首先：Microsoft.Office.Interop.Excel命名空间要添加什么引用

//这一步我自己做了，但是还是不好使，好使是在更新excel的对.net支持后好的就是下面的图形说明

在visual Studio 2005命令提示工具中，定位到Excel安装目录，运行“TlbImp EXCEL.EXE”命令，把Excel.exe编译为Excel.dll。这一步会在你的机器上面的安装Office的目录下面的 Office11（office2003）目录下生成Excell.dll,所以在引用的时候要到这个目录下面来找Excel.dll。

在项目的引用节点单击右键，在弹出的菜单中单击添加引用...在弹出的对话框中单击COM项，找到Microsoft Excel 11.0 Object Library并单击选中，然后单击选择按钮，如图“引用Excel2003”。从中我们可以看出是引用的Excel.Exe文件，这是 Excel2003版。Excel2000及Excel2002即Excel XP COM项见“Excel版本对照表”。

打开Visual Studio .Net2003命令提示，运行 TlbImp Excel.EXE Interop.Excel.dll

如果是Excel2000，则 TlbImp Excel9.olb Interop.Excel.dll

当 然，第一参数Excel.EXE(Excel9.olb)要指定目录（Office2000安装目录），如果不指定，需要把它拷贝到VS.Net安装路径 下如C:/Visual Studio.Net/SDK/v1.1/Bin；同理，第二参数Interop.Excel.dll是生成的对应的动态库，如果不指定目录，默认生成在 VS.Net安装路径BIN下 ，你可以用你自己喜欢的名字取Interop.Excel.dll，生成之后你就可以在VS.Net开发环境项目中添加对它的引用了。

Tlbimp.exe为类型库导入程序，它将 COM 类型库中的类型定义转换为公共语言运行库程序集中的等效定义，关于它的详细使用参见MSDN。

用第一种方法和第二种方法引用的库和默认文件目录为分别如下：

Excel 2000是

Microsoft Excel 9.0 Object Library

C:/Program Files/Microsoft Office/Office/EXCEL9.OLB

Excel 2002(XP)是

Microsoft Excel 10.0 Object Library

C:/Program Files/Microsoft Office/OFFICE10/EXCEL.EXE

Excel 2003是

Microsoft Excel 11.0 Object Library

C:/Program Files/Microsoft Office/OFFICE11/EXCEL.EXE

方法一：添加dll引用

右击选择你所在的项目的“引用”，选择“添加引用”。

弹出“添加引用”对话框。

选择“COM”选项卡。

选择“Microsoft Excel 11.0 Object Library”

单击“确定”按钮。

代码

public static bool ExportForDataGridview(DataGridView gridView, string fileName, bool isShowExcle)
        {

//建立Ｅｘｃｅｌ对象

Microsoft.Office.Interop.Excel.Application app = new Microsoft.Office.Interop.Excel.Application();
            try
            {
                if (app == null)
                {
                    return false;
                }
               
                app.Visible = isShowExcle;
                Workbooks workbooks = app.Workbooks;
                _Workbook workbook = workbooks.Add(XlWBATemplate.xlWBATWorksheet);
                Sheets sheets = workbook.Worksheets;
                _Worksheet worksheet = (_Worksheet)sheets.get_Item(1);
                if (worksheet == null)
                {
                    return false;
                }
                string sLen = "";
                //取得最后一列列名
                char H = (char)(64 + gridView.ColumnCount / 26);
                char L = (char)(64 + gridView.ColumnCount % 26);
                if (gridView.ColumnCount < 26)
                {
                    sLen = L.ToString();
                }
                else
                {
                    sLen = H.ToString() + L.ToString();
                }

//标题
                string sTmp = sLen + "1";
                Range ranCaption = worksheet.get_Range(sTmp, "A1");
                string[] asCaption = new string[gridView.ColumnCount];
                for (int i = 0; i < gridView.ColumnCount; i++)
                {
                    asCaption[i] = gridView.Columns[i].HeaderText;
                }
                ranCaption.Value2 = asCaption;

//数据
                object[] obj = new object[gridView.Columns.Count];
                for (int r = 0; r < gridView.RowCount - 1; r++)
                {
                    for (int l = 0; l < gridView.Columns.Count; l++)
                    {
                        if (gridView[l, r].ValueType == typeof(DateTime))
                        {
                            obj[l] = gridView[l, r].Value.ToString();
                        }
                        else
                        {
                            obj[l] = gridView[l, r].Value;
                        }
                    }
                    string cell1 = sLen + ((int)(r + 2)).ToString();
                    string cell2 = "A" + ((int)(r + 2)).ToString();
                    Range ran = worksheet.get_Range(cell1, cell2);
                    ran.Value2 = obj;
                }
                //保存
                workbook.SaveCopyAs(fileName);
                workbook.Saved = true;
            }
            finally
            {
                //关闭
                app.UserControl = false;
                app.Quit();
            }
            return true;

}

方法二

用流保存成xls文件. 这种方法比较好,不用引用Excel组件.   下面是具体例子,可以参考

using System.IO;

/// <summary>

/// 另存新档按钮

/// </summary>

private void SaveAs() //另存新档按钮   导出成Excel

{

SaveFileDialog saveFileDialog = new SaveFileDialog();

saveFileDialog.Filter = "Execl files (*.xls)|*.xls";

saveFileDialog.FilterIndex = 0;

saveFileDialog.RestoreDirectory = true;

saveFileDialog.CreatePrompt = true;

saveFileDialog.Title = "Export Excel File To";

saveFileDialog.ShowDialog();

Stream myStream;

myStream = saveFileDialog.OpenFile();

//StreamWriter sw = new StreamWriter(myStream, System.Text.Encoding.GetEncoding("gb2312"));

StreamWriter sw = new StreamWriter(myStream, System.Text.Encoding.GetEncoding(-0));

string str = "";

try

{

//写标题

for (int i = 0; i < dgvAgeWeekSex.ColumnCount; i++)

{

if (i > 0)

{

str += "/t";

}

str += dgvAgeWeekSex.Columns[i].HeaderText;

}

sw.WriteLine(str);

//写内容

for (int j = 0; j < dgvAgeWeekSex.Rows.Count; j++)

{

string tempStr = "";

for (int k = 0; k < dgvAgeWeekSex.Columns.Count; k++)

{

if (k > 0)

{

tempStr += "/t";

}

tempStr += dgvAgeWeekSex.Rows[j].Cells[k].Value.ToString();

}

sw.WriteLine(tempStr);

}

sw.Close();

myStream.Close();

}

catch (Exception e)

{

MessageBox.Show(e.ToString());

}

finally

{

sw.Close();

myStream.Close();

}

}