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C# NPOI导出Excel横向纵向显示
/// <summary>
/// DataTable导出Excel(纵向导出)
/// </summary>
/// <param name="dataTable">数据源</param>
/// <param name="filePath">保存的路径</param>
/// <param name="documentname">表名</param>
public static void Excel2(this DataTable dataTable, string filePath, string documentname)
{
string sheetName = "Sheet1";
if (dataTable == null || dataTable.Rows.Count == 0)
throw new Exception("No data to export");
ISheet sheet = null;
IWorkbook workbook = null;
try
{
if (Directory.Exists(filePath) == false)
{
Directory.CreateDirectory(filePath);
}
string filedocmentname = "\\File Card.xls";//文件名
using (FileStream fs = new FileStream(filePath + filedocmentname, FileMode.Create, FileAccess.Write))
{
workbook = new HSSFWorkbook();
if (string.IsNullOrEmpty(sheetName))
sheetName = "Sheet1";//工作簿
sheet = workbook.CreateSheet(sheetName);
IRow row = sheet.CreateRow(0);
IFont font = workbook.CreateFont();
font.FontName = "Arial";//字体样式
font.Boldweight = (short)FontBoldWeight.Bold;
ICellStyle headerStyle2 = workbook.CreateCellStyle();
headerStyle2.VerticalAlignment = VerticalAlignment.Center; //垂直居中
headerStyle2.WrapText = true;//自动换行
font.FontHeightInPoints = 9;//字体
for (int i = 0; i < dataTable.Columns.Count; i++)
{
ICellStyle header= workbook.CreateCellStyle();
header.VerticalAlignment = VerticalAlignment.Center; //垂直居中
header.WrapText = true;//自动换行
var row1_ = sheet.CreateRow(i);//创建行
var cellName = row1_.CreateCell(0);//列名
cellName.SetCellValue(dataTable.Columns[i].ColumnName.ToString().Replace("<br />", "\n"));
IFont font2 = workbook.CreateFont();
font2.Boldweight = (short)FontBoldWeight.Bold;
header.SetFont(font);
cellName.CellStyle = header;
//填充内容
for (int j = 0; j < dataTable.Rows.Count; j++)
{
var cell1_ = row1_.CreateCell(j + 1);
cell1_.SetCellValue(dataTable.Rows[j][i].ToString().Replace("<br />", "\n"));
cell1_.CellStyle = headerStyle2; //把样式赋给单元格
}
}
//设置列宽
sheet.SetColumnWidth(0, 10 * 256+200);//列宽为10
//设置行高
//row.Height = 30 * 20;//行高为30
workbook.Write(fs); //写入到excel
}
}
finally
{
if (workbook != null)
workbook.Clear();
}
}
/// <summary> /// DataTable导出Excel(横向导出) /// </summary> /// <param name="dataTable">数据源</param> /// <param name="filePath">保存的路径</param> /// <param name="documentname">表名</param> public static void Excel(this DataTable dataTable, string filePath, string documentname) { //datatable第一列增加序号 dataTable= AddSeriNumToDataTable(dataTable); string sheetName = "Sheet1"; if (dataTable == null || dataTable.Rows.Count == 0) throw new Exception("No data to export"); ISheet sheet = null; IWorkbook workbook = null; try { if (Directory.Exists(filePath) == false) { Directory.CreateDirectory(filePath); } string filedocmentname = "\\List.xls";//文件名 using (FileStream fs = new FileStream(filePath + filedocmentname, FileMode.Create, FileAccess.Write)) { workbook = new HSSFWorkbook(); if (string.IsNullOrEmpty(sheetName)) sheetName = "Sheet1"; sheet = workbook.CreateSheet(sheetName); IRow row = sheet.CreateRow(0); IFont font = workbook.CreateFont(); font.FontName = "Arial";//字体样式 ICellStyle headerStyle2 = workbook.CreateCellStyle(); headerStyle2.VerticalAlignment = VerticalAlignment.Center; //垂直居中 headerStyle2.WrapText = true;//自动换行 font.FontHeightInPoints = 9;//字体 //填充表头 for (int columnIndex = 0; columnIndex < dataTable.Columns.Count; columnIndex++) { ICellStyle headerStyle = workbook.CreateCellStyle(); headerStyle.FillForegroundColor = IndexedColors.PaleBlue.Index;//首行填充颜色 headerStyle.FillPattern = FillPattern.SolidForeground; headerStyle.VerticalAlignment = VerticalAlignment.Center; //垂直居中 headerStyle.WrapText = true;//自动换行 headerStyle.BorderTop = BorderStyle.Thin;//上边框 headerStyle.BorderBottom = BorderStyle.Thin;//下边框 headerStyle.BorderLeft = BorderStyle.Thin;//左边框 headerStyle.BorderRight = BorderStyle.Thin;//右边框 var cell = row.CreateCell(columnIndex); cell.CellStyle = headerStyle; cell.SetCellValue(dataTable.Columns[columnIndex].ColumnName.Replace("<br />", "\n")); //设置列名 row.HeightInPoints= 35; } //填充内容 for (int rowIndex = 0; rowIndex < dataTable.Rows.Count; rowIndex++) { row = sheet.CreateRow(rowIndex + 1); for (int columnIndex = 0; columnIndex < dataTable.Columns.Count; columnIndex++) { row.CreateCell(columnIndex).SetCellValue(Convert.ToString(dataTable.Rows[rowIndex][columnIndex])); ICell cellData = row.CreateCell(columnIndex); cellData.SetCellValue(dataTable.Rows[rowIndex][columnIndex].ToString().Replace("<br />", "\n")); cellData.CellStyle = headerStyle2; //把样式赋给单元格 } } sheet.CreateFreezePane(0, 1, 0, 1); //首行冻结 workbook.Write(fs); //写入到excel } } finally { if (workbook != null) workbook.Clear(); } }
/// <summary>
/// 在DataTable中添加一序号列，编号从1依次递增
/// </summary>
/// <param >DataTable</param>
/// <returns></returns>
public static DataTable AddSeriNumToDataTable(DataTable dt)
{
//需要返回的值
DataTable dtNew;
if (dt.Columns.IndexOf("序号") >= 0)
{
dtNew = dt;
}
else //添加一序号列,并且在第一列
{
int rowLength = dt.Rows.Count;
int colLength = dt.Columns.Count;
DataRow[] newRows = new DataRow[rowLength];
dtNew = new DataTable();
//在第一列添加“序号”列
dtNew.Columns.Add("序号");
for (int i = 0; i < colLength; i++)
{
dtNew.Columns.Add(dt.Columns[i].ColumnName);
//复制dt中的数据
for (int j = 0; j < rowLength; j++)
{
if (newRows[j] == null)
newRows[j] = dtNew.NewRow();
//将其他数据填充到第二列之后，因为第一列为新增的序号列
newRows[j][i + 1] = dt.Rows[j][i];
}
}
foreach (DataRow row in newRows)
{
dtNew.Rows.Add(row);
}
}
//对序号列填充，从1递增
for (int i = 0; i < dt.Rows.Count; i++)
{
dtNew.Rows[i]["序号"] = i + 1;
}
return dtNew;
}
/// <summary> /// Datatable导出Excel(无任何样式) /// </summary> /// <param >DataTable</param> /// <returns></returns> public static void ExportExcel(DataTable dataTable, string filePath, string documentname) { if (dataTable != null && dataTable.Rows.Count > 0) { HSSFWorkbook excelBook = new HSSFWorkbook(); ISheet sheet1 = excelBook.CreateSheet("Export Data"); IRow row1 = sheet1.CreateRow(0); //填充表头 for (int i = 0; i < dataTable.Columns.Count; i++) { row1.CreateCell(i).SetCellValue(dataTable.Columns[i].ColumnName); } //填充内容 for (int i = 0; i < dataTable.Rows.Count; i++) { IRow rowTemp = sheet1.CreateRow(i + 1); for (int j = 0; j < dataTable.Columns.Count; j++) { rowTemp.CreateCell(j).SetCellValue(string.Format("{0}", dataTable.Rows[i][j])); } } //保存 MemoryStream ms = new MemoryStream(); excelBook.Write(ms); if (Directory.Exists(filePath) == false) { Directory.CreateDirectory(filePath); } string filedocmentname = "\\List.xls"; using (FileStream fs = new FileStream(filePath + filedocmentname, FileMode.Create, FileAccess.Write)) { byte[] data = ms.ToArray(); fs.Write(data, 0, data.Length); fs.Flush(); } ms.Close(); ms.Dispose(); } }
纵向导出Excel效果图
横向导出Excel效果图
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