/// <summary>
/// 将图片插入到指定的单元格位置，并设置图片的宽度和高度。
/// 注意：图片必须是绝对物理路径
/// </summary>
/// <param name="objSheet">工作表对象</param>
/// <param name="range">单元格名称，例如：B4</param>
/// <param name="picturePath">要插入图片的绝对路径。</param>
/// <param name="pictureWidth">插入后，图片在Excel中显示的宽度。</param>
/// <param name="pictureHeight">插入后，图片在Excel中显示的高度。</param>
/// <param name="isChangeCellSize">是否按图片尺寸设置单元格大小</param>
/// <param name="offsetX">位置水平位移值</param>
/// <param name="offsetY">位置垂直位移值</param>
public static void InsertPic(Worksheet objSheet, Range range, string picturePath, float pictureWidth, float pictureHeight, bool isChangeCellSize, Single offsetX, Single offsetY)
{object objOpt = System.Reflection.Missing.Value;range.Select();float picLeft,picTop;picLeft = Convert.ToSingle(range.Left) + offsetx;picTop = Convert.ToSingle(range.Top) + offsetY;//Analysis size of pic and make it suit to the cell//封装GDI+位图，此位图由图形图像及其属性的像素数据组成。Bitmap bitmap = new Bitmap(picturePath);float picActualHeight = Convert.ToSingle(bitmap.Size.Height.ToString());float picActualWidth = Convert.ToSingle(bitmap.Size.Width.ToString());float heightScale = picActualHeight / pictureHeight;float widthScale = picActualWidth / pictureWidth;if(heightScale > widthScale) //use the larger scale
    {picActualHeight = pictureHeight - 2;picActualWidth = picActualWidth / heightScale - 2;}else{picActualHeight = picActualHeight / widthScale - 2;picActualWidth = pictureWidth - 2;}bitmap.Dispose();//参数含义：//图片路径//是否链接到文件//图片插入时是否随文档一起保存//图片在文档中的坐标位置（单位：points）//图片显示的宽度和高度（单位：points）
    objSheet.Shapes.AddPicture(picturePath, Microsoft.Office.Core.MsoTriState.msoFalse,  Microsoft.Office.Core.MsoTriState.msoTrue, picLeft, picTop, picActualWidth, picActualHeight);if (isChangeCellSize){range.ColumnWidth = pictureWidth * 0.168;range.RowHeight = pictureHeight;}
}