col++; } //reset column and row variables col = 1; row++; for (int i = 0; i < dt.Rows.Count; i++) { //adding data foreach (var cell in dt.Rows[i].ItemArray) { WsObj.Cells[row, col] = cell; col++; } col = 1; row++; } WbObj.SaveAs(fileFullName, excel.XlFileFormat.xlWorkbookNormal, misValue, misValue, misValue, misValue, excel.XlSaveAsAccessMode.xlExclusive, misValue, misValue, misValue, misValue, misValue); } catch (Exception ex) { MessageBox.Show(ex.Message); } finally { WbObj.Close(true, misValue, misValue); } } } 

}