c# - 将图像插入到 Excel 工作表不起作用

Question

我正在尝试将图像插入到 excel 表中，如下所示。

Image img = Image.FromFile("test.jpg");
sheet.get_Range("A1").set_Item(1,1,img);

但是当excel在A1单元格中打开时没有任何图片，
但只有这个结果：System.Drawing.Bitmap
那么问题是什么，我该如何解决。第二个问题是：
如果我的图片位于数据库中，如何插入到 excel 中。我不想将它们保存到计算机以插入到 Excel 中？[WinForm]

Answer 1

Try this:

object missing = System.Reflection.Missing.Value;
Excel.Range picPosition = sheet.get_Range("A1"); // retrieve the range for picture insert
Excel.Pictures p = yourWorksheet.Pictures(missing) as Excel.Pictures;
Excel.Picture pic = null;
pic = p.Insert(yourImageFilePath, missing);
pic.Left = Convert.ToDouble(picRange.Left);
pic.Top = picRange.Top;
pic.Placement = // Can be any of Excel.XlPlacement.XYZ value

Answer 2

    System.Data.SqlClient.SqlDataReader rdr = null;
            System.Data.SqlClient.SqlConnection conn = null;
            System.Data.SqlClient.SqlCommand selcmd = null;
            try
            {
              conn = new System.Data.SqlClient.SqlConnection
            (System.Configuration.ConfigurationManager.ConnectionStrings
            ["ConnectionString"].ConnectionString);
//here set your query to get image from databse
              selcmd = new System.Data.SqlClient.SqlCommand
            ("select pic1 from msg where msgid=" + 
            context.Request.QueryString["imgid"], conn);
              conn.Open();
              rdr = selcmd.ExecuteReader();
              while (rdr.Read())
              {
                byte[] YourImagebytearray = ((byte[])rdr["pic1"]);
                MemoryStream stream = new MemoryStream(bytes);
                var newImage = System.Drawing.Image.FromStream(stream);
                stream.Dispose();
              }
              if (rdr != null)
                rdr.Close();
            }
            finally
            {
              if (conn != null)
                  conn.Close();
            }