如何使用EPPlus从Excel文件（xlsx）获取/读取图片
问题描述：
假设我有一个名为 sheet1 的工作表，其中包含名为 pic_001 的图片。 System.Drawing.Image 对象。
Let's assume I have a worksheet named sheet1 which contain a picture named pic_001 How can I get this picture as System.Drawing.Image object.
答
好，我知道了到：
public static Image GetImage(string sheetname, ExcelPackage excelFile)
{
var sheet = excelFile.Workbook.Worksheets[sheetname];
var pic = sheet.Drawings["pic_001"] as ExcelPicture;
return pic.Image;
}