asp.net(C#)excel导入导出类

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public class HExcel
{
    #region 导入表格
    /// <summary>
    /// 读取Excel文件,内容存储在DataSet中
    /// </summary>
    /// <param name="fileName">文件路径</param>
    /// <param name="sSelect">选择语句{"A:F"表示选择A到F列,包含A,F列, "A1:B2"表示选择A1到B2范围,包括A1,B2}</param>
    /// <param name="bTitle">是否将第一行作为标题行,如果是则可以采用 dr["天津"] 的形式读取数据,否则采取dr[0]的形式</param>
    /// <returns></returns>
    public static DataTable ToDataSet(string fileName, string sSelect, bool bTitle)
    {
        //HDR=Yes,这代表第一行是标题,不做为数据使用 ,如果用HDR=NO,则表示第一行不是标题,做为数据来使用。系统默认的是YES
        //IMEX有3个值:当IMEX=2 时,EXCEL文档中同时含有字符型和数字型时,比如第C列有3个值,2个为数值型 123,1个为字符型 ABC,当导入时,
        //页面不报错了,但库里只显示数值型的123,而字符型的ABC则呈现为空值。当IMEX=1时,无上述情况发生,库里可正确呈现 123 和 ABC.
        string strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + fileName + ";Extended Properties=\"Excel 8.0;HDR=" + (bTitle ? "YES" : "NO") + ";IMEX=1\"";
        var conn = new OleDbConnection(strConn);
        string strExcel = string.Format(@"select * from [sheet1${0}]", sSelect);
        var ds = new DataSet();
        try
        {
            conn.Open();
            var xlsCommand = new OleDbDataAdapter(strExcel, strConn);
            xlsCommand.Fill(ds, "sheet1$");
        }
        catch (Exception)
        {
            return null;
        }
        finally
        {
            conn.Close();
            conn.Dispose();
        }
        if (ds.Tables.Count > 0 && ds.Tables[0].Rows != null && ds.Tables[0].Rows.Count > 0)
            return ds.Tables[0];
        return null;
    }
    #endregion
    #region ExportToExcel:导出excel
    /// <summary>
    /// 将DataTable转成Excel[Table]字符串. 可用于直接输出.
    /// </summary>
    /// <param name="dt">传入的DataTable数据, 必须提供标题!</param>
    /// <returns></returns>
    public static string DTToExcelStr(DataTable dt)
    {
        string newLine = "<table cellspacing=\"1\" border=\"1\">";
        newLine += "<tr><td colspan=\"" + dt.Columns.Count + "\" align=\"center\">" + dt.TableName + "</td></tr>";
        newLine += "<tr>";
        for (int i = 0; i < dt.Columns.Count; i++)
        {
            newLine += "<td>" + dt.Columns[i].Caption + "</td>";
        }
        newLine += "</tr>";
        for (int j = 0; j < dt.Rows.Count; j++)
        {
            newLine += "<tr>";
 
            for (int i = 0; i < dt.Columns.Count; i++)
            {
                newLine += "<td>" + dt.Rows[j][i] + "</td>";
            }
            newLine += "</tr>";
        }
        newLine += "</table>";
        return newLine;
    }
 
    /// <summary>
    /// 将DataTable导出到excel文件
    /// </summary>
    /// <param name="dt">DataTable数据源</param>
    /// <param name="sFilePath">Excel文件路径</param>
    /// <returns></returns>
    public static bool DTToExcelFile(DataTable dt, string sFilePath)
    {
        return HFile.Write(sFilePath, DTToExcelStr(dt));
    }
 
 
    #endregion
}
posted @   hen  阅读(3309)  评论(0编辑  收藏  举报





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