Excel读取到gridview，然后更新到数据库，怎么实现！
因为Excel里的数据量太大了，谁有好的办法 --------------------编程问答-------------------- 读取数据，显示，然后更新到数据库。如果数据量太大。那么就进行分页显示然后更新。
--------------------编程问答-------------------- 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 --------------------编程问答--------------------
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 --------------------编程问答-------------------- 给你推荐一个 三方DLL 。 （NPOI.dll） 百度去下载下来。
下面是CODE
--------------------编程问答--------------------
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;
}
}
--------------------编程问答--------------------
/// <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
}
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 --------------------编程问答-------------------- xls To DataTable
DataTable to SqlServer
DataTable to gridview
gridview to DataTable --------------------编程问答--------------------
什么意思啊，能给代码吗？ --------------------编程问答-------------------- http://blog.csdn.net/tsiring/article/details/6123147 --------------------编程问答-------------------- 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。
补充：.NET技术 , C#
