Gridview导出Excle（无【xls格式与文件扩展名指定的格式不一致。】提示）
添加一个GvHelper类，使Gridview转为DataTable：
using System;
using System.Collections.Generic;
using System.Text;
using System.Web.UI.WebControls;
using System.Data;
using System.Web.UI;
public class GridViewHelper
{
public static string GetCellText(TableCell cell)
{
string text = cell.Text;
if (!string.IsNullOrEmpty(text))
{
return text;
}
foreach (Control control in cell.Controls)
{
if (control != null && control is ITextControl)
{
LiteralControl lc = control as LiteralControl;
if (lc != null)
{
continue;
}
ITextControl l = control as ITextControl;
text = l.Text.Replace("\r\n", "").Trim();
break;
}
}
return text;
}
/// <summary>
/// 从GridView的数据生成DataTable
/// </summary>
/// <param name="gv">GridView对象</param>
public static DataTable GridView2DataTable(GridView gv)
{
DataTable table = new DataTable();
int rowIndex = 0;
List<string> cols = new List<string>();
if (!gv.ShowHeader && gv.Columns.Count == 0)
{
return table;
}
GridViewRow headerRow = gv.HeaderRow;
int columnCount = headerRow.Cells.Count;
for (int i = 0; i < columnCount; i++)
{
string text = GetCellText(headerRow.Cells[i]);
cols.Add(text);
}
foreach (GridViewRow r in gv.Rows)
{
if (r.RowType == DataControlRowType.DataRow)
{
DataRow row = table.NewRow();
int j = 0;
for (int i = 0; i < columnCount; i++)
{
string text = GetCellText(r.Cells[i]);
if (!String.IsNullOrEmpty(text))
{
if (rowIndex == 0)
{
DataColumn dc = table.Columns.Add();
string columnName = cols[i];
if (String.IsNullOrEmpty(columnName))
{
columnName = gv.Columns[i].HeaderText;
if (string.IsNullOrEmpty(columnName))
{
continue;
}
}
dc.ColumnName = columnName;
dc.DataType = typeof(string);
}
row[j] = text;
}
j++;
}
rowIndex++;
table.Rows.Add(row);
}
}
return table;
}
}
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Web;
using NPOI;
using NPOI.HPSF;
using NPOI.HSSF;
using NPOI.HSSF.UserModel;
using NPOI.POIFS;
using NPOI.Util;
public class ExcleHelper
{
public static Stream RenderDataTableToExcel(DataTable SourceTable)
{
HSSFWorkbook workbook = new HSSFWorkbook();
MemoryStream ms = new MemoryStream();
HSSFSheet sheet =(HSSFSheet) workbook.CreateSheet();
HSSFRow headerRow = (HSSFRow)sheet.CreateRow(0);
foreach (DataColumn column in SourceTable.Columns)
headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
int rowIndex = 1;
foreach (DataRow row in SourceTable.Rows)
{
HSSFRow dataRow = (HSSFRow)sheet.CreateRow(rowIndex);
foreach (DataColumn column in SourceTable.Columns)
{
dataRow.CreateCell(column.Ordinal).SetCellValue(row[column].ToString());
}
rowIndex++;
}
workbook.Write(ms);
ms.Flush();
ms.Position = 0;
sheet = null;
headerRow = null;
workbook = null;
return ms;
}
public static void RenderDataTableToExcel(DataTable SourceTable, string FileName)
{
MemoryStream ms = RenderDataTableToExcel(SourceTable) as MemoryStream;
FileStream fs = new FileStream(FileName, FileMode.Create, FileAccess.Write);
byte[] data = ms.ToArray();
fs.Write(data, 0, data.Length);
fs.Flush();
fs.Close();
data = null;
ms = null;
fs = null;
}
public static DataTable RenderDataTableFromExcel(Stream ExcelFileStream, string SheetName, int HeaderRowIndex)
{
HSSFWorkbook workbook = new HSSFWorkbook(ExcelFileStream);
HSSFSheet sheet = (HSSFSheet)workbook.GetSheet(SheetName);
DataTable table = new DataTable();
HSSFRow headerRow = (HSSFRow)sheet.GetRow(HeaderRowIndex);
int cellCount = headerRow.LastCellNum;
for (int i = headerRow.FirstCellNum; i < cellCount; i++)
{
DataColumn column = new DataColumn(headerRow.GetCell(i).StringCellValue);
table.Columns.Add(column);
}
int rowCount = sheet.LastRowNum;
for (int i = (sheet.FirstRowNum + 1); i < sheet.LastRowNum; i++)
{
HSSFRow row = (HSSFRow)sheet.GetRow(i);
DataRow dataRow = table.NewRow();
for (int j = row.FirstCellNum; j < cellCount; j++)
dataRow[j] = row.GetCell(j).ToString();
}
ExcelFileStream.Close();
workbook = null;
sheet = null;
return table;
}
public static DataTable RenderDataTableFromExcel(Stream ExcelFileStream, int SheetIndex, int HeaderRowIndex)
{
HSSFWorkbook workbook = new HSSFWorkbook(ExcelFileStream);
HSSFSheet sheet = (HSSFSheet)workbook.GetSheetAt(SheetIndex);
DataTable table = new DataTable();
HSSFRow headerRow = (HSSFRow)sheet.GetRow(HeaderRowIndex);
int cellCount = headerRow.LastCellNum;
for (int i = headerRow.FirstCellNum; i < cellCount; i++)
{
DataColumn column = new DataColumn(headerRow.GetCell(i).StringCellValue);
table.Columns.Add(column);
}
int rowCount = sheet.LastRowNum;
for (int i = (sheet.FirstRowNum + 1); i < sheet.LastRowNum; i++)
{
HSSFRow row = (HSSFRow)sheet.GetRow(i);
DataRow dataRow = table.NewRow();
for (int j = row.FirstCellNum; j < cellCount; j++)
{
if (row.GetCell(j) != null)
dataRow[j] = row.GetCell(j).ToString();
}
table.Rows.Add(dataRow);
}
ExcelFileStream.Close();
workbook = null;
sheet = null;
return table;
}
/// <summary>读取excel
/// 默认第一行为标头
/// </summary>
/// <param name="path">excel文档路径</param>
/// <returns></returns>
public static DataTable RenderDataTableFromExcel(string path)
{
DataTable dt = new DataTable();
HSSFWorkbook hssfworkbook;
using (FileStream file = new FileStream(path, FileMode.Open, FileAccess.Read))
{
hssfworkbook = new HSSFWorkbook(file);
}
HSSFSheet sheet = (HSSFSheet)hssfworkbook.GetSheetAt(0);
System.Collections.IEnumerator rows = sheet.GetRowEnumerator();
HSSFRow headerRow = (HSSFRow)sheet.GetRow(0);
int cellCount = headerRow.LastCellNum;
for (int j = 0; j < cellCount; j++)
{
HSSFCell cell = (HSSFCell)headerRow.GetCell(j);
dt.Columns.Add(cell.ToString());
}
for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++)
{
HSSFRow row = (HSSFRow)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;
}
}
protected void Button1_Click(object sender, EventArgs e)
{
MemoryStream ms = new MemoryStream();
dt = GridViewHelper.GridView2DataTable(GridView1); //Gridview转DataTable。
ms = (MemoryStream)ExcleHelper.RenderDataTableToExcel(dt); //DataTable 转 Excle正常格式。
//导出Excle。
Response.AddHeader("Content-Disposition", string.Format("attachment;filename=EmptyWorkbook.xls"));
Response.BinaryWrite(ms.ToArray());
//Export("application/ms-excel", "商品信息表.xls");
}