Excel读取到gridview，然后更新到数据库，怎么实现！

Question

因为Excel里的数据量太大了，谁有好的办法

Answer 1

http://blog.csdn.net/wangtianling/article/details/7651331
则是我写的一个互导数据的代码希望对你有帮助
引用的第三方的插件不需要安装office

Answer 2

这个是导出，能给个导入数据库的吗elx打开到grid（这个已经实现），然后更新到数据库应该怎么写呢，给个代码可以吗

Answer 3

给你推荐一个 三方DLL 。   （NPOI.dll） 百度去下载下来。
下面是CODE 
using System.Data;
using System.IO;
using System.Text;
using NPOI;
using NPOI.HPSF;
using NPOI.HSSF;
using NPOI.HSSF.UserModel;
using NPOI.HSSF.Util;
using NPOI.POIFS;
using NPOI.Util;
using NPOI.SS.UserModel;
using NPOI.SS.Util;
using System.Collections.Generic;
using System.Reflection;
using System.Collections;
using System;
using System.Web;
public class ExcelHelper
{
    /// <summary>
    /// DataTable导出到Excel文件
    /// </summary>
    /// <param name="dtSource">源DataTable</param>
    /// <param name="strHeaderText">表头文本</param>
    /// <param name="strFileName">保存位置</param>
    public static void Export(DataTable dtSource, string strHeaderText, string strFileName, string[] columnNames)
    {
        using (MemoryStream ms = Export(dtSource, strHeaderText, columnNames))
        {
            using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
            {
                byte[] data = ms.ToArray();
                fs.Write(data, 0, data.Length);
                fs.Flush();
            }
        }
    }
    /// <summary>
    /// DataTable导出到Excel的MemoryStream
    /// </summary>
    /// <param name="dtSource">源DataTable</param>
    /// <param name="strHeaderText">表头文本</param>
    /// <param name="columnNames">列名</param>
    public static MemoryStream Export(DataTable dtSource, string strHeaderText, string[] columnNames)
    {
        if (columnNames != null && columnNames.Length != dtSource.Columns.Count)
        {
            throw new ArgumentException("参数不正确:columnNames,数组元素的个数需要和数据源列的数量相同!");
        }
        HSSFWorkbook workbook = new HSSFWorkbook();
        ISheet sheet = workbook.CreateSheet();
        #region 右击文件属性信息
        {
            DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
            dsi.Company = "四川西南交大铁路发展有限公司";
            workbook.DocumentSummaryInformation = dsi;
            SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
            si.Author = "四川西南交大铁路发展有限公司";
            si.ApplicationName = "高速铁路道岔监测系统";
            si.Title = strHeaderText;
            si.CreateDateTime = DateTime.Now;
            workbook.SummaryInformation = si;
        }
        #endregion
        ICellStyle dateStyle = workbook.CreateCellStyle();
        IDataFormat format = workbook.CreateDataFormat();
        dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");
        //取得列宽
        int[] arrColWidth = new int[dtSource.Columns.Count];
        foreach (DataColumn item in dtSource.Columns)
        {
            arrColWidth[item.Ordinal] = Encoding.GetEncoding(936).GetBytes(item.ColumnName.ToString()).Length;
        }
        for (int i = 0; i < dtSource.Rows.Count; i++)
        {
            for (int j = 0; j < dtSource.Columns.Count; j++)
            {
                int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length;
                if (intTemp > arrColWidth[j])
                {
                    arrColWidth[j] = intTemp;
                }
            }
        }
        int rowIndex = 0;
        foreach (DataRow row in dtSource.Rows)
        {
            #region 新建表，填充表头，填充列头，样式
            if (rowIndex == 65535 || rowIndex == 0)
            {
                if (rowIndex != 0)
                {
                    sheet = workbook.CreateSheet();
                }
                #region 表头及样式
                {
                    IRow headerRow = sheet.CreateRow(0);
                    headerRow.HeightInPoints = 25;
                    headerRow.CreateCell(0).SetCellValue(strHeaderText);
                    ICellStyle headStyle = workbook.CreateCellStyle();
                    headStyle.Alignment = HorizontalAlignment.CENTER;
                    IFont font = workbook.CreateFont();
                    font.FontHeightInPoints = 20;
                    font.Boldweight = 700;
                    headStyle.SetFont(font);
                    headerRow.GetCell(0).CellStyle = headStyle;
                    sheet.AddMergedRegion(new CellRangeAddress(0, 0, 0, dtSource.Columns.Count - 1));
                }
                #endregion                #region 列头及样式
                {
                    IRow headerRow = sheet.CreateRow(1);
                    ICellStyle headStyle = workbook.CreateCellStyle();
                    headStyle.Alignment = HorizontalAlignment.CENTER;
                    IFont font = workbook.CreateFont();
                    font.FontHeightInPoints = 10;
                    font.Boldweight = 700;
                    headStyle.SetFont(font);
                    if (columnNames == null)
                    {
                        foreach (DataColumn column in dtSource.Columns)
                        {
                            headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
                            headerRow.GetCell(column.Ordinal).CellStyle = headStyle;
                            //设置列宽
                            sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);
                        }
                    }
                    else
                    {
                        foreach (DataColumn column in dtSource.Columns)
                        {
                            headerRow.CreateCell(column.Ordinal).SetCellValue(columnNames[column.Ordinal]);
                            headerRow.GetCell(column.Ordinal).CellStyle = headStyle;
                            
                            int celllength = 0;
                            if (arrColWidth[column.Ordinal] > 100)
                            {
                                celllength = 100;
                            }
                            else
                            {
                                celllength = arrColWidth[column.Ordinal];
                            }
                            sheet.SetColumnWidth(column.Ordinal, (celllength + 1) * 256);
  
                        }
                    }                }
                #endregion
                rowIndex = 2;
            }
            #endregion            #region 填充内容
            IRow dataRow = sheet.CreateRow(rowIndex);
            foreach (DataColumn column in dtSource.Columns)
            {
                ICell newCell = dataRow.CreateCell(column.Ordinal);
                string drValue = row[column].ToString();
                switch (column.DataType.ToString())
                {
                    case "System.String"://字符串类型
                        newCell.SetCellValue(drValue);
                        break;
                    case "System.DateTime"://日期类型
                        DateTime dateV;
                        DateTime.TryParse(drValue, out dateV);
                        newCell.SetCellValue(dateV);
                        newCell.CellStyle = dateStyle;//格式化显示
                        break;
                    case "System.Boolean"://布尔型
                        bool boolV = false;
                        bool.TryParse(drValue, out boolV);
                        newCell.SetCellValue(boolV);
                        break;
                    case "System.Int16"://整型
                    case "System.Int32":
                    case "System.Int64":
                    case "System.Byte":
                        int intV = 0;
                        int.TryParse(drValue, out intV);
                        newCell.SetCellValue(intV);
                        break;
                    case "System.Decimal"://浮点型
                    case "System.Double":
                        double doubV = 0;
                        double.TryParse(drValue, out doubV);
                        newCell.SetCellValue(doubV);
                        break;
                    case "System.DBNull"://空值处理
                        newCell.SetCellValue("");
                        break;
                    default:
                        newCell.SetCellValue("");
                        break;
                }
            }
            #endregion
            rowIndex++;
        }
        #region 表尾及样式
        {
            IRow tailRow = sheet.CreateRow(rowIndex);
            tailRow.HeightInPoints = 18;
            tailRow.CreateCell(0).SetCellValue("抄送人：xxxxxx  日期:" + DateTime.Now.ToString("yyyy-MM-dd"));
            ICellStyle tailStyle = workbook.CreateCellStyle();
            tailStyle.Alignment = HorizontalAlignment.RIGHT;
            IFont font = workbook.CreateFont();
            font.FontHeightInPoints = 14;
            font.Boldweight = 450;
            tailStyle.SetFont(font);
            tailRow.GetCell(0).CellStyle = tailStyle;
            sheet.AddMergedRegion(new CellRangeAddress(rowIndex , rowIndex , 0, dtSource.Columns.Count - 1));
        }
        #endregion
        using (MemoryStream ms = new MemoryStream())
        {
            
            workbook.Write(ms);
            ms.Flush();
            ms.Position = 0;
            sheet.Dispose();
            //workbook.Dispose();//一般只用写这一个就OK了，他会遍历并释放所有资源，但当前版本有问题所以只释放sheet
            return ms;
        }
    }

Answer 4

 /// <summary>
    /// 用于Web导出
    /// </summary>
    /// <param name="dtSource">源DataTable</param>
    /// <param name="strHeaderText">表头文本</param>
    /// <param name="strFileName">文件名</param>
    public static void ExportByWeb(DataTable dtSource, string strHeaderText, string strFileName, string[] columnNames)
    {
        HttpContext curContext = HttpContext.Current;
        // 设置编码和附件格式
        curContext.Response.ContentType = "application/vnd.ms-excel";
        curContext.Response.ContentEncoding = Encoding.UTF8;
        curContext.Response.Charset = "";
        curContext.Response.AppendHeader("Content-Disposition",
        "attachment;filename=" + HttpUtility.UrlEncode(strFileName, Encoding.UTF8));
        curContext.Response.BinaryWrite(Export(dtSource, strHeaderText, columnNames).GetBuffer());
        curContext.Response.End();
    }
    /// <summary>读取excel
    /// 默认第一行为标头
    /// </summary>
    /// <param name="strFileName">excel文档路径</param>
    /// <returns></returns>
    public static DataTable Import(string strFileName)
    {
        DataTable dt = new DataTable();
        HSSFWorkbook hssfworkbook;
        using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
        {
            hssfworkbook = new HSSFWorkbook(file);
        }
        ISheet sheet = hssfworkbook.GetSheetAt(0);
        System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
        IRow headerRow = sheet.GetRow(0);
        int cellCount = headerRow.LastCellNum;
        for (int j = 0; j < cellCount; j++)
        {
            ICell cell = headerRow.GetCell(j);
            dt.Columns.Add(cell.ToString());
        }
        for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++)
        {
            IRow row = sheet.GetRow(i);
            DataRow dataRow = dt.NewRow();
            for (int j = row.FirstCellNum; j < cellCount; j++)
            {
                if (row.GetCell(j) != null)
                    dataRow[j] = row.GetCell(j).ToString();
            }
            dt.Rows.Add(dataRow);
        }
        return dt;
    }
    #region List泛型集合转换为DataTable
    /// <summary>
    /// 将泛型集合类转换成DataTable
    /// </summary>
    /// <typeparam name="T">集合项类型</typeparam>
    /// <param name="list">集合</param>
    /// <returns>数据集(表)</returns>
    public static DataTable ToDataTable<T>(IList<T> list)
    {
        return ToDataTable<T>(list, null);
    }
    /// <summary>
    /// 将泛型集合类转换成DataTable
    /// </summary>
    /// <typeparam name="T">集合项类型</typeparam>
    /// <param name="list">集合</param>
    /// <param name="propertyName">需要返回的列的列名</param>
    /// <returns>数据集(表)</returns>
    public static DataTable ToDataTable<T>(IList<T> list, params string[] propertyName)
    {
        List<string> propertyNameList = new List<string>();
        if (propertyName != null)
            propertyNameList.AddRange(propertyName);
        DataTable result = new DataTable();
        if (list.Count > 0)
        {
            PropertyInfo[] propertys = list[0].GetType().GetProperties();
            foreach (PropertyInfo pi in propertys)
            {
                if (propertyNameList.Count == 0)
                {
                    var _type = pi.PropertyType;
                    // result.Columns.Add(pi.Name, pi.PropertyType);
                    result.Columns.Add(pi.Name);
                }
                else
                {
                    if (propertyNameList.Contains(pi.Name))
                        // result.Columns.Add(pi.Name, pi.PropertyType);
                        result.Columns.Add(pi.Name);
                }
            }
            for (int i = 0; i < list.Count; i++)
            {
                ArrayList tempList = new ArrayList();
                foreach (PropertyInfo pi in propertys)
                {
                    if (propertyNameList.Count == 0)
                    {
                        object obj = pi.GetValue(list[i], null);
                        if (obj != null)
                        {
                            tempList.Add(obj.ToString().Trim());
                        }
                        else
                        {
                            tempList.Add(obj);
                        }
                    }
                    else
                    {
                        if (propertyNameList.Contains(pi.Name))
                        {
                            object obj = pi.GetValue(list[i], null);
                            if (obj != null)
                            {
                                tempList.Add(obj.ToString().Trim());
                            }
                            else
                            {
                                tempList.Add(obj);
                            }
                        }
                    }
                }
                object[] array = tempList.ToArray();
                result.LoadDataRow(array, true);
            }
        }
        return result;
    }
    #endregion}

Answer 5

elx打开到grid（这个已经实现），然后更新到数据库应该怎么写呢，给个代码可以吗 ，PS.是winform

Answer 6

xls To DataTable
DataTable to SqlServer
DataTable to gridview
gridview to DataTable

Answer 7

http://blog.csdn.net/tsiring/article/details/6123147

Answer 8

更新数据库。 你自己操作 DataTable 就OK 了。 程序要自己动手实践的才行。