1. 使用Open XML SDK读取Excel
   

using (SpreadsheetDocument myDoc = SpreadsheetDocument.Open(stream, false))
            {
                WorkbookPart workbookPart = myDoc.WorkbookPart;
                foreach (var worksheetPart in workbookPart.WorksheetParts)
                {
                    //所有超链接hyperlink数据表
                    var hyperlinks = worksheetPart.RootElement.Descendants<Hyperlinks>().First().Cast<Hyperlink>();
                    var sheet = worksheetPart.Worksheet.Elements<SheetData>().First();

                    foreach (Row r in sheet.Elements<Row>())
                    {
                        var cell = (Cell)r.ElementAtOrDefault(1);

                        //举例获取一个单元格
                        cell = (Cell)r.ElementAt(1);
                        //通过单元格列头信息获取超链接
                        var hyperlink = hyperlinks.SingleOrDefault(i => i.Reference.Value == cell.CellReference.Value);
                        
                        if (hyperlink != null)
                        {
                            var hyperlinksRelation = worksheetPart.HyperlinkRelationships.SingleOrDefault(i => i.Id == hyperlink.Id);
                            if (hyperlinksRelation != null)
                            {
                                //这是最终我们需要的超链接
                                var url = hyperlinksRelation.Uri.ToString();
                            }
                        }
                    }
                }
            }