Question

我使用OpenXML v 2.8.1.0为网站创建Excel报告。电子表格有22列。渲染15,000行需要30秒，但这对于网页来说太长了。我可以更有效地做到这一点吗？

代码段位于下面（省略了与该问题无关的部分）。怀疑我在遍历每个单元格以设置其单元格引用，然后还设置每一行的rowIndex方面的效率低下。

我在打开要填充的电子表格的地方遗漏了代码-它包含标题和示例详细信息行，其中包含我想要的所有格式，但所有值均为空白。

在代码中，我克隆该行，为每个单元格设置值和单元格引用，为该行设置rowIndex，插入该行，然后从数据库中获取下一行数据并重复。

还是每秒500行大约和OpenXML一样快？

谢谢。

public class MyReport
{
    public byte[] Get(List<dbRow> dbRows)
    {
        // dbRows is the result of "Select col0, col1, ... col21 from dbTable"

        // first 6 rows are the report headers
        // row 7 is the blank detail row.
        Row templateDetailRow = sheetData.Elements<Row>().Where(r => r.RowIndex == 7).First();
        // start inserting data rows at row number 8
        uint currentRowPointer = sheetData.Elements<Row>().LastOrDefault().RowIndex + 1; // start adding rows after the current last row
        Row currentBottomRow = sheetData.Elements<Row>().LastOrDefault(); // initialize to last row before we start adding rows

        foreach (dbRow r in dbRows)
        {
            Row newRow = (Row)templateDetailRow.Clone();
            List<Cell> cells = newRow.Elements<Cell>().OrderBy(c => c.CellReference.Value).ToList();
            SetCellsInRow(cells, r, currentRowPointer);
            newRow.RowIndex = currentRowPointer;
            InsertRow(sheetData, newRow);
            currentRowPointer++;
        }

    }
    private void SetCellsInRow(List<Cell> cells, dbRow source, uint rowIndex)
    {
        SetCell(cells[0], source.string0, rowIndex);
        SetCell(cells[1], source.int1, rowIndex);
        SetCell(cells[2], source.string2, rowIndex);
        SetCell(cells[3], source.string3, rowIndex);
        SetCell(cells[4], source.string4, rowIndex);
        SetCell(cells[5], String.Format("{0:MM/dd/yyyy}", source.date5), rowIndex);
        SetCell(cells[6], source.string6, rowIndex);
        SetCell(cells[7], source.int7, rowIndex);
        SetCell(cells[8], source.string8, rowIndex);
        SetCell(cells[9], source.string9, rowIndex);
        SetCell(cells[10], source.date10.ToString("MM/dd/yyyy"), rowIndex);
        SetCell(cells[11], String.Format("{0:MM/dd/yyyy}", source.date11), rowIndex);
        SetCell(cells[12], String.Format("{0:MM/dd/yyyy}", source.date12), rowIndex);
        SetCell(cells[13], source.string13, rowIndex);
        SetCell(cells[14], String.Format("{0:MM/dd/yyyy}", source.date14), rowIndex);
        SetCell(cells[15], source.int15 ?? 0, rowIndex);
        SetCell(cells[16], String.Format("{0:MM/dd/yyyy}", source.date16), rowIndex);
        SetCell(cells[17], source.string17, rowIndex);
        SetCell(cells[18], source.string18, rowIndex);
        SetCell(cells[19], source.int19, rowIndex);
        SetCell(cells[20], source.string20, rowIndex);
        SetCell(cells[21], source.string21, rowIndex);
    }

    private void SetCell(Cell theCell, string val, uint rowIndex)
    {   // a NON-SHARED string is going in to the cell
        theCell.CellValue = new CellValue(val);
        theCell.DataType = new EnumValue<CellValues>(CellValues.String);
        theCell.CellReference = Regex.Replace(theCell.CellReference, @"\d+", rowIndex.ToString());
    }

    private void SetCell(Cell theCell, int val, uint rowIndex)
    {    // an int is going in to the cell
        theCell.CellValue = new CellValue(val.ToString());
        theCell.DataType = new EnumValue<CellValues>(CellValues.Number);
        theCell.CellReference = Regex.Replace(theCell.CellReference, @"\d+", rowIndex.ToString());
    }

    private static void InsertRow(SheetData sheetData, Row row)
    {
        sheetData.InsertAfter(row, currentBottomRow);
        currentBottomRow = row;
    }
}

Answer 1

收到对social.msdn上发布的相同问题的很好回答：

忘记尝试设置rowIndex和CellReference会更快。而是将它们保留为空，并使用AppendChild。这是我改进的代码：

public class MyReport
{
    public byte[] Get(List<dbRow> dbRows)
    {
        // dbRows is the result of "Select col0, col1, ... col21 from dbTable"


        foreach (dbRow r in dbRows)
        {
            Row newRow = new Row();

            SetCell(r.string0, newRow);
            SetCell(r.int1, newRow);
            SetCell(r.string2, newRow);
            SetCell(r.string3, newRow);
            SetCell(r.string4, newRow);
            SetCell(String.Format("{0:MM/dd/yyyy}", r.date5), newRow);
            SetCell(r.string6, rowIndex);
            SetCell(r.int7, rowIndex);
            SetCell(r.string8, rowIndex);
            SetCell(r.string9, rowIndex);
            SetCell(r.date10.ToString("MM/dd/yyyy"), rowIndex);
            SetCell(String.Format("{0:MM/dd/yyyy}", r.date11), rowIndex);
            SetCell(String.Format("{0:MM/dd/yyyy}", r.date12), rowIndex);
            SetCell(r.string13, rowIndex);
            SetCell(String.Format("{0:MM/dd/yyyy}", r.date14), rowIndex);
            SetCell(r.int15 ?? 0, rowIndex);
            SetCell(String.Format("{0:MM/dd/yyyy}", r.date16), rowIndex);
            SetCell(r.string17, rowIndex);
            SetCell(r.string18, rowIndex);
            SetCell(r.int19, rowIndex);
            SetCell(r.string20, rowIndex);
            SetCell(r.string21, rowIndex);

            sheetData.AppendChild(newRow);
        }

        private void SetCell(string val, Row theRow)
        {   // a NON-SHARED string is going in to the cell
            Cell theCell = new Cell();
            theCell.CellValue = new CellValue(val);
            theCell.DataType = new EnumValue<CellValues>(CellValues.String);
            theRow.AppendChild(theCell);
        }

        protected void SetCell(int val, Row theRow)
        {    // an int is going in to the cell
            Cell theCell = new Cell();
            theCell.CellValue = new CellValue(val.ToString());
            theCell.DataType = new EnumValue<CellValues>(CellValues.Number);
            theRow.AppendChild(theCell);
        }
    }
}

将行插入Excel时提高OpenXML性能

1 个答案: