C#实现使用Excel COM组件向Excel文件中添加图片的Demo

需要添加Microsoft.Office.Interop.Excel;及Microsoft.Office.Core;两个命名空间及对应的引用。

比如我Windows 7下装的Office 2007，是添加的是一个COM组件和一个.Net组件的引用，如下图：

而我公司的电脑添加的是Microsoft Excel Object Library 和Microsoft Object Library 。

代码如下：

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Reflection;
using System.IO;
using Microsoft.Office.Interop.Excel;
using Microsoft.Office.Core;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    protected void Button1_Click(object sender, EventArgs e)
    {
        Microsoft.Office.Interop.Excel.Application app = new Application();
        app.Visible = false;
        app.DisplayAlerts = false;

        Workbook workBook = app.Workbooks.Open(Server.MapPath("test_ Excel.xls"),
                            Missing.Value, Missing.Value, Missing.Value,
                            Missing.Value,Missing.Value, Missing.Value, 
                            Missing.Value, Missing.Value,Missing.Value, 
                            Missing.Value, Missing.Value, Missing.Value,
                            Missing.Value, Missing.Value);

        //设置为操作当前workBook的sheet1
        Worksheet workSheet = (Worksheet)workBook.Worksheets[1];

        string imgPath = Server.MapPath("test_Img.jpg");
        byte[] bytesArr = PicToByteArr(imgPath);
        System.Drawing.Image bmp = ReturnPhoto(bytesArr);//图片数据

        int x = 1;
        int y = 1;
        Range rangeTemp = workSheet.get_Range((Range)workSheet.Cells[x, y],
                                              (Range)workSheet.Cells[x, y]);
        //rangeTemp.Select();

        float PicLeft, PicTop;
        PicLeft = Convert.ToSingle(rangeTemp.Left) + 2;
        PicTop = Convert.ToSingle(rangeTemp.Top) + 1;

        workSheet.Shapes.AddPicture(imgPath,
                    Microsoft.Office.Core.MsoTriState.msoFalse,
                    Microsoft.Office.Core.MsoTriState.msoTrue,
                    PicLeft, PicTop, bmp.Width * 8 / 10, bmp.Height * 8 / 10);
        workBook.Save();

        workBook.Close(null, null, null);
        app.Workbooks.Close();
        app.Quit();

        System.Runtime.InteropServices.Marshal.ReleaseComObject(rangeTemp);
        System.Runtime.InteropServices.Marshal.ReleaseComObject(workSheet);
        System.Runtime.InteropServices.Marshal.ReleaseComObject(workBook);
        System.Runtime.InteropServices.Marshal.ReleaseComObject(app);
        System.GC.Collect();
        System.GC.WaitForPendingFinalizers();
    }

    /// <summary>
    /// 将图片转换为字节数组
    /// </summary>
    /// <param name="path">图片的路径</param>
    /// <returns>字节数组</returns>
    public byte[] PicToByteArr(string path)
    {
        FileStream fs = new FileStream(path, FileMode.Open);//将图片写入流中。
        int filelength = 0;
        filelength = (int)fs.Length; //获得文件长度
        Byte[] byteArr = new Byte[filelength]; //建立一个字节数组
        fs.Read(byteArr, 0, filelength); //按字节流读取            
        fs.Close();
        return byteArr;
    }

    /// <summary>
    /// 参数是byte返回图片
    /// </summary>
    /// <param name="byteArr">字节数组</param>
    /// <returns>图片</returns>
    public System.Drawing.Image ReturnPhoto(byte[] byteArr)
    {
        MemoryStream ms = new MemoryStream(byteArr);
        System.Drawing.Image img = System.Drawing.Image.FromStream(ms);
        ms.Close();
        return img;
    }
}