C#將DataTable的數據導出到Excel
夏兴平
將DataTable的數據導出到Excel
可自動生成多張Sheet
NPOI可不依賴Excel客戶端
using System;
using System.IO;
using System.Data;
using NPOI.SS.UserModel;
using NPOI.HSSF.UserModel;
using NPOI.XSSF.UserModel;
using System.Configuration;
using System.Text;
using NPOI.HPSF;
namespace WindowsFormsApp1.Common
{
class ExcelHelper
{
/// <summary>
///保存文件XLS(多sheet)
/// </summary>
/// <param name="dt"></param>
/// <param name="file"></param>
public static string TableToExcelForXLSHead(DataTable dt, string file)
{
try
{
HSSFWorkbook workbook = new HSSFWorkbook();
ISheet sheet = workbook.CreateSheet();
#region 右擊檔案 屬性資訊
{
DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
dsi.Company = "NPOI";
workbook.DocumentSummaryInformation = dsi;
SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
si.Author = "檔案作者資訊"; //填加xls檔案作者資訊
si.ApplicationName = "建立程式資訊"; //填加xls檔案建立程式資訊
si.LastAuthor = "最後儲存者資訊"; //填加xls檔案最後儲存者資訊
si.Comments = "作者資訊"; //填加xls檔案作者資訊
si.Title = "標題資訊"; //填加xls檔案標題資訊
si.Subject = "主題資訊";//填加檔案主題資訊
si.CreateDateTime = System.DateTime.Now;
workbook.SummaryInformation = si;
}
#endregion
ICellStyle dateStyle = workbook.CreateCellStyle();
IDataFormat format = workbook.CreateDataFormat();
dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");
// 取得列寬
int[] arrColWidth = GetWidth(dt);
int rowIndex = 0;
foreach (DataRow row in dt.Rows)
{
#region 新建表，填充表頭，填充列頭，樣式
if (rowIndex == 65535 || rowIndex == 0)
{
if (rowIndex != 0)
{
sheet = workbook.CreateSheet();
}
#region 表頭及樣式
{
IRow headerRow = sheet.CreateRow(0);
headerRow.HeightInPoints = 25;
headerRow.CreateCell(0).SetCellValue("NSD01");
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 NPOI.SS.Util.CellRangeAddress(0, 0, 0, dt.Columns.Count - 1));
}
#endregion
#region 列頭及樣式
{
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);
foreach (DataColumn column in dt.Columns)
{
headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
headerRow.GetCell(column.Ordinal).CellStyle = headStyle;
//設定列寬
sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal]) * 256);
}
}
#endregion
rowIndex = 2;
}
#endregion
#region 填充內容
IRow dataRow = sheet.CreateRow(rowIndex);
foreach (DataColumn column in dt.Columns)
{
ICell newCell = dataRow.CreateCell(column.Ordinal);
//newCell.SetCellValue(row[column].ToString());
string drValue = row[column].ToString();
switch (column.DataType.ToString())
{
case "System.String"://字串型別
newCell.SetCellValue(drValue);
break;
case "System.DateTime"://日期型別
System.DateTime dateV;
System.DateTime.TryParse(drValue, out dateV);
newCell.SetCellValue(dateV);
newCell.CellStyle = dateStyle;//格式化顯示
break;
case "System.Boolean"://布林型
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"://浮點型
case "System.Double":
double doubV = 0;
double.TryParse(drValue, out doubV);
newCell.SetCellValue(doubV);
break;
case "System.DBNull"://空值處理
newCell.SetCellValue("");
break;
default:
newCell.SetCellValue("");
break;
}
}
#endregion
rowIndex++;
}
string strFileName = CreateFile("Excel/" + DateTime.Now.ToString("yyyy-MM-dd"), DateTime.Now.ToString("MM-dd HHmm") + file, ".xls");
using (var fs = File.Create(strFileName))
{
workbook.Write(fs);
return "OK," + strFileName;
}
}
catch (Exception ex)
{
return "Fail:" + ex.Message;
throw;
}
}
/// <summary>
/// 保存文件XLS (多sheet)
/// </summary>
/// <param name="dt"></param>
/// <param name="file"></param>
public static string TableToExcelForXLSNoHead(DataTable dt, string file)
{
try
{
HSSFWorkbook workbook = new HSSFWorkbook();
ISheet sheet = workbook.CreateSheet();
//cell設置文字居中
ICellStyle newCellStyle = workbook.CreateCellStyle();
newCellStyle.Alignment = HorizontalAlignment.Center;
//取得列寬
int[] arrColWidth = GetWidth(dt);
int rowIndex = 0;
foreach (DataRow dataRow in dt.Rows)
{
#region 新建表，填充表頭，填充列頭，樣式
if (rowIndex == 65535 || rowIndex == 0)
{
if (rowIndex != 0)
{
sheet = workbook.CreateSheet();
}
#region 列頭及樣式
{
IRow headerRow = sheet.CreateRow(0);
ICellStyle headStyle = workbook.CreateCellStyle();
headStyle.Alignment = HorizontalAlignment.Center;//文字排版設置:居中
//字體加粗設置
IFont font = workbook.CreateFont();
font.FontHeightInPoints = 10;
font.Boldweight = 700;
headStyle.SetFont(font);
foreach (DataColumn column in dt.Columns)
{
headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
//ICell cell = row.CreateCell(i);
//cell.SetCellValue(dt.Columns[i].ColumnName);
headerRow.GetCell(column.Ordinal).CellStyle = headStyle;
//設定列寬
sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal]) * 256);
}
}
#endregion
rowIndex = 1;
}
#region 填充內容
{
IRow row1 = sheet.CreateRow(rowIndex);
foreach (DataColumn column in dt.Columns)
{
ICell newCell = row1.CreateCell(column.Ordinal);
newCell.SetCellValue(dataRow[column].ToString());
newCell.CellStyle = newCellStyle;
}
}
#endregion
rowIndex++;
#endregion
}
string strFileName = CreateFile("Excel/" + DateTime.Now.ToString("yyyy-MM-dd"), DateTime.Now.ToString("MM-dd HHmm") + file, ".xls");
using (var fs = File.Create(strFileName))
{
workbook.Write(fs);
return "OK," + strFileName;
}
}
catch (Exception ex)
{
return "Fail:" + ex.Message;
throw;
}
}
/// <summary>
/// 将DataTable数据导出到Excel文件中(xls) ,一張sheet65536 (多sheet,sheet有限制)
/// </summary>
/// <param name="dt"></param>
/// <param name="file"></param>
public static string TableToExcelForXLS(DataTable dt, string file)
{
try
{
HSSFWorkbook hssfworkbook = new HSSFWorkbook();
ISheet sheet = hssfworkbook.CreateSheet(file);
//表头
IRow row = sheet.CreateRow(0);
for (int i = 0; i < dt.Columns.Count; i++)
{
ICell cell = row.CreateCell(i);
cell.SetCellValue(dt.Columns[i].ColumnName);
}
//数据
//Auto(1, hssfworkbook, dt);
for (int i = 0; i < dt.Rows.Count; i++)
{
if (i < 65535)
{
IRow row1 = sheet.CreateRow(i + 1);
for (int j = 0; j < dt.Columns.Count; j++)
{
ICell cell = row1.CreateCell(j);
cell.SetCellValue(dt.Rows[i][j].ToString());
}
}
else
{
Auto(i, hssfworkbook, dt);
break;
}
}
if (!Directory.Exists(ConfigurationSettings.AppSettings["PATH"]))
{
Directory.CreateDirectory(ConfigurationSettings.AppSettings["PATH"]);
}
string strFileName = ConfigurationSettings.AppSettings["PATH"] + DateTime.Now.ToString("yyyy-MM-dd-24hhmm") + file + ".xls";
using (var fs = File.Create(strFileName))
{
hssfworkbook.Write(fs);
return "OK," + strFileName;
}
}
catch (Exception ex)
{
return "Fail:" + ex.Message;
throw;
}
}
/// <summary>
/// 自動分頁sheet
/// </summary>
/// <param name="i"></param>
/// <param name="hssfworkbook"></param>
/// <param name="dt"></param>
private static void Auto(int i, HSSFWorkbook hssfworkbook, DataTable dt)
{
//object[] str = new object[] { "sheet1", "sheet2", "sheet3" };
//ISheet[] obj = new ISheet[] { (ISheet)str[0] };
ISheet[] arrayA = new ISheet[10];
for (int k = 1; k <= dt.Rows.Count / 65536; k++, i++)
{
arrayA[k] = hssfworkbook.CreateSheet("sheet" + k.ToString());
for (; i < dt.Rows.Count; i++)
{
IRow row1 = arrayA[k].CreateRow(i - (65536 * k - 1));
//IRow row1 = arrayA[k].CreateRow(i - (65536 * k - 1 + y));
for (int j = 0; j < dt.Columns.Count; j++)
{
ICell cell = row1.CreateCell(j);
cell.SetCellValue(dt.Rows[i][j].ToString());
}
if (i - (65536 * k - 1) >= 65535)
{
break;
}
}
}
}
/// <summary>
/// 将DataTable数据导出到Excel文件中(xlsx)
/// </summary>
/// <param name="dt"></param>
/// <param name="file"></param>
public static string TableToExcelForXLSX(DataTable dt, string file)
{
XSSFWorkbook xssfworkbook = new XSSFWorkbook();
ISheet sheet = xssfworkbook.CreateSheet(file);
//表头
IRow row = sheet.CreateRow(0);
for (int i = 0; i < dt.Columns.Count; i++)
{
ICell cell = row.CreateCell(i);
cell.SetCellValue(dt.Columns[i].ColumnName);
}
//数据
for (int i = 0; i < dt.Rows.Count; i++)
{
IRow row1 = sheet.CreateRow(i + 1);
for (int j = 0; j < dt.Columns.Count; j++)
{
ICell cell = row1.CreateCell(j);
cell.SetCellValue(dt.Rows[i][j].ToString());
}
}
if (!Directory.Exists(ConfigurationSettings.AppSettings["PATH"]))
{
Directory.CreateDirectory(ConfigurationSettings.AppSettings["PATH"]);
}
string strFileName = ConfigurationSettings.AppSettings["PATH"] + DateTime.Now.ToString("yyyy-MM-dd") + file + ".xlsx";
using (var fs = File.Create(strFileName))
{
xssfworkbook.Write(fs);
//自动列宽
for (int i = 0; i <= dt.Columns.Count; i++)
{
sheet.AutoSizeColumn(i, true);
}
return "OK," + strFileName;
}
}
/// <summary>
/// 創建文件
/// </summary>
public static string CreateFile(string folder, string fileName, string fileExtension)
{
FileStream fs = null;
string filePath = folder + "/" + fileName + "." + fileExtension;
try
{
if (!Directory.Exists(folder))
{
Directory.CreateDirectory(folder);
}
fs = File.Create(filePath);
}
catch (Exception ex)
{
}
finally
{
if (fs != null)
{
fs.Dispose();
}
}
return filePath;
}
/// <summary>
/// 取得列寬
/// </summary>
/// <param name="dt"></param>
/// <returns></returns>
private static int[] GetWidth(DataTable dt)
{
#region 取得列寬
int[] arrColWidth = new int[dt.Columns.Count];
foreach (DataColumn item in dt.Columns)
{
arrColWidth[item.Ordinal] = Encoding.GetEncoding(936).GetBytes(item.ColumnName.ToString()).Length + 1;
}
for (int i = 0; i < dt.Rows.Count; i++)
{
for (int j = 0; j < dt.Columns.Count; j++)
{
int intTemp = Encoding.GetEncoding(936).GetBytes(dt.Rows[i][j].ToString()).Length + 1;
if (intTemp > arrColWidth[j])
{
arrColWidth[j] = intTemp;
}
}
}
return arrColWidth;
#endregion
}
/// <summary>
/// 保存文件CSV,數據本身不能帶有逗號，數據會亂
/// </summary>
/// <param name="dt"></param>
/// <param name="filePath"></param>
/// <returns></returns>
public static bool SaveDataToCSVFile(DataTable dt, string filePath)
{
bool successFlag = true;
StringBuilder strColumn = new StringBuilder();
StringBuilder strValue = new StringBuilder();
StreamWriter sw = null;
try
{
using (StreamWriter streamWriter = new StreamWriter(filePath, false, System.Text.Encoding.UTF8))
{
//表头
for (int i = 0; i < dt.Columns.Count; i++)
{
strColumn.Append(dt.Columns[i].ColumnName);
strColumn.Append(",");
}
strColumn.Remove(strColumn.Length - 1, 1);
streamWriter.WriteLine(strColumn); //write the column name
//數據
for (int i = 0; i < dt.Rows.Count; i++)
{
if (i < 1000000)
{
strValue.Remove(0, strValue.Length); //clear the temp row value
for (int j = 0; j < dt.Columns.Count; j++)
{
strValue.Append(dt.Rows[i][j].ToString());
strValue.Append(",");
}
strValue.Remove(strValue.Length - 1, 1);
streamWriter.WriteLine(strValue);//write the data
}
else
{
//Auto(i, hssfworkbook, dt);
break;
}
}
}
}
catch (Exception ex)
{
successFlag = false;
}
finally
{
if (sw != null)
{
sw.Dispose();
}
}
return successFlag;
}
}
}
类似资料：