实际上，您可能想查看C#中可用的互操作类（例如Microsoft.Office.interop.Excel）。您可以说没有OLE（这不是），但互操作类非常容易使用。在这里查看C#文档（Interop for Excel从C#PDF的第1072页开始）。

如果你没有尝试过，你可能会印象深刻。

请注意Microsoft对此的立场：

Microsoft当前不建议也不支持，从任何无人值守、，非交互式客户端应用程序或组件（包括ASP，ASP.NET、DCOM和NT服务），因为Office可能表现出不稳定Office在此环境中运行时的行为和/或死锁。

我找到了另一个没有太多依赖性的库：MiniExcel。

您可以使用DataTables作为电子表格创建数据集（表格的名称是电子表格的名称），并通过以下方式将其保存到.xlsx文件

using var stream = File.Create(filePath);
stream.SaveAs(dataSet);

or

MiniExcel.SaveAs(filePath, dataSet);

它还提供Excel文件的读取，并支持CSV文件的读取和写入。

IKVM+波伊

或者，你可以使用Interop。。。

您可以在Visual Studio上安装OpenXml nuget包。以下是将数据表导出到excel文件的代码：

Imports DocumentFormat.OpenXml
Imports DocumentFormat.OpenXml.Packaging
Imports DocumentFormat.OpenXml.Spreadsheet

Public Class ExportExcelClass
    Public Sub New()

    End Sub

    Public Sub ExportDataTable(ByVal table As DataTable, ByVal exportFile As String)
        ' Create a spreadsheet document by supplying the filepath.
        ' By default, AutoSave = true, Editable = true, and Type = xlsx.
        Dim spreadsheetDocument As SpreadsheetDocument = spreadsheetDocument.Create(exportFile, SpreadsheetDocumentType.Workbook)

        ' Add a WorkbookPart to the document.
        Dim workbook As WorkbookPart = spreadsheetDocument.AddWorkbookPart
        workbook.Workbook = New Workbook

        ' Add a WorksheetPart to the WorkbookPart.
        Dim Worksheet As WorksheetPart = workbook.AddNewPart(Of WorksheetPart)()
        Worksheet.Worksheet = New Worksheet(New SheetData())

        ' Add Sheets to the Workbook.
        Dim sheets As Sheets = spreadsheetDocument.WorkbookPart.Workbook.AppendChild(Of Sheets)(New Sheets())

        Dim data As SheetData = Worksheet.Worksheet.GetFirstChild(Of SheetData)()
        Dim Header As Row = New Row()
        Header.RowIndex = CType(1, UInt32)

        For Each column As DataColumn In table.Columns
            Dim headerCell As Cell = createTextCell(table.Columns.IndexOf(column) + 1, 1, column.ColumnName)
            Header.AppendChild(headerCell)
        Next

        data.AppendChild(Header)

        Dim contentRow As DataRow
        For i As Integer = 0 To table.Rows.Count - 1
            contentRow = table.Rows(i)
            data.AppendChild(createContentRow(contentRow, i + 2))
        Next

    End Sub

    Private Function createTextCell(ByVal columnIndex As Integer, ByVal rowIndex As Integer, ByVal cellValue As Object) As Cell
        Dim cell As Cell = New Cell()
        cell.DataType = CellValues.InlineString

        cell.CellReference = getColumnName(columnIndex) + rowIndex.ToString

        Dim inlineString As InlineString = New InlineString()
        Dim t As Text = New Text()
        t.Text = cellValue.ToString()
        inlineString.AppendChild(t)
        cell.AppendChild(inlineString)
        Return cell
    End Function

    Private Function createContentRow(ByVal dataRow As DataRow, ByVal rowIndex As Integer) As Row
        Dim row As Row = New Row With {
            .rowIndex = CType(rowIndex, UInt32)
        }

        For i As Integer = 0 To dataRow.Table.Columns.Count - 1
            Dim dataCell As Cell = createTextCell(i + 1, rowIndex, dataRow(i))
            row.AppendChild(dataCell)
        Next

        Return row
    End Function

    Private Function getColumnName(ByVal columnIndex As Integer) As String
        Dim dividend As Integer = columnIndex
        Dim columnName As String = String.Empty
        Dim modifier As Integer

        While dividend > 0
            modifier = (dividend - 1) Mod 26
            columnName = Convert.ToChar(65 + modifier).ToString() & columnName
            dividend = CInt(((dividend - modifier) / 26))
        End While

        Return columnName
    End Function
End Class

你可能想看看GemBox.Spresheet。

他们有一个免费版本，具有所有功能，但如果符合您的需要，则限制为每张150行，每张工作簿5页。

我还不需要自己使用它，但看起来很有趣。

检查一下，不需要第三方库，您可以使用以下命令将数据表数据导出到excel文件

var dt = "your code for getting data into datatable";
            Response.ClearContent();
            Response.AddHeader("content-disposition", string.Format("attachment;filename={0}.xls", DateTime.Now.ToString("yyyy-MM-dd")));
            Response.ContentType = "application/vnd.ms-excel";
            string tab = "";
            foreach (DataColumn dataColumn in dt.Columns)
            {
                Response.Write(tab + dataColumn.ColumnName);
                tab = "\t";
            }
            Response.Write("\n");
            int i;
            foreach (DataRow dataRow in dt.Rows)
            {
                tab = "";
                for (i = 0; i < dt.Columns.Count; i++)
                {
                    Response.Write(tab + dataRow[i].ToString());
                    tab = "\t";
                }
                Response.Write("\n");
            }
            Response.End();