C#.net操作Excel(摘) HA

1.把grid的内容输出成excel

        Response.Clear();
        Response.Buffer = true;
        Response.Charset = "GB2312";
        Response.AppendHeader("Content-Disposition", "attachment;filename=FileName.xls");
        Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");//设置输出流为简体中文
        Response.ContentType = "application/ms-excel";//设置输出文件类型为excel文件。
        this.EnableViewState = false;
        System.Globalization.CultureInfo myCItrad = new System.Globalization.CultureInfo("ZH-CN",true);
        System.IO.StringWriter oStringWriter = new System.IO.StringWriter(myCItrad);
        System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);
        this.DataGrid1.RenderControl(oHtmlTextWriter);
        Response.Write(oStringWriter.ToString());
        Response.End();


2从EXCEL中读取数据

    /// <summary>
    ///
    /// </summary>
    /// <param name="Path"></param>
    /// <returns></returns>
    public DataSet ExcelToDS(string Path, string sheetName)
    {
        //-----------------------------------连接
        strConn = "Provider=Microsoft.Jet.OLEDB.4.0;" +             //提供者
                "Data Source=C:\\Inetpub\\wwwroot\\contacts.xls;" + //路径
                "Extended Properties=Excel 8.0;";                   //扩充属性
        OleDbConnection conn = new OleDbConnection(strConn);        //取得连接
        //-----------------------------------打开
        conn.Open();                                                //打开连接
        //取得EXCEL的所有Sheet信息
        DataTable schemaTable = conn.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Tables, null);
        //取得sheet名Rows[i][2]
        string tableName = schemaTable.Rows[0][2].ToString().Trim();

        string strExcel = "select * from [" + tableName + "$]"; //命令语句
        OleDbDataAdapter myCommand = new OleDbDataAdapter(strExcel, strConn);
        DataSet ds = new DataSet();

        myCommand.Fill(ds, "table1");
        return ds;
    }


3把数据写入EXCEL文件中

    /// <summary>
    /// 写入Excel文件
    /// </summary>
    /// <param name="Path">路径</param>
    /// <param name="oldds">数据源</param>
    public void DSToExcel(string Path, DataSet oldds)
    {
        //先得到汇总EXCEL的DataSet 主要目的是获得EXCEL在DataSet中的结构
        string strCon = " Provider = Microsoft.Jet.OLEDB.4.0 ; Data Source =" + Path + ";Extended Properties=Excel 8.0";
        OleDbConnection myConn = new OleDbConnection(strCon);
        string strCom = "select * from [Sheet1$]";
        myConn.Open();
        OleDbDataAdapter myCommand = new OleDbDataAdapter(strCom, myConn);
        OleDbCommandBuilder builder = new OleDbCommandBuilder(myCommand);
        //QuotePrefix和QuoteSuffix主要是对builder生成InsertComment命令时使用。
        builder.QuotePrefix = "[";     //获取insert语句中保留字符（起始位置）
        builder.QuoteSuffix = "]"; //获取insert语句中保留字符（结束位置）
        DataSet newds = new DataSet();
        myCommand.Fill(newds, "Table1");
        for (int i = 0; i < oldds.Tables[0].Rows.Count; i++)
        {
            // 在这里不能使用ImportRow方法将一行导入到news中，
        //因为ImportRow将保留原来DataRow的所有设置(DataRowState状态不变)。
        //在使用ImportRow后newds内有值，但不能更新到Excel中因为所有导入行的DataRowState!=Added
            DataRow nrow = newds.Tables["Table1"].NewRow();
            for (int j = 0; j < newds.Tables[0].Columns.Count; j++)
            {
                nrow[j] = oldds.Tables[0].Rows[i][j];
            }
            newds.Tables["Table1"].Rows.Add(nrow);
        }
        myCommand.Update(newds, "Table1");
        myConn.Close();
    }