/// <summary>
/// DataTable写入数据流
/// </summary>
/// <param name="dt">数据源</param>
/// <param name="stream">数据流</param>
/// <param name="columns">DataTable 中的列及Excel中的标题组成的键值对</param>
/// <param name="sheetName">sheet名称</param>
public static void ExportExcel(Stream stream, DataTable dt, Dictionary <string, string> columns, string sheetName = "Sheet")
{
if (columns == null || columns.Count == 0)
{
throw (new ArgumentNullException("columns", "请设置要导出的列名"));
}
if (dt == null || dt.Rows.Count == 0)
{
throw new ArgumentNullException("dt", "请设置导出的数据");
}
HSSFWorkbook workbook = CreateExcelFile();
workbook.CreateRows(dt.Rows, columns);
workbook.SaveExcelFile(stream);
}