操作当前单元格（关键代码就两行）

Range range = (Range)ExSheet.Cells[i + 2, j + 1];                                                 //要添加的单元格位置
sheet.Hyperlinks.Add(range, "http://blog.sina.com.cn/u/2086403861", Missing.Value, Missing.Value, Missing.Value);                       //添加超链接