将锯齿状数组直接转换为2D数组，而无需迭代每个项目？

Question

我正在尝试将DataTable保存到Excel工作表中。我的代码是这样的。

Excel.Range range = xlWorkSheet.get_Range("A2");
range = range.get_Resize(dtExcel.Rows.Count, dtExcel.Columns.Count);
object[,] rng1 = new object[dtExcel.Rows.Count, dtExcel.Columns.Count];

Excel范围要求范围值作为array [，]，但我将DataTable作为锯齿状的array [] []。

object[][] rng2 = dtExcel.AsEnumerable().Select(x => x.ItemArray).ToArray();

Is there any built-in function to directly convert the jagged array[][] to a 2D array[][] ? Iterating through Excel, DataTable and assigning seems slower with bulk data..

Also I don't want to setup querying with DSN for excel.. I chose excel storage to avoid the configuring of any databases.. :P I found a detailed explanation of ways of writing data to excel here.. http://support.microsoft.com/kb/306023

Answer 1

最后我为此使用了NPOI 库。它非常简单且免费。

将DataTable转换为excel的代码如下。

HSSFWorkbook hssfworkbook = new HSSFWorkbook();
        foreach (DataTable dt in DataSource.Tables)
        {
            ISheet sheet1 = hssfworkbook.CreateSheet(dt.TableName);

            //Set column titles
            IRow headRow = sheet1.CreateRow(0); 
            for (int colNum = 0; colNum < dt.Columns.Count; colNum++)
            {
                ICell cell = headRow.CreateCell(colNum);
                cell.SetCellValue(dt.Columns[colNum].ColumnName);
            }

            //Set values in cells
            for (int rowNum = 1; rowNum <= dt.Rows.Count; rowNum++)
            {
                IRow row = sheet1.CreateRow(rowNum);
                for (int colNum = 0; colNum < dt.Columns.Count; colNum++)
                {
                    ICell cell = row.CreateCell(colNum);
                    cell.SetCellValue(dt.Rows[rowNum - 1][colNum].ToString());
                }
            }

            // Resize column width to show all data
            for (int colNum = 0; colNum < dt.Columns.Count; colNum++)
            {
                sheet1.AutoSizeColumn(colNum);
            }
        }